Panbiogeography of the Santa María Amajac area, Hidalgo, Mexico

array:23 ["pii" => "S1870345314730052" "issn" => "18703453" "doi" => "10.7550/rmb.44392" "estado" => "S300" "fechaPublicacion" => "2014-12-01" "aid" => "73005" "copyright" => "Universidad Nacional Autónoma de México" "copyrightAnyo" => "2014" "documento" => "article" "licencia" => "http://creativecommons.org/licenses/by-nc-nd/4.0/" "subdocumento" => "fla" "cita" => "Revista Mexicana de Biodiversidad. 2014;85:1228-34" "abierto" => array:3 [ "ES" => true "ES2" => true "LATM" => true ] "gratuito" => true "lecturas" => array:2 [ "total" => 1188 "formatos" => array:3 [ "EPUB" => 48 "HTML" => 729 "PDF" => 411 ] ] "itemSiguiente" => array:18 [ "pii" => "S1870345314730064" "issn" => "18703453" "doi" => "10.7550/rmb.43747" "estado" => "S300" "fechaPublicacion" => "2014-12-01" "aid" => "73006" "copyright" => "Universidad Nacional Autónoma de México" "documento" => "article" "licencia" => "http://creativecommons.org/licenses/by-nc-nd/4.0/" "subdocumento" => "fla" "cita" => "Revista Mexicana de Biodiversidad. 2014;85:1235-48" "abierto" => array:3 [ "ES" => true "ES2" => true "LATM" => true ] "gratuito" => true "lecturas" => array:2 [ "total" => 1465 "formatos" => array:3 [ "EPUB" => 31 "HTML" => 1043 "PDF" => 391 ] ] "es" => array:12 [ "idiomaDefecto" => true "titulo" => "Estatus actual de conservación de seis especies de peces dulceacuícolas de la península de Baja California, México" "tienePdf" => "es" "tieneTextoCompleto" => "es" "tieneResumen" => array:2 [ 0 => "es" 1 => "en" ] "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "1235" "paginaFinal" => "1248" ] ] "titulosAlternativos" => array:1 [ "en" => array:1 [ "titulo" => "Current conservation status of six freshwater fish species from the Baja California Peninsula, Mexico" ] ] "contieneResumen" => array:2 [ "es" => true "en" => true ] "contieneTextoCompleto" => array:1 [ "es" => true ] "contienePdf" => array:1 [ "es" => true ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig0020" "etiqueta" => "Figura 4" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr4.jpeg" "Alto" => 1168 "Ancho" => 972 "Tamanyo" => 158557 ] ] "descripcion" => array:1 [ "es" => "A) Registros de distribución históricos y actuales de Cyprinodon macularius y B) Gasterosteus aculeatus en la península de Baja California, México (ver Apéndice 2 para número de localidad y toponimia)." ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Gorgonio Ruiz-Campos, Faustino Camarena-Rosales, Adrián F. González-Acosta, Alejandro M. Maeda-Martinez, Francisco J. García de León, Alejandro Varela-Romero, Asunción Andreu-Soler" "autores" => array:7 [ 0 => array:2 [ "nombre" => "Gorgonio" "apellidos" => "Ruiz-Campos" ] 1 => array:2 [ "nombre" => "Faustino" "apellidos" => "Camarena-Rosales" ] 2 => array:2 [ "nombre" => "Adrián F." "apellidos" => "González-Acosta" ] 3 => array:2 [ "nombre" => "Alejandro M." "apellidos" => "Maeda-Martinez" ] 4 => array:2 [ "nombre" => "Francisco J." "apellidos" => "García de León" ] 5 => array:2 [ "nombre" => "Alejandro" "apellidos" => "Varela-Romero" ] 6 => array:2 [ "nombre" => "Asunción" "apellidos" => "Andreu-Soler" ] ] ] ] ] "idiomaDefecto" => "es" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1870345314730064?idApp=UINPBA00004N" "url" => "/18703453/0000008500000004/v1_201504220301/S1870345314730064/v1_201504220301/es/main.assets" ] "itemAnterior" => array:18 [ "pii" => "S1870345314730040" "issn" => "18703453" "doi" => "10.7550/rmb.43849" "estado" => "S300" "fechaPublicacion" => "2014-12-01" "aid" => "73004" "copyright" => "Universidad Nacional Autónoma de México" "documento" => "article" "licencia" => "http://creativecommons.org/licenses/by-nc-nd/4.0/" "subdocumento" => "fla" "cita" => "Revista Mexicana de Biodiversidad. 2014;85:1217-27" "abierto" => array:3 [ "ES" => true "ES2" => true "LATM" => true ] "gratuito" => true "lecturas" => array:2 [ "total" => 877 "formatos" => array:3 [ "EPUB" => 37 "HTML" => 593 "PDF" => 247 ] ] "en" => array:12 [ "idiomaDefecto" => true "titulo" => "The importance of riparian habitats for avian communities in a highly human-modified Neotropical landscape" "tienePdf" => "en" "tieneTextoCompleto" => "en" "tieneResumen" => array:2 [ 0 => "en" 1 => "es" ] "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "1217" "paginaFinal" => "1227" ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "La importancia de los hábitats riparios para las comunidades de aves en un paisaje neotropical altamente modificado por el ser humano" ] ] "contieneResumen" => array:2 [ "en" => true "es" => true ] "contieneTextoCompleto" => array:1 [ "en" => true ] "contienePdf" => array:1 [ "en" => true ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig0010" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 1685 "Ancho" => 972 "Tamanyo" => 87202 ] ] "descripcion" => array:1 [ "en" => "a) Estimated bird species richness for surveyed habitats. Comparisons of estimated bird species richness were performed using an abundance cut off point of n=198 (lesser total abundance recorded in riparian habitats). b) Bird abundances for surveyed habitats. Letters above values denote significant differences. Riparian= riparian habitats, grazing= cattle grazing lands, cropfield= crop fields, urban= urban areas." ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Moisés Elías Domínguez-López, Rubén Ortega-Álvarez" "autores" => array:2 [ 0 => array:2 [ "nombre" => "Moisés" "apellidos" => "Elías Domínguez-López" ] 1 => array:2 [ "nombre" => "Rubén" "apellidos" => "Ortega-Álvarez" ] ] ] ] ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1870345314730040?idApp=UINPBA00004N" "url" => "/18703453/0000008500000004/v1_201504220301/S1870345314730040/v1_201504220301/en/main.assets" ] "en" => array:19 [ "idiomaDefecto" => true "titulo" => "Panbiogeography of the Santa María Amajac area, Hidalgo, Mexico" "tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "1228" "paginaFinal" => "1234" ] ] "autores" => array:1 [ 0 => array:3 [ "autoresLista" => "Arturo Palma-Ramírez, Irene Goyenechea, Jesús M. Castillo-Cerón" "autores" => array:3 [ 0 => array:3 [ "nombre" => "Arturo" "apellidos" => "Palma-Ramírez" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "1" "identificador" => "aff0005" ] ] ] 1 => array:4 [ "nombre" => "Irene" "apellidos" => "Goyenechea" "email" => array:1 [ 0 => "ireneg28@gmail.com" ] "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "2" "identificador" => "aff0010" ] ] ] 2 => array:3 [ "nombre" => "Jesús M." "apellidos" => "Castillo-Cerón" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "3" "identificador" => "aff0015" ] ] ] ] "afiliaciones" => array:3 [ 0 => array:3 [ "entidad" => "Léxico Estratigráfico, Servicio Geológico Mexicano. Av. Mariano Jiménez 465, 78280 San Luis Potosí, San Luis Potosí, Mexico" "etiqueta" => "1" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Laboratorio de Sistemática Molecular, Universidad Autónoma del Estado de Hidalgo. Ciudad Universitaria, Carretera Pachuca Tulancingo s/n Km. 4.5, 42184 Mineral de la Reforma, Hidalgo, Mexico" "etiqueta" => "2" "identificador" => "aff0010" ] 2 => array:3 [ "entidad" => "Museo de Paleontología, Universidad Autónoma del Estado de Hidalgo. Ciudad Universitaria, Carretera Pachuca Tulancingo s/n Km. 4.5, 42184 Mineral de la Reforma, Hidalgo, Mexico" "etiqueta" => "3" "identificador" => "aff0015" ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Panbiogeografía del área de Santa María Amajac, Hidalgo, México" ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig0020" "etiqueta" => "Figure 28" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr4.jpeg" "Alto" => 1125 "Ancho" => 972 "Tamanyo" => 98633 ] ] "descripcion" => array:1 [ "en" => "Generalized tracks and nodes obtained. I, Western North American; II, Central North American; III, Eastern North American; IV, Mesoamerican; V, South American; a, b, c, and d, nodes located in California, Colorado, Santa María Amajac, and Guatemala, respectively." ] ] ] "textoCompleto" => "IntroductionTraditionally, panbiogeographic studies have had a neontological approach. The underestimation or exclusion of the fossil record in this research program has been pointed out by different authors (<a class="elsevierStyleCrossRef" href="#bib0085">Crisci and Morrone, 1992</a>; <a class="elsevierStyleCrossRef" href="#bib0070">Cox and Moore, 1993</a>). Nevertheless, <a class="elsevierStyleCrossRef" href="#bib0075">Craw et al. (1999)</a> mentioned that fossils are important in panbiogeography because they could extend the distributional area of taxa, and represent the minimal age of a group, which is not necessarily equivalent to the time of the phylogenetic origin of that group. This contrasts with the traditional dispersalist point of view, where biogeographic hypotheses are based upon the place of first occurrence of a group in the fossil record (<a class="elsevierStyleCrossRef" href="#bib0035">Candela and Morrone, 2003</a>). In Mexico, the fossil record is abundant and there are localities ranging from the Precambrian (541million years ago) to the Holocene (Recent). However, given the geological history of the country and the nature of the fossil record, some periods and environments are represented more frequently than others, and some biological groups are widely documented, while in others the information is scarce or absent (<a class="elsevierStyleCrossRef" href="#bib0025">Arroyo-Cabrales et al., 2008</a>). Lacustrine environments are distinct because their biota could be preserved in the fossil record (<a class="elsevierStyleCrossRef" href="#bib0025">Arroyo-Cabrales et al., 2008</a>). In Mexico, there is no marine<a name="p1229"></a> or terrestrial fossil record revealing the total biological richness of a specific place as a reference to understanding current diversity (<a class="elsevierStyleCrossRef" href="#bib0025">Arroyo-Cabrales et al., 2008</a>). The Santa María Amajac paleolake is located in the central part of Hidalgo, and the paleofauna has been the subject of several studies. Its fossils include plants, ostracods, gastropods, fishes, amphibians, and mammals, among other groups (<a class="elsevierStyleCrossRef" href="#bib0010">Aguilar and Ortiz, 2000</a>; <a class="elsevierStyleCrossRef" href="#bib0015">Aguilar et al., 2002</a>; <a class="elsevierStyleCrossRef" href="#bib0020">Aguilar-Aguilar and Contreras-Medina, 2003</a>; <a class="elsevierStyleCrossRef" href="#bib0170">Martínez-Becerra, 2003</a>; <a class="elsevierStyleCrossRef" href="#bib0145">Hernández-López, 2006</a>; <a class="elsevierStyleCrossRef" href="#bib0180">Martínez-Martínez and Velasco de León, 2006</a>; <a class="elsevierStyleCrossRef" href="#bib0115">Flores-Camargo et al., 2009</a>, <a class="elsevierStyleCrossRef" href="#bib0215">Palma-Ramírez, 2012</a>; <a class="elsevierStyleCrossRef" href="#bib0245">Zayas-Ocelotl, 2013</a>).The aim of this study was to determine distributional patterns of different taxa making up the paleobiota in the Santa María Amajac paleolake through a panbiogeographic approach. This work represents the first analysis of its kind in Mexico that uses a significant number of fossil taxa under a panbiogeographical approach. The panbiogeographic method was originally proposed by <a class="elsevierStyleCrossRef" href="#bib0090">Leon Croizat (1958)</a> with the statement “Earth and Life evolve together”, meaning that there is a correlated history among 3 factors working as one: space, time, and form (<a class="elsevierStyleCrossRef" href="#bib0185">Morrone, 2001</a>; <a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al., 2003</a>). Panbiogeography emphasizes the spatial or geographical dimension of biodiversity, which allows a better understanding of evolutionary patterns and processes (<a class="elsevierStyleCrossRef" href="#bib0075">Craw et al., 1999</a>). Also, it highlights the importance of geographical distribution in maps (<a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al., 2003</a>). This method identifies spatial homologies, which indicate the preexistence of ancestral biotas (<a class="elsevierStyleCrossRef" href="#bib0130">Grehan, 2001</a>), clarifying the interrelationships between biogeographic areas, and also recognizing transition zones (<a class="elsevierStyleCrossRef" href="#bib0225">Ruggiero and Ezcurra, 2003</a>).Panbiogeography allows the possibility of recognizing whether certain areas have a complex origin (<a class="elsevierStyleCrossRef" href="#bib0185">Morrone, 2001</a>), suggesting localities for future cladistic biogeographic analyses (<a class="elsevierStyleCrossRef" href="#bib0060">Contreras-Medina and Eliosa-León, 2001</a>). Additionally, this method is especially useful in paleontology, where phylogenetic data of most of the groups is dubious or even incomplete (<a class="elsevierStyleCrossRef" href="#bib0125">Gallo et al., 2013</a>).Materials and methodsAn exhaustive search for fossil distributional records in America from the taxa identified in the area of Santa María Amajac was conducted. The data analyzed corresponded to the ages determined according to the chronology based on the presence of North American land mammals (NALMA), proposed by different authors (<a class="elsevierStyleCrossRef" href="#bib0055">Castillo-Cerón et al., 1996</a>; <a class="elsevierStyleCrossRef" href="#bib0045">Carranza-Castañeda, 2006</a>; <a class="elsevierStyleCrossRef" href="#bib0215">Palma-Ramírez, 2012</a>): Blancan (Late Pliocene), Irvingtonian (Late Pliocene- Early Pleistocene), and Rancholabrean (Late Pleistocene). Geographic distributions were obtained from the literature (<a class="elsevierStyleCrossRef" href="#bib0150">Kurtén and Anderson, 1980</a>; <a class="elsevierStyleCrossRef" href="#bib0040">Carranza-Castañeda, 1991</a>; <a class="elsevierStyleCrossRef" href="#bib0055">Castillo-Cerón et al., 1996</a>; <a class="elsevierStyleCrossRef" href="#bib0095">Edmund, 1996</a>), and supplemented by the available records of online databases of several scientific institutions, as well as the website: The Paleobiology Database (<a href="http://www.paleodb.org/cgi-bin/bridge.pl">http://www.paleodb.org/cgi-bin/bridge.pl</a>). Taxa were used at the taxonomic level of genus, as in many cases a specific identification was not possible. If fossils were considered at the specific level, the number of records gathered would diminish considerably.Track analysis. Panbiogeography involves 3 principal concepts: individual track, generalized or standard track, and node (<a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al., 2003</a>). An individual track represents the spatial coordinates of a species or group of related species in space (Liria, 1999; <a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al., 2003</a>). Operationally, individual tracks are line graphs drawn on a map of connected localities or distributional areas, according to geographical proximity (<a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al., 2003</a>). Spatially congruent individual tracks of unrelated taxa constitute a generalized track, which provides a spatial criterion for biogeographic homology (<a class="elsevierStyleCrossRef" href="#bib0210">Morrone and Crisci, 1995</a>), and suggest shared histories within biotas (<a class="elsevierStyleCrossRef" href="#bib0240">Torres-Miranda and Luna-Vega, 2006</a>). When 2 or more generalized tracks converge or overlap in an area, a biogeographic node is identified. A node is considered a complex area. This means that different ancestral biotic and geologic fragments interrelate in spacetime, as a consequence of terrane collision, docking, or suturing (<a class="elsevierStyleCrossRef" href="#bib0210">Morrone and Crisci, 1995</a>). Nodes are dynamic biogeographic boundaries where remnant fragments of different ancestral biotas came into contact (<a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al., 2003</a>). In this work, we constructed individual tracks for those taxa distributed in the Amajac paleolake (<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>): 12 plants (11 terrestrial and 1 aquatic), 3 ostracods, 1 gastropod, 2 amphibians, and 9 mammals. Individual tracks were obtained by plotting localities of each taxon on present-day American continent maps, employing ArcView 3.3 software (<a class="elsevierStyleCrossRef" href="#bib0110">ESRI, 2002</a>), and connecting them by minimum spanning trees using the Trazos2004 extension (<a class="elsevierStyleCrossRef" href="#bib0220">Rojas-Parra, 2004</a>). Generalized tracks and biogeographic nodes were drawn by hand. Due to the scale used in this research, individual tracks were not oriented, as has been done in other panbiogeographic studies (<a class="elsevierStyleCrossRef" href="#bib0190">Morrone, 2004</a>, <a class="elsevierStyleCrossRef" href="#bib0200">2009)</a>. Generalized tracks were obtained by superimposing the 27 individual tracks for each genus that correspond to the 27 genera included. Generalized tracks were outlined where 2 or more individual tracks overlap (<a class="elsevierStyleCrossRef" href="#bib0090">Croizat, 1958</a>; <a class="elsevierStyleCrossRef" href="#bib0130">Grehan, 2001</a>; <a class="elsevierStyleCrossRef" href="#bib0190">Morrone, 2004</a>; <a class="elsevierStyleCrossRef" href="#bib0240">Torres-Miranda and Luna-Vega, 2006</a>). Once the generalized tracks were delimited, nodes were identified in places where 2 or more of these tracks converged.<a name="p1230"></a><elsevierMultimedia ident="tbl0005"></elsevierMultimedia>ResultsWe constructed 27 individual tracks for the analyzed taxa (<a class="elsevierStyleCrossRefs" href="#fig0005">Figures 1–27</a>). Overlapping of individual tracks allowed the identification of 5 generalized tracks and 4 nodes (<a class="elsevierStyleCrossRef" href="#fig0020">Figure 28</a>). Four of the generalized tracks are located in northern Mexico and northern and central North America. The fifth generalized track extends from southern Mexico to Central America, and southwestern South America. We list the taxa that support the 5 generalized tracks in <a class="elsevierStyleCrossRef" href="#tbl0010">table 2</a>. The Western North American generalized track (track I) extends from the northwestern United States to California, where it overlaps with one of the edges of the Central North American generalized track (track II); where the Western North American generalized track turns to Colorado, it reaches Mexico through the Sierra Madre Oriental, and reaches the east-central portion of the Mexican Transvolcanic Belt (MTB), where it overlaps with generalized tracks II, III, and IV. Both edges of the generalized track II overlie the generalized tracks I, III, and IV in the east-central portion of the MTB. One branch of the generalized track II, extends from southern California, and passes through the west coast of Mexico, while the other edge descends from the northeastern United States across the Gulf of Mexico. The Eastern North American generalized track (track III) comes from the central part of the United States, where it overlies one of the branches<a name="p1231"></a> of the generalized track I, and reaches the central part of Mexico overlapping with the generalized tracks I, II, and IV. The Mesoamerican generalized track (track IV) extends from the southeastern United States and descends to the west-central portion of the MTB; it moves to the east-central part of the MTB, where it overlaps with generalized tracks I, II, and III. Track IV runs to Central America, where it overlies the eastern edge of the South American generalized track (track V). The latter extends to the Andes, where it bifurcates to the Amazon basin on one side, and to the Andes mountain range on the other. We identified 4 nodes. The first is located in California, United States. The second is situated in the west-central United States, in Colorado. The third is located in the Santa María Amajac area, in Hidalgo, in the east-central MTB. The fourth is situated in Central America, in Guatemala.<elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><elsevierMultimedia ident="fig0020"></elsevierMultimedia><elsevierMultimedia ident="tbl0010"></elsevierMultimedia>DiscussionFour of the 5 generalized tracks retrieved by the analysis (<a class="elsevierStyleCrossRef" href="#fig0020">Figure 28</a>) display an east-west distribution pattern that agrees with a previous hypothesis of an Atlantic-Pacific division along the Isthmus of Tehuantepec (<a class="elsevierStyleCrossRef" href="#bib0065">Corona et al., 2007</a>; <a class="elsevierStyleCrossRef" href="#bib0105">Escalante et al., 2007</a>; and <a class="elsevierStyleCrossRef" href="#bib0155">León-Paniagua et al., 2007</a>). The fifth generalized track (South American) is the only generalized track that resembles the Great American Biotic Interchange between North and South America during the late Cenozoic, where 2 of the fossil mammals that support the track are Holarctic taxa, while Pampatherium mexicanum is a Neotropical taxon.The 5 generalized tracks retrieved by the analysis coincide partially with those proposed by <a class="elsevierStyleCrossRef" href="#bib0060">Contreras-Medina and Eliosa-León (2001)</a> for the distribution of extant gymnosperms, amphibians, reptiles, birds, mammals, and insects. The Western North American generalized track is congruent with the track that <a class="elsevierStyleCrossRef" href="#bib0175">Martínez-Martínez (2008)</a> recovered with fossil records of 3 genera of aquatic plants (Nymphaea, Scirpus, and Typha). This track extends from the western United States to the Santa María Amajac area, in western Mexico. The Mesoamerican generalized track has been retrieved before and partially coincides with the Southern Mesoamerican track proposed by <a class="elsevierStyleCrossRef" href="#bib0165">Márquez and Morrone (2003)</a> and with the Mesoamerican track proposed by <a class="elsevierStyleCrossRef" href="#bib0235">Toledo et al. (2007)</a>. The South American generalized track agrees in its Central American portion with the track proposed by <a class="elsevierStyleCrossRef" href="#bib0030">Asiain et al. (2010)</a> based on beetles, with the track proposed by <a class="elsevierStyleCrossRef" href="#bib0175">Martínez-Martínez (2008)</a> for aquatic plants, and with the track that <a class="elsevierStyleCrossRef" href="#bib0100">Escalante et al. (2011)</a> recovered with nematodes and rodents. The<a name="p1232"></a> latter coincides with the South American generalized track as well, but only as far as Colombia.One of the nodes retrieved by the analysis, overlapping tracks III and IV, is located within the Mexican Transition zone proposed by <a class="elsevierStyleCrossRef" href="#bib0135">Halffter (1978</a>, <a class="elsevierStyleCrossRef" href="#bib0140">1987)</a> and delimited by <a class="elsevierStyleCrossRef" href="#bib0195">Morrone (2006)</a> using the distribution of extant taxa. These authors proposed the Mexican Transition zone as an area where Nearctic and Neotropical elements from the southern United States, Mexico, and Central America overlap. Other authors (<a class="elsevierStyleCrossRef" href="#bib0005">Aguayo and Trápaga, 1996</a>; <a class="elsevierStyleCrossRef" href="#bib0240">Torres-Miranda and Luna-Vega, 2006</a>) have already recovered nodes in the MTB.The biogeographic affinity of the Mexican biota has been discussed previously from a paleontological viewpoint by <a class="elsevierStyleCrossRef" href="#bib0050">Carranza-Castañeda and Ferrusquía-Villafranca, (1978)</a> and <a class="elsevierStyleCrossRef" href="#bib0045">Carranza-Castañeda, (2006)</a>, as well as from a neontological perspective (<a class="elsevierStyleCrossRef" href="#bib0230">Rzedowski, 1978</a>; <a class="elsevierStyleCrossRef" href="#bib0060">Contreras-Medina and Eliosa-León, 2001</a>; <a class="elsevierStyleCrossRef" href="#bib0205">Morrone, 2010</a>). The generalized tracks identified in our analysis support the idea of a combined origin of the Mexican biota relating Laurasian and Gondwanan components in the central portion of the country. Mexico's topographic and geographical characteristics have promoted a great variety of ecosystems and one of the highest levels of biodiversity worldwide (<a class="elsevierStyleCrossRef" href="#bib0120">Flores-Villela and Gérez, 1989</a>). In the central portion of the country the ecological and geological diversity is shown along with evidence of the integration of different organisms, mainly mammals, from the Nearctic region with immigrants from South America. Tracks obtained with the fossil biota of Santa María Amajac resemble those discovered with extant biotas, suggesting that distribution patterns have prevailed since late Pliocene (Blancan), because Mexico's geological configuration experienced minimal changes in the last 2million years, and those changes shown in the central portion of the country are due to climatic variations more than geological modifications (<a class="elsevierStyleCrossRef" href="#bib0150">Kurtén and Anderson, 1980</a>)." "textoCompletoSecciones" => array:1 [ "secciones" => array:10 [ 0 => array:3 [ "identificador" => "xres479594" "titulo" => "Abstract" "secciones" => array:1 [ 0 => array:1 [ "identificador" => "abst0005" ] ] ] 1 => array:2 [ "identificador" => "xpalclavsec501913" "titulo" => "Key words" ] 2 => array:3 [ "identificador" => "xres479593" "titulo" => "Resumen" "secciones" => array:1 [ 0 => array:1 [ "identificador" => "abst0010" ] ] ] 3 => array:2 [ "identificador" => "xpalclavsec501914" "titulo" => "Palabras clave" ] 4 => array:2 [ "identificador" => "sec0005" "titulo" => "Introduction" ] 5 => array:2 [ "identificador" => "sec0010" "titulo" => "Materials and methods" ] 6 => array:2 [ "identificador" => "sec0015" "titulo" => "Results" ] 7 => array:2 [ "identificador" => "sec0020" "titulo" => "Discussion" ] 8 => array:2 [ "identificador" => "xack147157" "titulo" => "Acknowledgments" ] 9 => array:1 [ "titulo" => "Literature cited" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2014-02-07" "fechaAceptado" => "2014-06-05" "PalabrasClave" => array:2 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Key words" "identificador" => "xpalclavsec501913" "palabras" => array:6 [ 0 => "paleolake" 1 => "track analysis" 2 => "node" 3 => "birds" 4 => "mammals" 5 => "fossils" ] ] ] "es" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Palabras clave" "identificador" => "xpalclavsec501914" "palabras" => array:6 [ 0 => "paleolago" 1 => "análisis de trazos" 2 => "nodo" 3 => "aves" 4 => "mamíferos" 5 => "fósiles" ] ] ] ] "tieneResumen" => true "resumen" => array:2 [ "en" => array:2 [ "titulo" => "Abstract" "resumen" => "The Santa María Amajac paleolake is located in the central portion of Hidalgo, Mexico. Twenty-seven fossil taxa of aquatic and terrestrial plants, gastropods, ostracods, amphibians, and mammals identified previously in the area of the paleolake were selected and their distribution in America during the Late Pliocene- Pleistocene was analyzed using the panbiogeographic method. As a result of the overlap of 27 individual tracks, 5 generalized tracks were obtained: I) Western North American, II) Central North American, III) Eastern North American, IV) Mesoamerican, and V) South American. The generalized tracks are consistent with previous proposals for extant gymnosperms, amphibians, sauropsids, birds, mammals, aquatic plants, insects, beetles, and nematodes, suggesting that distribution patterns have prevailed since the late Pliocene (Blancan). Four biogeographic nodes were identified, 2 situated in North America, in California and Colorado, the third located in the Santa María Amajac area in central Mexico, and the fourth located in Central America." ] "es" => array:2 [ "titulo" => "Resumen" "resumen" => "El paleolago de Santa María Amajac se ubica en la parte central del estado de Hidalgo, México. Se seleccionaron 27 taxones fósiles pertenecientes a plantas acuáticas y terrestres, gasterópodos, ostrácodos, anfibios y mamíferos que habían sido previamente identificados en el área del paleolago, y se analizó su distribución en América durante el Plioceno Tardío-Pleistoceno a través del método panbiogeográfico. Como resultado de la superposición de los 27 trazos individuales se obtuvieron 5 trazos generalizados: I) norteamericano occidental, II) norteamericano central, III) norteamerciano oriental, IV) mesoamericano y V) sudamericano. Los trazos generalizados coinciden con los propuestos para gimnospermas, anfibios, saurópsidos, aves, mamíferos, plantas acuáticas, insectos, coleópteros y nemátodos recientes; lo que indica que los patrones de distribución han prevalecido desde el Plioceno tardío (Blancano). Se identificaron 4 nodos; 2 localizados en Estados Unidos de Norteamérica, en California y Colorado, otro localizado en el área de Santa María Amajac, en la parte central del país y el último en Centroamérica." ] ] "multimedia" => array:6 [ 0 => array:7 [ "identificador" => "fig0005" "etiqueta" => "Figures 1-9" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 879 "Ancho" => 972 "Tamanyo" => 111108 ] ] "descripcion" => array:1 [ "en" => "Individual tracks. 1, Amelanchier sp.; 2, Cercocarpus sp.; 3, Crataegus sp.; 4, Platanus sp.; 5, Prunus sp.; 6, Rhus sp.; 7, Salix sp.; 8, Populus sp.; 9, Candona sp." ] ] 1 => array:7 [ "identificador" => "fig0010" "etiqueta" => "Figures 10-18" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 851 "Ancho" => 972 "Tamanyo" => 117096 ] ] "descripcion" => array:1 [ "en" => "Individual tracks. 10, Hyla sp.; 11, Tremarctos sp.; 12, Limnocythere sp.; 13, Ambystoma sp.; 14, Juniperus sp.; 15, Typha sp.; 16, Planorbis sp., 17, Darwinula sp.; 18, Pinus sp." ] ] 2 => array:7 [ "identificador" => "fig0015" "etiqueta" => "Figures 19-27" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr3.jpeg" "Alto" => 905 "Ancho" => 973 "Tamanyo" => 122124 ] ] "descripcion" => array:1 [ "en" => "19, Quercus sp.; 20, Paramylodon sp.; 21, Mammuthus sp.; 22, Pampatherium sp.; 23, Cuvieronius sp.; 24, Sylvilagus sp.; 25, Equus sp.; 26, Platygonus sp.;27, Rhynchotherium sp." ] ] 3 => array:7 [ "identificador" => "fig0020" "etiqueta" => "Figure 28" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr4.jpeg" "Alto" => 1125 "Ancho" => 972 "Tamanyo" => 98633 ] ] "descripcion" => array:1 [ "en" => "Generalized tracks and nodes obtained. I, Western North American; II, Central North American; III, Eastern North American; IV, Mesoamerican; V, South American; a, b, c, and d, nodes located in California, Colorado, Santa María Amajac, and Guatemala, respectively." ] ] 4 => array:7 [ "identificador" => "tbl0005" "etiqueta" => "Table 1" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "tabla" => array:1 [ "tablatextoimagen" => array:1 [ 0 => array:2 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="table-head " align="left" valign="bottom" scope="col" style="border-bottom: 2px solid black">Taxa \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="center" valign="bottom" scope="col" style="border-bottom: 2px solid black">Genera \t\t\t\t\t\t\n \t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom">Terrestrial plants \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Amelanchier sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Cercocarpus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Crataegus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Juniperus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Pinus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Platanus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Populus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Prunus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Quercus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Rhus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Salix sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom">Aquatic plants \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Typha sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom">Gasteropods \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Planorbis sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom">Ostracods \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Candona sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Darwinula sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Limnocythere sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom">Amphibians \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Ambystoma sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Hyla sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom">Mammals \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Pampatherium sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Paramylodon sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Cuvieronius sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Mammuthus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Rhynchotherium sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Sylvilagus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Equus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Platygonus sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Tremarctos sp. \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] "imagenFichero" => array:1 [ 0 => "xTab758005.png" ] ] ] ] "descripcion" => array:1 [ "en" => "Taxa considered in the panbiogeographic analysis" ] ] 5 => array:7 [ "identificador" => "tbl0010" "etiqueta" => "Table 2" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "tabla" => array:1 [ "tablatextoimagen" => array:1 [ 0 => array:2 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="table-head " align="left" valign="bottom" scope="col" style="border-bottom: 2px solid black">Tracks \t\t\t\t\t\t\n \t\t\t\t</th><th class="td" title="table-head " align="center" valign="bottom" scope="col" style="border-bottom: 2px solid black">Genera \t\t\t\t\t\t\n \t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom">I \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Amelanchier, Cercocarpus, Crataegus, Platanus, Prunus, Rhus, Salix. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom">II \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Populus, Candona, Limnocythere, Ambystoma, Hyla, Tremarctos. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom">III \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Juniperus, Thypa Planorbis, Darwinula. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom">IV \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Pinus, Quercus, Paramylodon, Mammuthus. \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry " align="left" valign="bottom">V \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="table-entry " align="center" valign="bottom">Pampatherium, Cuvieronius, Sylvilagus, Equus, Platygonus. \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] "imagenFichero" => array:1 [ 0 => "xTab758006.png" ] ] ] ] "descripcion" => array:1 [ "en" => "Genera that support the generalized tracks identified" ] ] ] "bibliografia" => array:2 [ "titulo" => "Literature cited" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:49 [ 0 => array:3 [ "identificador" => "bib0005" "etiqueta" => "Aguayo and Trápaga, 1996" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:1 [ "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:2 [ 0 => "J.E. Aguayo" 1 => "R. Trápaga" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Libro" => array:5 [ "titulo" => "Geodinámica de México y minerales del mar" "fecha" => "1996" "paginaInicial" => "106" "editorial" => "Fondo de Cultura Económica" "editorialLocalizacion" => "México D.F" ] ] ] ] ] ] 1 => array:3 [ "identificador" => "bib0010" "etiqueta" => "Aguilar and Ortiz, 2000" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:1 [ "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:2 [ 0 => "F. Aguilar" 1 => "M.E. Ortiz" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Libro" => array:5 [ "titulo" => "Estudio paleoecológico de la flora pliocénica de Santa María Amajac, Hidalgo: Inferencia del paleoclima y de la paleocomunidad" "fecha" => "2000" "paginaInicial" => "79" "editorial" => "Bachelor's thesis Facultad de Ciencias, Universidad Nacional Autónoma de México" "editorialLocalizacion" => "México, D. 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Panbiogeografía del área de Santa María Amajac, Hidalgo, México

Arturo Palma-Ramírez1, Irene Goyenechea2, Jesús M. Castillo-Cerón3

1 Léxico Estratigráfico, Servicio Geológico Mexicano. Av. Mariano Jiménez 465, 78280 San Luis Potosí, San Luis Potosí, Mexico

2 Laboratorio de Sistemática Molecular, Universidad Autónoma del Estado de Hidalgo. Ciudad Universitaria, Carretera Pachuca Tulancingo s/n Km. 4.5, 42184 Mineral de la Reforma, Hidalgo, Mexico

3 Museo de Paleontología, Universidad Autónoma del Estado de Hidalgo. Ciudad Universitaria, Carretera Pachuca Tulancingo s/n Km. 4.5, 42184 Mineral de la Reforma, Hidalgo, Mexico

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          "en" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Generalized tracks and nodes obtained&#46; I&#44; Western North American&#59; II&#44; Central North American&#59; III&#44; Eastern North American&#59; IV&#44; Mesoamerican&#59; V&#44; South American&#59; a&#44; b&#44; c&#44; and d&#44; nodes located in California&#44; Colorado&#44; Santa Mar&#237;a Amajac&#44; and Guatemala&#44; respectively&#46;</p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Traditionally&#44; panbiogeographic studies have had a neontological approach&#46; The underestimation or exclusion of the fossil record in this research program has been pointed out by different authors &#40;<a class="elsevierStyleCrossRef" href="#bib0085">Crisci and Morrone&#44; 1992</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0070">Cox and Moore&#44; 1993</a>&#41;&#46; Nevertheless&#44; <a class="elsevierStyleCrossRef" href="#bib0075">Craw et al&#46; &#40;1999&#41;</a> mentioned that fossils are important in panbiogeography because they could extend the distributional area of taxa&#44; and represent the minimal age of a group&#44; which is not necessarily equivalent to the time of the phylogenetic origin of that group&#46; This contrasts with the traditional dispersalist point of view&#44; where biogeographic hypotheses are based upon the place of first occurrence of a group in the fossil record &#40;<a class="elsevierStyleCrossRef" href="#bib0035">Candela and Morrone&#44; 2003</a>&#41;&#46; In Mexico&#44; the fossil record is abundant and there are localities ranging from the Precambrian &#40;541<span class="elsevierStyleHsp" style=""></span>million years ago&#41; to the Holocene &#40;Recent&#41;&#46; However&#44; given the geological history of the country and the nature of the fossil record&#44; some periods and environments are represented more frequently than others&#44; and some biological groups are widely documented&#44; while in others the information is scarce or absent &#40;<a class="elsevierStyleCrossRef" href="#bib0025">Arroyo-Cabrales et al&#46;&#44; 2008</a>&#41;&#46; Lacustrine environments are distinct because their biota could be preserved in the fossil record &#40;<a class="elsevierStyleCrossRef" href="#bib0025">Arroyo-Cabrales et al&#46;&#44; 2008</a>&#41;&#46; In Mexico&#44; there is no marine<a name="p1229"></a> or terrestrial fossil record revealing the total biological richness of a specific place as a reference to understanding current diversity &#40;<a class="elsevierStyleCrossRef" href="#bib0025">Arroyo-Cabrales et al&#46;&#44; 2008</a>&#41;&#46; The Santa Mar&#237;a Amajac paleolake is located in the central part of Hidalgo&#44; and the paleofauna has been the subject of several studies&#46; Its fossils include plants&#44; ostracods&#44; gastropods&#44; fishes&#44; amphibians&#44; and mammals&#44; among other groups &#40;<a class="elsevierStyleCrossRef" href="#bib0010">Aguilar and Ortiz&#44; 2000</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0015">Aguilar et al&#46;&#44; 2002</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0020">Aguilar-Aguilar and Contreras-Medina&#44; 2003</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0170">Mart&#237;nez-Becerra&#44; 2003</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0145">Hern&#225;ndez-L&#243;pez&#44; 2006</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0180">Mart&#237;nez-Mart&#237;nez and Velasco de Le&#243;n&#44; 2006</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0115">Flores-Camargo et al&#46;&#44; 2009</a>&#44; <a class="elsevierStyleCrossRef" href="#bib0215">Palma-Ram&#237;rez&#44; 2012</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0245">Zayas-Ocelotl&#44; 2013</a>&#41;&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">The aim of this study was to determine distributional patterns of different taxa making up the paleobiota in the Santa Mar&#237;a Amajac paleolake through a panbiogeographic approach&#46; This work represents the first analysis of its kind in Mexico that uses a significant number of fossil taxa under a panbiogeographical approach&#46; The panbiogeographic method was originally proposed by <a class="elsevierStyleCrossRef" href="#bib0090">Leon Croizat &#40;1958&#41;</a> with the statement &#8220;Earth and Life evolve together&#8221;&#44; meaning that there is a correlated history among 3 factors working as one&#58; space&#44; time&#44; and form &#40;<a class="elsevierStyleCrossRef" href="#bib0185">Morrone&#44; 2001</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al&#46;&#44; 2003</a>&#41;&#46; Panbiogeography emphasizes the spatial or geographical dimension of biodiversity&#44; which allows a better understanding of evolutionary patterns and processes &#40;<a class="elsevierStyleCrossRef" href="#bib0075">Craw et al&#46;&#44; 1999</a>&#41;&#46; Also&#44; it highlights the importance of geographical distribution in maps &#40;<a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al&#46;&#44; 2003</a>&#41;&#46; This method identifies spatial homologies&#44; which indicate the preexistence of ancestral biotas &#40;<a class="elsevierStyleCrossRef" href="#bib0130">Grehan&#44; 2001</a>&#41;&#44; clarifying the interrelationships between biogeographic areas&#44; and also recognizing transition zones &#40;<a class="elsevierStyleCrossRef" href="#bib0225">Ruggiero and Ezcurra&#44; 2003</a>&#41;&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Panbiogeography allows the possibility of recognizing whether certain areas have a complex origin &#40;<a class="elsevierStyleCrossRef" href="#bib0185">Morrone&#44; 2001</a>&#41;&#44; suggesting localities for future cladistic biogeographic analyses &#40;<a class="elsevierStyleCrossRef" href="#bib0060">Contreras-Medina and Eliosa-Le&#243;n&#44; 2001</a>&#41;&#46; Additionally&#44; this method is especially useful in paleontology&#44; where phylogenetic data of most of the groups is dubious or even incomplete &#40;<a class="elsevierStyleCrossRef" href="#bib0125">Gallo et al&#46;&#44; 2013</a>&#41;&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Materials and methods</span><p id="par0020" class="elsevierStylePara elsevierViewall">An exhaustive search for fossil distributional records in America from the taxa identified in the area of Santa Mar&#237;a Amajac was conducted&#46; The data analyzed corresponded to the ages determined according to the chronology based on the presence of North American land mammals &#40;NALMA&#41;&#44; proposed by different authors &#40;<a class="elsevierStyleCrossRef" href="#bib0055">Castillo-Cer&#243;n et al&#46;&#44; 1996</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0045">Carranza-Casta&#241;eda&#44; 2006</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0215">Palma-Ram&#237;rez&#44; 2012</a>&#41;&#58; Blancan &#40;Late Pliocene&#41;&#44; Irvingtonian &#40;Late Pliocene- Early Pleistocene&#41;&#44; and Rancholabrean &#40;Late Pleistocene&#41;&#46; Geographic distributions were obtained from the literature &#40;<a class="elsevierStyleCrossRef" href="#bib0150">Kurt&#233;n and Anderson&#44; 1980</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0040">Carranza-Casta&#241;eda&#44; 1991</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0055">Castillo-Cer&#243;n et al&#46;&#44; 1996</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0095">Edmund&#44; 1996</a>&#41;&#44; and supplemented by the available records of online databases of several scientific institutions&#44; as well as the website&#58; The Paleobiology Database &#40;<a href="http://www.paleodb.org/cgi-bin/bridge.pl">http&#58;&#47;&#47;www&#46;paleodb&#46;org&#47;cgi-bin&#47;bridge&#46;pl</a>&#41;&#46; Taxa were used at the taxonomic level of genus&#44; as in many cases a specific identification was not possible&#46; If fossils were considered at the specific level&#44; the number of records gathered would diminish considerably&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Track analysis</span>&#46; Panbiogeography involves 3 principal concepts&#58; individual track&#44; generalized or standard track&#44; and node &#40;<a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al&#46;&#44; 2003</a>&#41;&#46; An individual track represents the spatial coordinates of a species or group of related species in space &#40;Liria&#44; 1999&#59; <a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al&#46;&#44; 2003</a>&#41;&#46; Operationally&#44; individual tracks are line graphs drawn on a map of connected localities or distributional areas&#44; according to geographical proximity &#40;<a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al&#46;&#44; 2003</a>&#41;&#46; Spatially congruent individual tracks of unrelated taxa constitute a generalized track&#44; which provides a spatial criterion for biogeographic homology &#40;<a class="elsevierStyleCrossRef" href="#bib0210">Morrone and Crisci&#44; 1995</a>&#41;&#44; and suggest shared histories within biotas &#40;<a class="elsevierStyleCrossRef" href="#bib0240">Torres-Miranda and Luna-Vega&#44; 2006</a>&#41;&#46; When 2 or more generalized tracks converge or overlap in an area&#44; a biogeographic node is identified&#46; A node is considered a complex area&#46; This means that different ancestral biotic and geologic fragments interrelate in spacetime&#44; as a consequence of terrane collision&#44; docking&#44; or suturing &#40;<a class="elsevierStyleCrossRef" href="#bib0210">Morrone and Crisci&#44; 1995</a>&#41;&#46; Nodes are dynamic biogeographic boundaries where remnant fragments of different ancestral biotas came into contact &#40;<a class="elsevierStyleCrossRef" href="#bib0080">Crisci et al&#46;&#44; 2003</a>&#41;&#46; In this work&#44; we constructed individual tracks for those taxa distributed in the Amajac paleolake &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#58; 12 plants &#40;11 terrestrial and 1 aquatic&#41;&#44; 3 ostracods&#44; 1 gastropod&#44; 2 amphibians&#44; and 9 mammals&#46; Individual tracks were obtained by plotting localities of each taxon on present-day American continent maps&#44; employing ArcView 3&#46;3 software &#40;<a class="elsevierStyleCrossRef" href="#bib0110">ESRI&#44; 2002</a>&#41;&#44; and connecting them by minimum spanning trees using the Trazos2004 extension &#40;<a class="elsevierStyleCrossRef" href="#bib0220">Rojas-Parra&#44; 2004</a>&#41;&#46; Generalized tracks and biogeographic nodes were drawn by hand&#46; Due to the scale used in this research&#44; individual tracks were not oriented&#44; as has been done in other panbiogeographic studies &#40;<a class="elsevierStyleCrossRef" href="#bib0190">Morrone&#44; 2004</a>&#44; <a class="elsevierStyleCrossRef" href="#bib0200">2009&#41;</a>&#46; Generalized tracks were obtained by superimposing the 27 individual tracks for each genus that correspond to the 27 genera included&#46; Generalized tracks were outlined where 2 or more individual tracks overlap &#40;<a class="elsevierStyleCrossRef" href="#bib0090">Croizat&#44; 1958</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0130">Grehan&#44; 2001</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0190">Morrone&#44; 2004</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0240">Torres-Miranda and Luna-Vega&#44; 2006</a>&#41;&#46; Once the generalized tracks were delimited&#44; nodes were identified in places where 2 or more of these tracks converged&#46;<a name="p1230"></a></p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Results</span><p id="par0030" class="elsevierStylePara elsevierViewall">We constructed 27 individual tracks for the analyzed taxa &#40;<a class="elsevierStyleCrossRefs" href="#fig0005">Figures 1&#8211;27</a>&#41;&#46; Overlapping of individual tracks allowed the identification of 5 generalized tracks and 4 nodes &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Figure 28</a>&#41;&#46; Four of the generalized tracks are located in northern Mexico and northern and central North America&#46; The fifth generalized track extends from southern Mexico to Central America&#44; and southwestern South America&#46; We list the taxa that support the 5 generalized tracks in <a class="elsevierStyleCrossRef" href="#tbl0010">table 2</a>&#46; The Western North American generalized track &#40;track I&#41; extends from the northwestern United States to California&#44; where it overlaps with one of the edges of the Central North American generalized track &#40;track II&#41;&#59; where the Western North American generalized track turns to Colorado&#44; it reaches Mexico through the Sierra Madre Oriental&#44; and reaches the east-central portion of the Mexican Transvolcanic Belt &#40;MTB&#41;&#44; where it overlaps with generalized tracks II&#44; III&#44; and IV&#46; Both edges of the generalized track II overlie the generalized tracks I&#44; III&#44; and IV in the east-central portion of the MTB&#46; One branch of the generalized track II&#44; extends from southern California&#44; and passes through the west coast of Mexico&#44; while the other edge descends from the northeastern United States across the Gulf of Mexico&#46; The Eastern North American generalized track &#40;track III&#41; comes from the central part of the United States&#44; where it overlies one of the branches<a name="p1231"></a> of the generalized track I&#44; and reaches the central part of Mexico overlapping with the generalized tracks I&#44; II&#44; and IV&#46; The Mesoamerican generalized track &#40;track IV&#41; extends from the southeastern United States and descends to the west-central portion of the MTB&#59; it moves to the east-central part of the MTB&#44; where it overlaps with generalized tracks I&#44; II&#44; and III&#46; Track IV runs to Central America&#44; where it overlies the eastern edge of the South American generalized track &#40;track V&#41;&#46; The latter extends to the Andes&#44; where it bifurcates to the Amazon basin on one side&#44; and to the Andes mountain range on the other&#46; We identified 4 nodes&#46; The first is located in California&#44; United States&#46; The second is situated in the west-central United States&#44; in Colorado&#46; The third is located in the Santa Mar&#237;a Amajac area&#44; in Hidalgo&#44; in the east-central MTB&#46; The fourth is situated in Central America&#44; in Guatemala&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><elsevierMultimedia ident="fig0020"></elsevierMultimedia><elsevierMultimedia ident="tbl0010"></elsevierMultimedia></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Discussion</span><p id="par0035" class="elsevierStylePara elsevierViewall">Four of the 5 generalized tracks retrieved by the analysis &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Figure 28</a>&#41; display an east-west distribution pattern that agrees with a previous hypothesis of an Atlantic-Pacific division along the Isthmus of Tehuantepec &#40;<a class="elsevierStyleCrossRef" href="#bib0065">Corona et al&#46;&#44; 2007</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0105">Escalante et al&#46;&#44; 2007</a>&#59; and <a class="elsevierStyleCrossRef" href="#bib0155">Le&#243;n-Paniagua et al&#46;&#44; 2007</a>&#41;&#46; The fifth generalized track &#40;South American&#41; is the only generalized track that resembles the Great American Biotic Interchange between North and South America during the late Cenozoic&#44; where 2 of the fossil mammals that support the track are Holarctic taxa&#44; while <span class="elsevierStyleItalic">Pampatherium mexicanum</span> is a Neotropical taxon&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">The 5 generalized tracks retrieved by the analysis coincide partially with those proposed by <a class="elsevierStyleCrossRef" href="#bib0060">Contreras-Medina and Eliosa-Le&#243;n &#40;2001&#41;</a> for the distribution of extant gymnosperms&#44; amphibians&#44; reptiles&#44; birds&#44; mammals&#44; and insects&#46; The Western North American generalized track is congruent with the track that <a class="elsevierStyleCrossRef" href="#bib0175">Mart&#237;nez-Mart&#237;nez &#40;2008&#41;</a> recovered with fossil records of 3 genera of aquatic plants <span class="elsevierStyleItalic">&#40;Nymphaea&#44; Scirpus</span>&#44; and <span class="elsevierStyleItalic">Typha</span>&#41;&#46; This track extends from the western United States to the Santa Mar&#237;a Amajac area&#44; in western Mexico&#46; The Mesoamerican generalized track has been retrieved before and partially coincides with the Southern Mesoamerican track proposed by <a class="elsevierStyleCrossRef" href="#bib0165">M&#225;rquez and Morrone &#40;2003&#41;</a> and with the Mesoamerican track proposed by <a class="elsevierStyleCrossRef" href="#bib0235">Toledo et al&#46; &#40;2007&#41;</a>&#46; The South American generalized track agrees in its Central American portion with the track proposed by <a class="elsevierStyleCrossRef" href="#bib0030">Asiain et al&#46; &#40;2010&#41;</a> based on beetles&#44; with the track proposed by <a class="elsevierStyleCrossRef" href="#bib0175">Mart&#237;nez-Mart&#237;nez &#40;2008&#41;</a> for aquatic plants&#44; and with the track that <a class="elsevierStyleCrossRef" href="#bib0100">Escalante et al&#46; &#40;2011&#41;</a> recovered with nematodes and rodents&#46; The<a name="p1232"></a> latter coincides with the South American generalized track as well&#44; but only as far as Colombia&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">One of the nodes retrieved by the analysis&#44; overlapping tracks III and IV&#44; is located within the Mexican Transition zone proposed by <a class="elsevierStyleCrossRef" href="#bib0135">Halffter &#40;1978</a>&#44; <a class="elsevierStyleCrossRef" href="#bib0140">1987&#41;</a> and delimited by <a class="elsevierStyleCrossRef" href="#bib0195">Morrone &#40;2006&#41;</a> using the distribution of extant taxa&#46; These authors proposed the Mexican Transition zone as an area where Nearctic and Neotropical elements from the southern United States&#44; Mexico&#44; and Central America overlap&#46; Other authors &#40;<a class="elsevierStyleCrossRef" href="#bib0005">Aguayo and Tr&#225;paga&#44; 1996</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0240">Torres-Miranda and Luna-Vega&#44; 2006</a>&#41; have already recovered nodes in the MTB&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">The biogeographic affinity of the Mexican biota has been discussed previously from a paleontological viewpoint by <a class="elsevierStyleCrossRef" href="#bib0050">Carranza-Casta&#241;eda and Ferrusqu&#237;a-Villafranca&#44; &#40;1978&#41;</a> and <a class="elsevierStyleCrossRef" href="#bib0045">Carranza-Casta&#241;eda&#44; &#40;2006&#41;</a>&#44; as well as from a neontological perspective &#40;<a class="elsevierStyleCrossRef" href="#bib0230">Rzedowski&#44; 1978</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0060">Contreras-Medina and Eliosa-Le&#243;n&#44; 2001</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0205">Morrone&#44; 2010</a>&#41;&#46; The generalized tracks identified in our analysis support the idea of a combined origin of the Mexican biota relating Laurasian and Gondwanan components in the central portion of the country&#46; Mexico&#39;s topographic and geographical characteristics have promoted a great variety of ecosystems and one of the highest levels of biodiversity worldwide &#40;<a class="elsevierStyleCrossRef" href="#bib0120">Flores-Villela and G&#233;rez&#44; 1989</a>&#41;&#46; In the central portion of the country the ecological and geological diversity is shown along with evidence of the integration of different organisms&#44; mainly mammals&#44; from the Nearctic region with immigrants from South America&#46; Tracks obtained with the fossil biota of Santa Mar&#237;a Amajac resemble those discovered with extant biotas&#44; suggesting that distribution patterns have prevailed since late Pliocene &#40;Blancan&#41;&#44; because Mexico&#39;s geological configuration experienced minimal changes in the last 2<span class="elsevierStyleHsp" style=""></span>million years&#44; and those changes shown in the central portion of the country are due to climatic variations more than geological modifications &#40;<a class="elsevierStyleCrossRef" href="#bib0150">Kurt&#233;n and Anderson&#44; 1980</a>&#41;&#46;</p></span></span>"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">The Santa Mar&#237;a Amajac paleolake is located in the central portion of Hidalgo&#44; Mexico&#46; Twenty-seven fossil taxa of aquatic and terrestrial plants&#44; gastropods&#44; ostracods&#44; amphibians&#44; and mammals identified previously in the area of the paleolake were selected and their distribution in America during the Late Pliocene- Pleistocene was analyzed using the panbiogeographic method&#46; As a result of the overlap of 27 individual tracks&#44; 5 generalized tracks were obtained&#58; <span class="elsevierStyleItalic">I&#41;</span> Western North American&#44; <span class="elsevierStyleItalic">II&#41;</span> Central North American&#44; <span class="elsevierStyleItalic">III&#41;</span> Eastern North American&#44; <span class="elsevierStyleItalic">IV&#41;</span> Mesoamerican&#44; and <span class="elsevierStyleItalic">V&#41;</span> South American&#46; The generalized tracks are consistent with previous proposals for extant gymnosperms&#44; amphibians&#44; sauropsids&#44; birds&#44; mammals&#44; aquatic plants&#44; insects&#44; beetles&#44; and nematodes&#44; suggesting that distribution patterns have prevailed since the late Pliocene &#40;Blancan&#41;&#46; Four biogeographic nodes were identified&#44; 2 situated in North America&#44; in California and Colorado&#44; the third located in the Santa Mar&#237;a Amajac area in central Mexico&#44; and the fourth located in Central America&#46;</p></span>"
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        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">El paleolago de Santa Mar&#237;a Amajac se ubica en la parte central del estado de Hidalgo&#44; M&#233;xico&#46; Se seleccionaron 27 taxones f&#243;siles pertenecientes a plantas acu&#225;ticas y terrestres&#44; gaster&#243;podos&#44; ostr&#225;codos&#44; anfibios y mam&#237;feros que hab&#237;an sido previamente identificados en el &#225;rea del paleolago&#44; y se analiz&#243; su distribuci&#243;n en Am&#233;rica durante el Plioceno Tard&#237;o-Pleistoceno a trav&#233;s del m&#233;todo panbiogeogr&#225;fico&#46; Como resultado de la superposici&#243;n de los 27 trazos individuales se obtuvieron 5 trazos generalizados&#58; <span class="elsevierStyleItalic">I&#41;</span> norteamericano occidental&#44; <span class="elsevierStyleItalic">II&#41;</span> norteamericano central&#44; <span class="elsevierStyleItalic">III&#41;</span> norteamerciano oriental&#44; <span class="elsevierStyleItalic">IV&#41;</span> mesoamericano y <span class="elsevierStyleItalic">V&#41;</span> sudamericano&#46; Los trazos generalizados coinciden con los propuestos para gimnospermas&#44; anfibios&#44; saur&#243;psidos&#44; aves&#44; mam&#237;feros&#44; plantas acu&#225;ticas&#44; insectos&#44; cole&#243;pteros y nem&#225;todos recientes&#59; lo que indica que los patrones de distribuci&#243;n han prevalecido desde el Plioceno tard&#237;o &#40;Blancano&#41;&#46; Se identificaron 4 nodos&#59; 2 localizados en Estados Unidos de Norteam&#233;rica&#44; en California y Colorado&#44; otro localizado en el &#225;rea de Santa Mar&#237;a Amajac&#44; en la parte central del pa&#237;s y el &#250;ltimo en Centroam&#233;rica&#46;</p></span>"
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        "descripcion" => array:1 [
          "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Individual tracks&#46; 1&#44; <span class="elsevierStyleItalic">Amelanchier</span> sp&#46;&#59; 2&#44; <span class="elsevierStyleItalic">Cercocarpus</span> sp&#46;&#59; 3&#44; <span class="elsevierStyleItalic">Crataegus</span> sp&#46;&#59; 4&#44; <span class="elsevierStyleItalic">Platanus</span> sp&#46;&#59; 5&#44; <span class="elsevierStyleItalic">Prunus</span> sp&#46;&#59; 6&#44; <span class="elsevierStyleItalic">Rhus</span> sp&#46;&#59; 7&#44; <span class="elsevierStyleItalic">Salix</span> sp&#46;&#59; 8&#44; <span class="elsevierStyleItalic">Populus</span> sp&#46;&#59; 9&#44; <span class="elsevierStyleItalic">Candona</span> sp&#46;</p>"
        ]
      ]
      1 => array:7 [
        "identificador" => "fig0010"
        "etiqueta" => "Figures 10-18"
        "tipo" => "MULTIMEDIAFIGURA"
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        "figura" => array:1 [
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          "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Individual tracks&#46; 10&#44; <span class="elsevierStyleItalic">Hyla</span> sp&#46;&#59; 11&#44; <span class="elsevierStyleItalic">Tremarctos</span> sp&#46;&#59; 12&#44; <span class="elsevierStyleItalic">Limnocythere</span> sp&#46;&#59; 13&#44; <span class="elsevierStyleItalic">Ambystoma</span> sp&#46;&#59; 14&#44; <span class="elsevierStyleItalic">Juniperus</span> sp&#46;&#59; 15&#44; <span class="elsevierStyleItalic">Typha</span> sp&#46;&#59; 16&#44; <span class="elsevierStyleItalic">Planorbis</span> sp&#46;&#44; 17&#44; <span class="elsevierStyleItalic">Darwinula</span> sp&#46;&#59; 18&#44; <span class="elsevierStyleItalic">Pinus</span> sp&#46;</p>"
        ]
      ]
      2 => array:7 [
        "identificador" => "fig0015"
        "etiqueta" => "Figures 19-27"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
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          "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">19&#44; <span class="elsevierStyleItalic">Quercus</span> sp&#46;&#59; 20&#44; <span class="elsevierStyleItalic">Paramylodon</span> sp&#46;&#59; 21&#44; <span class="elsevierStyleItalic">Mammuthus</span> sp&#46;&#59; 22&#44; <span class="elsevierStyleItalic">Pampatherium</span> sp&#46;&#59; 23&#44; <span class="elsevierStyleItalic">Cuvieronius</span> sp&#46;&#59; 24&#44; <span class="elsevierStyleItalic">Sylvilagus</span> sp&#46;&#59; 25&#44; <span class="elsevierStyleItalic">Equus</span> sp&#46;&#59; 26&#44; <span class="elsevierStyleItalic">Platygonus</span> sp&#46;&#59;27&#44; <span class="elsevierStyleItalic">Rhynchotherium</span> sp&#46;</p>"
        ]
      ]
      3 => array:7 [
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        "etiqueta" => "Figure 28"
        "tipo" => "MULTIMEDIAFIGURA"
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          "en" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Generalized tracks and nodes obtained&#46; I&#44; Western North American&#59; II&#44; Central North American&#59; III&#44; Eastern North American&#59; IV&#44; Mesoamerican&#59; V&#44; South American&#59; a&#44; b&#44; c&#44; and d&#44; nodes located in California&#44; Colorado&#44; Santa Mar&#237;a Amajac&#44; and Guatemala&#44; respectively&#46;</p>"
        ]
      ]
      4 => array:7 [
        "identificador" => "tbl0005"
        "etiqueta" => "Table 1"
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                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="table-head  " align="left" valign="bottom" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">Taxa</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="center" valign="bottom" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">Genera</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom"><span class="elsevierStyleItalic">Terrestrial plants</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Amelanchier</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Cercocarpus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Crataegus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Juniperus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Pinus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Platanus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Populus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Prunus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Quercus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Rhus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Salix</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">Aquatic plants&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Typha</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">Gasteropods&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Planorbis</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">Ostracods&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Candona</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Darwinula</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Limnocythere</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">Amphibians&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Ambystoma</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Hyla</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">Mammals&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Pampatherium</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Paramylodon</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Cuvieronius</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Mammuthus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Rhynchotherium</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Sylvilagus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Equus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Platygonus</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Tremarctos</span> sp&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
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          "en" => "<p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Taxa considered in the panbiogeographic analysis</p>"
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        "identificador" => "tbl0010"
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        "tipo" => "MULTIMEDIATABLA"
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                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="table-head  " align="left" valign="bottom" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">Tracks</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="center" valign="bottom" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">Genera</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">I&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Amelanchier&#44; Cercocarpus&#44; Crataegus&#44; Platanus&#44; Prunus&#44; Rhus&#44; Salix</span>&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">II&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Populus&#44; Candona&#44; Limnocythere&#44; Ambystoma&#44; Hyla&#44; Tremarctos</span>&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">III&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Juniperus&#44; Thypa Planorbis&#44; Darwinula</span>&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">IV&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Pinus&#44; Quercus&#44; Paramylodon&#44; Mammuthus</span>&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="bottom">V&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="center" valign="bottom"><span class="elsevierStyleItalic">Pampatherium&#44; Cuvieronius&#44; Sylvilagus&#44; Equus&#44; Platygonus</span>&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
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        "descripcion" => array:1 [
          "en" => "<p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Genera that support the generalized tracks identified</p>"
        ]
      ]
    ]
    "bibliografia" => array:2 [
      "titulo" => "Literature cited"
      "seccion" => array:1 [
        0 => array:2 [
          "identificador" => "bibs0005"
          "bibliografiaReferencia" => array:49 [
            0 => array:3 [
              "identificador" => "bib0005"
              "etiqueta" => "Aguayo and Tr&#225;paga&#44; 1996"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:1 [
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:2 [
                            0 => "J&#46;E&#46; Aguayo"
                            1 => "R&#46; Tr&#225;paga"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Libro" => array:5 [
                        "titulo" => "Geodin&#225;mica de M&#233;xico y minerales del mar"
                        "fecha" => "1996"
                        "paginaInicial" => "106"
                        "editorial" => "Fondo de Cultura Econ&#243;mica"
                        "editorialLocalizacion" => "M&#233;xico D&#46;F"
                      ]
                    ]
                  ]
                ]
              ]
            ]
            1 => array:3 [
              "identificador" => "bib0010"
              "etiqueta" => "Aguilar and Ortiz&#44; 2000"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:1 [
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:2 [
                            0 => "F&#46; Aguilar"
                            1 => "M&#46;E&#46; Ortiz"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Libro" => array:5 [
                        "titulo" => "Estudio paleoecol&#243;gico de la flora plioc&#233;nica de Santa Mar&#237;a Amajac&#44; Hidalgo&#58; Inferencia del paleoclima y de la paleocomunidad"
                        "fecha" => "2000"
                        "paginaInicial" => "79"
                        "editorial" => "Bachelor&#39;s thesis Facultad de Ciencias&#44; Universidad Nacional Aut&#243;noma de M&#233;xico"
                        "editorialLocalizacion" => "M&#233;xico&#44; D&#46; F"
                      ]
                    ]
                  ]
                ]
              ]
            ]
            2 => array:3 [
              "identificador" => "bib0015"
              "etiqueta" => "Aguilar et al&#46;&#44; 2002"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:1 [
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:3 [
                            0 => "F&#46; Aguilar"
                            1 => "A&#46; Silva-Pineda"
                            2 => "M&#46;P&#46; Velasco-de Le&#243;n"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Libro" => array:4 [
                        "titulo" => "Registro de <span class="elsevierStyleItalic">Equisetum hyemale</span> en el Plioceno de la regi&#243;n de Santa Mar&#237;a Amajac&#44; Hidalgo&#44; M&#233;xico&#46; VII Congreso Latinoamericano y II Congreso Colombiano de Bot&#225;nica&#46; Cartagena de Indias&#44; Colombia"
                        "fecha" => "2002"
                        "paginaInicial" => "378"
                        "editorial" => "Asociaci&#243;n Latinoamericana de Bot&#225;nica"
                      ]
                    ]
                  ]
                ]
              ]
            ]
            3 => array:3 [
              "identificador" => "bib0020"
              "etiqueta" => "Aguilar-Aguilar and Contreras-Medina&#44; 2003"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "La distribuci&#243;n de los mam&#237;feros marinos de M&#233;xico&#58; un enfoque panbiogeogr&#225;fico"
                      "autores" => array:1 [
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                      "Libro" => array:5 [
                        "titulo" => "Interpretaci&#243;n clim&#225;tica de dos localidades f&#243;siles en Santa Mar&#237;a Amajac&#44; Hidalgo&#44; con base en la arquitectura foliar M&#46; Sc&#46; Thesis"
                        "fecha" => "2013"
                        "paginaInicial" => "102"
                        "editorial" => "Universidad Aut&#243;noma del Estado de Hidalgo"
                        "editorialLocalizacion" => "Pachuca"
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        "identificador" => "xack147157"
        "titulo" => "Acknowledgments"
        "texto" => "<p id="par0055" class="elsevierStylePara elsevierViewall">We want to acknowledge the Paleontology Lab at the UAEH where this research was done&#46; APR acknowledges Conacyt for the scholarship number 229929&#46; We thank referees for their comments&#44; which significantly contributed to improving this publication&#46;</p>"
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Article information

ISSN: 18703453
Original language: English

DOI:10.7550/rmb.44392

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Year/Month	Html	Pdf	Total

2024 November	4	0	4
2024 October	30	5	35
2024 September	27	1	28
2024 August	22	2	24
2024 July	17	3	20
2024 June	9	2	11
2024 May	6	1	7
2024 April	13	2	15
2024 March	11	8	19
2024 February	11	3	14
2024 January	18	5	23
2023 December	6	11	17
2023 November	29	5	34
2023 October	21	32	53
2023 September	5	2	7
2023 August	4	1	5
2023 July	18	3	21
2023 June	23	2	25
2023 May	17	6	23
2023 April	17	2	19
2023 March	13	3	16
2023 February	11	7	18
2023 January	16	6	22
2022 December	22	3	25
2022 November	21	6	27
2022 October	18	11	29
2022 September	21	7	28
2022 August	21	5	26
2022 July	19	8	27
2022 June	24	8	32
2022 May	32	12	44
2022 April	22	12	34
2022 March	17	13	30
2022 February	32	5	37
2022 January	42	7	49
2021 December	26	6	32
2021 November	28	6	34
2021 October	31	8	39
2021 September	10	9	19
2021 August	13	7	20
2021 July	3	4	7
2021 June	3	8	11
2021 May	18	6	24
2021 April	11	14	25
2021 March	11	20	31
2021 February	10	11	21
2021 January	5	12	17
2020 December	8	10	18
2020 November	13	4	17
2020 October	16	2	18
2020 September	4	3	7
2020 August	15	5	20
2020 July	15	1	16
2020 June	9	6	15
2020 May	8	4	12
2020 April	14	2	16
2020 March	19	5	24
2020 February	16	4	20
2020 January	15	7	22
2019 December	18	8	26
2019 November	10	5	15
2019 October	14	2	16
2019 September	19	8	27
2019 August	9	0	9
2019 July	21	5	26
2019 June	47	19	66
2019 May	128	44	172
2019 April	61	9	70
2019 March	10	7	17
2019 February	8	5	13
2019 January	12	3	15
2018 December	3	6	9
2018 November	14	5	19
2018 October	19	5	24
2018 September	3	11	14
2018 August	9	11	20
2018 July	7	4	11
2018 June	6	5	11
2018 May	8	13	21
2018 April	14	7	21
2018 March	2	5	7
2018 February	6	3	9
2018 January	14	2	16
2017 December	5	1	6
2017 November	10	11	21
2017 October	13	2	15
2017 September	15	10	25
2017 August	9	4	13
2017 July	7	1	8
2017 June	13	19	32
2017 May	13	9	22
2017 April	12	25	37
2017 March	14	97	111
2017 February	16	5	21
2017 January	12	1	13
2016 December	18	7	25
2016 November	23	2	25
2016 October	29	2	31
2016 September	17	11	28
2016 August	6	2	8
2016 July	7	1	8

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