Record Details

Terán-Juárez, Sergio A;García-Padilla, Elí;Mata-Silva, Vicente;Johnson, Jerry D;Wilson, Larry David
The herpetofauna of Tamaulipas, Mexico: composition, distribution, and conservation status
Mesoamerican Herpetology
Journal Article
Ctenosaura acanthura;Iguana iguana
The herpetofauna of Tamaulipas, the northeasternmost state in Mexico, is comprised of 184 species, including 31 anurans, 13 salamanders, one crocodylian, 124 squamates, and 15 turtles. We documented the distribution of these species among the seven physiographic regions we recognize. The number of species in these regions ranges from 30 in the Sierras y Llanuras Occidentales to 135 in the Gran Sierra Plegada. The species reside in from one to seven regions (x- = 2.5). The greatest number of single-region species occurs in the Gran Sierra Plegada. About six out of every 10 species are restricted to one or two physiographic regions, which is of considerable conservation significance. We constructed a Coefficient of Biogeographic Resemblance (CBR) matrix in which the number of shared species is demonstrated as ranging from six to 73. We employed these data in building a UPGMA dendrogram, which illustrates that the low elevation regions cluster together, as well as the higher elevation regions, of which all of the latter abut portions of the former. The most distinctive but least speciose physiographic region is located in the southwestern corner of the state and abuts the most speciose region to the east. We allocated the members of the Tamaulipan herpetofauna to four distributional categories, of which the largest number is comprised of the non-endemics (120), followed by the country endemics (49), state endemics (10), and non-natives (five). We examined the conservations status of the native species by utilizing the SEMARNAT, IUCN, and EVS systems. Of these systems, the EVS proved to be the most useful for assessing the conservation status of the herpetofauna of the state. The number of species in the three EVS categories increased from low (53) to medium (72), and decreased to high (49). Additionally, we employed the EVS ratings to judge how the species in the IUCN categories of DD, NE, and LC might be evaluated more accurately. We also used a scheme for ascertaining Relative Herpetofaunal Priority (RHP), a simple means for determining the rank order of a regional herpetofauna dependent on the number of state and national endemic species, as well as the number of EVS species assessed with high vulnerability. Using these two measures, we found the Gran Sierra Plegada to occupy rank order one in both cases. We also discussed the ability of the state's protected areas, including a biosphere reserve, to protect the members of the herpetofauna. Based on our analyses, we present our conclusions and provide recommendations for the future protection of the Tamaulipan herpetofauna.