Supporting the Sustainable Management
of Amphibian and Reptile
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Volume 7, Number
Table of Contents
Summary: Summary: We reassess the conservation status of the
reptile fauna of Mexico based on the use of the EVS (Envrionmental Vulnerability Score) Measure. We
also update the content of the reptile fauna from that indicated in the book Conservation of
Mesoamerican Amphibian and Reptiles (2010) to 849 species. Our results very widely from
those obtained during an IUCN workshop held in 2005. Based on these results, we provide a set of
eight recommendations and conclusions of importance to individuals dedicated to reversing trends of
environmental degradation and biodiversity decline in Mexico.
bilineatus, Photo by Javier Alvarado. Right: A.
russeolus, Photo by Kevin Zansler, courtesy of Robert A.
lines of evidence suggest that populations of cantils (Agkistrodon bilineatus, A.
taylori) are in decline. Pronounced differences in conservation assessments (IUCN,
Environmental Vulnerability Scores) led us to conduct a taxonomic reassessment of the common cantil
(A. bilineatus), to determine if the recognized subspecies merit specific status. Based on
morphological, biogeographical, and DNA-based evidence we elevate the three previously recognized
subspecies of A. bilineatus to full species. Given this taxonomic reassessment, we examine
the conservation status of the newly elevated taxa and provide conservation
and conservation status of the beaded lizard, Heloderma horridum (Squamata:
Helodermatidae). 2013. Randall S. Reiserer,
Gordon W. Schuett, Daniel D.
Beck. Amphibian & Reptile
Conservation 7(1): 74–96.
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horridum, Photo by Javier
Alvarado. Right: H. c
harlesbogerti, Photo by Daniel Ariano-Sánchez.
beaded lizard (Heloderma horridum) is threatened by human persecution, habitat
degradation, and recent climate change. Recent DNA-based studies of the beaded lizard suggest that
the current use of subspecies underestimates their biodiversity and that species status is
warranted. Based on multiple lines of evidence, including a review of the use of subspecies in
taxonomy, we elevate the four subspecies of beaded lizards to full species: Heloderma
alvarezi (Chiapan beaded lizard), H. charlesbogerti (Guatemalan beaded lizard),
H. exasperatum (Río Fuerte beaded lizard), and H. horridum (Mexican beaded
lizard). Finally, we propose a series of research programs and make conservation
A reassessment of the
conservation status of the amphibians of Mexico based on the EVS measure.
2013. Larry D. Wilson,
Jerry D. Johnson, Vincente Mata-Silva. Amphibian & Reptile Conservation 7(1): 97–127.
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Left: Pseudoeurycea naucampatepetl, Photo by
James Hanken. Right: Craugastor
hobartsmithi, Photo by Iván Trinidad
Summary: Global amphibian population decline is an environmental
super-problem with broad impact on the diverse and highly endemic-rich Mexican amphibian fauna.
Results using the Environmental Vulnerability Score algorithm demonstrate that this fauna is highly
imperiled, just like the Mexican reptile fauna, as illustrated in a companion paper in the Special
Mexico Issue. A major paradigm shift in human thought and action will be necessary for this problem
to be resolved. Accordingly, we provide five broad-based recommendations.
tancitarensis, Photo by Javier Alvarado-Díaz.
Right: Incilius pissinus, Photo by Oscar
Within highly biodiverse Mexico, the state of Michoacán is a major center of herpetofaunal
diversity and endemicity, with a higher proportion of endemicity (66.0%) than that reported for the
country as a whole. The herpetofauna of the state consists of 215 species, including 54 amphibians
and 161 reptiles, classified in 96 genera and 38 families. We examined the physiographic
distribution of the herpetofauna of Michoacán and found that among the five recognized
physiographic provinces, almost one-half of these species occur in a single province. The largest
number of species is found in the Sierra Madre del Sur, with slightly fewer encountered in the
Balsas-Tepalcatepec Depression and the Transverse Volcanic Axis. We analyzed the conservation
status of the state’s herpetofauna using the EVS measure, and concluded that about 40% of the
species are categorized at the highest level of environmental vulnerability. We provide seven
recommendations for the protection of Michoacán’s herpetofauna in perpetuity.
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