Hybridization between the endangered unisexual gray-checkered whiptail lizard (Aspidoscelis dixoni) and the bisexual western whiptail lizard (Aspidoscelis tigris) in southwestern New Mexico ; American Museum novitates, no. 3555

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dc.contributor.author Cole, Charles J. en_US
dc.contributor.author Painter, Charles W. (Charles Wilson), 1949- en_US
dc.contributor.author Dessauer, Herbert C. en_US
dc.contributor.author Taylor, Harry Leonard. en_US
dc.date.accessioned 2007-03-23T16:22:33Z
dc.date.available 2007-03-23T16:22:33Z
dc.date.issued 2007 en_US
dc.identifier.uri http://hdl.handle.net/2246/5843
dc.description 31 p. : ill. (some col.), maps ; 26 cm. en_US
dc.description Includes bibliographical references (p. 28-30). en_US
dc.description.abstract "Hybridization between the unisexual Aspidoscelis dixoni and the bisexual Aspidoscelis tigris punctilinealis in southwestern New Mexico is documented by observations and analyses of external morphology (coloration, size, scalation), chromosomes (karyotypes), nuclear gene products (allozymes), and mitochondrial DNA. The locality (Hidalgo County, Antelope Pass of the Peloncillo Mountains, centered at 10.5 km west of Animas), consisting of only a few square kilometers, is the only place where this particular unisexual clone of A. dixoni exists. Because of its extreme rarity in recent years, A. dixoni has been listed as an endangered species in New Mexico, and the status of its populations has received intense study. Today, the cause(s) of endangerment remains unknown, although we hypothesize that interspecific competition may be the problem. Aspidoscelis dixoni is a diploid unisexual species that normally reproduces by parthenogenetic cloning, as demonstrated here with genetic data from laboratory-reared lizards. However, fertilization of its eggs in Antelope Pass is possible if mating occurs with a male of the syntopic bisexual species A. tigris punctilinealis. The resulting hybrids closely resemble their maternal parent morphologically, but they are triploid and the females observed to date have been sterile. Aspidoscelis t. punctilinealis is a recent invader of southwestern New Mexico. It is the dominant species of whiptail lizard today in the low-elevation, semiarid habitat of creosote desertscrub in Antelope Pass. The present rarity of A. dixoni in Antelope Pass, in contrast to its abundance a few decades ago, may result from negative interactions with this dominant species, including asymmetrical destabilizing hybridization. Only a few other populations of A. dixoni are known to exist, each in a limited area in southwestern Texas, so there is a hiatus of nearly 500 km between the small and restricted populations in New Mexico and Texas. Comparative genetic data presented here indicate that although these populations are similar, the population in New Mexico represents a unique clone. It has three alleles at 3 nuclear gene loci (among 31 examined) that distinguish it from the Texan populations, and it lacks a microchromosome that occurs in Texan populations. In addition, in this paper we present new comparative genetic data confirming that the origin of A. dixoni itself was from a hybrid between an A. tigris marmorata [female] x A. gularis septemvittata [male], consistent with earlier studies"--P. 2. en_US
dc.format.extent 4273978 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, NY : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates, no. 3555 en_US
dc.subject.lcc QL1 .A436 no.3555, 2007 en_US
dc.subject.lcsh Aspidoscelis dixoni -- Hybridization. en_US
dc.subject.lcsh Aspidoscelis tigris punctilinealis -- Hybridization. en_US
dc.subject.lcsh Aspidoscelis -- Hybridization. en_US
dc.subject.lcsh Rare reptiles -- New Mexico -- Hidalgo County. en_US
dc.subject.lcsh Endangered species -- New Mexico -- Hidalgo County. en_US
dc.subject.lcsh Lizards -- Hybridization -- New Mexico -- Hidalgo County. en_US
dc.subject.lcsh Lizards -- New Mexico -- Hidalgo County en_US
dc.subject.lcsh Reptiles -- Hybridization -- New Mexico -- Hidalgo County. en_US
dc.subject.lcsh Reptiles -- New Mexico -- Hidalgo County en_US
dc.title Hybridization between the endangered unisexual gray-checkered whiptail lizard (Aspidoscelis dixoni) and the bisexual western whiptail lizard (Aspidoscelis tigris) in southwestern New Mexico ; American Museum novitates, no. 3555 en_US
dc.title.alternative Lizard hybridization en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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