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Morphological Characteristics of a Newly Discovered Population of Aspidoscelis tesselata (Squamata: Teiidae) from Chihuahua, México, the Identity of an Associated Hybrid, and a Pattern of Geographic Variation

Harry L. Taylor, Julio A. Lemos-Espinal and Hobart M. Smith
The Southwestern Naturalist
Vol. 48, No. 4 (Dec., 2003), pp. 692-700
Stable URL: http://www.jstor.org/stable/3672784
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Morphological Characteristics of a Newly Discovered Population of Aspidoscelis tesselata (Squamata: Teiidae) from Chihuahua, México, the Identity of an Associated Hybrid, and a Pattern of Geographic Variation
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Abstract

A population of the parthenogenetic teiid lizard, Aspidoscelis tesselata, was recently discovered in the vicinity of Benavides, Chihuahua, México. This population is located in the general area where A. tesselata originated, as a parthenogenetically competent F1 hybrid, from hybridization between A. tigris marmorata and A. gularis septemvittata. Subsequent to its origin, A. tesselata utilized habitats associated with the Rio Grande and Pecos River drainages to expand its range into New Mexico. We used a canonical variate analysis of samples from Chihuahua, México, and the Rio Grande and Pecos River distribution corridors in southern New Mexico to determine the pattern of morphological variation among the 4 populations. The 2 populations from New Mexico were divergent, both from the Chihuahuan populations (which were morphologically similar) and from each other. A male specimen, collected with A. tesselata in the Benavides vicinity, was identified as a putative A. tesselata × A. tigris marmorata hybrid. /// Una población de la lagartija téida partenogenética Aspidoscelis tesselata, fue recientemente descubierta en los alrededores de Benavides, Chihuahua, México. Esta población está localizada en el área más o menos donde A. tesselata se originó, como un híbrido F1 partenogenéticamente viable, de la hibridación entre A. tigris marmorata y A. gularis septemvittata. Subsecuentemente a su origen, A. tesselata utilizaba los hábitats asociados con las cuencas del Río Grande y del Río Pecos para extender su distribución a Nuevo México. Utilizamos un análisis de variables canónicas de muestreos de Chihuahua, México, y de los corredores de distribución del Río Grande y del Río Pecos en el sur de Nuevo México para determinar el patrón de variación morfológica entre las 4 poblaciones. Las 2 poblaciones de Nuevo México divergieron tanto de las poblaciones de Chihuahua (las cuales fueron morfológicamente similares) como entre ellas mismas. Un espécimen macho, recolectado con A. tesselata en los alrededores de Benavides, fue verificado como un posible híbrido de A. tesselata × A. tigris marmorata.

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