Sexual Dimorphism in the Alligator Lizard Gerrhonotus infernalis (Sauria: Anguidae): Implications for Sexual Selection

Sexual dimorphism is common in many clades of reptiles. The Texas alligator lizard (Gerrhonotus infernalis) is a lizard distributed in North America, from Texas in the southern United States to the state of San Luis Potosí in central Mexico. Very little data exist on the presence of sexual dimorphis...

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Veröffentlicht in:The Southwestern naturalist 2013-06, Vol.58 (2), p.202-208
Hauptverfasser: García-Bastida, Margarita, Lazcano, David, McBrayer, Lance D, Mercado-Hernández, Roberto
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creator García-Bastida, Margarita
Lazcano, David
McBrayer, Lance D
Mercado-Hernández, Roberto
description Sexual dimorphism is common in many clades of reptiles. The Texas alligator lizard (Gerrhonotus infernalis) is a lizard distributed in North America, from Texas in the southern United States to the state of San Luis Potosí in central Mexico. Very little data exist on the presence of sexual dimorphism and on the ecology of this species, particularly in Mexico. We document sexual dimorphism in a population of Gerrhonotus infernalis at Parque Ecológico Chipinque, Monterrey, Nuevo León, Mexico. We evaluated 12 morphological and one meristic character on 102 specimens. There were significant differences in the dimensions of the head and body, showing that there is sexual dimorphism in G. infernalis. Males showed positive allometry in cranial dimensions, while females showed isometric growth. Males had more bite marks, suggesting agonistic behavior in this species. This population of G. infernalis presents sexual dimorphism in body size and dimensions of the head, and this is likely a consequence of intrasexual selection. El dimorfismo sexual es común en varios clados de reptiles. El falso escorpión (Gerrhonotus infernalis) es una lagartija que se distribuye en el norte de América, desde Texas en el sur de Estados Unidos de América, hasta el estado de San Luis Potosí en el centro de México. Existe poca información sobre el dimorfismo sexual y la ecología de esta especie, particularmente en México. Documentamos el dimorfismo sexual en una población de Gerrhonotus infernalis en el Parque Ecológico Chipinque, Monterrey, Nuevo León, Mexico. Evaluamos 12 características morfológicas y una merística en 102 especímenes. Hubo diferencias significativas en las dimensiones de la cabeza y del cuerpo, evidenciando la existencia de dimorfismo sexual en G. infernalis. El patrón de crecimiento fue alométricamente positivo en los machos e isométrico en las hembras. En los machos se registró un número mayor de marcas de mordidas, sugiriendo que existe conducta agonista en esta especie. Existe dimorfismo sexual en el tamaño del cuerpo y las dimensiones de la cabeza de G. infernalis en la población estudiada y probablemente dicho dimorfismo es consecuencia de la selección intrasexual.
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The Texas alligator lizard (Gerrhonotus infernalis) is a lizard distributed in North America, from Texas in the southern United States to the state of San Luis Potosí in central Mexico. Very little data exist on the presence of sexual dimorphism and on the ecology of this species, particularly in Mexico. We document sexual dimorphism in a population of Gerrhonotus infernalis at Parque Ecológico Chipinque, Monterrey, Nuevo León, Mexico. We evaluated 12 morphological and one meristic character on 102 specimens. There were significant differences in the dimensions of the head and body, showing that there is sexual dimorphism in G. infernalis. Males showed positive allometry in cranial dimensions, while females showed isometric growth. Males had more bite marks, suggesting agonistic behavior in this species. This population of G. infernalis presents sexual dimorphism in body size and dimensions of the head, and this is likely a consequence of intrasexual selection. El dimorfismo sexual es común en varios clados de reptiles. El falso escorpión (Gerrhonotus infernalis) es una lagartija que se distribuye en el norte de América, desde Texas en el sur de Estados Unidos de América, hasta el estado de San Luis Potosí en el centro de México. Existe poca información sobre el dimorfismo sexual y la ecología de esta especie, particularmente en México. Documentamos el dimorfismo sexual en una población de Gerrhonotus infernalis en el Parque Ecológico Chipinque, Monterrey, Nuevo León, Mexico. Evaluamos 12 características morfológicas y una merística en 102 especímenes. Hubo diferencias significativas en las dimensiones de la cabeza y del cuerpo, evidenciando la existencia de dimorfismo sexual en G. infernalis. El patrón de crecimiento fue alométricamente positivo en los machos e isométrico en las hembras. En los machos se registró un número mayor de marcas de mordidas, sugiriendo que existe conducta agonista en esta especie. 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The Texas alligator lizard (Gerrhonotus infernalis) is a lizard distributed in North America, from Texas in the southern United States to the state of San Luis Potosí in central Mexico. Very little data exist on the presence of sexual dimorphism and on the ecology of this species, particularly in Mexico. We document sexual dimorphism in a population of Gerrhonotus infernalis at Parque Ecológico Chipinque, Monterrey, Nuevo León, Mexico. We evaluated 12 morphological and one meristic character on 102 specimens. There were significant differences in the dimensions of the head and body, showing that there is sexual dimorphism in G. infernalis. Males showed positive allometry in cranial dimensions, while females showed isometric growth. Males had more bite marks, suggesting agonistic behavior in this species. This population of G. infernalis presents sexual dimorphism in body size and dimensions of the head, and this is likely a consequence of intrasexual selection. 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The Texas alligator lizard (Gerrhonotus infernalis) is a lizard distributed in North America, from Texas in the southern United States to the state of San Luis Potosí in central Mexico. Very little data exist on the presence of sexual dimorphism and on the ecology of this species, particularly in Mexico. We document sexual dimorphism in a population of Gerrhonotus infernalis at Parque Ecológico Chipinque, Monterrey, Nuevo León, Mexico. We evaluated 12 morphological and one meristic character on 102 specimens. There were significant differences in the dimensions of the head and body, showing that there is sexual dimorphism in G. infernalis. Males showed positive allometry in cranial dimensions, while females showed isometric growth. Males had more bite marks, suggesting agonistic behavior in this species. This population of G. infernalis presents sexual dimorphism in body size and dimensions of the head, and this is likely a consequence of intrasexual selection. El dimorfismo sexual es común en varios clados de reptiles. El falso escorpión (Gerrhonotus infernalis) es una lagartija que se distribuye en el norte de América, desde Texas en el sur de Estados Unidos de América, hasta el estado de San Luis Potosí en el centro de México. Existe poca información sobre el dimorfismo sexual y la ecología de esta especie, particularmente en México. Documentamos el dimorfismo sexual en una población de Gerrhonotus infernalis en el Parque Ecológico Chipinque, Monterrey, Nuevo León, Mexico. Evaluamos 12 características morfológicas y una merística en 102 especímenes. Hubo diferencias significativas en las dimensiones de la cabeza y del cuerpo, evidenciando la existencia de dimorfismo sexual en G. infernalis. El patrón de crecimiento fue alométricamente positivo en los machos e isométrico en las hembras. En los machos se registró un número mayor de marcas de mordidas, sugiriendo que existe conducta agonista en esta especie. Existe dimorfismo sexual en el tamaño del cuerpo y las dimensiones de la cabeza de G. infernalis en la población estudiada y probablemente dicho dimorfismo es consecuencia de la selección intrasexual.</abstract><cop>Department of Biology, Box 1651, Edwardsville, IL 62026</cop><pub>The Southwestern Association of Naturalists Southern Illinois University Edwardsville</pub><doi>10.1894/0038-4909-58.2.202</doi><tpages>7</tpages></addata></record>
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subjects Alligators
Anguidae
Animal behavior
Aquariums
Biological research
Biology, Experimental
Diet
Dimorphism (Biology)
Feature s
Female animals
Gender
Gerrhonotus
Head
Herpetology
Lacertilia
Lizards
Male animals
Males
Mating behavior
Natural selection
Precipitation
Scars
Sexual dimorphism
Sexual selection
title Sexual Dimorphism in the Alligator Lizard Gerrhonotus infernalis (Sauria: Anguidae): Implications for Sexual Selection
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