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1 March 2011 Demography of a Semelparous, High-Elevation Population of Sceloporus bicanthalis (Lacertilia: Phrynosomatidae) from the Nevado de Toluca Volcano, Mexico
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Abstract
We studied demography of a population of viviparous lizard, Sceloporus bicanthalis, from Nevado de Toluca Volcano, Mexico, using mark-recapture methods. Age structure of this population varied seasonally due to an increase in number of juveniles over summer, although neonates were observed in every month. Estimated average density was 304 individuals/ha. Snout-vent length at sexual maturity in viviparous S. bicanthalis was 31 mm in males and 32 mm in females. Males survived longer than females, with an expected lifespan of 15 months, compared to 8 months for females. Net reproductive rate of this population was 1, suggesting it was at equilibrium, while generation time was 7 months. This high-elevation population has a semelparous life cycle.
Felipe Rodríguez-Romero, Geoffrey R. Smith, Fernando Méndez-Sánchez, Oswaldo Hernández-Gallegos, Petra Sánchez Nava and Fausto R. Méndez de la Cruz "Demography of a Semelparous, High-Elevation Population of Sceloporus bicanthalis (Lacertilia: Phrynosomatidae) from the Nevado de Toluca Volcano, Mexico," The Southwestern Naturalist 56(1), (1 March 2011). https://doi.org/10.1894/GC-193.1
Received: 30 January 2008; Accepted: 1 October 2010; Published: 1 March 2011
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