The British Herpetological Society

The Herpetological Journal is the Society's prestigious quarterly scientific journal. Articles are listed in Biological Abstracts, Current Awareness in Biological Sciences,Current Contents, Science Citation Index, and Zoological Record.

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pdf 06. Bunch grass lizard, Sceloporus scalaris, population dynamics at La Michilia biosphere reserve, Mexico

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Open Access

pp.33-39 

Authors: Alfredo Ortega-rubio, Gonzalo Halffter And Robert Barbault

Abstract: We studied the population dynamics of Sceloporus scalaris from 1 979 to 1 982 using mark-recapture methods. The estimated population density was 50 adults per hectare. The sex ratio was approximately 1:1, with females slightly predominating at older ages. Based on morphological data, four well-differentiated age classes were established - juveniles, sub-adults, adults < 1  yr and adults > 1yr. The mean clutch size was 8.8 eggs per female, but varied widely (5 to 12) in relation to female body size. The estimated number of hatchlings in 10 hectares was 2245 and embryo mortality was 13.89%. After hatching, the average mortality was higher than 76% for all ages and both sexes. The population life table indicates a Slobodkin Type IV survivorship curve, with a net reproductive rate of 1 .059. The average generation time for this population was 1.2 years.

Keywords: lizard, Mexico, population dynamics, Sceloporus scalaris

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