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Differences in growth rate, body condition, habitat use and food availability between island and mainland lizard populations of Anolis nebulosus in Jalisco, Mexico

Published online by Cambridge University Press:  27 June 2014

Héctor Hugo Siliceo-Cantero
Affiliation:
Posgrado en Ciencias Biológicas, Instituto de Biología, Universidad Nacional Autónoma de México. C. P. 04510
Andrés García*
Affiliation:
Estación de Biología Chamela, Instituto de Biología, Universidad Nacional Autónoma de México. C. P. 48980
*
1Corresponding author. Email: chanoc@ib.unam.mx

Abstract:

Lizards of the genus Anolis have been widely studied, however, little is known about the effects of environmental seasonality, food availability and geographic isolation on body condition, growth rate and habitat use of lizards. The existence of an insular and a continental population of Anolis nebulosus (clouded anole), separated by only 0.47 km, represents an ideal opportunity to address this topic. We compared seasonal fluctuations in food availability (arthropod density) for anoles, as well as body condition, growth rate and habitat use in the two populations. Food availability throughout the year was sampled every 2 mo by trapping arthropods at each site. Lizards were also monitored and measured every 2 mo by surveying three quadrats in each site over 2 y giving a total of 30 visits for each quadrat. Results suggested that composition and density of food supply was similar for the two populations. Nevertheless, food supply responded to seasonality of rainfall, with an increase of 1.5 times during the rainy season. Despite similarity in food availability, insular anoles had body condition that was 5–10 times better, with growth rate twice as fast, and used similar perches. The role of predation, and inter- and intraspecific competition are discussed as possible drivers.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2014 

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References

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