Animal Biology , Vol. 54, No. 1, pp. 57-75 (2004) Ó Koninklijke Brill NV, Leiden, 2004. Also available online - www.brill.nl Structure of a population of the lizard Podarcis bocagei in northwest Spain: variations in age distribution, size distribution and sex ratio PEDRO GALÁN Departamento de Bioloxía Animal, Bioloxía Vexetal e Ecoloxía, Facultad de Ciencias, Universidad de A Coruña, Campus de A Zapateira, s/n, 15071 — A Coruña, Spain Abstract —Mark-recapture techniques were used to investigate population size, age distribution, size distribution and sex ratio in a population of the lacertid lizard Podarcis bocagei in an abandoned gravel pit in northwest Spain. The study was carried out over a 2-year period. Despite relatively high maximum longevity, the population age distribution was characteristic of small, short-lived lizard species (i.e., there was a relatively high proportion of immature individuals). Population size declined over the study period, largely because of a drop in the number of immature animals: this may be partially attributable to density-dependentfactors, but was probably due largely to a decline in habitat favourability as a result of colonisation of the study site by vegetation. The sex ratio was signi cantly female-biased in all cohorts studied, not only among
Animal Biology – Brill
Published: Jan 1, 2004
Keywords: LACERTIDAE; PODARCIS BOCAGEI; POPULATION STRUCTURE REPTILES; LIFE HISTORY; SEX-RATIO.
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