Demography of a Knob-Scaled Lizard in Northeastern Querétaro, México
| Autor: | Yuan-Mou Chang, Adrián Nieto-Montes de Oca, J. Gastón Zamora-Abrego, Jerald B. Johnson, J. Jaime Zúñiga-Vega |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Herpetologica. 66:39-51 |
| ISSN: | 1938-5099 0018-0831 |
| DOI: | 10.1655/09-005.1 |
| Popis: | Demographic data are essential to determine the probability that species will persist over time. Unfortunately, demographic studies are rarely part of the initial evaluation of potentially threatened or endangered species. Here, we studied the population dynamics of a poorly known knob-scaled lizard species (Xenosaurus sp.) from Mexico with the use of a population matrix modeling approach. We measured annual fecundity and survival over three consecutive years (2001–2004) and used these data to generate transition matrices. From these matrices we estimated annual variability in finite population growth rate (λ), stable stage structure, and the relative importance of the life-cycle components for λ (elasticity values). In 2 of the 3 yr population growth rates indicated a tendency toward population increase (λ01–02 = 1.20 and λ02–03 = 1.14), whereas in 1 of the 3 yr population growth rate indicated population decrease (λ03–04 = 0.78). The negative population trend observed during 2003–2004 was... |
| Databáze: | OpenAIRE |
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