Density, climate and varying return points: an analysis of long-term population fluctuations in the threatened European tree frog.
Oecologia
; 149(1): 65-71, 2006 Aug.
Article
em En
| MEDLINE
| ID: mdl-16779559
ABSTRACT
Experimental research has identified many putative agents of amphibian decline, yet the population-level consequences of these agents remain unknown, owing to lack of information on compensatory density dependence in natural populations. Here, we investigate the relative importance of intrinsic (density-dependent) and extrinsic (climatic) factors impacting the dynamics of a tree frog (Hyla arborea) population over 22 years. A combination of log-linear density dependence and rainfall (with a 2-year time lag corresponding to development time) explain 75% of the variance in the rate of increase. Such fluctuations around a variable return point might be responsible for the seemingly erratic demography and disequilibrium dynamics of many amphibian populations.
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Base de dados:
MEDLINE
Assunto principal:
Anuros
/
Clima
/
Ecossistema
/
Modelos Teóricos
Tipo de estudo:
Observational_studies
/
Prognostic_studies
Limite:
Animals
País como assunto:
Europa
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article