Relative importance of population processes and habitat characteristics in determining site occupancy of two anurans.

Détails

ID Serval
serval:BIB_E9FCE5054E02
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Relative importance of population processes and habitat characteristics in determining site occupancy of two anurans.
Périodique
Journal of Wildlife Management
Auteur(s)
Schmidt  B.R., Pellet  J.
ISSN
0022-541X
Statut éditorial
Publié
Date de publication
2005
Volume
69
Numéro
3
Pages
884-893
Résumé
The ecological niche is the conceptual foundation for the analysis of species distributions. Habitat variables and resources are therefore thought to determine the distribution of a species. However, metapopulation and source-sink models posit that population processes determine the local distribution of a species; metapopulation theory suggests that many suitable patches could be unoccupied and source-sink theory suggests that unsuitable patches could be occupied. We examined whether the distribution of 2 European anurans (tree frog [Hyla arborea] and natterjack toad [Bufo calamita]) was determined by habitat variables, local population size (as indexed by the number of calling males), or metapopulation characteristics are. We found that the distribution of both species was best predicted by the number of calling males in the previous years. This supports the idea that population processes are more important determinants of distribution than habitat characteristics. We suggest that future distribution models explicitly incorporate population dynamic processes. Our results suggest that there is a threshold number of calling males above which a population is almost certain to persist in the short-term. If more robust population data are not available, such a threshold should be useful for managing threatened anuran species because the number of calling males is easily determined.
Mots-clé
amphibian, Bufo calamita, call survey, chorus size, distribution, habitat variables, Hyla arborea, metapopulation, monitoring, population index, population size, site occupancy, Switzerland
Création de la notice
19/11/2007 11:52
Dernière modification de la notice
03/03/2018 22:24
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