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Beaver lodge location on the upstream Loire River
Joëlle Fustec1, Jean-Paul Cormier, Thierry Lodé
1Ecole Supérieure d'Agriculture d'Angers LEVA, 55 rue Rabelais, B.P. 748, 49007 Angers, France. j.fustec@esa-angers.educagri.fr
Comptes Rendus Biologies
|October 16, 2003
Summary
Eurasian beavers prefer specific river habitats for lodge construction, favoring areas without sandbanks and with ample tree cover. Human development, or anthropization, reduces the availability of these ideal beaver habitats along the Loire River.
Area of Science:
- Ecology
- Riverine ecosystems
- Wildlife habitat assessment
Background:
- Eurasian beavers (Castor fiber) are expanding their range in the Loire River.
- Understanding habitat selection is crucial for managing beaver populations and riverine environments.
Purpose of the Study:
- To identify key habitat characteristics influencing Eurasian beaver lodge site selection.
- To predict the availability of suitable lodge sites in a downstream section of the Loire River.
Main Methods:
- Comparative analysis of habitat features at sites with beaver lodges, cut trees, and no beaver presence.
- Development of a predictive model for lodge site suitability based on identified environmental predictors.
Main Results:
- Absence of sandbanks and presence of canopy cover (10-15m trees, tall/bushy Salicaceae) are significant predictors for lodge establishment.
- The model estimated a decreasing number of suitable lodge sites in downstream areas with increasing human impact (anthropization).
Conclusions:
- Specific habitat attributes, particularly riparian vegetation and bank structure, are critical for Eurasian beaver colonization.
- Increasing anthropization poses a challenge to the availability of suitable habitats for beavers in the Loire River, potentially limiting future expansion.