DUCA abundant species were combined to express their ecological significance, which enabled to characterize each locality and season. Similarity indices (Jaccard, Gower) showed a clear association between the 4 most abundant species. The first two factors of a correspondence analysis accounted for 48.7% of the total variation and separate the localities fairly well. Factor 2 is strongly associated with HJ., a species mostly found in deep nests from an orchard.As the nests were not collected at all localities throughout the year, our conclusions concerning seasonal trends, differences between localities, effects of altitude or vegetation, should be taken with caution.1.de la forme fouisseuse du campagnol terrestre Arvicola terrestris L." Revue suisse de zoologie 96, 161-189.
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