How does landscape use influence small mammal diversity, abundance and biomass in hedgerow networks of farming landscapes?

摘要: Over the last decades, profound changes in agricultural practices world have led to modifications of land-use as well landscape structure and composition. Major resulted enlargement parcel size, increase cultivated areas drastic reduction permanent elements such woods, hedges or natural meadows. In this context we chose investigate composition small mammal communities hedgerow networks three units Western France (Brittany) differing by their level intensity network density: a slightly intensified dense unit (BOC1), moderately fragmented (BOC2) highly on an area reclaimed from sea (POL). Characterization was performed using live trapping habitats (eight per unit). each 24 units, standardized method used consisting baited 100-m trap-line. Diversity indices were compare communities. Species richness didn't vary across landscapes whereas Shannon's index diversity underlined clear difference between, one hand, most (POL) which displayed lowest and, other two less units. The abundance mammals differed between sites: they significantly more numerous site than sites. Differences species also appeared: for example, Bank vole (Clethrionomys glareolus) very characteristic POL, Pygmy shrew (Sorex minutus) much associated with BOC Within hedges, like abundance, biomass highest (POL > BOC2 = BOC1). On contrary, at scale, POL (BOC1 POL) because fragmentation network.