R. Duhamel et al., Landscape effects on the population dynamics of the fossorial form of the water vole (Arvicola terrestris sherman), LANDSC ECOL, 15(2), 2000, pp. 89-98
The dynamics of microtine rodents show large variations among species and e
ven among populations of a single species. Several studies have shown that
landscape structure and predation play a role in these variations. We studi
ed the influence of landscape structure on the spatial distribution and the
population dynamics of the fossorial form of the water vole (Arvicola terr
estris sherman). The sampling was based on a preliminary five-year survey o
f a rodent cycle on a regional scale, as well as a method of abundance esti
mation using surface indices. This survey led to distinguishing epicentres
where outbreaks started, and diffusion sections where outbreaks occurred la
ter. Results showed differences in dynamics of spatial distribution of the
vole colonies between these two types of sections. This distribution patter
n is related to landscape composition and structure. Epicentres are charact
erized by a higher ratio of open landscape, a lower ratio of forest, and le
ss fragmentation when compared to the diffusion sections. Therefore landsca
pe analysis has the potential of providing a valuable framework for the des
igning of programs for the early control of A. terrestris populations.