Range expansion of Pallas's squirrel (Callosciurus erythraeus) introduced in southern France: Habitat suitability and space use

摘要: Abstract The study of space use and population density in different habitats is an important step understanding the expansion process introduced species gathering useful knowledge for management actions. Pallas's squirrel (Callosciurus erythraeus) was on Cap d’Antibes (southeastern France) at end 1960s. We used direct observations from a grid map centred onto known historical distribution to document expanding range squirrel. assessed habitat suitability invaded area through distance sampling nest counts examined by quantifying size home intra- inter-sexual overlap based radio-tracking suitable habitat. Our results confirm that has expanded its exponentially over past two decades, although with low diffusion coefficients (0.08–0.20 km/yr). Squirrels reached highest relative densities suburban woodlands, which females showed no territorial behaviour. indicate able establish various Antibes, preferentially woodlands gardens. Densely urbanised areas presence highway A8 (E80) acted as barriers slowed expansion. Such information crucial improve control programme started 2012 limit spread this potentially invasive