Home range and foraging habitat selection by breeding lesser kestrels (Falco naumanni) in Greece

摘要

Home range size and foraging habitat use in breeding lesser kestrels (Falco naumanni), a bird species of conservation concern, were investigated during the breeding season of the species in 2008 in an intensively cultivated area of central Greece, using radio-tracking. Grasshopper (the main prey) densities were measured at the most important habitats (cotton, cereals, grasslands and margins). Home ranges were not significantly different between sexes either as overall means or during incubation and nestling periods. Movements of both sexes were non-random during incubation but random during the nestling period. Habitats used by males during incubation ranked as: margins>other>cotton>corn>cereals and during nestling period as: cereals>margins>grasslands>corn>cotton. Female habitat use greatly differed ranking as cereals>cotton>grasslands during incubation and as grassland>cotton>corn>cereals>margins during nestling period. Female habitat use seemed to be in disagreement with the conditions generally favouring prey availability, probably for reasons associated with low and uniform distribution of grasshopper densities over the habitats.