Abstract
1. The relationship between the yearly densities of avian predators and their microtine prey in western Finland was studied. Predator densities were determined by checking nest-boxes in forests [Tengmalm's owl (Aegolius funereus), hawk owl (Surnia ulula) and Ural owl (Strix uralensis)] and by searching for nests in farmland [short-eared owl (Asio flammeus), long-eared owl (Asio otus) and kestrel (Falco tinnunculus)]. Tengmalm's, Ural and hawk owls overwinter in Fennoscandia, long-eared owls are partially migratory, and short-eared owls and kestrels are migratory. 2. Prey densities were estimated by snap-trapping in spring (early May) and autumn (mid-September), and by snow-tracking in late February to early March (early spring) and late November to early December (late autumn)
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