Matching a Changing World - the Importance of Habitat Characteristics for Farmland Breeding Eurasian Curlew

摘要: Where animals are and what they do, is the result of a continuous cost-benefit analysis available alternatives. Choices have to be made, for example when settling in breeding territory after migration, foraging conditions change, humans change landscape, or predator approaches nest. In this thesis, I used Eurasian curlew data address these issues at national, landscape agricultural field level. The results show that farmland was most important habitat species (appr. four times as mires), but < 40 ha patches embedded forest landscapes were seldom used. During first part season, birds preferred forage on leys, later shifted cereal fields. No effect construction Bothnia Line railway densities could shown. Finally, experimental nests showed chances hatching success best incubating bird leaved nest neither very soon nor late. Albeit flexible behaviour, curlews seem demand contain sufficiently large farmland, preferably with mixtures fields under different management.