Population trends for Swedish breeding birds

摘要: We have assessed the population trends for 255 bird species breeding in Sweden (including distinct subspecies), based on data last 30 and 10 years, respectively. Over past years more decreased (38%) than increased (32%) numbers. In particular, formerly common farmland fared poorly but this is also true some forest species. there are with increasing (29%) decreasing (19%). Trends several long-term decline levelled off cases even started to increase. It not known whether recent change a result of conservation efforts or simply that numbers stabilised at lower levels now permitted by environment. therefore essential initiate research devoted finding factors directly linked ongoing changes, particularly decline. To cover all Swedish additional monitoring programmes needed, particular owls mountain habitats.