Abstract
An analysis of arrival dates documented since 1980 of 42 bird species migrating to breeding grounds in northern Norway showed a more recent response to climate change than has been published for migrants further south, with many species delaying the advance of arrival dates until the late 1990s. The earliest migrants were mainly birds that winter in south and east Europe. They advanced their dates most, despite no evident rise in early spring temperature in northern Norway since 1980. It is suggested that they were responding more to environmental conditions experienced en route northwards than in the breeding grounds. Because many species did, however, respond to short-term temperature variation in the region, an acceleration of their advancement of arrival dates can be expected if local temperatures start to rise in response to climate change.
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