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The effect of climate change on partial migration - the blue tit paradox

Författare:
Publiceringsår: 2006
Språk: Engelska
Sidor: 2014-2022
Publikation/Tidskrift/Serie: Global Change Biology
Volym: 12
Nummer: 10
Dokumenttyp: Artikel
Förlag: Blackwell Publishing

Sammanfattning

Climate change has proven to affect various aspects of the migration of birds. In response to milder winters making the habitat more profitable and increasing the survival of residents, the migratory fraction of partially migratory populations has been predicted to decline. We studied the blue tit Parus caeruleus, a common partial migrant in southern Sweden. The numbers migrating at Falsterbo, a migratory passage site in SW Sweden, has increased during the last decades, in parallel with increasing winter and annual temperatures. Migration data from Falsterbo were compared with yearly indices of the size of the breeding population as estimated by the Swedish National Bird Monitoring Programme. Over the study period 1975-2004, also the breeding population has increased in size. The proportion of blue tits migrating each year did not change over the study period, or possibly even increased slightly, which is in contrast to how climate change has been predicted to influence populations containing both migratory and resident individuals. The most important factors determining the intensity of blue tit migration in a given year was the size of an important winter food source, the beech mast crop (more migrants at lower crops) and the size of the breeding population (more migrants at higher densities).

Disputation

Nyckelord

  • Biology and Life Sciences

Övriga

Published
Yes
  • ISSN: 1354-1013

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