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

Nilsson, Anna LU ; Lindström, Åke LU ; Jonzén, Niclas LU ; Nilsson, Sven LU and Karlsson, L (2006) In Global Change Biology 12(10). p.2014-2022
Abstract
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... (More)
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). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Global Change Biology
volume
12
issue
10
pages
2014 - 2022
publisher
Wiley-Blackwell
external identifiers
  • wos:000240561000017
  • scopus:33748683162
ISSN
1354-1013
DOI
10.1111/j.1365-2486.2006.01237.x
language
English
LU publication?
yes
id
bde193b3-f6fc-4556-a864-79f3c7273234 (old id 162703)
date added to LUP
2007-06-26 10:38:16
date last changed
2019-10-23 02:22:00
@article{bde193b3-f6fc-4556-a864-79f3c7273234,
  abstract     = {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).},
  author       = {Nilsson, Anna and Lindström, Åke and Jonzén, Niclas and Nilsson, Sven and Karlsson, L},
  issn         = {1354-1013},
  language     = {eng},
  number       = {10},
  pages        = {2014--2022},
  publisher    = {Wiley-Blackwell},
  series       = {Global Change Biology},
  title        = {The effect of climate change on partial migration - the blue tit paradox},
  url          = {http://dx.doi.org/10.1111/j.1365-2486.2006.01237.x},
  volume       = {12},
  year         = {2006},
}