Abstract:
:The hormone corticosterone (CORT) is an important component of a bird's response to environmental stress, but it can also have negative effects. Therefore, birds on migration are hypothesized to have repressed stress responses (migration-modulation hypothesis). In contrast to earlier studies on long-distance migrants, we evaluate this hypothesis in a population containing both migratory and resident individuals. We use a population of partially migratory blue tits (Cyanistes caeruleus) in southern Sweden as a model species. Migrants had higher CORT levels at the time of capture than residents, indicating migratory preparations, adaptation to stressors, higher allostatic load or possibly low social status. Migrants and residents had the same stress response, thus contradicting the migration-modulation hypothesis. We suggest that migrants travelling short distances are more benefited than harmed by retaining the ability to respond to stress.
journal_name
Biol Lettjournal_title
Biology lettersauthors
Nilsson AL,Sandell MIdoi
10.1098/rsbl.2009.0193subject
Has Abstractpub_date
2009-08-23 00:00:00pages
480-3issue
4eissn
1744-9561issn
1744-957Xpii
rsbl.2009.0193journal_volume
5pub_type
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