Stress hormone dynamics: an adaptation to migration?
AUTOR(ES)
Nilsson, Anna L. K.
FONTE
The Royal Society
RESUMO
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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2781924Documentos Relacionados
- Hormone receptor topology and dynamics: Morphological analysis using ferritin-labeled epidermal growth factor
- The Peopling of the Americas: A Second Major Migration?
- Series on Chromatin Dynamics: Dedication to Alan Wolffe
- Protein dynamics: hydration and cavities
- User and Information Dynamics: Managing Change