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Effects of El Niño and La Niña Southern Oscillation events on the adrenocortical responses to stress in birds of the Galapagos Islands

Effects of El Niño and La Niña Southern Oscillation events on the adrenocortical responses to stress in birds of the Galapagos Islands

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Prüfsumme: MD5:248cf200147d1a5afc65fa9f53b08f44

WINGFIELD, John C., Michaela HAU, P. Dee BOERSMA, L. Michael ROMERO, Nigella HILLGARTH, Marilyn RAMENOFSKY, Peter H. WREGE, Robert SCHEIBLING, J. Patrick KELLEY, Martin WIKELSKI, 2018. Effects of El Niño and La Niña Southern Oscillation events on the adrenocortical responses to stress in birds of the Galapagos Islands. In: General and Comparative Endocrinology. 259, pp. 20-33. ISSN 0016-6480. eISSN 1095-6840. Available under: doi: 10.1016/j.ygcen.2017.10.015

@article{Wingfield2018-04Effec-41230, title={Effects of El Niño and La Niña Southern Oscillation events on the adrenocortical responses to stress in birds of the Galapagos Islands}, year={2018}, doi={10.1016/j.ygcen.2017.10.015}, volume={259}, issn={0016-6480}, journal={General and Comparative Endocrinology}, pages={20--33}, author={Wingfield, John C. and Hau, Michaela and Boersma, P. Dee and Romero, L. Michael and Hillgarth, Nigella and Ramenofsky, Marilyn and Wrege, Peter H. and Scheibling, Robert and Kelley, J. Patrick and Wikelski, Martin} }

Romero, L. Michael Wikelski, Martin Wrege, Peter H. Scheibling, Robert Scheibling, Robert Wingfield, John C. 2018-04 eng Hillgarth, Nigella Boersma, P. Dee 2018-02-05T14:27:24Z Wingfield, John C. Wikelski, Martin Boersma, P. Dee Hau, Michaela terms-of-use Hillgarth, Nigella Romero, L. Michael El Niño Southern Oscillation events (ENSO) and the subsequent opposite weather patterns in the following months and years (La Niña) have major climatic impacts, especially on oceanic habitats, affecting breeding success of both land and sea birds. We assessed corticosterone concentrations from blood samples during standardized protocols of capture, handling and restraint to simulate acute stress from 12 species of Galapagos Island birds during the ENSO year of 1998 and a La Niña year of 1999. Plasma levels of corticosterone were measured in samples collected at capture (to represent non-stressed baseline) and subsequently up to 1 h post-capture to give maximum corticosterone following acute stress, and total amount of corticosterone that the individual was exposed to during the test period (integrated corticosterone). Seabird species that feed largely offshore conformed to the brood value hypothesis whereas inshore feeding species showed less significant changes. Land birds mostly revealed no differences in the adrenocortical responses to acute stress from year to year with the exception of two small species (<18 g) that had an increase in baseline and stress responses in the ENSO year - contrary to predictions. We suggest that a number of additional variables, including body size and breeding stage may have to be considered as explanations for why patterns in some species deviated from our predictions. Nevertheless, comparative studies like ours are important for improving our understanding of the hormonal and reproductive responses of vertebrates to large scale weather patterns and global climate change in general. Effects of El Niño and La Niña Southern Oscillation events on the adrenocortical responses to stress in birds of the Galapagos Islands Wrege, Peter H. Hau, Michaela Kelley, J. Patrick 2018-02-05T14:27:24Z Kelley, J. Patrick Ramenofsky, Marilyn Ramenofsky, Marilyn

Dateiabrufe seit 05.02.2018 (Informationen über die Zugriffsstatistik)

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