Seasonal rainfall at long-term migratory staging sites is associated with altered carry-over effects in a Palearctic-African migratory bird
dc.contributor.author | Sorensen, Marjorie C | |
dc.contributor.author | Fairhurst, Graham D | |
dc.contributor.author | Jenni-Eiermann, Susanne | |
dc.contributor.author | Newton, Jason | |
dc.contributor.author | Yohannes, Elizabeth | |
dc.contributor.author | Spottiswoode, Claire N | |
dc.date.accessioned | 2021-10-08T06:20:19Z | |
dc.date.available | 2021-10-08T06:20:19Z | |
dc.date.issued | 2016 | |
dc.description.abstract | Abstract Background An understanding of year-round habitat use is essential for determining how carry-over effects shape population dynamics in long-distance migratory songbirds. The recent discovery of long-term migratory staging sites in many species, prior to arrival at final wintering sites, adds complexity to efforts to decipher non-breeding habitat use and connections between sites. We investigated whether habitat conditions during migratory staging carry over to influence great reed warbler (Acrocephalus arundinaceus) body condition at final wintering sites in Zambia. We asked whether the presence/absence and strength of such carry-over effects were modified by contrasting rainfall conditions during 2 years. Results First, we found that individuals staging in a dry year had higher corticosterone (CORT f ) and stable nitrogen isotope values (suggesting higher aridity) than birds staging in a wet year, indicating that regional weather affected staging conditions. Second, we found that carry-over effects from staging habitat conditions (measured via carbon and nitrogen isotopes) to final winter site body condition (measured via scaled mass index and β-hydroxybutyrate) were only present in a dry year, suggesting that environmental factors have consequences for the strength of carry-over effects. Our results also suggest that wet conditions at final winter sites may buffer the effects of poor staging conditions, at least in the short term, since individuals that staged in a dry year had higher scaled mass indices in Zambia than individuals that staged in a wet year. Conclusions This study provides a first insight into the connections between long-term migratory staging sites and final wintering sites, and suggests that local environmental factors can modify the strength of carry-over effects for long-distance migratory birds. | |
dc.identifier.apacitation | Sorensen, M. C., Fairhurst, G. D., Jenni-Eiermann, S., Newton, J., Yohannes, E., & Spottiswoode, C. N. (2016). Seasonal rainfall at long-term migratory staging sites is associated with altered carry-over effects in a Palearctic-African migratory bird. <i>BMC Ecology</i>, 16(1), 174 - 177. http://hdl.handle.net/11427/34251 | en_ZA |
dc.identifier.chicagocitation | Sorensen, Marjorie C, Graham D Fairhurst, Susanne Jenni-Eiermann, Jason Newton, Elizabeth Yohannes, and Claire N Spottiswoode "Seasonal rainfall at long-term migratory staging sites is associated with altered carry-over effects in a Palearctic-African migratory bird." <i>BMC Ecology</i> 16, 1. (2016): 174 - 177. http://hdl.handle.net/11427/34251 | en_ZA |
dc.identifier.citation | Sorensen, M.C., Fairhurst, G.D., Jenni-Eiermann, S., Newton, J., Yohannes, E. & Spottiswoode, C.N. 2016. Seasonal rainfall at long-term migratory staging sites is associated with altered carry-over effects in a Palearctic-African migratory bird. <i>BMC Ecology.</i> 16(1):174 - 177. http://hdl.handle.net/11427/34251 | en_ZA |
dc.identifier.issn | 1472-6785 | |
dc.identifier.ris | TY - Journal Article AU - Sorensen, Marjorie C AU - Fairhurst, Graham D AU - Jenni-Eiermann, Susanne AU - Newton, Jason AU - Yohannes, Elizabeth AU - Spottiswoode, Claire N AB - Abstract Background An understanding of year-round habitat use is essential for determining how carry-over effects shape population dynamics in long-distance migratory songbirds. The recent discovery of long-term migratory staging sites in many species, prior to arrival at final wintering sites, adds complexity to efforts to decipher non-breeding habitat use and connections between sites. We investigated whether habitat conditions during migratory staging carry over to influence great reed warbler (Acrocephalus arundinaceus) body condition at final wintering sites in Zambia. We asked whether the presence/absence and strength of such carry-over effects were modified by contrasting rainfall conditions during 2 years. Results First, we found that individuals staging in a dry year had higher corticosterone (CORT f ) and stable nitrogen isotope values (suggesting higher aridity) than birds staging in a wet year, indicating that regional weather affected staging conditions. Second, we found that carry-over effects from staging habitat conditions (measured via carbon and nitrogen isotopes) to final winter site body condition (measured via scaled mass index and β-hydroxybutyrate) were only present in a dry year, suggesting that environmental factors have consequences for the strength of carry-over effects. Our results also suggest that wet conditions at final winter sites may buffer the effects of poor staging conditions, at least in the short term, since individuals that staged in a dry year had higher scaled mass indices in Zambia than individuals that staged in a wet year. Conclusions This study provides a first insight into the connections between long-term migratory staging sites and final wintering sites, and suggests that local environmental factors can modify the strength of carry-over effects for long-distance migratory birds. DA - 2016 DB - OpenUCT DP - University of Cape Town IS - 1 J1 - BMC Ecology LK - https://open.uct.ac.za PY - 2016 SM - 1472-6785 T1 - Seasonal rainfall at long-term migratory staging sites is associated with altered carry-over effects in a Palearctic-African migratory bird TI - Seasonal rainfall at long-term migratory staging sites is associated with altered carry-over effects in a Palearctic-African migratory bird UR - http://hdl.handle.net/11427/34251 ER - | en_ZA |
dc.identifier.uri | http://hdl.handle.net/11427/34251 | |
dc.identifier.vancouvercitation | Sorensen MC, Fairhurst GD, Jenni-Eiermann S, Newton J, Yohannes E, Spottiswoode CN. Seasonal rainfall at long-term migratory staging sites is associated with altered carry-over effects in a Palearctic-African migratory bird. BMC Ecology. 2016;16(1):174 - 177. http://hdl.handle.net/11427/34251. | en_ZA |
dc.language.iso | eng | |
dc.publisher.department | Department of Biological Sciences | |
dc.publisher.faculty | Faculty of Science | |
dc.source | BMC Ecology | |
dc.source.journalissue | 1 | |
dc.source.journalvolume | 16 | |
dc.source.pagination | 174 - 177 | |
dc.source.uri | https://dx.doi.org/10.1186/s12898-016-0096-6 | |
dc.subject.other | Ecology | |
dc.subject.other | Life Sciences | |
dc.subject.other | general | |
dc.subject.other | rain | |
dc.subject.other | habitat preferences | |
dc.subject.other | habitats | |
dc.subject.other | dry environmental conditions | |
dc.subject.other | nitrogen | |
dc.subject.other | 3-hydroxybutyric acid | |
dc.subject.other | wintering grounds | |
dc.subject.other | Acrocephalus arundinaceus | |
dc.subject.other | migratory birds | |
dc.subject.other | population dynamics | |
dc.subject.other | body condition | |
dc.subject.other | carbon | |
dc.subject.other | isotopes | |
dc.subject.other | corticosterone | |
dc.subject.other | migratory behavior | |
dc.title | Seasonal rainfall at long-term migratory staging sites is associated with altered carry-over effects in a Palearctic-African migratory bird | |
dc.type | Journal Article | |
uct.type.publication | Research | |
uct.type.resource | Journal Article |
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