Persistent annual migration patterns of a specialist seabird
Specialization can make animals vulnerable to rapid environmental changes. For long-lived seabirds, foraging specialization may make individuals especially sensitive, as climatic changes are currently occurring over the course of one lifetime. The Bering Sea is a dynamic subarctic and arctic ecosyst...
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2018
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ftsanjosestate:oai:scholarworks.sjsu.edu:biol_pub-1114 2023-10-09T21:49:22+02:00 Persistent annual migration patterns of a specialist seabird Orben, Rachael Kokubun, Nobuo Fleishman, Abram Will, Alexis Yamamoto, Takashi Shaffer, Scott Paredes, Rosana Takahashi, Akinori Kitaysky, Alexander 2018-04-12T07:00:00Z application/pdf https://scholarworks.sjsu.edu/biol_pub/114 https://doi.org/10.3354/meps12459 https://scholarworks.sjsu.edu/context/biol_pub/article/1114/viewcontent/Shaffer_PersistentAnnualMigration_MEPS_2018_m593p231_stamped.pdf unknown SJSU ScholarWorks https://scholarworks.sjsu.edu/biol_pub/114 doi:10.3354/meps12459 https://scholarworks.sjsu.edu/context/biol_pub/article/1114/viewcontent/Shaffer_PersistentAnnualMigration_MEPS_2018_m593p231_stamped.pdf http://creativecommons.org/licenses/by/4.0/ Faculty Publications, Biological Sciences Feather corticosterone Life-history trade-off Geolocation Migration Net‑squared displacement Stable isotopes Red-legged kittiwake Rissa brevirostris Marine Biology Ornithology text 2018 ftsanjosestate https://doi.org/10.3354/meps12459 2023-09-11T18:08:51Z Specialization can make animals vulnerable to rapid environmental changes. For long-lived seabirds, foraging specialization may make individuals especially sensitive, as climatic changes are currently occurring over the course of one lifetime. The Bering Sea is a dynamic subarctic and arctic ecosystem where windblown sea ice mediates annual productivity and subsequent pathways to upper trophic levels. Red-legged kittiwakes Rissa brevirostris are endemic surface foraging seabirds specializing on myctophid fishes during reproduction. Their degree of specialization outside the breeding season is less understood. We examined their non-breeding ecology (migration, distribution, isotopic niche) during 4 winters with varying sea ice extent. Although we found annual variation in core distributions, diets (as reflected in feather stable isotope signatures), and outbound migratory timing, the winter range of red-legged kittiwakes was restricted to the western regions of the Bering Sea and North Pacific. Contrary to expectations, sea ice did not limit distributions in the Bering Sea in 3 yr: e.g. sea ice associations ( < 100 km) were infrequent (8.7% mo-1). Yet, their wintering range often overlapped with areas of seasonal ice cover, suggesting range-wide use of sea ice ecosystems. Stress levels measured by corticosterone in feathers were generally low. However, birds that concentrated in the Bering Sea in February had higher stress levels and fed at a lower trophic level than those in the western Aleutians and western subarctic. As conditions change, this persistence in wintering locations, while incurring differential stress levels, may contribute to rapid population fluctuations as has been observed in the recent past. Text Arctic Bering Sea Sea ice Subarctic San José State University: SJSU ScholarWorks Arctic Bering Sea Pacific Marine Ecology Progress Series 593 231 245 |
institution |
Open Polar |
collection |
San José State University: SJSU ScholarWorks |
op_collection_id |
ftsanjosestate |
language |
unknown |
topic |
Feather corticosterone Life-history trade-off Geolocation Migration Net‑squared displacement Stable isotopes Red-legged kittiwake Rissa brevirostris Marine Biology Ornithology |
spellingShingle |
Feather corticosterone Life-history trade-off Geolocation Migration Net‑squared displacement Stable isotopes Red-legged kittiwake Rissa brevirostris Marine Biology Ornithology Orben, Rachael Kokubun, Nobuo Fleishman, Abram Will, Alexis Yamamoto, Takashi Shaffer, Scott Paredes, Rosana Takahashi, Akinori Kitaysky, Alexander Persistent annual migration patterns of a specialist seabird |
topic_facet |
Feather corticosterone Life-history trade-off Geolocation Migration Net‑squared displacement Stable isotopes Red-legged kittiwake Rissa brevirostris Marine Biology Ornithology |
description |
Specialization can make animals vulnerable to rapid environmental changes. For long-lived seabirds, foraging specialization may make individuals especially sensitive, as climatic changes are currently occurring over the course of one lifetime. The Bering Sea is a dynamic subarctic and arctic ecosystem where windblown sea ice mediates annual productivity and subsequent pathways to upper trophic levels. Red-legged kittiwakes Rissa brevirostris are endemic surface foraging seabirds specializing on myctophid fishes during reproduction. Their degree of specialization outside the breeding season is less understood. We examined their non-breeding ecology (migration, distribution, isotopic niche) during 4 winters with varying sea ice extent. Although we found annual variation in core distributions, diets (as reflected in feather stable isotope signatures), and outbound migratory timing, the winter range of red-legged kittiwakes was restricted to the western regions of the Bering Sea and North Pacific. Contrary to expectations, sea ice did not limit distributions in the Bering Sea in 3 yr: e.g. sea ice associations ( < 100 km) were infrequent (8.7% mo-1). Yet, their wintering range often overlapped with areas of seasonal ice cover, suggesting range-wide use of sea ice ecosystems. Stress levels measured by corticosterone in feathers were generally low. However, birds that concentrated in the Bering Sea in February had higher stress levels and fed at a lower trophic level than those in the western Aleutians and western subarctic. As conditions change, this persistence in wintering locations, while incurring differential stress levels, may contribute to rapid population fluctuations as has been observed in the recent past. |
format |
Text |
author |
Orben, Rachael Kokubun, Nobuo Fleishman, Abram Will, Alexis Yamamoto, Takashi Shaffer, Scott Paredes, Rosana Takahashi, Akinori Kitaysky, Alexander |
author_facet |
Orben, Rachael Kokubun, Nobuo Fleishman, Abram Will, Alexis Yamamoto, Takashi Shaffer, Scott Paredes, Rosana Takahashi, Akinori Kitaysky, Alexander |
author_sort |
Orben, Rachael |
title |
Persistent annual migration patterns of a specialist seabird |
title_short |
Persistent annual migration patterns of a specialist seabird |
title_full |
Persistent annual migration patterns of a specialist seabird |
title_fullStr |
Persistent annual migration patterns of a specialist seabird |
title_full_unstemmed |
Persistent annual migration patterns of a specialist seabird |
title_sort |
persistent annual migration patterns of a specialist seabird |
publisher |
SJSU ScholarWorks |
publishDate |
2018 |
url |
https://scholarworks.sjsu.edu/biol_pub/114 https://doi.org/10.3354/meps12459 https://scholarworks.sjsu.edu/context/biol_pub/article/1114/viewcontent/Shaffer_PersistentAnnualMigration_MEPS_2018_m593p231_stamped.pdf |
geographic |
Arctic Bering Sea Pacific |
geographic_facet |
Arctic Bering Sea Pacific |
genre |
Arctic Bering Sea Sea ice Subarctic |
genre_facet |
Arctic Bering Sea Sea ice Subarctic |
op_source |
Faculty Publications, Biological Sciences |
op_relation |
https://scholarworks.sjsu.edu/biol_pub/114 doi:10.3354/meps12459 https://scholarworks.sjsu.edu/context/biol_pub/article/1114/viewcontent/Shaffer_PersistentAnnualMigration_MEPS_2018_m593p231_stamped.pdf |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3354/meps12459 |
container_title |
Marine Ecology Progress Series |
container_volume |
593 |
container_start_page |
231 |
op_container_end_page |
245 |
_version_ |
1779312380585443328 |