Body size affects individual winter foraging strategies of thick-billed murres in the Bering Sea
Foraging and migration often require different energetic and movement strategies. Though not readily apparent, constraints during one phase might influence the foraging strategies observed in another. For marine birds that fly and dive, body size constraints likely present a trade-off between foragi...
Published in: | Journal of Animal Ecology |
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2015
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Online Access: | https://scholarworks.sjsu.edu/biol_pub/89 https://doi.org/10.1111/1365-2656.12410 https://scholarworks.sjsu.edu/context/biol_pub/article/1089/viewcontent/ScottShaffer_BodySizeAffectsIndividualWinterForagingStrategies_JournalOfAnimalEcology_stamped.pdf |
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ftsanjosestate:oai:scholarworks.sjsu.edu:biol_pub-1089 2023-10-09T21:50:19+02:00 Body size affects individual winter foraging strategies of thick-billed murres in the Bering Sea Orben, Rachael Paredes, Rosana Roby, Daniel Irons, David Shaffer, Scott A. 2015-11-01T07:00:00Z application/pdf https://scholarworks.sjsu.edu/biol_pub/89 https://doi.org/10.1111/1365-2656.12410 https://scholarworks.sjsu.edu/context/biol_pub/article/1089/viewcontent/ScottShaffer_BodySizeAffectsIndividualWinterForagingStrategies_JournalOfAnimalEcology_stamped.pdf unknown SJSU ScholarWorks https://scholarworks.sjsu.edu/biol_pub/89 doi:10.1111/1365-2656.12410 https://scholarworks.sjsu.edu/context/biol_pub/article/1089/viewcontent/ScottShaffer_BodySizeAffectsIndividualWinterForagingStrategies_JournalOfAnimalEcology_stamped.pdf Faculty Publications, Biological Sciences geolocation foraging strategies marine habitats bering sea stable isotopes body size winter migration local adaption Uria lomvia Ecology and Evolutionary Biology text 2015 ftsanjosestate https://doi.org/10.1111/1365-2656.12410 2023-09-11T18:08:51Z Foraging and migration often require different energetic and movement strategies. Though not readily apparent, constraints during one phase might influence the foraging strategies observed in another. For marine birds that fly and dive, body size constraints likely present a trade-off between foraging ability and migration as smaller bodies reduce flight costs, whereas larger bodies are advantageous for diving deeper. This study examines individual wintering strategies of deep diving thick-billed murres (Uria lomvia) breeding at three colonies in the south-eastern Bering Sea: St Paul, St George and Bogoslof. These colonies, arranged north to south, are located such that breeding birds forage in a gradient from shelf to deep-water habitats. We used geolocation time-depth recorders and stable isotopes from feathers to determine differences in foraging behaviour and diet of murres during three non-breeding periods, 2008–2011. Body size was quantified by a principal component analysis (wing, culmen, head+bill and tarsus length). A hierarchical cluster analysis identified winter foraging strategies based on individual movement, diving behaviour and diet (inferred from stable isotopes). Structural body size differed by breeding island. Larger birds from St Paul had higher wing loading than smaller birds from St George. Larger birds, mainly from St Paul, dove to deeper depths, spent more time in the Bering Sea, and likely consumed higher trophic-level prey in late winter. Three winter foraging strategies were identified. The main strategy, employed by small birds from all three breeding colonies in the first 2 years, was characterized by high residency areas in the North Pacific south of the Aleutians and nocturnal diving. In contrast, 31% of birds from St Paul remained in the Bering Sea and foraged mainly during the day, apparently feeding on higher trophic-level prey. Throat feather stable isotopes indicated that individuals exhibited flexibility in the use of this colony-specific foraging strategy. The third ... Text Bering Sea Uria lomvia uria San José State University: SJSU ScholarWorks Bering Sea Pacific Journal of Animal Ecology 84 6 1589 1599 |
institution |
Open Polar |
collection |
San José State University: SJSU ScholarWorks |
op_collection_id |
ftsanjosestate |
language |
unknown |
topic |
geolocation foraging strategies marine habitats bering sea stable isotopes body size winter migration local adaption Uria lomvia Ecology and Evolutionary Biology |
spellingShingle |
geolocation foraging strategies marine habitats bering sea stable isotopes body size winter migration local adaption Uria lomvia Ecology and Evolutionary Biology Orben, Rachael Paredes, Rosana Roby, Daniel Irons, David Shaffer, Scott A. Body size affects individual winter foraging strategies of thick-billed murres in the Bering Sea |
topic_facet |
geolocation foraging strategies marine habitats bering sea stable isotopes body size winter migration local adaption Uria lomvia Ecology and Evolutionary Biology |
description |
Foraging and migration often require different energetic and movement strategies. Though not readily apparent, constraints during one phase might influence the foraging strategies observed in another. For marine birds that fly and dive, body size constraints likely present a trade-off between foraging ability and migration as smaller bodies reduce flight costs, whereas larger bodies are advantageous for diving deeper. This study examines individual wintering strategies of deep diving thick-billed murres (Uria lomvia) breeding at three colonies in the south-eastern Bering Sea: St Paul, St George and Bogoslof. These colonies, arranged north to south, are located such that breeding birds forage in a gradient from shelf to deep-water habitats. We used geolocation time-depth recorders and stable isotopes from feathers to determine differences in foraging behaviour and diet of murres during three non-breeding periods, 2008–2011. Body size was quantified by a principal component analysis (wing, culmen, head+bill and tarsus length). A hierarchical cluster analysis identified winter foraging strategies based on individual movement, diving behaviour and diet (inferred from stable isotopes). Structural body size differed by breeding island. Larger birds from St Paul had higher wing loading than smaller birds from St George. Larger birds, mainly from St Paul, dove to deeper depths, spent more time in the Bering Sea, and likely consumed higher trophic-level prey in late winter. Three winter foraging strategies were identified. The main strategy, employed by small birds from all three breeding colonies in the first 2 years, was characterized by high residency areas in the North Pacific south of the Aleutians and nocturnal diving. In contrast, 31% of birds from St Paul remained in the Bering Sea and foraged mainly during the day, apparently feeding on higher trophic-level prey. Throat feather stable isotopes indicated that individuals exhibited flexibility in the use of this colony-specific foraging strategy. The third ... |
format |
Text |
author |
Orben, Rachael Paredes, Rosana Roby, Daniel Irons, David Shaffer, Scott A. |
author_facet |
Orben, Rachael Paredes, Rosana Roby, Daniel Irons, David Shaffer, Scott A. |
author_sort |
Orben, Rachael |
title |
Body size affects individual winter foraging strategies of thick-billed murres in the Bering Sea |
title_short |
Body size affects individual winter foraging strategies of thick-billed murres in the Bering Sea |
title_full |
Body size affects individual winter foraging strategies of thick-billed murres in the Bering Sea |
title_fullStr |
Body size affects individual winter foraging strategies of thick-billed murres in the Bering Sea |
title_full_unstemmed |
Body size affects individual winter foraging strategies of thick-billed murres in the Bering Sea |
title_sort |
body size affects individual winter foraging strategies of thick-billed murres in the bering sea |
publisher |
SJSU ScholarWorks |
publishDate |
2015 |
url |
https://scholarworks.sjsu.edu/biol_pub/89 https://doi.org/10.1111/1365-2656.12410 https://scholarworks.sjsu.edu/context/biol_pub/article/1089/viewcontent/ScottShaffer_BodySizeAffectsIndividualWinterForagingStrategies_JournalOfAnimalEcology_stamped.pdf |
geographic |
Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
Bering Sea Uria lomvia uria |
genre_facet |
Bering Sea Uria lomvia uria |
op_source |
Faculty Publications, Biological Sciences |
op_relation |
https://scholarworks.sjsu.edu/biol_pub/89 doi:10.1111/1365-2656.12410 https://scholarworks.sjsu.edu/context/biol_pub/article/1089/viewcontent/ScottShaffer_BodySizeAffectsIndividualWinterForagingStrategies_JournalOfAnimalEcology_stamped.pdf |
op_doi |
https://doi.org/10.1111/1365-2656.12410 |
container_title |
Journal of Animal Ecology |
container_volume |
84 |
container_issue |
6 |
container_start_page |
1589 |
op_container_end_page |
1599 |
_version_ |
1779313370479984640 |