Foraging segregation of two congeneric diving seabird species breeding on St. George Island, Bering Sea
Subarctic environmental changes are expected to affect the foraging ecology of marine top predators, but the response to such changes may vary among species if they use food resources differently. We examined the characteristics of foraging behavior of two sympatric congeneric diving seabird: common...
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Copernicus Publications
2016
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00013507 2023-05-15T15:43:29+02:00 Foraging segregation of two congeneric diving seabird species breeding on St. George Island, Bering Sea Kokubun, Nobuo Yamamoto, Takashi Sato, Nobuhiko Watanuki, Yutaka Will, Alexis Kitaysky, Alexander S. Takahashi, Akinori 2016-04 electronic https://doi.org/10.5194/bg-13-2579-2016 https://noa.gwlb.de/receive/cop_mods_00013507 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013463/bg-13-2579-2016.pdf https://bg.copernicus.org/articles/13/2579/2016/bg-13-2579-2016.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-13-2579-2016 https://noa.gwlb.de/receive/cop_mods_00013507 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013463/bg-13-2579-2016.pdf https://bg.copernicus.org/articles/13/2579/2016/bg-13-2579-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/bg-13-2579-2016 2022-02-08T22:55:33Z Subarctic environmental changes are expected to affect the foraging ecology of marine top predators, but the response to such changes may vary among species if they use food resources differently. We examined the characteristics of foraging behavior of two sympatric congeneric diving seabird: common (Uria aalge: hereafter COMUs) and thick-billed (U. lomvia: hereafter TBMUs) murres breeding on St. George Island, located in the seasonal sea-ice region of the Bering Sea. We investigated their foraging trip and flight durations, diel patterns of dive depth, and underwater wing strokes, along with wing morphology and blood stable isotope signatures and stress hormones. Acceleration–temperature–depth loggers were attached to chick-guarding birds, and data were obtained from 7 COMUs and 12 TBMUs. Both species showed similar mean trip duration (13.2 h for COMUs and 10.5 h for TBMUs) and similar diurnal patterns of diving (frequent dives to various depths in the daytime and less frequent dives to shallow depths in the nighttime). During the daytime, the dive depths of COMUs had two peaks in shallow (18.1 m) and deep (74.2 m) depths, while those of TBMUs were 20.2 m and 59.7 m. COMUs showed more frequent wing strokes during the bottom phase of dives (1.90 s−1) than TBMUs (1.66 s−1). Fish occurred more frequently in the bill loads of COMUs (85 %) than those of TBMUs (56 %). The δ15N value of blood was significantly higher in COMUs (14.5 ‰) than in TBMUs (13.1 ‰). The relatively small wing area (0.053 m2) of COMUs compared to TBMUs (0.067 m2) may facilitate their increased agility while foraging and allow them to capture more mobile prey such as larger fishes that inhabit deeper depths. These differences in food resource use may lead to the differential responses of the two murre species to marine environmental changes in the Bering Sea. Article in Journal/Newspaper Bering Sea Sea ice Subarctic Uria aalge uria Niedersächsisches Online-Archiv NOA Bering Sea Biogeosciences 13 8 2579 2591 |
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Niedersächsisches Online-Archiv NOA |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Kokubun, Nobuo Yamamoto, Takashi Sato, Nobuhiko Watanuki, Yutaka Will, Alexis Kitaysky, Alexander S. Takahashi, Akinori Foraging segregation of two congeneric diving seabird species breeding on St. George Island, Bering Sea |
topic_facet |
article Verlagsveröffentlichung |
description |
Subarctic environmental changes are expected to affect the foraging ecology of marine top predators, but the response to such changes may vary among species if they use food resources differently. We examined the characteristics of foraging behavior of two sympatric congeneric diving seabird: common (Uria aalge: hereafter COMUs) and thick-billed (U. lomvia: hereafter TBMUs) murres breeding on St. George Island, located in the seasonal sea-ice region of the Bering Sea. We investigated their foraging trip and flight durations, diel patterns of dive depth, and underwater wing strokes, along with wing morphology and blood stable isotope signatures and stress hormones. Acceleration–temperature–depth loggers were attached to chick-guarding birds, and data were obtained from 7 COMUs and 12 TBMUs. Both species showed similar mean trip duration (13.2 h for COMUs and 10.5 h for TBMUs) and similar diurnal patterns of diving (frequent dives to various depths in the daytime and less frequent dives to shallow depths in the nighttime). During the daytime, the dive depths of COMUs had two peaks in shallow (18.1 m) and deep (74.2 m) depths, while those of TBMUs were 20.2 m and 59.7 m. COMUs showed more frequent wing strokes during the bottom phase of dives (1.90 s−1) than TBMUs (1.66 s−1). Fish occurred more frequently in the bill loads of COMUs (85 %) than those of TBMUs (56 %). The δ15N value of blood was significantly higher in COMUs (14.5 ‰) than in TBMUs (13.1 ‰). The relatively small wing area (0.053 m2) of COMUs compared to TBMUs (0.067 m2) may facilitate their increased agility while foraging and allow them to capture more mobile prey such as larger fishes that inhabit deeper depths. These differences in food resource use may lead to the differential responses of the two murre species to marine environmental changes in the Bering Sea. |
format |
Article in Journal/Newspaper |
author |
Kokubun, Nobuo Yamamoto, Takashi Sato, Nobuhiko Watanuki, Yutaka Will, Alexis Kitaysky, Alexander S. Takahashi, Akinori |
author_facet |
Kokubun, Nobuo Yamamoto, Takashi Sato, Nobuhiko Watanuki, Yutaka Will, Alexis Kitaysky, Alexander S. Takahashi, Akinori |
author_sort |
Kokubun, Nobuo |
title |
Foraging segregation of two congeneric diving seabird species breeding on St. George Island, Bering Sea |
title_short |
Foraging segregation of two congeneric diving seabird species breeding on St. George Island, Bering Sea |
title_full |
Foraging segregation of two congeneric diving seabird species breeding on St. George Island, Bering Sea |
title_fullStr |
Foraging segregation of two congeneric diving seabird species breeding on St. George Island, Bering Sea |
title_full_unstemmed |
Foraging segregation of two congeneric diving seabird species breeding on St. George Island, Bering Sea |
title_sort |
foraging segregation of two congeneric diving seabird species breeding on st. george island, bering sea |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/bg-13-2579-2016 https://noa.gwlb.de/receive/cop_mods_00013507 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013463/bg-13-2579-2016.pdf https://bg.copernicus.org/articles/13/2579/2016/bg-13-2579-2016.pdf |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea Sea ice Subarctic Uria aalge uria |
genre_facet |
Bering Sea Sea ice Subarctic Uria aalge uria |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-13-2579-2016 https://noa.gwlb.de/receive/cop_mods_00013507 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013463/bg-13-2579-2016.pdf https://bg.copernicus.org/articles/13/2579/2016/bg-13-2579-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-13-2579-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
8 |
container_start_page |
2579 |
op_container_end_page |
2591 |
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1766377654294937600 |