Distribution of foraging shearwaters relative to inner front of SE Bering Sea
We examined the hypothesis that short-tailed shearwaters Puffin us tenuirostris aggregate to forage at the inner front of the SE Bering Sea because of enhanced production there. We tested this hypothesis by comparing primary production, the distribution of euphausiids and the distribution of shearwa...
Published in: | Marine Ecology Progress Series |
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2005
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Online Access: | https://escholarship.org/uc/item/1df8q0f0 https://escholarship.org/content/qt1df8q0f0/qt1df8q0f0.pdf https://doi.org/10.3354/meps305219 |
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ftcdlib:oai:escholarship.org:ark:/13030/qt1df8q0f0 2024-09-15T17:59:28+00:00 Distribution of foraging shearwaters relative to inner front of SE Bering Sea Jahncke, J Coyle, KO Zeeman, SI Kachel, NB Hunt, GL 2005-01-01 application/pdf https://escholarship.org/uc/item/1df8q0f0 https://escholarship.org/content/qt1df8q0f0/qt1df8q0f0.pdf https://doi.org/10.3354/meps305219 unknown eScholarship, University of California qt1df8q0f0 https://escholarship.org/uc/item/1df8q0f0 https://escholarship.org/content/qt1df8q0f0/qt1df8q0f0.pdf doi:10.3354/meps305219 CC-BY short-tailed shearwater Puffinus tenuirostris euphausiids Thysanoessa raschii Thysanoessa inermis seabird foraging fronts Bering Sea Oceanography Ecology Zoology Marine Biology & Hydrobiology article 2005 ftcdlib https://doi.org/10.3354/meps305219 2024-06-28T06:28:20Z We examined the hypothesis that short-tailed shearwaters Puffin us tenuirostris aggregate to forage at the inner front of the SE Bering Sea because of enhanced production there. We tested this hypothesis by comparing primary production, the distribution of euphausiids and the distribution of shearwaters relative to the front during late spring and late summer/early fall of 1997, 1998 and 1999. We found enhanced primary production at the front and offshore of the front during summer but not during spring. Primary production varied between seasons and years. Major differences were related to anomalous conditions in 1997 and 1998. The density of euphausiids was higher at the front and offshore of the front during summer, but there were no differences among regions during spring. Foraging shearwaters aggregated in high densities at the front during summer, but foraged close to shore during spring. At the front, shearwaters foraged on euphausiids Thysanoessa raschii and T. inermis as expected, and on copepods that accumulated in the area. The proportion of zooplankton consumed at the front decreased from summer 1997 to summer 1999, while consumption of sandlance Ammodytes hexapterus at this feature increased. Our results show that, during summer, the inner front supports aggregations of euphausiids and their seabird predators. The means by which the frontal system supports enhanced production and the subseguent trophic transfers is dependent on the availability of nutrients at depth in the frontal region and the aggregation of small zooplankton organisms in this feature. © Inter-Research 2005. Article in Journal/Newspaper Bering Sea Puffinus tenuirostris Thysanoessa raschii Copepods Thysanoessa inermis University of California: eScholarship Marine Ecology Progress Series 305 219 233 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
short-tailed shearwater Puffinus tenuirostris euphausiids Thysanoessa raschii Thysanoessa inermis seabird foraging fronts Bering Sea Oceanography Ecology Zoology Marine Biology & Hydrobiology |
spellingShingle |
short-tailed shearwater Puffinus tenuirostris euphausiids Thysanoessa raschii Thysanoessa inermis seabird foraging fronts Bering Sea Oceanography Ecology Zoology Marine Biology & Hydrobiology Jahncke, J Coyle, KO Zeeman, SI Kachel, NB Hunt, GL Distribution of foraging shearwaters relative to inner front of SE Bering Sea |
topic_facet |
short-tailed shearwater Puffinus tenuirostris euphausiids Thysanoessa raschii Thysanoessa inermis seabird foraging fronts Bering Sea Oceanography Ecology Zoology Marine Biology & Hydrobiology |
description |
We examined the hypothesis that short-tailed shearwaters Puffin us tenuirostris aggregate to forage at the inner front of the SE Bering Sea because of enhanced production there. We tested this hypothesis by comparing primary production, the distribution of euphausiids and the distribution of shearwaters relative to the front during late spring and late summer/early fall of 1997, 1998 and 1999. We found enhanced primary production at the front and offshore of the front during summer but not during spring. Primary production varied between seasons and years. Major differences were related to anomalous conditions in 1997 and 1998. The density of euphausiids was higher at the front and offshore of the front during summer, but there were no differences among regions during spring. Foraging shearwaters aggregated in high densities at the front during summer, but foraged close to shore during spring. At the front, shearwaters foraged on euphausiids Thysanoessa raschii and T. inermis as expected, and on copepods that accumulated in the area. The proportion of zooplankton consumed at the front decreased from summer 1997 to summer 1999, while consumption of sandlance Ammodytes hexapterus at this feature increased. Our results show that, during summer, the inner front supports aggregations of euphausiids and their seabird predators. The means by which the frontal system supports enhanced production and the subseguent trophic transfers is dependent on the availability of nutrients at depth in the frontal region and the aggregation of small zooplankton organisms in this feature. © Inter-Research 2005. |
format |
Article in Journal/Newspaper |
author |
Jahncke, J Coyle, KO Zeeman, SI Kachel, NB Hunt, GL |
author_facet |
Jahncke, J Coyle, KO Zeeman, SI Kachel, NB Hunt, GL |
author_sort |
Jahncke, J |
title |
Distribution of foraging shearwaters relative to inner front of SE Bering Sea |
title_short |
Distribution of foraging shearwaters relative to inner front of SE Bering Sea |
title_full |
Distribution of foraging shearwaters relative to inner front of SE Bering Sea |
title_fullStr |
Distribution of foraging shearwaters relative to inner front of SE Bering Sea |
title_full_unstemmed |
Distribution of foraging shearwaters relative to inner front of SE Bering Sea |
title_sort |
distribution of foraging shearwaters relative to inner front of se bering sea |
publisher |
eScholarship, University of California |
publishDate |
2005 |
url |
https://escholarship.org/uc/item/1df8q0f0 https://escholarship.org/content/qt1df8q0f0/qt1df8q0f0.pdf https://doi.org/10.3354/meps305219 |
genre |
Bering Sea Puffinus tenuirostris Thysanoessa raschii Copepods Thysanoessa inermis |
genre_facet |
Bering Sea Puffinus tenuirostris Thysanoessa raschii Copepods Thysanoessa inermis |
op_relation |
qt1df8q0f0 https://escholarship.org/uc/item/1df8q0f0 https://escholarship.org/content/qt1df8q0f0/qt1df8q0f0.pdf doi:10.3354/meps305219 |
op_rights |
CC-BY |
op_doi |
https://doi.org/10.3354/meps305219 |
container_title |
Marine Ecology Progress Series |
container_volume |
305 |
container_start_page |
219 |
op_container_end_page |
233 |
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1810436573039165440 |