Annual variation in great skua diets: the importance of commercial fisheries and predation on seabirds revealed by combining dietary analyses
This study combines conventional dietary assessment with stable isotope techniques to describe Great Skua (Stercorarius skua) diet. Stable carbon and nitrogen isotope ratios in feathers of Great Skua chicks collected over three years were analyzed in conjunction with pellet and regurgitate collectio...
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Cooper Ornithological Society
2001
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ftnerc:oai:nora.nerc.ac.uk:18374 2023-05-15T16:23:01+02:00 Annual variation in great skua diets: the importance of commercial fisheries and predation on seabirds revealed by combining dietary analyses Bearhop, Stuart Thompson, David R. Phillips, Richard A. Waldron, Susan Hamer, Keith C. Gray, Catherine M. Votier, Stephen C. Ross, Ben P. Furness, Robert W. 2001 http://nora.nerc.ac.uk/id/eprint/18374/ http://www.bioone.org/doi/abs/10.1650/0010-5422%282001%29103%5B0802%3AAVIGSD%5D2.0.CO%3B2 unknown Cooper Ornithological Society Bearhop, Stuart; Thompson, David R.; Phillips, Richard A.; Waldron, Susan; Hamer, Keith C.; Gray, Catherine M.; Votier, Stephen C.; Ross, Ben P.; Furness, Robert W. 2001 Annual variation in great skua diets: the importance of commercial fisheries and predation on seabirds revealed by combining dietary analyses. Condor, 103 (4). 802-809. https://doi.org/10.1650/0010-5422(2001)103[0802:AVIGSD]2.0.CO;2 <https://doi.org/10.1650/0010-5422(2001)103[0802:AVIGSD]2.0.CO;2> Publication - Article PeerReviewed 2001 ftnerc https://doi.org/10.1650/0010-5422(2001)103[0802:AVIGSD]2.0.CO;2 2023-02-04T19:31:42Z This study combines conventional dietary assessment with stable isotope techniques to describe Great Skua (Stercorarius skua) diet. Stable carbon and nitrogen isotope ratios in feathers of Great Skua chicks collected over three years were analyzed in conjunction with pellet and regurgitate collections. A significant drop in trophic status was detected in 1997, which likely resulted from an increase in herring and mackerel in the diet. These items were almost certainly obtained from a commercial trawler, as evidenced by a significant drop in territorial attendance during the ship's absence. Feathers yielded significantly different δ13C values among years, and part of this may have been related to a period of enhanced phytoplankton growth during 1996. A combined approach, such as the one described here, is likely to become increasingly useful in elucidating the diets of polyphagous birds. Article in Journal/Newspaper Great skua Stercorarius skua Natural Environment Research Council: NERC Open Research Archive |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
This study combines conventional dietary assessment with stable isotope techniques to describe Great Skua (Stercorarius skua) diet. Stable carbon and nitrogen isotope ratios in feathers of Great Skua chicks collected over three years were analyzed in conjunction with pellet and regurgitate collections. A significant drop in trophic status was detected in 1997, which likely resulted from an increase in herring and mackerel in the diet. These items were almost certainly obtained from a commercial trawler, as evidenced by a significant drop in territorial attendance during the ship's absence. Feathers yielded significantly different δ13C values among years, and part of this may have been related to a period of enhanced phytoplankton growth during 1996. A combined approach, such as the one described here, is likely to become increasingly useful in elucidating the diets of polyphagous birds. |
format |
Article in Journal/Newspaper |
author |
Bearhop, Stuart Thompson, David R. Phillips, Richard A. Waldron, Susan Hamer, Keith C. Gray, Catherine M. Votier, Stephen C. Ross, Ben P. Furness, Robert W. |
spellingShingle |
Bearhop, Stuart Thompson, David R. Phillips, Richard A. Waldron, Susan Hamer, Keith C. Gray, Catherine M. Votier, Stephen C. Ross, Ben P. Furness, Robert W. Annual variation in great skua diets: the importance of commercial fisheries and predation on seabirds revealed by combining dietary analyses |
author_facet |
Bearhop, Stuart Thompson, David R. Phillips, Richard A. Waldron, Susan Hamer, Keith C. Gray, Catherine M. Votier, Stephen C. Ross, Ben P. Furness, Robert W. |
author_sort |
Bearhop, Stuart |
title |
Annual variation in great skua diets: the importance of commercial fisheries and predation on seabirds revealed by combining dietary analyses |
title_short |
Annual variation in great skua diets: the importance of commercial fisheries and predation on seabirds revealed by combining dietary analyses |
title_full |
Annual variation in great skua diets: the importance of commercial fisheries and predation on seabirds revealed by combining dietary analyses |
title_fullStr |
Annual variation in great skua diets: the importance of commercial fisheries and predation on seabirds revealed by combining dietary analyses |
title_full_unstemmed |
Annual variation in great skua diets: the importance of commercial fisheries and predation on seabirds revealed by combining dietary analyses |
title_sort |
annual variation in great skua diets: the importance of commercial fisheries and predation on seabirds revealed by combining dietary analyses |
publisher |
Cooper Ornithological Society |
publishDate |
2001 |
url |
http://nora.nerc.ac.uk/id/eprint/18374/ http://www.bioone.org/doi/abs/10.1650/0010-5422%282001%29103%5B0802%3AAVIGSD%5D2.0.CO%3B2 |
genre |
Great skua Stercorarius skua |
genre_facet |
Great skua Stercorarius skua |
op_relation |
Bearhop, Stuart; Thompson, David R.; Phillips, Richard A.; Waldron, Susan; Hamer, Keith C.; Gray, Catherine M.; Votier, Stephen C.; Ross, Ben P.; Furness, Robert W. 2001 Annual variation in great skua diets: the importance of commercial fisheries and predation on seabirds revealed by combining dietary analyses. Condor, 103 (4). 802-809. https://doi.org/10.1650/0010-5422(2001)103[0802:AVIGSD]2.0.CO;2 <https://doi.org/10.1650/0010-5422(2001)103[0802:AVIGSD]2.0.CO;2> |
op_doi |
https://doi.org/10.1650/0010-5422(2001)103[0802:AVIGSD]2.0.CO;2 |
_version_ |
1766011165666705408 |