Thick-billed murres and black guillemots in the Barrow Strait area, N.W.T., during spring: diets and food availability along ice edges
From 5 June to 4 July 1976, I collected 98 thick-billed murres (Uria lomvia) and 47 black guillemots (Cepphus grylle) at ice edges in Barrow Strait, N.W.T., for diet studies. Alcids were collected at coastal ice edges and at the edges of landfast ice farther offshore; in both habitats food availabil...
Published in: | Canadian Journal of Zoology |
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Language: | English |
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Canadian Science Publishing
1980
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Online Access: | http://dx.doi.org/10.1139/z80-292 http://www.nrcresearchpress.com/doi/pdf/10.1139/z80-292 |
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crcansciencepubl:10.1139/z80-292 2024-06-23T07:48:57+00:00 Thick-billed murres and black guillemots in the Barrow Strait area, N.W.T., during spring: diets and food availability along ice edges Bradstreet, Michael S. W. 1980 http://dx.doi.org/10.1139/z80-292 http://www.nrcresearchpress.com/doi/pdf/10.1139/z80-292 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 58, issue 11, page 2120-2140 ISSN 0008-4301 1480-3283 journal-article 1980 crcansciencepubl https://doi.org/10.1139/z80-292 2024-06-06T04:11:16Z From 5 June to 4 July 1976, I collected 98 thick-billed murres (Uria lomvia) and 47 black guillemots (Cepphus grylle) at ice edges in Barrow Strait, N.W.T., for diet studies. Alcids were collected at coastal ice edges and at the edges of landfast ice farther offshore; in both habitats food availability was also studied. At coastal ice edges, murre diet was dominated by Arctic cod (Boreogadus saida, 14% of dry weight biomass) and the amphipod Onisimus litoralis (18%); guillemot diet was dominated by cod (99%), decapods (0.4%), and amphipods (0.2%). At offshore ice edges murres took cod (96%), Parathemisto (2%), and Onisimus glacialis (2%); guillemots took cod (54%), O. glacialis (35%), and Apherusa glacialis (5%). Morisita's overlap values showed that diets of these two alcids were more similar at offshore than at coastal ice edges and that there were considerable habitat-related differences in diet. Data on food availability suggested that at offshore ice edges, murres were feeding in the water column and at the undersurface of the landfast ice; guillemots fed almost solely at the ice undersurface. At coastal ice edges, both alcids were probably feeding at the ice undersurface and on the sea bottom; in addition, murres fed in the water column. The importance of epontic (= ice-associated) fauna in the diets of alcids during spring is discussed. Article in Journal/Newspaper Arctic cod Arctic Boreogadus saida Cepphus grylle Uria lomvia uria Canadian Science Publishing Arctic Barrow Strait ENVELOPE(-94.168,-94.168,74.402,74.402) Canadian Journal of Zoology 58 11 2120 2140 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
From 5 June to 4 July 1976, I collected 98 thick-billed murres (Uria lomvia) and 47 black guillemots (Cepphus grylle) at ice edges in Barrow Strait, N.W.T., for diet studies. Alcids were collected at coastal ice edges and at the edges of landfast ice farther offshore; in both habitats food availability was also studied. At coastal ice edges, murre diet was dominated by Arctic cod (Boreogadus saida, 14% of dry weight biomass) and the amphipod Onisimus litoralis (18%); guillemot diet was dominated by cod (99%), decapods (0.4%), and amphipods (0.2%). At offshore ice edges murres took cod (96%), Parathemisto (2%), and Onisimus glacialis (2%); guillemots took cod (54%), O. glacialis (35%), and Apherusa glacialis (5%). Morisita's overlap values showed that diets of these two alcids were more similar at offshore than at coastal ice edges and that there were considerable habitat-related differences in diet. Data on food availability suggested that at offshore ice edges, murres were feeding in the water column and at the undersurface of the landfast ice; guillemots fed almost solely at the ice undersurface. At coastal ice edges, both alcids were probably feeding at the ice undersurface and on the sea bottom; in addition, murres fed in the water column. The importance of epontic (= ice-associated) fauna in the diets of alcids during spring is discussed. |
format |
Article in Journal/Newspaper |
author |
Bradstreet, Michael S. W. |
spellingShingle |
Bradstreet, Michael S. W. Thick-billed murres and black guillemots in the Barrow Strait area, N.W.T., during spring: diets and food availability along ice edges |
author_facet |
Bradstreet, Michael S. W. |
author_sort |
Bradstreet, Michael S. W. |
title |
Thick-billed murres and black guillemots in the Barrow Strait area, N.W.T., during spring: diets and food availability along ice edges |
title_short |
Thick-billed murres and black guillemots in the Barrow Strait area, N.W.T., during spring: diets and food availability along ice edges |
title_full |
Thick-billed murres and black guillemots in the Barrow Strait area, N.W.T., during spring: diets and food availability along ice edges |
title_fullStr |
Thick-billed murres and black guillemots in the Barrow Strait area, N.W.T., during spring: diets and food availability along ice edges |
title_full_unstemmed |
Thick-billed murres and black guillemots in the Barrow Strait area, N.W.T., during spring: diets and food availability along ice edges |
title_sort |
thick-billed murres and black guillemots in the barrow strait area, n.w.t., during spring: diets and food availability along ice edges |
publisher |
Canadian Science Publishing |
publishDate |
1980 |
url |
http://dx.doi.org/10.1139/z80-292 http://www.nrcresearchpress.com/doi/pdf/10.1139/z80-292 |
long_lat |
ENVELOPE(-94.168,-94.168,74.402,74.402) |
geographic |
Arctic Barrow Strait |
geographic_facet |
Arctic Barrow Strait |
genre |
Arctic cod Arctic Boreogadus saida Cepphus grylle Uria lomvia uria |
genre_facet |
Arctic cod Arctic Boreogadus saida Cepphus grylle Uria lomvia uria |
op_source |
Canadian Journal of Zoology volume 58, issue 11, page 2120-2140 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z80-292 |
container_title |
Canadian Journal of Zoology |
container_volume |
58 |
container_issue |
11 |
container_start_page |
2120 |
op_container_end_page |
2140 |
_version_ |
1802639252230504448 |