Diet of harp seals ( Phoca groenlandica ) in nearshore waters of the northwest Atlantic during 1990 – 1993
The nearshore diet of northwest Atlantic harp seals (Phoca groenlandica) was determined by reconstructing the contents of 1167 prey-containing stomachs (78.3% of 1490) collected from 1990 to 1993. Although harp seals consumed at least 62 species, 6 accounted for most of the mass consumed and their r...
Published in: | Canadian Journal of Zoology |
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Language: | English |
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Canadian Science Publishing
1995
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Online Access: | http://dx.doi.org/10.1139/z95-213 http://www.nrcresearchpress.com/doi/pdf/10.1139/z95-213 |
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crcansciencepubl:10.1139/z95-213 2024-04-07T07:48:58+00:00 Diet of harp seals ( Phoca groenlandica ) in nearshore waters of the northwest Atlantic during 1990 – 1993 Lawson, John W. Stenson, Garry B. McKinnon, Dave G. 1995 http://dx.doi.org/10.1139/z95-213 http://www.nrcresearchpress.com/doi/pdf/10.1139/z95-213 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 73, issue 10, page 1805-1818 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1995 crcansciencepubl https://doi.org/10.1139/z95-213 2024-03-08T00:37:43Z The nearshore diet of northwest Atlantic harp seals (Phoca groenlandica) was determined by reconstructing the contents of 1167 prey-containing stomachs (78.3% of 1490) collected from 1990 to 1993. Although harp seals consumed at least 62 species, 6 accounted for most of the mass consumed and their relative importance varied by area. Based on percent wet mass, sculpins (Cottidae) and Arctic cod (Boreogadus saida) were the main components of the diet of older seals (> 1 year old) off Labrador, whereas Arctic cod and Atlantic herring (Clupea harengus) were the main prey of seals from northeastern Newfoundland. A more diverse diet was observed in seals taken off the west coast of Newfoundland, where capelin (Mallotus villosus), herring, Atlantic cod (Gadus morhua), redfish (Sebastes spp.), and Arctic cod were the main species. Redfish and Atlantic cod were important to seals along the south coast of Newfoundland. Eighty percent of fish consumed were less than 18 cm long, smaller than those taken by commercial fisheries. Pups (less than 1 year old) consumed fewer and smaller prey of a less varied assortment. Annual and seasonal variation in the diets was observed in the collection from northeastern Newfoundland. Arctic cod was the major prey consumed throughout the year by seals of all ages, although the relative importance of herring, capelin, and squid (Teuthoidea) increased during the summer. Invertebrates and capelin made up a greater proportion of the diet in 1992, owing to a decline in consumption of Arctic cod. This finding was associated with a decrease in the mass of stomach contents. Diet diversity did not change significantly over the study period. Article in Journal/Newspaper Arctic cod Arctic atlantic cod Boreogadus saida Gadus morhua Newfoundland Northwest Atlantic Phoca groenlandica Canadian Science Publishing Arctic Newfoundland Canadian Journal of Zoology 73 10 1805 1818 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Lawson, John W. Stenson, Garry B. McKinnon, Dave G. Diet of harp seals ( Phoca groenlandica ) in nearshore waters of the northwest Atlantic during 1990 – 1993 |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
The nearshore diet of northwest Atlantic harp seals (Phoca groenlandica) was determined by reconstructing the contents of 1167 prey-containing stomachs (78.3% of 1490) collected from 1990 to 1993. Although harp seals consumed at least 62 species, 6 accounted for most of the mass consumed and their relative importance varied by area. Based on percent wet mass, sculpins (Cottidae) and Arctic cod (Boreogadus saida) were the main components of the diet of older seals (> 1 year old) off Labrador, whereas Arctic cod and Atlantic herring (Clupea harengus) were the main prey of seals from northeastern Newfoundland. A more diverse diet was observed in seals taken off the west coast of Newfoundland, where capelin (Mallotus villosus), herring, Atlantic cod (Gadus morhua), redfish (Sebastes spp.), and Arctic cod were the main species. Redfish and Atlantic cod were important to seals along the south coast of Newfoundland. Eighty percent of fish consumed were less than 18 cm long, smaller than those taken by commercial fisheries. Pups (less than 1 year old) consumed fewer and smaller prey of a less varied assortment. Annual and seasonal variation in the diets was observed in the collection from northeastern Newfoundland. Arctic cod was the major prey consumed throughout the year by seals of all ages, although the relative importance of herring, capelin, and squid (Teuthoidea) increased during the summer. Invertebrates and capelin made up a greater proportion of the diet in 1992, owing to a decline in consumption of Arctic cod. This finding was associated with a decrease in the mass of stomach contents. Diet diversity did not change significantly over the study period. |
format |
Article in Journal/Newspaper |
author |
Lawson, John W. Stenson, Garry B. McKinnon, Dave G. |
author_facet |
Lawson, John W. Stenson, Garry B. McKinnon, Dave G. |
author_sort |
Lawson, John W. |
title |
Diet of harp seals ( Phoca groenlandica ) in nearshore waters of the northwest Atlantic during 1990 – 1993 |
title_short |
Diet of harp seals ( Phoca groenlandica ) in nearshore waters of the northwest Atlantic during 1990 – 1993 |
title_full |
Diet of harp seals ( Phoca groenlandica ) in nearshore waters of the northwest Atlantic during 1990 – 1993 |
title_fullStr |
Diet of harp seals ( Phoca groenlandica ) in nearshore waters of the northwest Atlantic during 1990 – 1993 |
title_full_unstemmed |
Diet of harp seals ( Phoca groenlandica ) in nearshore waters of the northwest Atlantic during 1990 – 1993 |
title_sort |
diet of harp seals ( phoca groenlandica ) in nearshore waters of the northwest atlantic during 1990 – 1993 |
publisher |
Canadian Science Publishing |
publishDate |
1995 |
url |
http://dx.doi.org/10.1139/z95-213 http://www.nrcresearchpress.com/doi/pdf/10.1139/z95-213 |
geographic |
Arctic Newfoundland |
geographic_facet |
Arctic Newfoundland |
genre |
Arctic cod Arctic atlantic cod Boreogadus saida Gadus morhua Newfoundland Northwest Atlantic Phoca groenlandica |
genre_facet |
Arctic cod Arctic atlantic cod Boreogadus saida Gadus morhua Newfoundland Northwest Atlantic Phoca groenlandica |
op_source |
Canadian Journal of Zoology volume 73, issue 10, page 1805-1818 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z95-213 |
container_title |
Canadian Journal of Zoology |
container_volume |
73 |
container_issue |
10 |
container_start_page |
1805 |
op_container_end_page |
1818 |
_version_ |
1795663034125910016 |