DIET OF HARP SEALS ( PAGOPHILUS GROENLANDICUS ) IN NEARSHORE NORTHEAST NEWFOUNDLAND: INFERENCES FROM STABLE‐CARBON (δ 13 C) AND NITROGEN (δ 15 N) ISOTOPE ANALYSES
A bstract Trophic position, and often the source of feeding of predators in food webs, can be estimated using measurements of stable isotope ratios of nitrogen and carbon in predators and their prey. Muscle samples from 60 harp seals ( Pagophilus groenlandicus ) collected during May 1995 in nearshor...
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crwiley:10.1111/j.1748-7692.2000.tb00953.x 2023-12-03T10:19:03+01:00 DIET OF HARP SEALS ( PAGOPHILUS GROENLANDICUS ) IN NEARSHORE NORTHEAST NEWFOUNDLAND: INFERENCES FROM STABLE‐CARBON (δ 13 C) AND NITROGEN (δ 15 N) ISOTOPE ANALYSES Lawson, John W. Hobson, Keith A. 2000 http://dx.doi.org/10.1111/j.1748-7692.2000.tb00953.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2000.tb00953.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2000.tb00953.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 16, issue 3, page 578-591 ISSN 0824-0469 1748-7692 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2000 crwiley https://doi.org/10.1111/j.1748-7692.2000.tb00953.x 2023-11-09T13:25:58Z A bstract Trophic position, and often the source of feeding of predators in food webs, can be estimated using measurements of stable isotope ratios of nitrogen and carbon in predators and their prey. Muscle samples from 60 harp seals ( Pagophilus groenlandicus ) collected during May 1995 in nearshore waters of New foundland, Canada, were analyzed for δ 13 C and δ 15 N values. These values were compared with those for 63 prey samples representing seven species generally collected near the same area. Using diet‐tissue isotopic fractionation factors derived from previous studies using captive animals, we infer a greater dependence of harp seals on lower trophic‐level prey during April compared with results expected from exclusive diets of Atlantic cod ( Gadus morhua ), Atlantic herring ( Clupea harengus ), Greenland halibut ( Reinhardtius hippoglossoides ), or northern shrimp ( Pandalus borealis ). Our mean δ 15 N value for harp seals is lower than previous findings for seals collected on the winter whelping patch and may be a function of interannual or seasonal differences in diet. Subadult seals (aged 1‐4 yr) had significantly lower δ 15 N values than adults (5 + yr), suggesting that older seals were feeding at a slightly higher trophic level. Article in Journal/Newspaper atlantic cod Gadus morhua Greenland Newfoundland northern shrimp Pagophilus groenlandicus Pandalus borealis Wiley Online Library (via Crossref) Canada Greenland Marine Mammal Science 16 3 578 591 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Lawson, John W. Hobson, Keith A. DIET OF HARP SEALS ( PAGOPHILUS GROENLANDICUS ) IN NEARSHORE NORTHEAST NEWFOUNDLAND: INFERENCES FROM STABLE‐CARBON (δ 13 C) AND NITROGEN (δ 15 N) ISOTOPE ANALYSES |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
A bstract Trophic position, and often the source of feeding of predators in food webs, can be estimated using measurements of stable isotope ratios of nitrogen and carbon in predators and their prey. Muscle samples from 60 harp seals ( Pagophilus groenlandicus ) collected during May 1995 in nearshore waters of New foundland, Canada, were analyzed for δ 13 C and δ 15 N values. These values were compared with those for 63 prey samples representing seven species generally collected near the same area. Using diet‐tissue isotopic fractionation factors derived from previous studies using captive animals, we infer a greater dependence of harp seals on lower trophic‐level prey during April compared with results expected from exclusive diets of Atlantic cod ( Gadus morhua ), Atlantic herring ( Clupea harengus ), Greenland halibut ( Reinhardtius hippoglossoides ), or northern shrimp ( Pandalus borealis ). Our mean δ 15 N value for harp seals is lower than previous findings for seals collected on the winter whelping patch and may be a function of interannual or seasonal differences in diet. Subadult seals (aged 1‐4 yr) had significantly lower δ 15 N values than adults (5 + yr), suggesting that older seals were feeding at a slightly higher trophic level. |
format |
Article in Journal/Newspaper |
author |
Lawson, John W. Hobson, Keith A. |
author_facet |
Lawson, John W. Hobson, Keith A. |
author_sort |
Lawson, John W. |
title |
DIET OF HARP SEALS ( PAGOPHILUS GROENLANDICUS ) IN NEARSHORE NORTHEAST NEWFOUNDLAND: INFERENCES FROM STABLE‐CARBON (δ 13 C) AND NITROGEN (δ 15 N) ISOTOPE ANALYSES |
title_short |
DIET OF HARP SEALS ( PAGOPHILUS GROENLANDICUS ) IN NEARSHORE NORTHEAST NEWFOUNDLAND: INFERENCES FROM STABLE‐CARBON (δ 13 C) AND NITROGEN (δ 15 N) ISOTOPE ANALYSES |
title_full |
DIET OF HARP SEALS ( PAGOPHILUS GROENLANDICUS ) IN NEARSHORE NORTHEAST NEWFOUNDLAND: INFERENCES FROM STABLE‐CARBON (δ 13 C) AND NITROGEN (δ 15 N) ISOTOPE ANALYSES |
title_fullStr |
DIET OF HARP SEALS ( PAGOPHILUS GROENLANDICUS ) IN NEARSHORE NORTHEAST NEWFOUNDLAND: INFERENCES FROM STABLE‐CARBON (δ 13 C) AND NITROGEN (δ 15 N) ISOTOPE ANALYSES |
title_full_unstemmed |
DIET OF HARP SEALS ( PAGOPHILUS GROENLANDICUS ) IN NEARSHORE NORTHEAST NEWFOUNDLAND: INFERENCES FROM STABLE‐CARBON (δ 13 C) AND NITROGEN (δ 15 N) ISOTOPE ANALYSES |
title_sort |
diet of harp seals ( pagophilus groenlandicus ) in nearshore northeast newfoundland: inferences from stable‐carbon (δ 13 c) and nitrogen (δ 15 n) isotope analyses |
publisher |
Wiley |
publishDate |
2000 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2000.tb00953.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2000.tb00953.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2000.tb00953.x |
geographic |
Canada Greenland |
geographic_facet |
Canada Greenland |
genre |
atlantic cod Gadus morhua Greenland Newfoundland northern shrimp Pagophilus groenlandicus Pandalus borealis |
genre_facet |
atlantic cod Gadus morhua Greenland Newfoundland northern shrimp Pagophilus groenlandicus Pandalus borealis |
op_source |
Marine Mammal Science volume 16, issue 3, page 578-591 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2000.tb00953.x |
container_title |
Marine Mammal Science |
container_volume |
16 |
container_issue |
3 |
container_start_page |
578 |
op_container_end_page |
591 |
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1784266188325388288 |