THE TROPHIC ROLE OF MARINE MAMMALS IN THE NORTHERN GULF OF ST. LAWRENCE
Abstract The trophic role of apex predators was evaluated in the northern Gulf of St. Lawrence ecosystem. An Ecopath model was developed for the period 1985–1987 prior to the collapse of commercially exploited demersal fish stocks in this area. Marine mammal trophic levels were estimated by the mode...
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crwiley:10.1111/j.1748-7692.2006.00007.x 2024-05-19T07:37:08+00:00 THE TROPHIC ROLE OF MARINE MAMMALS IN THE NORTHERN GULF OF ST. LAWRENCE Morissette, L. Hammill, M. O. Savenkoff, C. 2006 http://dx.doi.org/10.1111/j.1748-7692.2006.00007.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2006.00007.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 22, issue 1, page 74-103 ISSN 0824-0469 1748-7692 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2006 crwiley https://doi.org/10.1111/j.1748-7692.2006.00007.x 2024-04-22T07:33:29Z Abstract The trophic role of apex predators was evaluated in the northern Gulf of St. Lawrence ecosystem. An Ecopath model was developed for the period 1985–1987 prior to the collapse of commercially exploited demersal fish stocks in this area. Marine mammal trophic levels were estimated by the model at 4.1 for cetaceans, 4.4 for harp seals ( Pagophilus groenlandicus ), 4.7 for hooded seals ( Cystophora cristata ), 4.5 for gray seals ( Halichoerus grypus ), and 4.3 for harbor seals ( Phoca vitulina ). Harp seals were the third most important predator on vertebrate prey following large Atlantic cod ( Gadus morhua ) and redfish ( Sebastes spp.). Different seal species preyed on different levels of the food chain. Harp seals preyed on most trophic groups, whereas larger seals, such as gray seals and hooded seals, mainly consumed higher trophic levels. The model suggested that apex predators had a negative effect on their dominant prey, the higher trophic level fish, but an indirect positive feedback on the prey of their preferred prey, mainly American plaice ( Hippoglossoides platessoides ), flounders, skates, and benthic invertebrates. Our results suggest that both marine mammals and fisheries had an impact on the trophic structure. Article in Journal/Newspaper atlantic cod Cystophora cristata Gadus morhua Pagophilus groenlandicus Phoca vitulina Wiley Online Library Marine Mammal Science 22 1 74 103 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Morissette, L. Hammill, M. O. Savenkoff, C. THE TROPHIC ROLE OF MARINE MAMMALS IN THE NORTHERN GULF OF ST. LAWRENCE |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract The trophic role of apex predators was evaluated in the northern Gulf of St. Lawrence ecosystem. An Ecopath model was developed for the period 1985–1987 prior to the collapse of commercially exploited demersal fish stocks in this area. Marine mammal trophic levels were estimated by the model at 4.1 for cetaceans, 4.4 for harp seals ( Pagophilus groenlandicus ), 4.7 for hooded seals ( Cystophora cristata ), 4.5 for gray seals ( Halichoerus grypus ), and 4.3 for harbor seals ( Phoca vitulina ). Harp seals were the third most important predator on vertebrate prey following large Atlantic cod ( Gadus morhua ) and redfish ( Sebastes spp.). Different seal species preyed on different levels of the food chain. Harp seals preyed on most trophic groups, whereas larger seals, such as gray seals and hooded seals, mainly consumed higher trophic levels. The model suggested that apex predators had a negative effect on their dominant prey, the higher trophic level fish, but an indirect positive feedback on the prey of their preferred prey, mainly American plaice ( Hippoglossoides platessoides ), flounders, skates, and benthic invertebrates. Our results suggest that both marine mammals and fisheries had an impact on the trophic structure. |
format |
Article in Journal/Newspaper |
author |
Morissette, L. Hammill, M. O. Savenkoff, C. |
author_facet |
Morissette, L. Hammill, M. O. Savenkoff, C. |
author_sort |
Morissette, L. |
title |
THE TROPHIC ROLE OF MARINE MAMMALS IN THE NORTHERN GULF OF ST. LAWRENCE |
title_short |
THE TROPHIC ROLE OF MARINE MAMMALS IN THE NORTHERN GULF OF ST. LAWRENCE |
title_full |
THE TROPHIC ROLE OF MARINE MAMMALS IN THE NORTHERN GULF OF ST. LAWRENCE |
title_fullStr |
THE TROPHIC ROLE OF MARINE MAMMALS IN THE NORTHERN GULF OF ST. LAWRENCE |
title_full_unstemmed |
THE TROPHIC ROLE OF MARINE MAMMALS IN THE NORTHERN GULF OF ST. LAWRENCE |
title_sort |
trophic role of marine mammals in the northern gulf of st. lawrence |
publisher |
Wiley |
publishDate |
2006 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2006.00007.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2006.00007.x |
genre |
atlantic cod Cystophora cristata Gadus morhua Pagophilus groenlandicus Phoca vitulina |
genre_facet |
atlantic cod Cystophora cristata Gadus morhua Pagophilus groenlandicus Phoca vitulina |
op_source |
Marine Mammal Science volume 22, issue 1, page 74-103 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2006.00007.x |
container_title |
Marine Mammal Science |
container_volume |
22 |
container_issue |
1 |
container_start_page |
74 |
op_container_end_page |
103 |
_version_ |
1799476379562016768 |