Comparing the diet of cod ( Gadus morhua ) and grey seals ( Halichoerus grypus ): an investigation of secondary ingestion
Otoliths from the stomachs of 138 by-caught grey seals ( Halichoerus grypus ) from the west coast of Ireland were compared with otoliths from the stomachs of 364 commercially caught cod ( Gadus morhua ) to determine if there were any overlaps in type, number and size of prey that might be attributab...
Published in: | Journal of the Marine Biological Association of the United Kingdom |
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Language: | English |
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Cambridge University Press (CUP)
2001
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Online Access: | http://dx.doi.org/10.1017/s0025315401003952 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315401003952 |
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crcambridgeupr:10.1017/s0025315401003952 2024-03-03T08:44:31+00:00 Comparing the diet of cod ( Gadus morhua ) and grey seals ( Halichoerus grypus ): an investigation of secondary ingestion Arnett, Richard T.P. Whelan, John 2001 http://dx.doi.org/10.1017/s0025315401003952 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315401003952 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of the Marine Biological Association of the United Kingdom volume 81, issue 2, page 365-366 ISSN 0025-3154 1469-7769 Aquatic Science journal-article 2001 crcambridgeupr https://doi.org/10.1017/s0025315401003952 2024-02-08T08:40:08Z Otoliths from the stomachs of 138 by-caught grey seals ( Halichoerus grypus ) from the west coast of Ireland were compared with otoliths from the stomachs of 364 commercially caught cod ( Gadus morhua ) to determine if there were any overlaps in type, number and size of prey that might be attributable to secondary ingestion. A total of 19 species/groups were common to both cod and seal stomachs accounting for 99·6% and 95·8% of the otoliths from cod and seal stomachs respectively. There were significant differences between the otolith/fish lengths of all six species/groups compared but there were overlaps in the size distributions. Analysis of the diet composition of the cod stomachs suggested that larger cod consumed mainly fish and smaller cod consumed mainly crustaceans. Cod and seals were utilizing the same fish prey but the seals were generally consuming larger fish. Overlaps between the size distributions of prey species/groups suggest that secondary ingestion was possible and should be considered in future seal diet studies. Article in Journal/Newspaper Gadus morhua Cambridge University Press Journal of the Marine Biological Association of the United Kingdom 81 2 365 366 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Aquatic Science |
spellingShingle |
Aquatic Science Arnett, Richard T.P. Whelan, John Comparing the diet of cod ( Gadus morhua ) and grey seals ( Halichoerus grypus ): an investigation of secondary ingestion |
topic_facet |
Aquatic Science |
description |
Otoliths from the stomachs of 138 by-caught grey seals ( Halichoerus grypus ) from the west coast of Ireland were compared with otoliths from the stomachs of 364 commercially caught cod ( Gadus morhua ) to determine if there were any overlaps in type, number and size of prey that might be attributable to secondary ingestion. A total of 19 species/groups were common to both cod and seal stomachs accounting for 99·6% and 95·8% of the otoliths from cod and seal stomachs respectively. There were significant differences between the otolith/fish lengths of all six species/groups compared but there were overlaps in the size distributions. Analysis of the diet composition of the cod stomachs suggested that larger cod consumed mainly fish and smaller cod consumed mainly crustaceans. Cod and seals were utilizing the same fish prey but the seals were generally consuming larger fish. Overlaps between the size distributions of prey species/groups suggest that secondary ingestion was possible and should be considered in future seal diet studies. |
format |
Article in Journal/Newspaper |
author |
Arnett, Richard T.P. Whelan, John |
author_facet |
Arnett, Richard T.P. Whelan, John |
author_sort |
Arnett, Richard T.P. |
title |
Comparing the diet of cod ( Gadus morhua ) and grey seals ( Halichoerus grypus ): an investigation of secondary ingestion |
title_short |
Comparing the diet of cod ( Gadus morhua ) and grey seals ( Halichoerus grypus ): an investigation of secondary ingestion |
title_full |
Comparing the diet of cod ( Gadus morhua ) and grey seals ( Halichoerus grypus ): an investigation of secondary ingestion |
title_fullStr |
Comparing the diet of cod ( Gadus morhua ) and grey seals ( Halichoerus grypus ): an investigation of secondary ingestion |
title_full_unstemmed |
Comparing the diet of cod ( Gadus morhua ) and grey seals ( Halichoerus grypus ): an investigation of secondary ingestion |
title_sort |
comparing the diet of cod ( gadus morhua ) and grey seals ( halichoerus grypus ): an investigation of secondary ingestion |
publisher |
Cambridge University Press (CUP) |
publishDate |
2001 |
url |
http://dx.doi.org/10.1017/s0025315401003952 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315401003952 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Journal of the Marine Biological Association of the United Kingdom volume 81, issue 2, page 365-366 ISSN 0025-3154 1469-7769 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0025315401003952 |
container_title |
Journal of the Marine Biological Association of the United Kingdom |
container_volume |
81 |
container_issue |
2 |
container_start_page |
365 |
op_container_end_page |
366 |
_version_ |
1792500011996545024 |