VARIABILITY IN THE DIET OF HARBOR PORPOISES ( PHOCOENA PHOCOENA) IN SCOTTISH WATERS 1992–2003
A bstract Interannual, seasonal, and regional variation in the diet of porpoises, Phocoena phocoena , in Scottish (UK) waters was studied using stomach contents of animals stranded between 1992 and 2003. Most samples came from the east coast (including many porpoises killed by bottlenose dolphins),...
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Online Access: | http://dx.doi.org/10.1111/j.1748-7692.2004.tb01138.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2004.tb01138.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2004.tb01138.x |
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crwiley:10.1111/j.1748-7692.2004.tb01138.x 2024-06-23T07:56:11+00:00 VARIABILITY IN THE DIET OF HARBOR PORPOISES ( PHOCOENA PHOCOENA) IN SCOTTISH WATERS 1992–2003 Santos, M. B. Pierce, G. J. Learmonth, J. A. Reid, R. J. Ross, H. M. Patterson, I. A. P. Reid, D. G. Beare, D. 2004 http://dx.doi.org/10.1111/j.1748-7692.2004.tb01138.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2004.tb01138.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2004.tb01138.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 20, issue 1, page 1-27 ISSN 0824-0469 1748-7692 journal-article 2004 crwiley https://doi.org/10.1111/j.1748-7692.2004.tb01138.x 2024-06-11T04:43:52Z A bstract Interannual, seasonal, and regional variation in the diet of porpoises, Phocoena phocoena , in Scottish (UK) waters was studied using stomach contents of animals stranded between 1992 and 2003. Most samples came from the east coast (including many porpoises killed by bottlenose dolphins), with smaller numbers from the west coast and from Shetland. The most important prey types, in terms of contribution by number and mass, were whiting ( Merlangius merlangus ) and sand eels (Ammodytidae). Multivariate analysis confirmed the existence of regional, seasonal, and interannual variation in diet, as well as differences ( i. e. , biases) related to cause of death. These differences were further explored using univariate analyses. Sand eels were more important in the summer months (quarters 2 and 3) and on the east coast, whereas gadids were more important in winter and in the Shetland area. Some, but not all, observed trends in the numerical importance and size of prey taken were consistent with trends in abundance and size of fish taken during research trawl surveys. There was some evidence that porpoises <1 yr old took more gobies (Gobiidae) and shrimps than did older porpoises. Clupeids (herring Clupea harengus and sprat Sprattus sprattus ) formed a relatively small proportion of the diet, but their importance varied from year to year. Although possible methodological biases prevent firm conclusions, it appears that the importance of clupeids in porpoise diet may have decreased since the 1960s, mirroring the decline in North Sea herring abundance. The recovery of the North Sea herring stock in recent years is not as yet reflected in porpoise diet. Article in Journal/Newspaper Phocoena phocoena Wiley Online Library Marine Mammal Science 20 1 1 27 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
A bstract Interannual, seasonal, and regional variation in the diet of porpoises, Phocoena phocoena , in Scottish (UK) waters was studied using stomach contents of animals stranded between 1992 and 2003. Most samples came from the east coast (including many porpoises killed by bottlenose dolphins), with smaller numbers from the west coast and from Shetland. The most important prey types, in terms of contribution by number and mass, were whiting ( Merlangius merlangus ) and sand eels (Ammodytidae). Multivariate analysis confirmed the existence of regional, seasonal, and interannual variation in diet, as well as differences ( i. e. , biases) related to cause of death. These differences were further explored using univariate analyses. Sand eels were more important in the summer months (quarters 2 and 3) and on the east coast, whereas gadids were more important in winter and in the Shetland area. Some, but not all, observed trends in the numerical importance and size of prey taken were consistent with trends in abundance and size of fish taken during research trawl surveys. There was some evidence that porpoises <1 yr old took more gobies (Gobiidae) and shrimps than did older porpoises. Clupeids (herring Clupea harengus and sprat Sprattus sprattus ) formed a relatively small proportion of the diet, but their importance varied from year to year. Although possible methodological biases prevent firm conclusions, it appears that the importance of clupeids in porpoise diet may have decreased since the 1960s, mirroring the decline in North Sea herring abundance. The recovery of the North Sea herring stock in recent years is not as yet reflected in porpoise diet. |
format |
Article in Journal/Newspaper |
author |
Santos, M. B. Pierce, G. J. Learmonth, J. A. Reid, R. J. Ross, H. M. Patterson, I. A. P. Reid, D. G. Beare, D. |
spellingShingle |
Santos, M. B. Pierce, G. J. Learmonth, J. A. Reid, R. J. Ross, H. M. Patterson, I. A. P. Reid, D. G. Beare, D. VARIABILITY IN THE DIET OF HARBOR PORPOISES ( PHOCOENA PHOCOENA) IN SCOTTISH WATERS 1992–2003 |
author_facet |
Santos, M. B. Pierce, G. J. Learmonth, J. A. Reid, R. J. Ross, H. M. Patterson, I. A. P. Reid, D. G. Beare, D. |
author_sort |
Santos, M. B. |
title |
VARIABILITY IN THE DIET OF HARBOR PORPOISES ( PHOCOENA PHOCOENA) IN SCOTTISH WATERS 1992–2003 |
title_short |
VARIABILITY IN THE DIET OF HARBOR PORPOISES ( PHOCOENA PHOCOENA) IN SCOTTISH WATERS 1992–2003 |
title_full |
VARIABILITY IN THE DIET OF HARBOR PORPOISES ( PHOCOENA PHOCOENA) IN SCOTTISH WATERS 1992–2003 |
title_fullStr |
VARIABILITY IN THE DIET OF HARBOR PORPOISES ( PHOCOENA PHOCOENA) IN SCOTTISH WATERS 1992–2003 |
title_full_unstemmed |
VARIABILITY IN THE DIET OF HARBOR PORPOISES ( PHOCOENA PHOCOENA) IN SCOTTISH WATERS 1992–2003 |
title_sort |
variability in the diet of harbor porpoises ( phocoena phocoena) in scottish waters 1992–2003 |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2004.tb01138.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2004.tb01138.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2004.tb01138.x |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Marine Mammal Science volume 20, issue 1, page 1-27 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2004.tb01138.x |
container_title |
Marine Mammal Science |
container_volume |
20 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
27 |
_version_ |
1802649131634655232 |