Predation by seals on salmonids in two Scottish estuaries
Abstract Detailed observations of the behaviour of harbour seals, Phoca vitulina L., at sites within the estuaries of the Rivers Dee and Don, in north-eastern Scotland, were made over two full years between 1993 and 1996. Small numbers of grey seals, Halichoerus grypus Fab., were also present. The p...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.571.2880 2023-05-15T17:58:57+02:00 Predation by seals on salmonids in two Scottish estuaries The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.571.2880 http://www.abdn.ac.uk/marfish/pdfs/Carter2001.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.571.2880 http://www.abdn.ac.uk/marfish/pdfs/Carter2001.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.abdn.ac.uk/marfish/pdfs/Carter2001.pdf behaviour estuaries fisheries interactions grey seals harbour seals. Correspondence Dr T. J. Carter Department of Life Sciences Anglia Polytechnic University East Road text ftciteseerx 2016-01-08T12:32:28Z Abstract Detailed observations of the behaviour of harbour seals, Phoca vitulina L., at sites within the estuaries of the Rivers Dee and Don, in north-eastern Scotland, were made over two full years between 1993 and 1996. Small numbers of grey seals, Halichoerus grypus Fab., were also present. The presence of seals within the estuaries was strongly related to season, with maximum numbers observed in winter and early spring; seals were virtually absent in June and July. The River Don was used largely as a haul-out site, while the River Dee was used predominantly as a foraging site, although it was not possible to determine whether the same seals were using the two estuaries. More seals were hauled-out on the River Don during twilight and dark than in daylight. The seals were observed to eat mostly salmonids, Salmo salar L. and S. trutta L., unidentified roundfish and flounder, Pleuronectes flesus L. The otoliths identified in scats collected at the mouth of the River Don belonged to marine species indicating that the seals were also feeding outside the estuaries. A minimum estimate is given of the numbers of large salmonids eaten in each river during the course of the year. Although no information was available on the numbers of salmonids using the rivers or the reproductive status of the fish eaten by the seals, as a cause of mortality, seal predation on large salmonids in estuaries is apparently an order of magnitude less important than mortality caused by angling within the river. Text Phoca vitulina Salmo salar Unknown Dee ENVELOPE(-59.767,-59.767,-62.433,-62.433) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
behaviour estuaries fisheries interactions grey seals harbour seals. Correspondence Dr T. J. Carter Department of Life Sciences Anglia Polytechnic University East Road |
spellingShingle |
behaviour estuaries fisheries interactions grey seals harbour seals. Correspondence Dr T. J. Carter Department of Life Sciences Anglia Polytechnic University East Road Predation by seals on salmonids in two Scottish estuaries |
topic_facet |
behaviour estuaries fisheries interactions grey seals harbour seals. Correspondence Dr T. J. Carter Department of Life Sciences Anglia Polytechnic University East Road |
description |
Abstract Detailed observations of the behaviour of harbour seals, Phoca vitulina L., at sites within the estuaries of the Rivers Dee and Don, in north-eastern Scotland, were made over two full years between 1993 and 1996. Small numbers of grey seals, Halichoerus grypus Fab., were also present. The presence of seals within the estuaries was strongly related to season, with maximum numbers observed in winter and early spring; seals were virtually absent in June and July. The River Don was used largely as a haul-out site, while the River Dee was used predominantly as a foraging site, although it was not possible to determine whether the same seals were using the two estuaries. More seals were hauled-out on the River Don during twilight and dark than in daylight. The seals were observed to eat mostly salmonids, Salmo salar L. and S. trutta L., unidentified roundfish and flounder, Pleuronectes flesus L. The otoliths identified in scats collected at the mouth of the River Don belonged to marine species indicating that the seals were also feeding outside the estuaries. A minimum estimate is given of the numbers of large salmonids eaten in each river during the course of the year. Although no information was available on the numbers of salmonids using the rivers or the reproductive status of the fish eaten by the seals, as a cause of mortality, seal predation on large salmonids in estuaries is apparently an order of magnitude less important than mortality caused by angling within the river. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
title |
Predation by seals on salmonids in two Scottish estuaries |
title_short |
Predation by seals on salmonids in two Scottish estuaries |
title_full |
Predation by seals on salmonids in two Scottish estuaries |
title_fullStr |
Predation by seals on salmonids in two Scottish estuaries |
title_full_unstemmed |
Predation by seals on salmonids in two Scottish estuaries |
title_sort |
predation by seals on salmonids in two scottish estuaries |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.571.2880 http://www.abdn.ac.uk/marfish/pdfs/Carter2001.pdf |
long_lat |
ENVELOPE(-59.767,-59.767,-62.433,-62.433) |
geographic |
Dee |
geographic_facet |
Dee |
genre |
Phoca vitulina Salmo salar |
genre_facet |
Phoca vitulina Salmo salar |
op_source |
http://www.abdn.ac.uk/marfish/pdfs/Carter2001.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.571.2880 http://www.abdn.ac.uk/marfish/pdfs/Carter2001.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766167684752343040 |