Explaining diet composition of North Sea cod ( Gadus morhua): prey size preference vs. prey availability
The nature and significance of size preference for fish prey in the diet selection of North Sea cod (Gadus morhua L.) was analysed. The analysis combined information on size-specific abundance derived from bottom trawl surveys with prey size frequencies in cod stomachs from the International North S...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
2003
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Online Access: | http://dx.doi.org/10.1139/f03-007 http://www.nrcresearchpress.com/doi/pdf/10.1139/f03-007 |
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crcansciencepubl:10.1139/f03-007 2024-05-19T07:40:34+00:00 Explaining diet composition of North Sea cod ( Gadus morhua): prey size preference vs. prey availability Floeter, Jens Temming, Axel 2003 http://dx.doi.org/10.1139/f03-007 http://www.nrcresearchpress.com/doi/pdf/10.1139/f03-007 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 60, issue 2, page 140-150 ISSN 0706-652X 1205-7533 journal-article 2003 crcansciencepubl https://doi.org/10.1139/f03-007 2024-05-02T06:51:25Z The nature and significance of size preference for fish prey in the diet selection of North Sea cod (Gadus morhua L.) was analysed. The analysis combined information on size-specific abundance derived from bottom trawl surveys with prey size frequencies in cod stomachs from the International North Sea Stomach Database. To estimate the abundance of all potential fish prey in the sea, a length-based number spectrum was calculated, corrected for gear efficiency by the application of a species-specific correction factor, and weighted by local predator abundance to take the spatialtemporal overlap between cod and its prey into consideration. A prey size preference model for cod feeding on fish is presented. Results showed that the preferred predator-to-prey weight ratio is an exponentially increasing function of predator size and an exponentially decreasing function of the slope of the number spectrum. More than 75% of fish found in the stomachs of North Sea cod originated from the least preferred quartile of the prey size range, indicating that prey abundance is the main determinant of the diet composition. Article in Journal/Newspaper Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 60 2 140 150 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The nature and significance of size preference for fish prey in the diet selection of North Sea cod (Gadus morhua L.) was analysed. The analysis combined information on size-specific abundance derived from bottom trawl surveys with prey size frequencies in cod stomachs from the International North Sea Stomach Database. To estimate the abundance of all potential fish prey in the sea, a length-based number spectrum was calculated, corrected for gear efficiency by the application of a species-specific correction factor, and weighted by local predator abundance to take the spatialtemporal overlap between cod and its prey into consideration. A prey size preference model for cod feeding on fish is presented. Results showed that the preferred predator-to-prey weight ratio is an exponentially increasing function of predator size and an exponentially decreasing function of the slope of the number spectrum. More than 75% of fish found in the stomachs of North Sea cod originated from the least preferred quartile of the prey size range, indicating that prey abundance is the main determinant of the diet composition. |
format |
Article in Journal/Newspaper |
author |
Floeter, Jens Temming, Axel |
spellingShingle |
Floeter, Jens Temming, Axel Explaining diet composition of North Sea cod ( Gadus morhua): prey size preference vs. prey availability |
author_facet |
Floeter, Jens Temming, Axel |
author_sort |
Floeter, Jens |
title |
Explaining diet composition of North Sea cod ( Gadus morhua): prey size preference vs. prey availability |
title_short |
Explaining diet composition of North Sea cod ( Gadus morhua): prey size preference vs. prey availability |
title_full |
Explaining diet composition of North Sea cod ( Gadus morhua): prey size preference vs. prey availability |
title_fullStr |
Explaining diet composition of North Sea cod ( Gadus morhua): prey size preference vs. prey availability |
title_full_unstemmed |
Explaining diet composition of North Sea cod ( Gadus morhua): prey size preference vs. prey availability |
title_sort |
explaining diet composition of north sea cod ( gadus morhua): prey size preference vs. prey availability |
publisher |
Canadian Science Publishing |
publishDate |
2003 |
url |
http://dx.doi.org/10.1139/f03-007 http://www.nrcresearchpress.com/doi/pdf/10.1139/f03-007 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 60, issue 2, page 140-150 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f03-007 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
60 |
container_issue |
2 |
container_start_page |
140 |
op_container_end_page |
150 |
_version_ |
1799480135558103040 |