Temporal variability in marine feeding of sympatric Arctic charr and sea trout
The marine feeding pattern of anadromous brown trout (sea trout) Salmo trutta and Arctic charr Salvelinus alpinus was studied during June to August in 1992–1993 and 2000–2004 in a fjord in northern Norway. In general sea trout fed proportionally more on fishes than on crustaceans and insects (81, 1...
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crwiley:10.1111/j.1095-8649.2007.01345.x 2024-09-15T17:52:21+00:00 Temporal variability in marine feeding of sympatric Arctic charr and sea trout Rikardsen, A. H. Dempson, J. B. Amundsen, P.‐A. Bjørn, P. A. Finstad, B. Jensen, A. J. 2007 http://dx.doi.org/10.1111/j.1095-8649.2007.01345.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2007.01345.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2007.01345.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 70, issue 3, page 837-852 ISSN 0022-1112 1095-8649 journal-article 2007 crwiley https://doi.org/10.1111/j.1095-8649.2007.01345.x 2024-08-27T04:27:28Z The marine feeding pattern of anadromous brown trout (sea trout) Salmo trutta and Arctic charr Salvelinus alpinus was studied during June to August in 1992–1993 and 2000–2004 in a fjord in northern Norway. In general sea trout fed proportionally more on fishes than on crustaceans and insects (81, 1 and 18% by mass, respectively) by comparison with Arctic charr (52, 25 and 22% by mass, respectively). Herring Clupea harengus dominated the total fish diet of both species, but the Arctic charr also fed significantly on gadoids and sandlance Ammodytes spp. While sea trout became virtually all piscivorous at fork lengths ( L F ) ≥250 mm, the Arctic charr was ≥400 mm L F before shifting totally to a fish diet. Despite annual variation in diet and forage ratios, there was a clear shift in diet from 1992–1993 to 2000–2004. Sandlance and different crustaceans constituted most of the diet during the initial period with a shift towards gadoids and especially herring during the latter period. This shift seemed to be associated with a high abundance of herring larvae during the latter sampling period, indicating a preferential selection on herring when present, particularly by sea trout. Furthermore, an index indicated dietary overlap in years with intensive feeding on herring of both species, and usually differences in the trophic ecology during years feeding mostly on other prey species. In combination, it was hypothesized that the two species reflect the type of marine prey present within a fjord system over time, and therefore provide an index of variation in the production and biological diversity of their potential prey within fjords. Article in Journal/Newspaper Arctic charr Northern Norway Salvelinus alpinus Wiley Online Library Journal of Fish Biology 70 3 837 852 |
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Wiley Online Library |
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English |
description |
The marine feeding pattern of anadromous brown trout (sea trout) Salmo trutta and Arctic charr Salvelinus alpinus was studied during June to August in 1992–1993 and 2000–2004 in a fjord in northern Norway. In general sea trout fed proportionally more on fishes than on crustaceans and insects (81, 1 and 18% by mass, respectively) by comparison with Arctic charr (52, 25 and 22% by mass, respectively). Herring Clupea harengus dominated the total fish diet of both species, but the Arctic charr also fed significantly on gadoids and sandlance Ammodytes spp. While sea trout became virtually all piscivorous at fork lengths ( L F ) ≥250 mm, the Arctic charr was ≥400 mm L F before shifting totally to a fish diet. Despite annual variation in diet and forage ratios, there was a clear shift in diet from 1992–1993 to 2000–2004. Sandlance and different crustaceans constituted most of the diet during the initial period with a shift towards gadoids and especially herring during the latter period. This shift seemed to be associated with a high abundance of herring larvae during the latter sampling period, indicating a preferential selection on herring when present, particularly by sea trout. Furthermore, an index indicated dietary overlap in years with intensive feeding on herring of both species, and usually differences in the trophic ecology during years feeding mostly on other prey species. In combination, it was hypothesized that the two species reflect the type of marine prey present within a fjord system over time, and therefore provide an index of variation in the production and biological diversity of their potential prey within fjords. |
format |
Article in Journal/Newspaper |
author |
Rikardsen, A. H. Dempson, J. B. Amundsen, P.‐A. Bjørn, P. A. Finstad, B. Jensen, A. J. |
spellingShingle |
Rikardsen, A. H. Dempson, J. B. Amundsen, P.‐A. Bjørn, P. A. Finstad, B. Jensen, A. J. Temporal variability in marine feeding of sympatric Arctic charr and sea trout |
author_facet |
Rikardsen, A. H. Dempson, J. B. Amundsen, P.‐A. Bjørn, P. A. Finstad, B. Jensen, A. J. |
author_sort |
Rikardsen, A. H. |
title |
Temporal variability in marine feeding of sympatric Arctic charr and sea trout |
title_short |
Temporal variability in marine feeding of sympatric Arctic charr and sea trout |
title_full |
Temporal variability in marine feeding of sympatric Arctic charr and sea trout |
title_fullStr |
Temporal variability in marine feeding of sympatric Arctic charr and sea trout |
title_full_unstemmed |
Temporal variability in marine feeding of sympatric Arctic charr and sea trout |
title_sort |
temporal variability in marine feeding of sympatric arctic charr and sea trout |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1111/j.1095-8649.2007.01345.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2007.01345.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2007.01345.x |
genre |
Arctic charr Northern Norway Salvelinus alpinus |
genre_facet |
Arctic charr Northern Norway Salvelinus alpinus |
op_source |
Journal of Fish Biology volume 70, issue 3, page 837-852 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.2007.01345.x |
container_title |
Journal of Fish Biology |
container_volume |
70 |
container_issue |
3 |
container_start_page |
837 |
op_container_end_page |
852 |
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1810294394834649088 |