Feeding ecology of piscivorous brown trout (Salmo trutta L.) in a subarctic watercourse
Source at http://www.sekj.org/AnnZool.html . Feeding ecology of piscivorous brown trout was studied in the Pasvik watercourse, Norway and Russia. The watercourse is heavily regulated for hydroelectric purposes, and 5000 brown trout > 25 cm are stocked annually to compensate the negative impacts o...
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2004
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ftunivtroemsoe:oai:munin.uit.no:10037/14673 2023-05-15T17:54:41+02:00 Feeding ecology of piscivorous brown trout (Salmo trutta L.) in a subarctic watercourse Jensen, Hallvard Bøhn, Thomas Amundsen, Per-Arne Aspholm, Paul Erik 2004-02 https://hdl.handle.net/10037/14673 eng eng Finnish Zoological and Botanical Publishing Board Annales Zoologici Fennici Jensen, H., Bøhn, T., Amundsen, P.-A. & Aspholm, P.E. (2004). Feeding ecology of piscivorous brown trout ( Salmo trutta L.) in a subarctic watercourse. Annales Zoologici Fennici, 41 , 319-328. FRIDAID 425560 0003-455X 1797-2450 https://hdl.handle.net/10037/14673 openAccess VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 Journal article Tidsskriftartikkel Peer reviewed 2004 ftunivtroemsoe 2021-06-25T17:56:25Z Source at http://www.sekj.org/AnnZool.html . Feeding ecology of piscivorous brown trout was studied in the Pasvik watercourse, Norway and Russia. The watercourse is heavily regulated for hydroelectric purposes, and 5000 brown trout > 25 cm are stocked annually to compensate the negative impacts of the impoundments. Stocked and wild trout had almost identical diets consisting mainly of vendace Coregonus albula and partly of whitefish Coregonus lavaretus. Vendace has recently invaded the watercourse, and totally dominated the brown trout diet in the upstream part, where it has become the dominant species in the pelagic habitat. In the downstream part, where vendace were less prevalent, whitefish contributed to a larger extent to the trout diet. No correlation between predator (brown trout) and prey (vendace) lengths was found in the upstream part, and only a weak positive correlation was found in the downstream part. The length of whitefish eaten by brown trout, in contrast, showed a positive correlation with predator length in both the upstream and downstream part. The prey selection of brown trout was, to a large extent, explained by the differences in density and size-structure of coregonids in the two sampling areas. Article in Journal/Newspaper Pasvik Subarctic University of Tromsø: Munin Open Research Archive Norway Pasvik ENVELOPE(30.580,30.580,69.810,69.810) |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 |
spellingShingle |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 Jensen, Hallvard Bøhn, Thomas Amundsen, Per-Arne Aspholm, Paul Erik Feeding ecology of piscivorous brown trout (Salmo trutta L.) in a subarctic watercourse |
topic_facet |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 |
description |
Source at http://www.sekj.org/AnnZool.html . Feeding ecology of piscivorous brown trout was studied in the Pasvik watercourse, Norway and Russia. The watercourse is heavily regulated for hydroelectric purposes, and 5000 brown trout > 25 cm are stocked annually to compensate the negative impacts of the impoundments. Stocked and wild trout had almost identical diets consisting mainly of vendace Coregonus albula and partly of whitefish Coregonus lavaretus. Vendace has recently invaded the watercourse, and totally dominated the brown trout diet in the upstream part, where it has become the dominant species in the pelagic habitat. In the downstream part, where vendace were less prevalent, whitefish contributed to a larger extent to the trout diet. No correlation between predator (brown trout) and prey (vendace) lengths was found in the upstream part, and only a weak positive correlation was found in the downstream part. The length of whitefish eaten by brown trout, in contrast, showed a positive correlation with predator length in both the upstream and downstream part. The prey selection of brown trout was, to a large extent, explained by the differences in density and size-structure of coregonids in the two sampling areas. |
format |
Article in Journal/Newspaper |
author |
Jensen, Hallvard Bøhn, Thomas Amundsen, Per-Arne Aspholm, Paul Erik |
author_facet |
Jensen, Hallvard Bøhn, Thomas Amundsen, Per-Arne Aspholm, Paul Erik |
author_sort |
Jensen, Hallvard |
title |
Feeding ecology of piscivorous brown trout (Salmo trutta L.) in a subarctic watercourse |
title_short |
Feeding ecology of piscivorous brown trout (Salmo trutta L.) in a subarctic watercourse |
title_full |
Feeding ecology of piscivorous brown trout (Salmo trutta L.) in a subarctic watercourse |
title_fullStr |
Feeding ecology of piscivorous brown trout (Salmo trutta L.) in a subarctic watercourse |
title_full_unstemmed |
Feeding ecology of piscivorous brown trout (Salmo trutta L.) in a subarctic watercourse |
title_sort |
feeding ecology of piscivorous brown trout (salmo trutta l.) in a subarctic watercourse |
publisher |
Finnish Zoological and Botanical Publishing Board |
publishDate |
2004 |
url |
https://hdl.handle.net/10037/14673 |
long_lat |
ENVELOPE(30.580,30.580,69.810,69.810) |
geographic |
Norway Pasvik |
geographic_facet |
Norway Pasvik |
genre |
Pasvik Subarctic |
genre_facet |
Pasvik Subarctic |
op_relation |
Annales Zoologici Fennici Jensen, H., Bøhn, T., Amundsen, P.-A. & Aspholm, P.E. (2004). Feeding ecology of piscivorous brown trout ( Salmo trutta L.) in a subarctic watercourse. Annales Zoologici Fennici, 41 , 319-328. FRIDAID 425560 0003-455X 1797-2450 https://hdl.handle.net/10037/14673 |
op_rights |
openAccess |
_version_ |
1766162477088768000 |