Predation by brown trout (Salmo trutta) along a diversifying prey community gradient
Predation has a fundamental role in aquatic ecosystems, but the relative importance of factors governing prey selection by predators remains controversial. In this study, we contrast five lakes of a subarctic watershed to explore how prey community characteristics affect prey selection and growth ra...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | https://hdl.handle.net/10037/19320 https://doi.org/10.1139/F08-096 |
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ftunivtroemsoe:oai:munin.uit.no:10037/19320 2023-05-15T18:28:27+02:00 Predation by brown trout (Salmo trutta) along a diversifying prey community gradient Jensen, Hallvard Kahilainen, Kimmo K. Amundsen, Per-Arne Gjelland, Karl øystein Tuomaala, Anti Malinen, Tommy Bøhn, Thomas 2008-08-07 https://hdl.handle.net/10037/19320 https://doi.org/10.1139/F08-096 eng eng Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences Jensen, H., Kahilainen, K.K., Amundsen, P.-A., Gjelland, K.O., Tuomaala, A., Malinen, T. & Bøhn, T. (2008). Predation by brown trout ( Salmo trutta ) along a diversifying prey community gradient. Canadian Journal of Fisheries and Aquatic Sciences, 65 (9), 1831-1841. FRIDAID 337183 doi:10.1139/F08-096 0706-652X 1205-7533 https://hdl.handle.net/10037/19320 openAccess Copyright 2008 Canadian Science Publishing VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 Journal article Tidsskriftartikkel Peer reviewed acceptedVersion 2008 ftunivtroemsoe https://doi.org/10.1139/F08-096 2021-06-25T17:56:25Z Predation has a fundamental role in aquatic ecosystems, but the relative importance of factors governing prey selection by predators remains controversial. In this study, we contrast five lakes of a subarctic watershed to explore how prey community characteristics affect prey selection and growth rate of the common top predator, brown trout ( Salmo trutta ). The lakes constitute a distinct gradient of different coregonid prey fish, ranging from monomorphic common whitefish ( Coregonus lavaretus ) to polymorphic whitefish co-occurring with vendace ( Coregonus albula ). The brown trout was a morph–species- and size-specific pelagic predator, selecting the small-sized, pelagic whitefish morph or vendace over the benthic whitefish morphs. In all lakes, the average prey size increased with predator size, but small-sized prey were also included in the diet of large predators. The selection of small-sized, pelagic prey fish appeared to be a favourable foraging strategy for the brown trout, yielding higher growth rates and an earlier ontogenetic shift to piscivory. The findings emphasize that piscivory appear to be shaped by the diversity, size-structure, and abundance of available prey in a given community. Article in Journal/Newspaper Subarctic University of Tromsø: Munin Open Research Archive Canadian Journal of Fisheries and Aquatic Sciences 65 9 1831 1841 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 |
spellingShingle |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 Jensen, Hallvard Kahilainen, Kimmo K. Amundsen, Per-Arne Gjelland, Karl øystein Tuomaala, Anti Malinen, Tommy Bøhn, Thomas Predation by brown trout (Salmo trutta) along a diversifying prey community gradient |
topic_facet |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 |
description |
Predation has a fundamental role in aquatic ecosystems, but the relative importance of factors governing prey selection by predators remains controversial. In this study, we contrast five lakes of a subarctic watershed to explore how prey community characteristics affect prey selection and growth rate of the common top predator, brown trout ( Salmo trutta ). The lakes constitute a distinct gradient of different coregonid prey fish, ranging from monomorphic common whitefish ( Coregonus lavaretus ) to polymorphic whitefish co-occurring with vendace ( Coregonus albula ). The brown trout was a morph–species- and size-specific pelagic predator, selecting the small-sized, pelagic whitefish morph or vendace over the benthic whitefish morphs. In all lakes, the average prey size increased with predator size, but small-sized prey were also included in the diet of large predators. The selection of small-sized, pelagic prey fish appeared to be a favourable foraging strategy for the brown trout, yielding higher growth rates and an earlier ontogenetic shift to piscivory. The findings emphasize that piscivory appear to be shaped by the diversity, size-structure, and abundance of available prey in a given community. |
format |
Article in Journal/Newspaper |
author |
Jensen, Hallvard Kahilainen, Kimmo K. Amundsen, Per-Arne Gjelland, Karl øystein Tuomaala, Anti Malinen, Tommy Bøhn, Thomas |
author_facet |
Jensen, Hallvard Kahilainen, Kimmo K. Amundsen, Per-Arne Gjelland, Karl øystein Tuomaala, Anti Malinen, Tommy Bøhn, Thomas |
author_sort |
Jensen, Hallvard |
title |
Predation by brown trout (Salmo trutta) along a diversifying prey community gradient |
title_short |
Predation by brown trout (Salmo trutta) along a diversifying prey community gradient |
title_full |
Predation by brown trout (Salmo trutta) along a diversifying prey community gradient |
title_fullStr |
Predation by brown trout (Salmo trutta) along a diversifying prey community gradient |
title_full_unstemmed |
Predation by brown trout (Salmo trutta) along a diversifying prey community gradient |
title_sort |
predation by brown trout (salmo trutta) along a diversifying prey community gradient |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
https://hdl.handle.net/10037/19320 https://doi.org/10.1139/F08-096 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
Canadian Journal of Fisheries and Aquatic Sciences Jensen, H., Kahilainen, K.K., Amundsen, P.-A., Gjelland, K.O., Tuomaala, A., Malinen, T. & Bøhn, T. (2008). Predation by brown trout ( Salmo trutta ) along a diversifying prey community gradient. Canadian Journal of Fisheries and Aquatic Sciences, 65 (9), 1831-1841. FRIDAID 337183 doi:10.1139/F08-096 0706-652X 1205-7533 https://hdl.handle.net/10037/19320 |
op_rights |
openAccess Copyright 2008 Canadian Science Publishing |
op_doi |
https://doi.org/10.1139/F08-096 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
65 |
container_issue |
9 |
container_start_page |
1831 |
op_container_end_page |
1841 |
_version_ |
1766210931580207104 |