Trophic ecology of brown trout ( Salmo trutta L.) in subarctic lakes
Abstract In subarctic lake systems, fish species like brown trout are often important predators, and their niche performance is a key characteristic for understanding trophic interactions and food web functioning at upper trophic levels. Here, we studied summer habitat use and stomach contents of br...
Published in: | Ecology of Freshwater Fish |
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crwiley:10.1111/eff.12139 2024-06-02T08:00:06+00:00 Trophic ecology of brown trout ( Salmo trutta L.) in subarctic lakes Sánchez‐Hernández, Javier Amundsen, Per‐Arne Norwegian Research Council 2014 http://dx.doi.org/10.1111/eff.12139 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12139 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12139 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ecology of Freshwater Fish volume 24, issue 1, page 148-161 ISSN 0906-6691 1600-0633 journal-article 2014 crwiley https://doi.org/10.1111/eff.12139 2024-05-03T11:34:56Z Abstract In subarctic lake systems, fish species like brown trout are often important predators, and their niche performance is a key characteristic for understanding trophic interactions and food web functioning at upper trophic levels. Here, we studied summer habitat use and stomach contents of brown trout under both allopatric and sympatric conditions in six subarctic lakes to reveal its trophic role, and population‐ and individual‐level niche plasticity. In allopatry, brown trout mainly used the littoral habitat, but also less commonly used the pelagic zone. In sympatry with stickleback, there was always a considerable habitat overlap between the two species. In contrast, sympatric populations of brown trout and Arctic charr generally revealed a distinct habitat segregation. In the sympatric systems, in general, there was a distinct resource partitioning between the trout and charr, whereas the observed diet overlap between trout and stickleback was much larger. Trout modified their individual dietary specialisation between the littoral and pelagic zone, always being lower in the pelagic. Piscivorous behaviour of trout was only found in sympatric systems, possibly contributing to a competitive advantage of trout over charr and stickleback. Hence, the trophic level of trout was strongly related to the fish community composition, with a higher trophic level in sympatric systems where piscivorous behaviour was frequent. These changes in the trophic level of trout linked with the observed food resource partitioning might be an important mechanism in the ecosystem functioning of subarctic lakes to allow coexistence among sympatric‐living fish species. Article in Journal/Newspaper Arctic charr Arctic Subarctic Wiley Online Library Arctic Ecology of Freshwater Fish 24 1 148 161 |
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English |
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Abstract In subarctic lake systems, fish species like brown trout are often important predators, and their niche performance is a key characteristic for understanding trophic interactions and food web functioning at upper trophic levels. Here, we studied summer habitat use and stomach contents of brown trout under both allopatric and sympatric conditions in six subarctic lakes to reveal its trophic role, and population‐ and individual‐level niche plasticity. In allopatry, brown trout mainly used the littoral habitat, but also less commonly used the pelagic zone. In sympatry with stickleback, there was always a considerable habitat overlap between the two species. In contrast, sympatric populations of brown trout and Arctic charr generally revealed a distinct habitat segregation. In the sympatric systems, in general, there was a distinct resource partitioning between the trout and charr, whereas the observed diet overlap between trout and stickleback was much larger. Trout modified their individual dietary specialisation between the littoral and pelagic zone, always being lower in the pelagic. Piscivorous behaviour of trout was only found in sympatric systems, possibly contributing to a competitive advantage of trout over charr and stickleback. Hence, the trophic level of trout was strongly related to the fish community composition, with a higher trophic level in sympatric systems where piscivorous behaviour was frequent. These changes in the trophic level of trout linked with the observed food resource partitioning might be an important mechanism in the ecosystem functioning of subarctic lakes to allow coexistence among sympatric‐living fish species. |
author2 |
Norwegian Research Council |
format |
Article in Journal/Newspaper |
author |
Sánchez‐Hernández, Javier Amundsen, Per‐Arne |
spellingShingle |
Sánchez‐Hernández, Javier Amundsen, Per‐Arne Trophic ecology of brown trout ( Salmo trutta L.) in subarctic lakes |
author_facet |
Sánchez‐Hernández, Javier Amundsen, Per‐Arne |
author_sort |
Sánchez‐Hernández, Javier |
title |
Trophic ecology of brown trout ( Salmo trutta L.) in subarctic lakes |
title_short |
Trophic ecology of brown trout ( Salmo trutta L.) in subarctic lakes |
title_full |
Trophic ecology of brown trout ( Salmo trutta L.) in subarctic lakes |
title_fullStr |
Trophic ecology of brown trout ( Salmo trutta L.) in subarctic lakes |
title_full_unstemmed |
Trophic ecology of brown trout ( Salmo trutta L.) in subarctic lakes |
title_sort |
trophic ecology of brown trout ( salmo trutta l.) in subarctic lakes |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1111/eff.12139 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12139 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12139 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic charr Arctic Subarctic |
genre_facet |
Arctic charr Arctic Subarctic |
op_source |
Ecology of Freshwater Fish volume 24, issue 1, page 148-161 ISSN 0906-6691 1600-0633 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/eff.12139 |
container_title |
Ecology of Freshwater Fish |
container_volume |
24 |
container_issue |
1 |
container_start_page |
148 |
op_container_end_page |
161 |
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1800744118666657792 |