Trophic interactions between introduced lake trout ( Salvelinus namaycush) and native Arctic charr ( S. alpinus) in a large Fennoscandian subarctic lake
Abstract Introduced fishes may have major impacts on community structure and ecosystem function due to competitive and predatory interactions with native species. For example, introduced lake trout ( Salvelinus namaycush ) has been shown to replace native salmonids and induce major trophic cascades...
Published in: | Ecology of Freshwater Fish |
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crwiley:10.1111/eff.12132 2024-09-15T17:52:19+00:00 Trophic interactions between introduced lake trout ( Salvelinus namaycush) and native Arctic charr ( S. alpinus) in a large Fennoscandian subarctic lake Eloranta, Antti P. Nieminen, Petri Kahilainen, Kimmo K. The Ella and Georg Ehrnrooth Foundation The Ellen and Artturi Nyyss�nen Founadtion the Jenny and Antti Wihuri Foundation 2014 http://dx.doi.org/10.1111/eff.12132 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12132 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12132 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ecology of Freshwater Fish volume 24, issue 2, page 181-192 ISSN 0906-6691 1600-0633 journal-article 2014 crwiley https://doi.org/10.1111/eff.12132 2024-09-03T04:26:28Z Abstract Introduced fishes may have major impacts on community structure and ecosystem function due to competitive and predatory interactions with native species. For example, introduced lake trout ( Salvelinus namaycush ) has been shown to replace native salmonids and induce major trophic cascades in some North American lakes, but few studies have investigated trophic interactions between lake trout and closely related native Arctic charr ( S. alpinus ) outside the natural distribution of the former species. We used stomach content and stable isotope analyses to investigate trophic interactions between introduced lake trout and native Arctic charr in large subarctic Lake Inarijärvi in northern Finland. Both salmonids had predominantly piscivorous diets at >280 mm total length and were mainly caught from the deep profundal zone. However, lake trout had a more generalist diet and showed higher reliance on littoral prey fish than Arctic charr, whose diet consisted mainly of pelagic planktivorous coregonids. According to length at age and condition data, lake trout showed slightly faster growth but lower condition than Arctic charr. The results indicate that introduced lake trout may to some extent compete with and prey upon native Arctic charr, but currently have only a minor if any impact on native fishes and food web structure in Inarijärvi. Future monitoring is essential to observe potential changes in trophic interactions between lake trout and Arctic charr in Inarijärvi, as well as in other European lakes where the two salmonids currently coexist. Article in Journal/Newspaper Arctic charr Fennoscandian Inarijärvi Northern Finland Subarctic Wiley Online Library Ecology of Freshwater Fish 24 2 181 192 |
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Wiley Online Library |
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English |
description |
Abstract Introduced fishes may have major impacts on community structure and ecosystem function due to competitive and predatory interactions with native species. For example, introduced lake trout ( Salvelinus namaycush ) has been shown to replace native salmonids and induce major trophic cascades in some North American lakes, but few studies have investigated trophic interactions between lake trout and closely related native Arctic charr ( S. alpinus ) outside the natural distribution of the former species. We used stomach content and stable isotope analyses to investigate trophic interactions between introduced lake trout and native Arctic charr in large subarctic Lake Inarijärvi in northern Finland. Both salmonids had predominantly piscivorous diets at >280 mm total length and were mainly caught from the deep profundal zone. However, lake trout had a more generalist diet and showed higher reliance on littoral prey fish than Arctic charr, whose diet consisted mainly of pelagic planktivorous coregonids. According to length at age and condition data, lake trout showed slightly faster growth but lower condition than Arctic charr. The results indicate that introduced lake trout may to some extent compete with and prey upon native Arctic charr, but currently have only a minor if any impact on native fishes and food web structure in Inarijärvi. Future monitoring is essential to observe potential changes in trophic interactions between lake trout and Arctic charr in Inarijärvi, as well as in other European lakes where the two salmonids currently coexist. |
author2 |
The Ella and Georg Ehrnrooth Foundation The Ellen and Artturi Nyyss�nen Founadtion the Jenny and Antti Wihuri Foundation |
format |
Article in Journal/Newspaper |
author |
Eloranta, Antti P. Nieminen, Petri Kahilainen, Kimmo K. |
spellingShingle |
Eloranta, Antti P. Nieminen, Petri Kahilainen, Kimmo K. Trophic interactions between introduced lake trout ( Salvelinus namaycush) and native Arctic charr ( S. alpinus) in a large Fennoscandian subarctic lake |
author_facet |
Eloranta, Antti P. Nieminen, Petri Kahilainen, Kimmo K. |
author_sort |
Eloranta, Antti P. |
title |
Trophic interactions between introduced lake trout ( Salvelinus namaycush) and native Arctic charr ( S. alpinus) in a large Fennoscandian subarctic lake |
title_short |
Trophic interactions between introduced lake trout ( Salvelinus namaycush) and native Arctic charr ( S. alpinus) in a large Fennoscandian subarctic lake |
title_full |
Trophic interactions between introduced lake trout ( Salvelinus namaycush) and native Arctic charr ( S. alpinus) in a large Fennoscandian subarctic lake |
title_fullStr |
Trophic interactions between introduced lake trout ( Salvelinus namaycush) and native Arctic charr ( S. alpinus) in a large Fennoscandian subarctic lake |
title_full_unstemmed |
Trophic interactions between introduced lake trout ( Salvelinus namaycush) and native Arctic charr ( S. alpinus) in a large Fennoscandian subarctic lake |
title_sort |
trophic interactions between introduced lake trout ( salvelinus namaycush) and native arctic charr ( s. alpinus) in a large fennoscandian subarctic lake |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1111/eff.12132 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12132 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12132 |
genre |
Arctic charr Fennoscandian Inarijärvi Northern Finland Subarctic |
genre_facet |
Arctic charr Fennoscandian Inarijärvi Northern Finland Subarctic |
op_source |
Ecology of Freshwater Fish volume 24, issue 2, page 181-192 ISSN 0906-6691 1600-0633 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/eff.12132 |
container_title |
Ecology of Freshwater Fish |
container_volume |
24 |
container_issue |
2 |
container_start_page |
181 |
op_container_end_page |
192 |
_version_ |
1810294373772951552 |