Trophic interactions between introduced lake trout (Salvelinus namaycush) and native Arctic charr (S. alpinus) in a large Fennoscandian subarctic lake
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 Nor...
Published in: | Ecology of Freshwater Fish |
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WILEY-BLACKWELL MUNKSGAARD
2019
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/304756 2024-01-07T09:40:47+01:00 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. Environmental Sciences Kilpisjärvi Biological Station 2019-08-19T12:30:01Z 12 application/pdf http://hdl.handle.net/10138/304756 eng eng WILEY-BLACKWELL MUNKSGAARD 10.1111/eff.12132 We are grateful to Jouni Kervinen, Pekka Antti-Poika, Olli Saari and Viljami Kinnunen for help during the fieldwork and Tapio Aarnipuro for providing additional fish samples. We also thank Roger I. Jones for checking the grammar and two referees for their constructive comments on the manuscript. Muddusjarvi Research Station and the Municipality of Inari kindly provided fish processing facilities and equipment during the fieldwork. The study was supported by project grants from the Ministry of Agriculture and Forestry and Academy of Finland (140903), and by personal grants to APE from the Jenny and Antti Wihuri Foundation, the Ellen and Artturi Nyyssonen Foundation and the Ella and Georg Ehrnrooth Foundation, to PN from the Vanamo Biological Society of Finland and from the Olvi Foundation and to KKK from the European Regional Development Fund (A30205). Eloranta , A P , Nieminen , P & Kahilainen , K K 2015 , ' Trophic interactions between introduced lake trout (Salvelinus namaycush) and native Arctic charr (S. alpinus) in a large Fennoscandian subarctic lake ' , Ecology of Freshwater Fish , vol. 24 , no. 2 , pp. 181-192 . https://doi.org/10.1111/eff.12132 ORCID: /0000-0002-1539-014X/work/64323433 84924762051 b3d65fa0-7101-4374-aa45-bb3eeaade33b http://hdl.handle.net/10138/304756 000351349400002 cc_by openAccess info:eu-repo/semantics/openAccess Invasive species niche segregation piscivory predation resource competition stable isotope analysis VENDACE COREGONUS-ALBULA STABLE-ISOTOPES BROWN TROUT FOOD WEBS ADAPTIVE RADIATION YELLOWSTONE LAKE SALMO-TRUTTA FISH WHITEFISH IMPACTS 1181 Ecology evolutionary biology Article publishedVersion 2019 ftunivhelsihelda 2023-12-14T00:13:28Z 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 Inarijarvi in northern Finland. Both salmonids had predominantly piscivorous diets at >280mm 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 Inarijarvi. Future monitoring is essential to observe potential changes in trophic interactions between lake trout and Arctic charr in Inarijarvi, as well as in other European lakes where the two salmonids currently coexist. Peer reviewed Article in Journal/Newspaper Arctic Arctic charr Arctic Fennoscandian Northern Finland Subarctic HELDA – University of Helsinki Open Repository Arctic Ecology of Freshwater Fish 24 2 181 192 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Invasive species niche segregation piscivory predation resource competition stable isotope analysis VENDACE COREGONUS-ALBULA STABLE-ISOTOPES BROWN TROUT FOOD WEBS ADAPTIVE RADIATION YELLOWSTONE LAKE SALMO-TRUTTA FISH WHITEFISH IMPACTS 1181 Ecology evolutionary biology |
spellingShingle |
Invasive species niche segregation piscivory predation resource competition stable isotope analysis VENDACE COREGONUS-ALBULA STABLE-ISOTOPES BROWN TROUT FOOD WEBS ADAPTIVE RADIATION YELLOWSTONE LAKE SALMO-TRUTTA FISH WHITEFISH IMPACTS 1181 Ecology evolutionary biology 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 |
topic_facet |
Invasive species niche segregation piscivory predation resource competition stable isotope analysis VENDACE COREGONUS-ALBULA STABLE-ISOTOPES BROWN TROUT FOOD WEBS ADAPTIVE RADIATION YELLOWSTONE LAKE SALMO-TRUTTA FISH WHITEFISH IMPACTS 1181 Ecology evolutionary biology |
description |
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 Inarijarvi in northern Finland. Both salmonids had predominantly piscivorous diets at >280mm 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 Inarijarvi. Future monitoring is essential to observe potential changes in trophic interactions between lake trout and Arctic charr in Inarijarvi, as well as in other European lakes where the two salmonids currently coexist. Peer reviewed |
author2 |
Environmental Sciences Kilpisjärvi Biological Station |
format |
Article in Journal/Newspaper |
author |
Eloranta, Antti P. Nieminen, Petri Kahilainen, Kimmo K. |
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-BLACKWELL MUNKSGAARD |
publishDate |
2019 |
url |
http://hdl.handle.net/10138/304756 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic charr Arctic Fennoscandian Northern Finland Subarctic |
genre_facet |
Arctic Arctic charr Arctic Fennoscandian Northern Finland Subarctic |
op_relation |
10.1111/eff.12132 We are grateful to Jouni Kervinen, Pekka Antti-Poika, Olli Saari and Viljami Kinnunen for help during the fieldwork and Tapio Aarnipuro for providing additional fish samples. We also thank Roger I. Jones for checking the grammar and two referees for their constructive comments on the manuscript. Muddusjarvi Research Station and the Municipality of Inari kindly provided fish processing facilities and equipment during the fieldwork. The study was supported by project grants from the Ministry of Agriculture and Forestry and Academy of Finland (140903), and by personal grants to APE from the Jenny and Antti Wihuri Foundation, the Ellen and Artturi Nyyssonen Foundation and the Ella and Georg Ehrnrooth Foundation, to PN from the Vanamo Biological Society of Finland and from the Olvi Foundation and to KKK from the European Regional Development Fund (A30205). Eloranta , A P , Nieminen , P & Kahilainen , K K 2015 , ' Trophic interactions between introduced lake trout (Salvelinus namaycush) and native Arctic charr (S. alpinus) in a large Fennoscandian subarctic lake ' , Ecology of Freshwater Fish , vol. 24 , no. 2 , pp. 181-192 . https://doi.org/10.1111/eff.12132 ORCID: /0000-0002-1539-014X/work/64323433 84924762051 b3d65fa0-7101-4374-aa45-bb3eeaade33b http://hdl.handle.net/10138/304756 000351349400002 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
container_title |
Ecology of Freshwater Fish |
container_volume |
24 |
container_issue |
2 |
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181 |
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192 |
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1787421581419479040 |