Trophic interactions between introduced lake trout (Salvelinus namaycush) and native Arctic charr (S. alpinus) in a large Fennoscandian subarctic lake

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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

Title: Trophic interactions between introduced lake trout (Salvelinus namaycush) and native Arctic charr (S. alpinus) in a large Fennoscandian subarctic lake
Author: Eloranta, Antti P.; Nieminen, Petri; Kahilainen, Kimmo K.
Other contributor: University of Helsinki, Environmental Sciences

Date: 2015-04
Language: eng
Number of pages: 12
Belongs to series: Ecology of Freshwater Fish
ISSN: 0906-6691
DOI: https://doi.org/10.1111/eff.12132
URI: http://hdl.handle.net/10138/304756
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 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.
Subject: 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
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