Diel variation in activity and feeding in sympatric brown trout (Salmo trutta) and Arctic char (Salvelinus alpinus) throughout the ice-free season in a Norwegian lake
Most animals are active during distinct diel periods. Salmonid fishes may shift from being mostly diurnal to being nocturnal in autumn and winter. As visual foragers, diurnal variation in prey availability and predation risk may drive variation in their activity pattern. In an oligotrophic lake, we...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/578438 2024-09-15T18:00:08+00:00 Diel variation in activity and feeding in sympatric brown trout (Salmo trutta) and Arctic char (Salvelinus alpinus) throughout the ice-free season in a Norwegian lake L’Abée-Lund, J.H. Lo, H. Vøllestad, L.A. 2024-06-27T13:45:06Z 117-130 application/pdf http://hdl.handle.net/10138/578438 eng eng Boreal Environment Research Publishing Board Boreal Environment Research 1239-6095 1797-2469 27 http://hdl.handle.net/10138/578438 Suomen ympäristökeskus CC BY 4.0 openAccess Artikkeli lehdessä 2024 ftunivhelsihelda 2024-08-21T23:48:04Z Most animals are active during distinct diel periods. Salmonid fishes may shift from being mostly diurnal to being nocturnal in autumn and winter. As visual foragers, diurnal variation in prey availability and predation risk may drive variation in their activity pattern. In an oligotrophic lake, we studied diel activity and feeding of brown trout (Salmo trutta) and Arctic char (Salvelinus alpinus) using gill nets in the epibenthic habitat from May through October. Brown trout demonstrate an overall crepuscular activity pattern, whereas Arctic char demonstrate a more complex diel activity pattern. The variation in activity reflected the variation in stomach content in both species, with highest stomach-content mass in individuals sampled during night. Diet overlap of brown trout and Arctic char was high in early spring and reduced thereafter. Our results characterize both brown trout and Arctic char as indiscriminate particulate feeders and neither species had a diel change in their feeding mode. Article in Journal/Newspaper Boreal Environment Research Salvelinus alpinus HELDA – University of Helsinki Open Repository |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
description |
Most animals are active during distinct diel periods. Salmonid fishes may shift from being mostly diurnal to being nocturnal in autumn and winter. As visual foragers, diurnal variation in prey availability and predation risk may drive variation in their activity pattern. In an oligotrophic lake, we studied diel activity and feeding of brown trout (Salmo trutta) and Arctic char (Salvelinus alpinus) using gill nets in the epibenthic habitat from May through October. Brown trout demonstrate an overall crepuscular activity pattern, whereas Arctic char demonstrate a more complex diel activity pattern. The variation in activity reflected the variation in stomach content in both species, with highest stomach-content mass in individuals sampled during night. Diet overlap of brown trout and Arctic char was high in early spring and reduced thereafter. Our results characterize both brown trout and Arctic char as indiscriminate particulate feeders and neither species had a diel change in their feeding mode. |
format |
Article in Journal/Newspaper |
author |
L’Abée-Lund, J.H. Lo, H. Vøllestad, L.A. |
spellingShingle |
L’Abée-Lund, J.H. Lo, H. Vøllestad, L.A. Diel variation in activity and feeding in sympatric brown trout (Salmo trutta) and Arctic char (Salvelinus alpinus) throughout the ice-free season in a Norwegian lake |
author_facet |
L’Abée-Lund, J.H. Lo, H. Vøllestad, L.A. |
author_sort |
L’Abée-Lund, J.H. |
title |
Diel variation in activity and feeding in sympatric brown trout (Salmo trutta) and Arctic char (Salvelinus alpinus) throughout the ice-free season in a Norwegian lake |
title_short |
Diel variation in activity and feeding in sympatric brown trout (Salmo trutta) and Arctic char (Salvelinus alpinus) throughout the ice-free season in a Norwegian lake |
title_full |
Diel variation in activity and feeding in sympatric brown trout (Salmo trutta) and Arctic char (Salvelinus alpinus) throughout the ice-free season in a Norwegian lake |
title_fullStr |
Diel variation in activity and feeding in sympatric brown trout (Salmo trutta) and Arctic char (Salvelinus alpinus) throughout the ice-free season in a Norwegian lake |
title_full_unstemmed |
Diel variation in activity and feeding in sympatric brown trout (Salmo trutta) and Arctic char (Salvelinus alpinus) throughout the ice-free season in a Norwegian lake |
title_sort |
diel variation in activity and feeding in sympatric brown trout (salmo trutta) and arctic char (salvelinus alpinus) throughout the ice-free season in a norwegian lake |
publisher |
Boreal Environment Research Publishing Board |
publishDate |
2024 |
url |
http://hdl.handle.net/10138/578438 |
genre |
Boreal Environment Research Salvelinus alpinus |
genre_facet |
Boreal Environment Research Salvelinus alpinus |
op_relation |
Boreal Environment Research 1239-6095 1797-2469 27 http://hdl.handle.net/10138/578438 Suomen ympäristökeskus |
op_rights |
CC BY 4.0 openAccess |
_version_ |
1810437245158555648 |