Diel activity and foraging mode of juvenile Arctic charr in fluctuating water flow
Abstract Streams fluctuate in water flow because of natural (e.g., rain) and human‐induced events (e.g., hydropeaking). Magnitude, frequency, and predictability of these events can have drastic consequences for fish populations. We studied how rapid modifications of water flow affect diel activity a...
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crwiley:10.1002/rra.3256 2024-10-13T14:04:00+00:00 Diel activity and foraging mode of juvenile Arctic charr in fluctuating water flow Larranaga, N. Valdimarsson, S.K. Linnansaari, T. Steingrímsson, S.Ó. The Energy Research Fund Landsvirkjun The Icelandic Research Fund RANNIS 2018 http://dx.doi.org/10.1002/rra.3256 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Frra.3256 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.3256 en eng Wiley http://creativecommons.org/licenses/by/4.0/ River Research and Applications volume 34, issue 4, page 348-356 ISSN 1535-1459 1535-1467 journal-article 2018 crwiley https://doi.org/10.1002/rra.3256 2024-09-17T04:47:02Z Abstract Streams fluctuate in water flow because of natural (e.g., rain) and human‐induced events (e.g., hydropeaking). Magnitude, frequency, and predictability of these events can have drastic consequences for fish populations. We studied how rapid modifications of water flow affect diel activity and foraging mode of juvenile Arctic charr Salvelinus alpinus in stream enclosures exposed to either stable (intermediate) or fluctuating (low vs. high) water flow. Under stable conditions, Arctic charr showed limited activity (9.4%). In fluctuating water flow, charr increased activity during low flow periods, especially during the first hours after the flow decreased, but ceased activity almost completely at high flow. Charr were mostly nocturnal, and more nocturnal at low than intermediate water flow. Fish were more mobile and swam faster during prey search and attacked prey at longer distances at low water flow. Activity and foraging mode differed between the first and second day after reduced water flow, suggesting that Arctic charr require time to adjust their foraging behaviour. This study demonstrates the importance of behavioural flexibility for population ecology in fluctuating environments such as regulated rivers. Article in Journal/Newspaper Arctic charr Arctic Salvelinus alpinus Wiley Online Library Arctic River Research and Applications 34 4 348 356 |
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Wiley Online Library |
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English |
description |
Abstract Streams fluctuate in water flow because of natural (e.g., rain) and human‐induced events (e.g., hydropeaking). Magnitude, frequency, and predictability of these events can have drastic consequences for fish populations. We studied how rapid modifications of water flow affect diel activity and foraging mode of juvenile Arctic charr Salvelinus alpinus in stream enclosures exposed to either stable (intermediate) or fluctuating (low vs. high) water flow. Under stable conditions, Arctic charr showed limited activity (9.4%). In fluctuating water flow, charr increased activity during low flow periods, especially during the first hours after the flow decreased, but ceased activity almost completely at high flow. Charr were mostly nocturnal, and more nocturnal at low than intermediate water flow. Fish were more mobile and swam faster during prey search and attacked prey at longer distances at low water flow. Activity and foraging mode differed between the first and second day after reduced water flow, suggesting that Arctic charr require time to adjust their foraging behaviour. This study demonstrates the importance of behavioural flexibility for population ecology in fluctuating environments such as regulated rivers. |
author2 |
The Energy Research Fund Landsvirkjun The Icelandic Research Fund RANNIS |
format |
Article in Journal/Newspaper |
author |
Larranaga, N. Valdimarsson, S.K. Linnansaari, T. Steingrímsson, S.Ó. |
spellingShingle |
Larranaga, N. Valdimarsson, S.K. Linnansaari, T. Steingrímsson, S.Ó. Diel activity and foraging mode of juvenile Arctic charr in fluctuating water flow |
author_facet |
Larranaga, N. Valdimarsson, S.K. Linnansaari, T. Steingrímsson, S.Ó. |
author_sort |
Larranaga, N. |
title |
Diel activity and foraging mode of juvenile Arctic charr in fluctuating water flow |
title_short |
Diel activity and foraging mode of juvenile Arctic charr in fluctuating water flow |
title_full |
Diel activity and foraging mode of juvenile Arctic charr in fluctuating water flow |
title_fullStr |
Diel activity and foraging mode of juvenile Arctic charr in fluctuating water flow |
title_full_unstemmed |
Diel activity and foraging mode of juvenile Arctic charr in fluctuating water flow |
title_sort |
diel activity and foraging mode of juvenile arctic charr in fluctuating water flow |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/rra.3256 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Frra.3256 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.3256 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic charr Arctic Salvelinus alpinus |
genre_facet |
Arctic charr Arctic Salvelinus alpinus |
op_source |
River Research and Applications volume 34, issue 4, page 348-356 ISSN 1535-1459 1535-1467 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/rra.3256 |
container_title |
River Research and Applications |
container_volume |
34 |
container_issue |
4 |
container_start_page |
348 |
op_container_end_page |
356 |
_version_ |
1812809186897035264 |