dc.contributor |
Háskólinn á Hólum |
dc.contributor |
Hólar University College |
dc.contributor |
Háskóli Íslands |
dc.contributor |
University of Iceland |
dc.contributor.author |
Larranaga, Nicolas |
dc.contributor.author |
Valdimarsson, S.K. |
dc.contributor.author |
Linnansaari, T. |
dc.contributor.author |
Steingrímsson, Stefán Óli |
dc.date.accessioned |
2019-01-14T15:43:02Z |
dc.date.available |
2019-01-14T15:43:02Z |
dc.date.issued |
2018-02-28 |
dc.identifier.citation |
Larranaga, N., Valdimarsson, S. K., Linnansaari, T., & Steingrímsson, S. Ó. (2018). Diel activity and foraging mode of juvenile Arctic charr in fluctuating water flow. River Research and Applications, 34(4), 348-356. doi:doi:10.1002/rra.3256 |
dc.identifier.issn |
1535-1459 |
dc.identifier.issn |
1535-1467 (eISSN) |
dc.identifier.uri |
https://hdl.handle.net/20.500.11815/977 |
dc.description |
Publisher's version (útgefin grein) |
dc.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. |
dc.description.sponsorship |
This work was supported by the Icelandic Research Fund RANNIS (120235021) and The Energy Research Fund Landsvirkjun. |
dc.format.extent |
348-356 |
dc.language.iso |
en |
dc.publisher |
Wiley |
dc.relation.ispartofseries |
River Research and Applications;34(4) |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Behavioural flexibility |
dc.subject |
Current velocity |
dc.subject |
Hydropeaking |
dc.subject |
Salvelinus alpinus |
dc.subject |
Stream enclosures |
dc.subject |
Bleikja |
dc.subject |
Vatnafar |
dc.subject |
Vistfræði |
dc.title |
Diel activity and foraging mode of juvenile Arctic charr in fluctuating water flow |
dc.type |
info:eu-repo/semantics/article |
dcterms.license |
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
dc.description.version |
Peer Reviewed |
dc.identifier.journal |
River Research and Applications |
dc.identifier.doi |
10.1002/rra.3256 |
dc.contributor.department |
Fiskeldis- og fiskalíffræðideild (HH) |
dc.contributor.department |
Department of Aquaculture and Fish Biology (HUC) |
dc.contributor.department |
Líf- og umhverfisvísindastofnun (HÍ) |
dc.contributor.department |
Institute of Life and Environmental Sciences (UI) |
dc.contributor.school |
Verkfræði- og náttúruvísindasvið (HÍ) |
dc.contributor.school |
School of Engineering and Natural Sciences (UI) |