Diel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cues
The timing of smolt migration is a key phenological trait with profound implications for individual survival during both river descent and the subsequent sea sojourn of anadromous fish. We studied relationships between the time of smolt migration, water temperature and light intensity for Atlantic s...
Published in: | Ecology of Freshwater Fish |
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Online Access: | http://hdl.handle.net/11250/2566564 https://doi.org/10.1111/eff.12298 |
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ftunivmob:oai:nmbu.brage.unit.no:11250/2566564 2024-09-15T17:55:50+00:00 Diel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cues Haraldstad, Tormod Kroglund, Frode Kristensen, Torstein Jonsson, Bror Haugen, Thrond O 2016-08-15T10:33:06Z application/pdf http://hdl.handle.net/11250/2566564 https://doi.org/10.1111/eff.12298 eng eng Miljødirektoratet: 05040029-6 Norges forskningsråd: 160016 Ecology of Freshwater Fish. 2017, 26 (4), 541-551. urn:issn:0906-6691 http://hdl.handle.net/11250/2566564 https://doi.org/10.1111/eff.12298 cristin:1372708 Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no 541-551 26 Ecology of Freshwater Fish 4 Journal article Peer reviewed 2016 ftunivmob https://doi.org/10.1111/eff.12298 2024-07-19T03:05:57Z The timing of smolt migration is a key phenological trait with profound implications for individual survival during both river descent and the subsequent sea sojourn of anadromous fish. We studied relationships between the time of smolt migration, water temperature and light intensity for Atlantic salmon (Salmo salar) and sea trout (Salmo trutta). During 2006–2012, migrating smolts descending the southern Norway River Storelva were caught in a rotary screw trap located at the river mouth. The date of 50% cumulative smolt descent correlated significantly with the date when the river temperature exceeded 8°C for both Atlantic salmon and sea trout smolts. In 2010, smolts of both species were passive integrated transponder (PIT)-tagged, and the diel timing of their migration was precisely documented. The degree of night migration decreased in both species as the river temperature rose, and at temperatures above 12–13°C, more smolts migrated during day than during night. A multinomial model was fitted for estimating temperature and species effects on probabilities of migration during night, daytime, dusk and dawn. Atlantic salmon smolts preferred migrating under lower light intensities than sea trout smolts during early, but not late spring when both species migrated during bright daylight. In accordance with the early-season tendency to migrate at night, Atlantic salmon smolts migrated more during darker hours of the day than sea trout. In both species, smaller smolts migrated under dark conditions than during light conditions. Most of the findings on thermal, light and temporal effects on the observed smolt migration pattern can be explained as adaptations to predation avoidance. migration timing, phenology, temperature influence, light intensities, anadromous fish, predation avoidance Diel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cues acceptedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar Open archive Norwegian University of Life Sciences: Brage NMBU Ecology of Freshwater Fish 26 4 541 551 |
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Open Polar |
collection |
Open archive Norwegian University of Life Sciences: Brage NMBU |
op_collection_id |
ftunivmob |
language |
English |
description |
The timing of smolt migration is a key phenological trait with profound implications for individual survival during both river descent and the subsequent sea sojourn of anadromous fish. We studied relationships between the time of smolt migration, water temperature and light intensity for Atlantic salmon (Salmo salar) and sea trout (Salmo trutta). During 2006–2012, migrating smolts descending the southern Norway River Storelva were caught in a rotary screw trap located at the river mouth. The date of 50% cumulative smolt descent correlated significantly with the date when the river temperature exceeded 8°C for both Atlantic salmon and sea trout smolts. In 2010, smolts of both species were passive integrated transponder (PIT)-tagged, and the diel timing of their migration was precisely documented. The degree of night migration decreased in both species as the river temperature rose, and at temperatures above 12–13°C, more smolts migrated during day than during night. A multinomial model was fitted for estimating temperature and species effects on probabilities of migration during night, daytime, dusk and dawn. Atlantic salmon smolts preferred migrating under lower light intensities than sea trout smolts during early, but not late spring when both species migrated during bright daylight. In accordance with the early-season tendency to migrate at night, Atlantic salmon smolts migrated more during darker hours of the day than sea trout. In both species, smaller smolts migrated under dark conditions than during light conditions. Most of the findings on thermal, light and temporal effects on the observed smolt migration pattern can be explained as adaptations to predation avoidance. migration timing, phenology, temperature influence, light intensities, anadromous fish, predation avoidance Diel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cues acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Haraldstad, Tormod Kroglund, Frode Kristensen, Torstein Jonsson, Bror Haugen, Thrond O |
spellingShingle |
Haraldstad, Tormod Kroglund, Frode Kristensen, Torstein Jonsson, Bror Haugen, Thrond O Diel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cues |
author_facet |
Haraldstad, Tormod Kroglund, Frode Kristensen, Torstein Jonsson, Bror Haugen, Thrond O |
author_sort |
Haraldstad, Tormod |
title |
Diel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cues |
title_short |
Diel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cues |
title_full |
Diel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cues |
title_fullStr |
Diel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cues |
title_full_unstemmed |
Diel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cues |
title_sort |
diel migration pattern of atlantic salmon (salmo salar) and sea trout (salmo trutta) smolts: an assessment of environmental cues |
publishDate |
2016 |
url |
http://hdl.handle.net/11250/2566564 https://doi.org/10.1111/eff.12298 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
541-551 26 Ecology of Freshwater Fish 4 |
op_relation |
Miljødirektoratet: 05040029-6 Norges forskningsråd: 160016 Ecology of Freshwater Fish. 2017, 26 (4), 541-551. urn:issn:0906-6691 http://hdl.handle.net/11250/2566564 https://doi.org/10.1111/eff.12298 cristin:1372708 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no |
op_doi |
https://doi.org/10.1111/eff.12298 |
container_title |
Ecology of Freshwater Fish |
container_volume |
26 |
container_issue |
4 |
container_start_page |
541 |
op_container_end_page |
551 |
_version_ |
1810432068680679424 |