Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon (Salmo salar) smolts migrating through lakes
Smolt migration through lakes is hazardous, as the predation pressure can be extreme and the hydrology a great contrast to that of a riverine area. However, the mechanisms yielding these challenges have been scarcely investigated. We conducted an acoustic telemetry field study in Lake Evangervatnet,...
Published in: | Ecology of Freshwater Fish |
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Online Access: | https://hdl.handle.net/11250/2990750 https://doi.org/10.1111/eff.12641 |
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ftunivbergen:oai:bora.uib.no:11250/2990750 2023-05-15T15:30:56+02:00 Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon (Salmo salar) smolts migrating through lakes Hanssen, Erlend Mjelde Vollset, Knut Wiik Salvanes, Anne Gro Vea Barlaup, Bjørn Whoriskey, Kim Isaksen, Trond Einar Normann, Eirik Straume Hulbak, Magnus Andre Lennox, Robert 2021 application/pdf https://hdl.handle.net/11250/2990750 https://doi.org/10.1111/eff.12641 eng eng Wiley Norges forskningsråd: 320726 urn:issn:0906-6691 https://hdl.handle.net/11250/2990750 https://doi.org/10.1111/eff.12641 cristin:1963059 Ecology of Freshwater Fish. 2021, 31(2), 424-437. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2021 The Author(s) Ecology of Freshwater Fish 424-437 31 2 Journal article Peer reviewed 2021 ftunivbergen https://doi.org/10.1111/eff.12641 2023-03-14T17:41:11Z Smolt migration through lakes is hazardous, as the predation pressure can be extreme and the hydrology a great contrast to that of a riverine area. However, the mechanisms yielding these challenges have been scarcely investigated. We conducted an acoustic telemetry field study in Lake Evangervatnet, Voss, Norway, utilising Vemco V5 predation tags. Atlantic salmon (Salmo salar) smolts (N = 20) were tagged with the novel predation sensor tag to investigate mortality, the lacustrine migration behaviour of smolts, and the applicability of these tags for smolt studies. A total of 60% of tagged Atlantic salmon (Salmo salar) smolts perished in the lake. Half of the mortalities (30% of tagged fish) were directly attributed to predation by brown trout (Salmo trutta) based on predation sensors. The surviving smolts were slow to traverse the 6.5 km lake, with progression rate between lake inlet and outlet on average 0.016 m/s over a mean of 7.9 ± 6.2 (SD) days. Acoustic detections revealed a consistent pattern of nocturnal migration and multidirectional movements within the lake. By running a series of correlated random walks under varying parameters and comparing the simulated travel times to the observed travel time used by the tagged smolts, we emulated the observed behaviour of the smolts. These simulations suggested that smolts lacked the ability to efficiently navigate through the lake, instead swimming in random directions until they reached the lake outlet. Predation sensors can offer improved resolution when tracking the behaviour and fate of smolts and can facilitate better mitigation efforts by identifying survival bottlenecks and separating predation from non-predatory mortality. publishedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar University of Bergen: Bergen Open Research Archive (BORA-UiB) Lake Inlet ENVELOPE(-133.970,-133.970,59.199,59.199) Norway Ecology of Freshwater Fish 31 2 424 437 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Smolt migration through lakes is hazardous, as the predation pressure can be extreme and the hydrology a great contrast to that of a riverine area. However, the mechanisms yielding these challenges have been scarcely investigated. We conducted an acoustic telemetry field study in Lake Evangervatnet, Voss, Norway, utilising Vemco V5 predation tags. Atlantic salmon (Salmo salar) smolts (N = 20) were tagged with the novel predation sensor tag to investigate mortality, the lacustrine migration behaviour of smolts, and the applicability of these tags for smolt studies. A total of 60% of tagged Atlantic salmon (Salmo salar) smolts perished in the lake. Half of the mortalities (30% of tagged fish) were directly attributed to predation by brown trout (Salmo trutta) based on predation sensors. The surviving smolts were slow to traverse the 6.5 km lake, with progression rate between lake inlet and outlet on average 0.016 m/s over a mean of 7.9 ± 6.2 (SD) days. Acoustic detections revealed a consistent pattern of nocturnal migration and multidirectional movements within the lake. By running a series of correlated random walks under varying parameters and comparing the simulated travel times to the observed travel time used by the tagged smolts, we emulated the observed behaviour of the smolts. These simulations suggested that smolts lacked the ability to efficiently navigate through the lake, instead swimming in random directions until they reached the lake outlet. Predation sensors can offer improved resolution when tracking the behaviour and fate of smolts and can facilitate better mitigation efforts by identifying survival bottlenecks and separating predation from non-predatory mortality. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Hanssen, Erlend Mjelde Vollset, Knut Wiik Salvanes, Anne Gro Vea Barlaup, Bjørn Whoriskey, Kim Isaksen, Trond Einar Normann, Eirik Straume Hulbak, Magnus Andre Lennox, Robert |
spellingShingle |
Hanssen, Erlend Mjelde Vollset, Knut Wiik Salvanes, Anne Gro Vea Barlaup, Bjørn Whoriskey, Kim Isaksen, Trond Einar Normann, Eirik Straume Hulbak, Magnus Andre Lennox, Robert Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon (Salmo salar) smolts migrating through lakes |
author_facet |
Hanssen, Erlend Mjelde Vollset, Knut Wiik Salvanes, Anne Gro Vea Barlaup, Bjørn Whoriskey, Kim Isaksen, Trond Einar Normann, Eirik Straume Hulbak, Magnus Andre Lennox, Robert |
author_sort |
Hanssen, Erlend Mjelde |
title |
Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon (Salmo salar) smolts migrating through lakes |
title_short |
Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon (Salmo salar) smolts migrating through lakes |
title_full |
Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon (Salmo salar) smolts migrating through lakes |
title_fullStr |
Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon (Salmo salar) smolts migrating through lakes |
title_full_unstemmed |
Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon (Salmo salar) smolts migrating through lakes |
title_sort |
acoustic telemetry predation sensors reveal the tribulations of atlantic salmon (salmo salar) smolts migrating through lakes |
publisher |
Wiley |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2990750 https://doi.org/10.1111/eff.12641 |
long_lat |
ENVELOPE(-133.970,-133.970,59.199,59.199) |
geographic |
Lake Inlet Norway |
geographic_facet |
Lake Inlet Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Ecology of Freshwater Fish 424-437 31 2 |
op_relation |
Norges forskningsråd: 320726 urn:issn:0906-6691 https://hdl.handle.net/11250/2990750 https://doi.org/10.1111/eff.12641 cristin:1963059 Ecology of Freshwater Fish. 2021, 31(2), 424-437. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2021 The Author(s) |
op_doi |
https://doi.org/10.1111/eff.12641 |
container_title |
Ecology of Freshwater Fish |
container_volume |
31 |
container_issue |
2 |
container_start_page |
424 |
op_container_end_page |
437 |
_version_ |
1766361404797878272 |