Environmental and anthropogenic correlates of migratory speeds among Atlantic salmon smolts
Abstract Dams, weirs, and hydropower facilities are often cited as migratory barriers which impart significant reductions in fitness among migratory fish species. Even where upstream and downstream passage options are available, barrier passage can still often result in energetic or physical costs w...
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crwiley:10.1002/rra.3760 2024-06-02T08:03:34+00:00 Environmental and anthropogenic correlates of migratory speeds among Atlantic salmon smolts Harbicht, Andrew B. Nilsson, P. Anders Österling, Martin Calles, Olle Stiftelsen för Kunskaps- och Kompetensutveckling 2020 http://dx.doi.org/10.1002/rra.3760 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.3760 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/rra.3760 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ River Research and Applications volume 37, issue 3, page 358-372 ISSN 1535-1459 1535-1467 journal-article 2020 crwiley https://doi.org/10.1002/rra.3760 2024-05-03T12:00:43Z Abstract Dams, weirs, and hydropower facilities are often cited as migratory barriers which impart significant reductions in fitness among migratory fish species. Even where upstream and downstream passage options are available, barrier passage can still often result in energetic or physical costs which compound delays or cause mortality. Past studies have identified variables associated with such fitness reductions, though few examine their effects in the context of the whole river scale. To this end, we assessed the migratory rates and downstream passage of radio‐tagged Atlantic salmon ( Salmo salar ) smolts through nine river sections (including two reservoir sections and one dammed section) along a 20 km stretch of river. Migration stoppages were not found to be elevated in reservoir or dammed sections, while migration rates were best described by physical river properties (width), biological traits (smolt total length), and seasonal variables (diel period) rather than anthropogenic factors. These results suggest the negative effect of reservoirs may primarily be due to their influence on river width and may be negligible when width is largely unaffected by an impoundment. Similarly, spilling water during fish migrations as a mitigative measure appears to make delays negligible. These conditions and actions may not completely marginalize the effect of dams, however, as a negative trend was still observed resulting from passage effects at the dam. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library River Research and Applications 37 3 358 372 |
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Wiley Online Library |
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English |
description |
Abstract Dams, weirs, and hydropower facilities are often cited as migratory barriers which impart significant reductions in fitness among migratory fish species. Even where upstream and downstream passage options are available, barrier passage can still often result in energetic or physical costs which compound delays or cause mortality. Past studies have identified variables associated with such fitness reductions, though few examine their effects in the context of the whole river scale. To this end, we assessed the migratory rates and downstream passage of radio‐tagged Atlantic salmon ( Salmo salar ) smolts through nine river sections (including two reservoir sections and one dammed section) along a 20 km stretch of river. Migration stoppages were not found to be elevated in reservoir or dammed sections, while migration rates were best described by physical river properties (width), biological traits (smolt total length), and seasonal variables (diel period) rather than anthropogenic factors. These results suggest the negative effect of reservoirs may primarily be due to their influence on river width and may be negligible when width is largely unaffected by an impoundment. Similarly, spilling water during fish migrations as a mitigative measure appears to make delays negligible. These conditions and actions may not completely marginalize the effect of dams, however, as a negative trend was still observed resulting from passage effects at the dam. |
author2 |
Stiftelsen för Kunskaps- och Kompetensutveckling |
format |
Article in Journal/Newspaper |
author |
Harbicht, Andrew B. Nilsson, P. Anders Österling, Martin Calles, Olle |
spellingShingle |
Harbicht, Andrew B. Nilsson, P. Anders Österling, Martin Calles, Olle Environmental and anthropogenic correlates of migratory speeds among Atlantic salmon smolts |
author_facet |
Harbicht, Andrew B. Nilsson, P. Anders Österling, Martin Calles, Olle |
author_sort |
Harbicht, Andrew B. |
title |
Environmental and anthropogenic correlates of migratory speeds among Atlantic salmon smolts |
title_short |
Environmental and anthropogenic correlates of migratory speeds among Atlantic salmon smolts |
title_full |
Environmental and anthropogenic correlates of migratory speeds among Atlantic salmon smolts |
title_fullStr |
Environmental and anthropogenic correlates of migratory speeds among Atlantic salmon smolts |
title_full_unstemmed |
Environmental and anthropogenic correlates of migratory speeds among Atlantic salmon smolts |
title_sort |
environmental and anthropogenic correlates of migratory speeds among atlantic salmon smolts |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/rra.3760 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.3760 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/rra.3760 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
River Research and Applications volume 37, issue 3, page 358-372 ISSN 1535-1459 1535-1467 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1002/rra.3760 |
container_title |
River Research and Applications |
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37 |
container_issue |
3 |
container_start_page |
358 |
op_container_end_page |
372 |
_version_ |
1800748128302792704 |