Ice‐dependent winter survival of juvenile Atlantic salmon
Abstract Changes in snow and ice conditions are some of the most distinctive impacts of global warming in cold temperate and Arctic regions, altering the environment during a critical period for survival for most animals. Laboratories studies have suggested that reduced ice cover may reduce the surv...
Published in: | Ecology and Evolution |
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crwiley:10.1002/ece3.481 2024-06-23T07:50:40+00:00 Ice‐dependent winter survival of juvenile Atlantic salmon Hedger, R. D. Næsje, T. F. Fiske, P. Ugedal, O. Finstad, A. G. Thorstad, E. B. 2013 http://dx.doi.org/10.1002/ece3.481 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.481 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.481 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.481 en eng Wiley http://creativecommons.org/licenses/by/3.0/ Ecology and Evolution volume 3, issue 3, page 523-535 ISSN 2045-7758 2045-7758 journal-article 2013 crwiley https://doi.org/10.1002/ece3.481 2024-06-11T04:41:10Z Abstract Changes in snow and ice conditions are some of the most distinctive impacts of global warming in cold temperate and Arctic regions, altering the environment during a critical period for survival for most animals. Laboratories studies have suggested that reduced ice cover may reduce the survival of stream dwelling fishes in Northern environments. This, however, has not been empirically investigated in natural populations in large rivers. Here, we examine how the winter survival of juvenile Atlantic salmon in a large natural river, the River Alta (Norway, 70°N), is affected by the presence or absence of surface ice. Apparent survival rates for size classes corresponding to parr and presmolts were estimated using capture‐mark‐recapture and Cormack‐Jolly‐Seber models for an ice‐covered and an ice‐free site. Apparent survival (Φ) in the ice‐covered site was greater than in the ice‐free site, but did not depend on size class (0.64 for both parr and presmolt). In contrast, apparent survival in the ice‐free site was lower for larger individuals (0.33) than smaller individuals (0.45). The over‐winter decline in storage energy was greater for the ice‐free site than the ice‐covered site, suggesting that environmental conditions in the ice‐free site caused a strong depletion in energy reserves likely affecting survival. Our findings highlight the importance of surface ice for the winter survival of juvenile fish, thus, underpinning that climate change, by reducing ice cover, may have a negative effect on the survival of fish adapted to ice‐covered habitats during winter. Article in Journal/Newspaper Arctic Atlantic salmon Climate change Global warming Wiley Online Library Alta Arctic Norway Ecology and Evolution 3 3 523 535 |
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Wiley Online Library |
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English |
description |
Abstract Changes in snow and ice conditions are some of the most distinctive impacts of global warming in cold temperate and Arctic regions, altering the environment during a critical period for survival for most animals. Laboratories studies have suggested that reduced ice cover may reduce the survival of stream dwelling fishes in Northern environments. This, however, has not been empirically investigated in natural populations in large rivers. Here, we examine how the winter survival of juvenile Atlantic salmon in a large natural river, the River Alta (Norway, 70°N), is affected by the presence or absence of surface ice. Apparent survival rates for size classes corresponding to parr and presmolts were estimated using capture‐mark‐recapture and Cormack‐Jolly‐Seber models for an ice‐covered and an ice‐free site. Apparent survival (Φ) in the ice‐covered site was greater than in the ice‐free site, but did not depend on size class (0.64 for both parr and presmolt). In contrast, apparent survival in the ice‐free site was lower for larger individuals (0.33) than smaller individuals (0.45). The over‐winter decline in storage energy was greater for the ice‐free site than the ice‐covered site, suggesting that environmental conditions in the ice‐free site caused a strong depletion in energy reserves likely affecting survival. Our findings highlight the importance of surface ice for the winter survival of juvenile fish, thus, underpinning that climate change, by reducing ice cover, may have a negative effect on the survival of fish adapted to ice‐covered habitats during winter. |
format |
Article in Journal/Newspaper |
author |
Hedger, R. D. Næsje, T. F. Fiske, P. Ugedal, O. Finstad, A. G. Thorstad, E. B. |
spellingShingle |
Hedger, R. D. Næsje, T. F. Fiske, P. Ugedal, O. Finstad, A. G. Thorstad, E. B. Ice‐dependent winter survival of juvenile Atlantic salmon |
author_facet |
Hedger, R. D. Næsje, T. F. Fiske, P. Ugedal, O. Finstad, A. G. Thorstad, E. B. |
author_sort |
Hedger, R. D. |
title |
Ice‐dependent winter survival of juvenile Atlantic salmon |
title_short |
Ice‐dependent winter survival of juvenile Atlantic salmon |
title_full |
Ice‐dependent winter survival of juvenile Atlantic salmon |
title_fullStr |
Ice‐dependent winter survival of juvenile Atlantic salmon |
title_full_unstemmed |
Ice‐dependent winter survival of juvenile Atlantic salmon |
title_sort |
ice‐dependent winter survival of juvenile atlantic salmon |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1002/ece3.481 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.481 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.481 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.481 |
geographic |
Alta Arctic Norway |
geographic_facet |
Alta Arctic Norway |
genre |
Arctic Atlantic salmon Climate change Global warming |
genre_facet |
Arctic Atlantic salmon Climate change Global warming |
op_source |
Ecology and Evolution volume 3, issue 3, page 523-535 ISSN 2045-7758 2045-7758 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.1002/ece3.481 |
container_title |
Ecology and Evolution |
container_volume |
3 |
container_issue |
3 |
container_start_page |
523 |
op_container_end_page |
535 |
_version_ |
1802641581421887488 |