Ice-dependent winter survival of juvenile Atlantic salmon
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 s...
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2013
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3605843 http://www.ncbi.nlm.nih.gov/pubmed/23532172 https://doi.org/10.1002/ece3.481 |
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ftpubmed:oai:pubmedcentral.nih.gov:3605843 2023-05-15T15:10:55+02:00 Ice-dependent winter survival of juvenile Atlantic salmon Hedger, R D Næsje, T F Fiske, P Ugedal, O Finstad, A G Thorstad, E B 2013-03 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3605843 http://www.ncbi.nlm.nih.gov/pubmed/23532172 https://doi.org/10.1002/ece3.481 en eng Blackwell Publishing Ltd http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3605843 http://www.ncbi.nlm.nih.gov/pubmed/23532172 http://dx.doi.org/10.1002/ece3.481 © 2013 Published by Blackwell Publishing Ltd. http://creativecommons.org/licenses/by/2.5/ Re-use of this article is permitted in accordance with the Creative Commons Deed, Attribution 2.5, which does not permit commercial exploitation. CC-BY Original Research Text 2013 ftpubmed https://doi.org/10.1002/ece3.481 2013-09-04T21:31:10Z 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. Text Arctic Atlantic salmon Climate change Global warming PubMed Central (PMC) Alta Arctic Norway Ecology and Evolution 3 3 523 535 |
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English |
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Original Research |
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Original Research Hedger, R D Næsje, T F Fiske, P Ugedal, O Finstad, A G Thorstad, E B Ice-dependent winter survival of juvenile Atlantic salmon |
topic_facet |
Original Research |
description |
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 |
Text |
author |
Hedger, R D Næsje, T F Fiske, P Ugedal, O Finstad, A G Thorstad, E B |
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 |
Blackwell Publishing Ltd |
publishDate |
2013 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3605843 http://www.ncbi.nlm.nih.gov/pubmed/23532172 https://doi.org/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_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3605843 http://www.ncbi.nlm.nih.gov/pubmed/23532172 http://dx.doi.org/10.1002/ece3.481 |
op_rights |
© 2013 Published by Blackwell Publishing Ltd. http://creativecommons.org/licenses/by/2.5/ Re-use of this article is permitted in accordance with the Creative Commons Deed, Attribution 2.5, which does not permit commercial exploitation. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1002/ece3.481 |
container_title |
Ecology and Evolution |
container_volume |
3 |
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3 |
container_start_page |
523 |
op_container_end_page |
535 |
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1766341856062341120 |