Predation risk breaks size-dependent dominance in juvenile coho salmon ( Oncorhynchus kisutch ) and provides growth opportunities for risk-prone individuals
Groups of coho salmon (Oncorhynchus kisutch) fry in stream tanks formed size-determined dominance hierarchies, which were upheld through aggressive interactions and led to smaller fish occupying inferior feeding positions. Under simulated predation risk, the frequency of agonistic interactions was r...
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1999
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Online Access: | http://dx.doi.org/10.1139/f99-064 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-064 |
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crcansciencepubl:10.1139/f99-064 2023-12-17T10:27:25+01:00 Predation risk breaks size-dependent dominance in juvenile coho salmon ( Oncorhynchus kisutch ) and provides growth opportunities for risk-prone individuals Reinhardt, Ulrich G 1999 http://dx.doi.org/10.1139/f99-064 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-064 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 56, issue 7, page 1206-1212 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1999 crcansciencepubl https://doi.org/10.1139/f99-064 2023-11-19T13:38:35Z Groups of coho salmon (Oncorhynchus kisutch) fry in stream tanks formed size-determined dominance hierarchies, which were upheld through aggressive interactions and led to smaller fish occupying inferior feeding positions. Under simulated predation risk, the frequency of agonistic interactions was reduced, but more intensive aggressive behaviours were performed. This allowed small fish to gain access to better feeding positions. The effect of the predation threat on coho behaviour seemed to extend across a riffle into a second pool that served as a refuge. Smaller fry that chose to be in the exposed pool had greater growth rates than those that mainly occupied the refuge, while large fry that exposed themselves to predation did not grow better than their risk-avoiding counterparts. Differences in risk taking and growth among small coho fry in this experiment may support reports for Atlantic salmon (Salmo salar) of a split into different life history trajectories. The observations suggest that the presence of predators creates opportunities for the expression of alternative behavioural strategies that are absent under size-dependent dominance hierarchies. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing (via Crossref) Canadian Journal of Fisheries and Aquatic Sciences 56 7 1206 1212 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Reinhardt, Ulrich G Predation risk breaks size-dependent dominance in juvenile coho salmon ( Oncorhynchus kisutch ) and provides growth opportunities for risk-prone individuals |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Groups of coho salmon (Oncorhynchus kisutch) fry in stream tanks formed size-determined dominance hierarchies, which were upheld through aggressive interactions and led to smaller fish occupying inferior feeding positions. Under simulated predation risk, the frequency of agonistic interactions was reduced, but more intensive aggressive behaviours were performed. This allowed small fish to gain access to better feeding positions. The effect of the predation threat on coho behaviour seemed to extend across a riffle into a second pool that served as a refuge. Smaller fry that chose to be in the exposed pool had greater growth rates than those that mainly occupied the refuge, while large fry that exposed themselves to predation did not grow better than their risk-avoiding counterparts. Differences in risk taking and growth among small coho fry in this experiment may support reports for Atlantic salmon (Salmo salar) of a split into different life history trajectories. The observations suggest that the presence of predators creates opportunities for the expression of alternative behavioural strategies that are absent under size-dependent dominance hierarchies. |
format |
Article in Journal/Newspaper |
author |
Reinhardt, Ulrich G |
author_facet |
Reinhardt, Ulrich G |
author_sort |
Reinhardt, Ulrich G |
title |
Predation risk breaks size-dependent dominance in juvenile coho salmon ( Oncorhynchus kisutch ) and provides growth opportunities for risk-prone individuals |
title_short |
Predation risk breaks size-dependent dominance in juvenile coho salmon ( Oncorhynchus kisutch ) and provides growth opportunities for risk-prone individuals |
title_full |
Predation risk breaks size-dependent dominance in juvenile coho salmon ( Oncorhynchus kisutch ) and provides growth opportunities for risk-prone individuals |
title_fullStr |
Predation risk breaks size-dependent dominance in juvenile coho salmon ( Oncorhynchus kisutch ) and provides growth opportunities for risk-prone individuals |
title_full_unstemmed |
Predation risk breaks size-dependent dominance in juvenile coho salmon ( Oncorhynchus kisutch ) and provides growth opportunities for risk-prone individuals |
title_sort |
predation risk breaks size-dependent dominance in juvenile coho salmon ( oncorhynchus kisutch ) and provides growth opportunities for risk-prone individuals |
publisher |
Canadian Science Publishing |
publishDate |
1999 |
url |
http://dx.doi.org/10.1139/f99-064 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-064 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 56, issue 7, page 1206-1212 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f99-064 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
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56 |
container_issue |
7 |
container_start_page |
1206 |
op_container_end_page |
1212 |
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1785579284979515392 |