Fecundity and water flow influence the dynamics of Atlantic salmon
Populations are retained at reduced levels by resource competition and environmental stochasticity. In the Norwegian River Imsa, the relationship between fecundity of Atlantic salmon (Salmo salar) spawners and number of smolts per unit river area was investigated for cohorts spawned from 1976 to 201...
Published in: | Ecology of Freshwater Fish |
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Language: | English |
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Online Access: | http://hdl.handle.net/11250/2477962 https://doi.org/10.1111/eff.12294 |
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ftninstnf:oai:brage.nina.no:11250/2477962 2023-05-15T15:30:21+02:00 Fecundity and water flow influence the dynamics of Atlantic salmon Jonsson, Bror Jonsson, Nina 2016 application/pdf http://hdl.handle.net/11250/2477962 https://doi.org/10.1111/eff.12294 eng eng Norges forskningsråd: 225014 urn:issn:0906-6691 http://hdl.handle.net/11250/2477962 https://doi.org/10.1111/eff.12294 cristin:1369113 Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no CC-BY-NC-ND Ecology of Freshwater Fish Journal article Peer reviewed 2016 ftninstnf https://doi.org/10.1111/eff.12294 2021-12-23T07:17:06Z Populations are retained at reduced levels by resource competition and environmental stochasticity. In the Norwegian River Imsa, the relationship between fecundity of Atlantic salmon (Salmo salar) spawners and number of smolts per unit river area was investigated for cohorts spawned from 1976 to 2011. Annual number of smolts produced per unit area was best described by a multiplicative model and increased with the fecundity of the females as proxy for number of eggs deposited and the minimum water flow in August towards the end of the first growth season. Mean monthly water temperature, or water flow in any other month during the first year, had no significant effect on number of smolts produced. At sea, there was an almost linear relationship between number of emigrating smolts and returning adults, possibly because population abundance of Atlantic salmon is low relative to the carrying capacity in the ocean. Thus, both number of eggs spawned and minimum water flow in late summer influenced population abundance in the present river. density dependence, River Imsa, Salmo salar, sea survival, stock–recruitment acceptedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar Norwegian Institute for Nature Research: Brage NINA Ecology of Freshwater Fish 26 3 497 502 |
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Open Polar |
collection |
Norwegian Institute for Nature Research: Brage NINA |
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ftninstnf |
language |
English |
description |
Populations are retained at reduced levels by resource competition and environmental stochasticity. In the Norwegian River Imsa, the relationship between fecundity of Atlantic salmon (Salmo salar) spawners and number of smolts per unit river area was investigated for cohorts spawned from 1976 to 2011. Annual number of smolts produced per unit area was best described by a multiplicative model and increased with the fecundity of the females as proxy for number of eggs deposited and the minimum water flow in August towards the end of the first growth season. Mean monthly water temperature, or water flow in any other month during the first year, had no significant effect on number of smolts produced. At sea, there was an almost linear relationship between number of emigrating smolts and returning adults, possibly because population abundance of Atlantic salmon is low relative to the carrying capacity in the ocean. Thus, both number of eggs spawned and minimum water flow in late summer influenced population abundance in the present river. density dependence, River Imsa, Salmo salar, sea survival, stock–recruitment acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Jonsson, Bror Jonsson, Nina |
spellingShingle |
Jonsson, Bror Jonsson, Nina Fecundity and water flow influence the dynamics of Atlantic salmon |
author_facet |
Jonsson, Bror Jonsson, Nina |
author_sort |
Jonsson, Bror |
title |
Fecundity and water flow influence the dynamics of Atlantic salmon |
title_short |
Fecundity and water flow influence the dynamics of Atlantic salmon |
title_full |
Fecundity and water flow influence the dynamics of Atlantic salmon |
title_fullStr |
Fecundity and water flow influence the dynamics of Atlantic salmon |
title_full_unstemmed |
Fecundity and water flow influence the dynamics of Atlantic salmon |
title_sort |
fecundity and water flow influence the dynamics of atlantic salmon |
publishDate |
2016 |
url |
http://hdl.handle.net/11250/2477962 https://doi.org/10.1111/eff.12294 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Ecology of Freshwater Fish |
op_relation |
Norges forskningsråd: 225014 urn:issn:0906-6691 http://hdl.handle.net/11250/2477962 https://doi.org/10.1111/eff.12294 cristin:1369113 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1111/eff.12294 |
container_title |
Ecology of Freshwater Fish |
container_volume |
26 |
container_issue |
3 |
container_start_page |
497 |
op_container_end_page |
502 |
_version_ |
1766360803389210624 |