Historical abundance and spatial distributions of spawners determine juvenile habitat accessibility in salmon: implications for population dynamics and management targets
Spatial distribution of spawning may have important ramifications for population dynamics in species where early life stages suffer from low mobility and high density-dependent mortality. Here, we use time series of spatial spawning distribution in Atlantic salmon (Salmo salar) to test for density-d...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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NRC Research Press (Canadian Science Publishing)
2013
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Online Access: | http://hdl.handle.net/11250/2468830 https://doi.org/10.1139/cjfas-2012-0455 |
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2468830 2023-05-15T15:32:29+02:00 Historical abundance and spatial distributions of spawners determine juvenile habitat accessibility in salmon: implications for population dynamics and management targets Finstad, Anders Gravbrøt Sættem, Leif Magnus Einum, Sigurd 2013 http://hdl.handle.net/11250/2468830 https://doi.org/10.1139/cjfas-2012-0455 eng eng NRC Research Press (Canadian Science Publishing) Norges forskningsråd: 171635 Norges forskningsråd: 223257 Canadian Journal of Fisheries and Aquatic Sciences. 2013, 70 (9), 1339-1345. urn:issn:0706-652X http://hdl.handle.net/11250/2468830 https://doi.org/10.1139/cjfas-2012-0455 cristin:1058421 1339-1345 70 Canadian Journal of Fisheries and Aquatic Sciences 9 Journal article Peer reviewed 2013 ftntnutrondheimi https://doi.org/10.1139/cjfas-2012-0455 2019-09-17T06:53:16Z Spatial distribution of spawning may have important ramifications for population dynamics in species where early life stages suffer from low mobility and high density-dependent mortality. Here, we use time series of spatial spawning distribution in Atlantic salmon (Salmo salar) to test for density-dependent behavioural effects on the spatial utilization of spawning sites and resulting juvenile habitat availability. The probability of utilizing spawning sites in a given year increased both with increasing spawner abundance and proximity to sites used the previous year. The accessible area for juveniles increased asymptotically with both current and time-lagged spawner abundance. Several nonexclusive mechanisms may be responsible for the observed direct and lagged density dependence of spawner distributions, including social aggregation, asymmetric competition for space, local homing, and habitat modification by the previous year’s spawners. Time-lagged density-dependent spawner distributions can be predicted to reduce the realized population growth rate. If such effects are not accounted for, this may lead to a downward bias in estimates of spawning targets or other associated conservation or management measures derived from population abundance time series. acceptedVersion © NRC Research Press. This is the authors’ accepted and refereed manuscript to the article. Article in Journal/Newspaper Atlantic salmon Salmo salar NTNU Open Archive (Norwegian University of Science and Technology) Canadian Journal of Fisheries and Aquatic Sciences 70 9 1339 1345 |
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Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
description |
Spatial distribution of spawning may have important ramifications for population dynamics in species where early life stages suffer from low mobility and high density-dependent mortality. Here, we use time series of spatial spawning distribution in Atlantic salmon (Salmo salar) to test for density-dependent behavioural effects on the spatial utilization of spawning sites and resulting juvenile habitat availability. The probability of utilizing spawning sites in a given year increased both with increasing spawner abundance and proximity to sites used the previous year. The accessible area for juveniles increased asymptotically with both current and time-lagged spawner abundance. Several nonexclusive mechanisms may be responsible for the observed direct and lagged density dependence of spawner distributions, including social aggregation, asymmetric competition for space, local homing, and habitat modification by the previous year’s spawners. Time-lagged density-dependent spawner distributions can be predicted to reduce the realized population growth rate. If such effects are not accounted for, this may lead to a downward bias in estimates of spawning targets or other associated conservation or management measures derived from population abundance time series. acceptedVersion © NRC Research Press. This is the authors’ accepted and refereed manuscript to the article. |
format |
Article in Journal/Newspaper |
author |
Finstad, Anders Gravbrøt Sættem, Leif Magnus Einum, Sigurd |
spellingShingle |
Finstad, Anders Gravbrøt Sættem, Leif Magnus Einum, Sigurd Historical abundance and spatial distributions of spawners determine juvenile habitat accessibility in salmon: implications for population dynamics and management targets |
author_facet |
Finstad, Anders Gravbrøt Sættem, Leif Magnus Einum, Sigurd |
author_sort |
Finstad, Anders Gravbrøt |
title |
Historical abundance and spatial distributions of spawners determine juvenile habitat accessibility in salmon: implications for population dynamics and management targets |
title_short |
Historical abundance and spatial distributions of spawners determine juvenile habitat accessibility in salmon: implications for population dynamics and management targets |
title_full |
Historical abundance and spatial distributions of spawners determine juvenile habitat accessibility in salmon: implications for population dynamics and management targets |
title_fullStr |
Historical abundance and spatial distributions of spawners determine juvenile habitat accessibility in salmon: implications for population dynamics and management targets |
title_full_unstemmed |
Historical abundance and spatial distributions of spawners determine juvenile habitat accessibility in salmon: implications for population dynamics and management targets |
title_sort |
historical abundance and spatial distributions of spawners determine juvenile habitat accessibility in salmon: implications for population dynamics and management targets |
publisher |
NRC Research Press (Canadian Science Publishing) |
publishDate |
2013 |
url |
http://hdl.handle.net/11250/2468830 https://doi.org/10.1139/cjfas-2012-0455 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
1339-1345 70 Canadian Journal of Fisheries and Aquatic Sciences 9 |
op_relation |
Norges forskningsråd: 171635 Norges forskningsråd: 223257 Canadian Journal of Fisheries and Aquatic Sciences. 2013, 70 (9), 1339-1345. urn:issn:0706-652X http://hdl.handle.net/11250/2468830 https://doi.org/10.1139/cjfas-2012-0455 cristin:1058421 |
op_doi |
https://doi.org/10.1139/cjfas-2012-0455 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
70 |
container_issue |
9 |
container_start_page |
1339 |
op_container_end_page |
1345 |
_version_ |
1766362982155026432 |