Longitudinal gradients in threshold sizes for alternative male life history tactics in a population of Atlantic salmon ( Salmo salar )
Atlantic salmon (Salmo salar) males may mature early in life in freshwater, rather than maturing after a migration to sea, if their size is above a threshold value. We analyzed the spatiotemporal variation in size and incidence of the early maturity tactic among males over an 8-year period in six su...
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crcansciencepubl:10.1139/f06-103 2024-04-28T08:13:27+00:00 Longitudinal gradients in threshold sizes for alternative male life history tactics in a population of Atlantic salmon ( Salmo salar ) Aubin-Horth, Nadia Bourque, Jean-Francois Daigle, Gaetan Hedger, Richard Dodson, Julian J 2006 http://dx.doi.org/10.1139/f06-103 http://www.nrcresearchpress.com/doi/pdf/10.1139/f06-103 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 63, issue 9, page 2067-2075 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2006 crcansciencepubl https://doi.org/10.1139/f06-103 2024-04-09T06:56:24Z Atlantic salmon (Salmo salar) males may mature early in life in freshwater, rather than maturing after a migration to sea, if their size is above a threshold value. We analyzed the spatiotemporal variation in size and incidence of the early maturity tactic among males over an 8-year period in six subpopulations on two branches of a river and collected environmental data on each site and across the river scape. A positive longitudinal trend in the frequency of early maturing males that was stable over the 8-year period occurred from the mouth to the head of the river. Threshold sizes for early maturation varied among subpopulations; size thresholds for male parr to mature were higher in downstream habitats and lowest upstream. This pattern was consistent in both river branches over the 8-year period and was not related to either the density of parr or site-specific abiotic habitat characteristics. However, the cumulative incidence of habitat features that could impede migration of large individuals increased with increasing upstream distance. Migration costs may contribute to the observed variation in threshold sizes. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 63 9 2067 2075 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
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Aquatic Science Ecology, Evolution, Behavior and Systematics Aubin-Horth, Nadia Bourque, Jean-Francois Daigle, Gaetan Hedger, Richard Dodson, Julian J Longitudinal gradients in threshold sizes for alternative male life history tactics in a population of Atlantic salmon ( Salmo salar ) |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Atlantic salmon (Salmo salar) males may mature early in life in freshwater, rather than maturing after a migration to sea, if their size is above a threshold value. We analyzed the spatiotemporal variation in size and incidence of the early maturity tactic among males over an 8-year period in six subpopulations on two branches of a river and collected environmental data on each site and across the river scape. A positive longitudinal trend in the frequency of early maturing males that was stable over the 8-year period occurred from the mouth to the head of the river. Threshold sizes for early maturation varied among subpopulations; size thresholds for male parr to mature were higher in downstream habitats and lowest upstream. This pattern was consistent in both river branches over the 8-year period and was not related to either the density of parr or site-specific abiotic habitat characteristics. However, the cumulative incidence of habitat features that could impede migration of large individuals increased with increasing upstream distance. Migration costs may contribute to the observed variation in threshold sizes. |
format |
Article in Journal/Newspaper |
author |
Aubin-Horth, Nadia Bourque, Jean-Francois Daigle, Gaetan Hedger, Richard Dodson, Julian J |
author_facet |
Aubin-Horth, Nadia Bourque, Jean-Francois Daigle, Gaetan Hedger, Richard Dodson, Julian J |
author_sort |
Aubin-Horth, Nadia |
title |
Longitudinal gradients in threshold sizes for alternative male life history tactics in a population of Atlantic salmon ( Salmo salar ) |
title_short |
Longitudinal gradients in threshold sizes for alternative male life history tactics in a population of Atlantic salmon ( Salmo salar ) |
title_full |
Longitudinal gradients in threshold sizes for alternative male life history tactics in a population of Atlantic salmon ( Salmo salar ) |
title_fullStr |
Longitudinal gradients in threshold sizes for alternative male life history tactics in a population of Atlantic salmon ( Salmo salar ) |
title_full_unstemmed |
Longitudinal gradients in threshold sizes for alternative male life history tactics in a population of Atlantic salmon ( Salmo salar ) |
title_sort |
longitudinal gradients in threshold sizes for alternative male life history tactics in a population of atlantic salmon ( salmo salar ) |
publisher |
Canadian Science Publishing |
publishDate |
2006 |
url |
http://dx.doi.org/10.1139/f06-103 http://www.nrcresearchpress.com/doi/pdf/10.1139/f06-103 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 63, issue 9, page 2067-2075 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f06-103 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
63 |
container_issue |
9 |
container_start_page |
2067 |
op_container_end_page |
2075 |
_version_ |
1797579947437457408 |