A hump-shaped relationship between migration distance and adult pink salmon morphology suggests interactive effects of migration costs and bear predation
We examined the relationship between environmental factors of a spawning habitat and body shape at maturity in 16 pink salmon (Oncorhynchus gorbuscha) populations. The divergence vector (indicator of body depth and head size development) in both sexes was significantly correlated with distance from...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
2016
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Online Access: | http://dx.doi.org/10.1139/cjfas-2015-0176 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2015-0176 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2015-0176 |
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crcansciencepubl:10.1139/cjfas-2015-0176 2024-06-23T07:55:56+00:00 A hump-shaped relationship between migration distance and adult pink salmon morphology suggests interactive effects of migration costs and bear predation Sahashi, Genki Yoshiyama, Taku Taylor, Eric 2016 http://dx.doi.org/10.1139/cjfas-2015-0176 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2015-0176 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2015-0176 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 73, issue 3, page 427-435 ISSN 0706-652X 1205-7533 journal-article 2016 crcansciencepubl https://doi.org/10.1139/cjfas-2015-0176 2024-06-13T04:10:51Z We examined the relationship between environmental factors of a spawning habitat and body shape at maturity in 16 pink salmon (Oncorhynchus gorbuscha) populations. The divergence vector (indicator of body depth and head size development) in both sexes was significantly correlated with distance from the sea and was described by a hump-shaped relationship. An exaggerated body shape was most developed at mid-distance from the sea and less developed both near and far from the sea. The observed frequency of bears decreased significantly with distance from the sea, implying that bear predation on salmon is most intense near the sea. Therefore, our results imply that shape-selective predation by bears affects the shape of pink salmon in rivers where the spawning habitat is near the sea and that migration costs inhibit development of an exaggerated body depth and head size in salmon in rivers where the spawning habitat is far from the sea. Article in Journal/Newspaper Oncorhynchus gorbuscha Pink salmon Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 73 3 427 435 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
We examined the relationship between environmental factors of a spawning habitat and body shape at maturity in 16 pink salmon (Oncorhynchus gorbuscha) populations. The divergence vector (indicator of body depth and head size development) in both sexes was significantly correlated with distance from the sea and was described by a hump-shaped relationship. An exaggerated body shape was most developed at mid-distance from the sea and less developed both near and far from the sea. The observed frequency of bears decreased significantly with distance from the sea, implying that bear predation on salmon is most intense near the sea. Therefore, our results imply that shape-selective predation by bears affects the shape of pink salmon in rivers where the spawning habitat is near the sea and that migration costs inhibit development of an exaggerated body depth and head size in salmon in rivers where the spawning habitat is far from the sea. |
author2 |
Taylor, Eric |
format |
Article in Journal/Newspaper |
author |
Sahashi, Genki Yoshiyama, Taku |
spellingShingle |
Sahashi, Genki Yoshiyama, Taku A hump-shaped relationship between migration distance and adult pink salmon morphology suggests interactive effects of migration costs and bear predation |
author_facet |
Sahashi, Genki Yoshiyama, Taku |
author_sort |
Sahashi, Genki |
title |
A hump-shaped relationship between migration distance and adult pink salmon morphology suggests interactive effects of migration costs and bear predation |
title_short |
A hump-shaped relationship between migration distance and adult pink salmon morphology suggests interactive effects of migration costs and bear predation |
title_full |
A hump-shaped relationship between migration distance and adult pink salmon morphology suggests interactive effects of migration costs and bear predation |
title_fullStr |
A hump-shaped relationship between migration distance and adult pink salmon morphology suggests interactive effects of migration costs and bear predation |
title_full_unstemmed |
A hump-shaped relationship between migration distance and adult pink salmon morphology suggests interactive effects of migration costs and bear predation |
title_sort |
hump-shaped relationship between migration distance and adult pink salmon morphology suggests interactive effects of migration costs and bear predation |
publisher |
Canadian Science Publishing |
publishDate |
2016 |
url |
http://dx.doi.org/10.1139/cjfas-2015-0176 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2015-0176 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2015-0176 |
genre |
Oncorhynchus gorbuscha Pink salmon |
genre_facet |
Oncorhynchus gorbuscha Pink salmon |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 73, issue 3, page 427-435 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2015-0176 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
73 |
container_issue |
3 |
container_start_page |
427 |
op_container_end_page |
435 |
_version_ |
1802648743774781440 |