Intrapopulation Variation in the Breeding of Male Pink Salmon ( Oncorhynchus gorbuscha) from a Lake Superior Tributary
Studies of breeding pink salmon (Oncorhynchus gorbuscha) from the Carp River, eastern Lake Superior, indicate that males seek fertilizations using two behavioural tactics. In 1985, a large run resulted in high breeding ground densities. During this run, males that resembled females were seen seeking...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1990
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Online Access: | http://dx.doi.org/10.1139/f90-019 http://www.nrcresearchpress.com/doi/pdf/10.1139/f90-019 |
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crcansciencepubl:10.1139/f90-019 2024-10-06T13:51:55+00:00 Intrapopulation Variation in the Breeding of Male Pink Salmon ( Oncorhynchus gorbuscha) from a Lake Superior Tributary Noltie, Douglas B. 1990 http://dx.doi.org/10.1139/f90-019 http://www.nrcresearchpress.com/doi/pdf/10.1139/f90-019 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 47, issue 1, page 174-179 ISSN 0706-652X 1205-7533 journal-article 1990 crcansciencepubl https://doi.org/10.1139/f90-019 2024-09-12T04:13:25Z Studies of breeding pink salmon (Oncorhynchus gorbuscha) from the Carp River, eastern Lake Superior, indicate that males seek fertilizations using two behavioural tactics. In 1985, a large run resulted in high breeding ground densities. During this run, males that resembled females were seen seeking fertilizations by sneaking rather than by competing for proximity to females. Morphological studies in 1985 confirmed the presence of males resembling females, their secondary sexual characters (hump height) being relatively less developed than in typical males. Although in poorer condition, such female-like males were reproductively mature, had returned to spawn at ages typical for this population, and had committed biomass to gonad no differently than had typical males. Furthermore, their spawning performance did not differ from typical males, as assessed both by the amount of gonad they retained unspawned at death and by their spawning ground life expectancies. In contrast, males attempting to sneak fertilizations were not observed during the small 1984 run when densities were low and males were generally in better condition than in 1985. Together, these results indicate that male pink salmon exhibit alternative breeding tactics. However, the demonstration of these tactics appears linked more to proximate factors (density and condition) than to divergent life history strategies as in other salmonid species. Article in Journal/Newspaper Oncorhynchus gorbuscha Pink salmon Canadian Science Publishing Carp River ENVELOPE(-105.735,-105.735,59.267,59.267) Canadian Journal of Fisheries and Aquatic Sciences 47 1 174 179 |
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Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Studies of breeding pink salmon (Oncorhynchus gorbuscha) from the Carp River, eastern Lake Superior, indicate that males seek fertilizations using two behavioural tactics. In 1985, a large run resulted in high breeding ground densities. During this run, males that resembled females were seen seeking fertilizations by sneaking rather than by competing for proximity to females. Morphological studies in 1985 confirmed the presence of males resembling females, their secondary sexual characters (hump height) being relatively less developed than in typical males. Although in poorer condition, such female-like males were reproductively mature, had returned to spawn at ages typical for this population, and had committed biomass to gonad no differently than had typical males. Furthermore, their spawning performance did not differ from typical males, as assessed both by the amount of gonad they retained unspawned at death and by their spawning ground life expectancies. In contrast, males attempting to sneak fertilizations were not observed during the small 1984 run when densities were low and males were generally in better condition than in 1985. Together, these results indicate that male pink salmon exhibit alternative breeding tactics. However, the demonstration of these tactics appears linked more to proximate factors (density and condition) than to divergent life history strategies as in other salmonid species. |
format |
Article in Journal/Newspaper |
author |
Noltie, Douglas B. |
spellingShingle |
Noltie, Douglas B. Intrapopulation Variation in the Breeding of Male Pink Salmon ( Oncorhynchus gorbuscha) from a Lake Superior Tributary |
author_facet |
Noltie, Douglas B. |
author_sort |
Noltie, Douglas B. |
title |
Intrapopulation Variation in the Breeding of Male Pink Salmon ( Oncorhynchus gorbuscha) from a Lake Superior Tributary |
title_short |
Intrapopulation Variation in the Breeding of Male Pink Salmon ( Oncorhynchus gorbuscha) from a Lake Superior Tributary |
title_full |
Intrapopulation Variation in the Breeding of Male Pink Salmon ( Oncorhynchus gorbuscha) from a Lake Superior Tributary |
title_fullStr |
Intrapopulation Variation in the Breeding of Male Pink Salmon ( Oncorhynchus gorbuscha) from a Lake Superior Tributary |
title_full_unstemmed |
Intrapopulation Variation in the Breeding of Male Pink Salmon ( Oncorhynchus gorbuscha) from a Lake Superior Tributary |
title_sort |
intrapopulation variation in the breeding of male pink salmon ( oncorhynchus gorbuscha) from a lake superior tributary |
publisher |
Canadian Science Publishing |
publishDate |
1990 |
url |
http://dx.doi.org/10.1139/f90-019 http://www.nrcresearchpress.com/doi/pdf/10.1139/f90-019 |
long_lat |
ENVELOPE(-105.735,-105.735,59.267,59.267) |
geographic |
Carp River |
geographic_facet |
Carp River |
genre |
Oncorhynchus gorbuscha Pink salmon |
genre_facet |
Oncorhynchus gorbuscha Pink salmon |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 47, issue 1, page 174-179 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f90-019 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
47 |
container_issue |
1 |
container_start_page |
174 |
op_container_end_page |
179 |
_version_ |
1812180234972168192 |