Patterns of Aggression and Operational Sex Ratio Within Alternative Male Phenotypes in Atlantic Salmon
Abstract The intensity of male–male aggression during mating is predicted to increase with the operational sex ratio (OSR) (the ratio of sexually active males to females). We observed aggressive behaviour in relation to OSR within alternative phenotypes (large anadromous males and small ‘sneaker’ ma...
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crwiley:10.1111/j.1439-0310.2009.01723.x 2024-06-02T08:03:33+00:00 Patterns of Aggression and Operational Sex Ratio Within Alternative Male Phenotypes in Atlantic Salmon Weir, Laura K. Grant, James W. A. Hutchings, Jeffrey A. 2010 http://dx.doi.org/10.1111/j.1439-0310.2009.01723.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1439-0310.2009.01723.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1439-0310.2009.01723.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ethology volume 116, issue 2, page 166-175 ISSN 0179-1613 1439-0310 journal-article 2010 crwiley https://doi.org/10.1111/j.1439-0310.2009.01723.x 2024-05-03T11:30:22Z Abstract The intensity of male–male aggression during mating is predicted to increase with the operational sex ratio (OSR) (the ratio of sexually active males to females). We observed aggressive behaviour in relation to OSR within alternative phenotypes (large anadromous males and small ‘sneaker’ mature male parr) of Atlantic salmon, Salmo salar , as they competed for access to anadromous females in large outdoor arenas immediately prior to spawning events as well as throughout the spawning season. Anadromous males were primarily aggressive outside of spawning events, and their aggression increased with OSR over a narrow range of 0.08–4. By contrast, mature male parr were aggressive just prior to spawning, with a decrease in aggression over a broad range of OSRs from 1 to 7.4. Similarly, literature data for three other salmonid species indicated a decrease in aggression with increasing OSRs over a range of 1–6.33. These observations suggest that there is considerable variability in competitive behaviour, even within alternative phenotypes. Because our data are derived from repeated observations on the same individuals of different genetic origin, further confirmation of these findings is desirable. Nevertheless, our study underscores the importance of measuring competitive behaviour and OSR at ecologically relevant spatial and temporal scales, both of which may differ between alternative maturation phenotypes. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Ethology 116 2 166 175 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The intensity of male–male aggression during mating is predicted to increase with the operational sex ratio (OSR) (the ratio of sexually active males to females). We observed aggressive behaviour in relation to OSR within alternative phenotypes (large anadromous males and small ‘sneaker’ mature male parr) of Atlantic salmon, Salmo salar , as they competed for access to anadromous females in large outdoor arenas immediately prior to spawning events as well as throughout the spawning season. Anadromous males were primarily aggressive outside of spawning events, and their aggression increased with OSR over a narrow range of 0.08–4. By contrast, mature male parr were aggressive just prior to spawning, with a decrease in aggression over a broad range of OSRs from 1 to 7.4. Similarly, literature data for three other salmonid species indicated a decrease in aggression with increasing OSRs over a range of 1–6.33. These observations suggest that there is considerable variability in competitive behaviour, even within alternative phenotypes. Because our data are derived from repeated observations on the same individuals of different genetic origin, further confirmation of these findings is desirable. Nevertheless, our study underscores the importance of measuring competitive behaviour and OSR at ecologically relevant spatial and temporal scales, both of which may differ between alternative maturation phenotypes. |
format |
Article in Journal/Newspaper |
author |
Weir, Laura K. Grant, James W. A. Hutchings, Jeffrey A. |
spellingShingle |
Weir, Laura K. Grant, James W. A. Hutchings, Jeffrey A. Patterns of Aggression and Operational Sex Ratio Within Alternative Male Phenotypes in Atlantic Salmon |
author_facet |
Weir, Laura K. Grant, James W. A. Hutchings, Jeffrey A. |
author_sort |
Weir, Laura K. |
title |
Patterns of Aggression and Operational Sex Ratio Within Alternative Male Phenotypes in Atlantic Salmon |
title_short |
Patterns of Aggression and Operational Sex Ratio Within Alternative Male Phenotypes in Atlantic Salmon |
title_full |
Patterns of Aggression and Operational Sex Ratio Within Alternative Male Phenotypes in Atlantic Salmon |
title_fullStr |
Patterns of Aggression and Operational Sex Ratio Within Alternative Male Phenotypes in Atlantic Salmon |
title_full_unstemmed |
Patterns of Aggression and Operational Sex Ratio Within Alternative Male Phenotypes in Atlantic Salmon |
title_sort |
patterns of aggression and operational sex ratio within alternative male phenotypes in atlantic salmon |
publisher |
Wiley |
publishDate |
2010 |
url |
http://dx.doi.org/10.1111/j.1439-0310.2009.01723.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1439-0310.2009.01723.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1439-0310.2009.01723.x |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Ethology volume 116, issue 2, page 166-175 ISSN 0179-1613 1439-0310 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1439-0310.2009.01723.x |
container_title |
Ethology |
container_volume |
116 |
container_issue |
2 |
container_start_page |
166 |
op_container_end_page |
175 |
_version_ |
1800748117860024320 |