Breeding games and dimorphism in male salmon

Publication year: 2009
Source: Animal Behaviour, Volume 77, Issue 6, June 2009, Pages 1409-1413</br>
Yumi, Tanaka , Taro, Hayashi , Donald G., Miller III , Kei-ichi, Tainaka , Jin, Yoshimura</br>
In certain species of salmon, male phenotypes occur in two distinct morphs: the large ‘hooknose’ or the small ‘jack’. Hooknoses fight each other for access to females, while jacks occupy refuges near spawning beds to sneak fertilizations. Jacks also fight each other over opportunities for sneaking without immediate gains. To explore whether the jack behavioural strategy is equally adaptive to that of the hooknose, we built a game-theoretic model similar to the classic hawk–dove game, with and without conditions of density dependence. Our model demonstrates that fitness of the jack strategy increases with the frequency of the hooknose strategy, because...</br>

11th August 2010 12:14

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