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More often, however, males are not cooperating, but are in direct competition with each other over mating opportunities Andersson This has made us experts in the fields of masculinity, violence prevention, norm criticism, gender equality and fatherhood. Sätt ditt betyg ». Kin selection has been widely demonstrated in contexts such as predator evasion Shermancolony defence and propagation in eusocial insects Queller and Strassmanparental care Shieldsand selective cannibalism Walls and Roudebush The study was conducted according to the ethical requirements in Sweden Linköping Ethical committee, ethical permit no. First, linear declines in sperm production were recovered across the population. Kin selection can take place when males cooperate to enhance the reproductive success of relatives.

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Visual, but not vocal, contact with neighbouring birds was prevented.

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Scent of the enemy: Read more here about the different projects we run, both in Sweden and in other countries. Female feral fowl eject sperm of subdominant males. Old males, with lower reproductive potential, may therefore have different costs and benefits of competing with related or unrelated males, compared to younger males. Email alerts New issue alert. Relatedness and age reduce aggressive male interactions over mating in male domestic fowl. The project provides guys with a safe, supportive space to talk about their feelings and thoughts.

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