Aussie scientist has bird homosexuality theory
A University of Newcastle biologist has published a theory explaining the frequency of homosexual behaviour in different bird species.
In earlier research Dr Geoff MacFarlane found that male-to-male sexual pairings were more common in bird species where males played less of a role raising offspring, and mated with multiple partners. Female-to-female pairings were more common in species that paired monogamously.
In a new paper published in the journal Animal Behaviour, MacFarlane argues that homosexual behaviour is not necessarily a disadvantage to birds in reproducing.
“In evolutionary literature, homosexual behaviour has always been seen as a cost to reproductive success based on the assumption that if you’re engaging in homosexual behaviour it’s going to reduce your chances of reproducing,” MacFarlane told Sydney Star Observer.
“We’re arguing that that’s not always the case. Birds in species where their parental care load is lower are going to spend more time looking for other reproductive opportunities.
“So where there are lots of reproductive opportunities, homosexual behaviour can occur as well without really influencing reproductive success. Rather than it being an impact on reproduction, it can exist quite happily with it.”
