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Females choose sexier friends to avoid harassment
Date:12/6/2011

Scientists have observed a strategy for females to avoid unwanted male attention: choosing more attractive friends. Published today (7 December) in the journal Proceedings of the Royal Society B, the study is the first to show females spending time with those more sexually attractive than themselves to reduce harassment from males.

Carried out by the Universities of Exeter and Copenhagen, the study focuses on the Trinidadian guppy, a species of small freshwater fish. It shows that the females choose companions that are relatively more attractive than themselves and in this way reduce harassment from males. The research shows that the tactic is successful and by ensuring they are less attractive than other group members, the fish experience less harassment and fewer mating attempts from males.

Male guppies are well known for frequent and sometimes constant harassment of females. This puts a significant burden on females, sometimes preventing them finding food and escaping from predators.

Females are 'receptive' for a few days in each month. During this time they emit a sexual pheromone that attracts males and allow males to glide into a position that facilitates mating.

The researchers used guppies descended from those living in the Aripo River in Trinidad. They identified which females were currently receptive to male sexual attention and which were not. They then monitored the amount of time both receptive and non-receptive females chose to spend with either receptive or non-receptive females.

They found that non-receptive females spent significantly more time with receptive, and therefore more sexually attractive, females and that, by doing so, they received far less attention from males. In fact, they even chose water in which receptive females had recently swum over water that had housed other non-receptive fish. This shows they picked up on chemical cues emitted by receptive females and found this to cre
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Contact: Sarah Hoyle
s.hoyle@exeter.ac.uk
44-013-927-22062
University of Exeter
Source:Eurekalert

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