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Sex ratio variation shapes the ecological effects of a globally introduced freshwater fish [Royal Society Open Science]

Keywords : sexual dimorphism, trophic cascade, mosquitofish, Gambusia, freshwater ecology

par Frédéric Magné - publié le

Sex ratio and sexual dimorphism have long been of interest in population and evolutionary ecology, but consequences for communities and ecosystems remain untested. Sex ratio could influence ecological conditions whenever sexual dimorphism is associated with ecological dimorphism in species with strong ecological interactions. We tested for ecological implications of sex ratio variation in the sexually dimorphic western mosquitofish, Gambusia affinis. This species causes strong pelagic trophic cascades and exhibits substantial variation in adult sex ratios.(...)

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