Strong sexual selection despite spatial constraints on extra-pair paternity

Emily Cramer, Emma Greig & Sara Kaiser
Extra-pair paternity should contribute to sexual selection by increasing the number of potential mates available to each individual. Potential copulation partners are, however, limited by their proximity. Spatial constraints may therefore reduce the impact of extra-pair paternity on sexual selection. We tested the effect of spatial constraints on sexual selection by simulating extra-pair copulations for 15 species of socially monogamous songbirds with varying rates of extra-pair paternity. We compared four metrics of sexual selection between...
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