Data from: Optimal sperm length for high siring success depends on forehead patch size in collared flycatchers

Murielle Ålund, Siri Persson Schmiterlöw, S. Eryn McFarlane & Anna Qvarnström
Dominance over rivals, sexual attractiveness and highly efficient ejaculates are three important contributors of male fertilization success but theories about how primary and secondary sexual characters may co-evolve largely remain to be tested. We investigated how variation in a sexual signal (forehead patch size) and in sperm morphology jointly affected siring success of 70 males in a natural population of collared flycatchers. We show that the optimal sperm length to attain high relative fertilization success...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
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