Data from: Postcopulatory sexual selection is associated with accelerated evolution of sperm morphology

Melissah Rowe, Tomas Albrecht, Emily Rebecca Alison Cramer, Arild Johnsen, Terje Laskemoen, Jason T. Weir & Jan T. Lifjeld
Rapid diversification of sexual traits is frequently attributed to sexual selection, though explicit tests of this hypothesis remain limited. Spermatozoa exhibit remarkable variability in size and shape, and studies report a correlation between sperm morphology (sperm length and shape) and sperm competition risk or female reproductive tract morphology. However, whether postcopulatory processes (e.g. sperm competition and cryptic female choice) influence the speed of evolutionary diversification in sperm form is unknown. Using passerine birds, we quantified...
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