Data from: Ovarian fluid allows directional cryptic female choice despite external fertilization

Susan E. Marsh-Rollo, Suzanne H. Alonzo & Kelly A. Stiver
In species with internal fertilization, females can favour certain males over others, not only before mating but also within the female’s reproductive tract after mating. Here, we ask whether such directional post-mating (that is, cryptic) female mate choice can also occur in species with external fertilization. Using an in vitro sperm competition experiment, we demonstrate that female ovarian fluid (ovarian fluid) changes the outcome of sperm competition by decreasing the importance of sperm number thereby...
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