A test for plasticity in sperm motility activation

Phillip Byrne, Zara Anastas & Aimee Silla
Evolutionary theory predicts that selection will favour phenotypic plasticity in sperm traits that maximise fertilisation success in dynamic fertilisation environments. In species with external fertilisation, osmolality of the fertilisation medium is known to play a critical role in activating sperm motility, but evidence for osmotic-induced sperm plasticity is limited to euryhaline fish and marine invertebrates. Whether this capacity extends to freshwater taxa remains unknown. Here, we provide the first test for plasticity in sperm-motility activation...
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