Data from: Experimental evolution reveals that sperm competition intensity selects for longer, more costly sperm

Joanne L. Godwin, Ramakrishnan Vasudeva, Lukasz Michalczyk, Oliver Y. Martin, Alyson J. Lumley, Tracey Chapman & Matthew J. G. Gage
It is the differences between sperm and eggs that fundamentally underpin the differences between the sexes within reproduction. For males, it is theorized that widespread sperm competition leads to selection for investment in sperm numbers, achieved by minimizing sperm size within limited resources for spermatogenesis in the testis. Here, we empirically examine how sperm competition shapes sperm size, after more than 77 generations of experimental selection of replicate lines under either high or low sperm...
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