In matings with virgin females, only sperm store fluid is displaced at the start of sperm transfer, but if there is swift random mixing of seminal and sperm store fluid the fluid displcaed will contain sperm at the same average density as that in the sperm stores (random displacement). In mating of the same female by two or more males, the sperm density of the last male to mate is assumed to be independent of the presence of previous sperm; the proportion of eggs fertilized by the last male thus equals the density of the last male's sperm divided by the current total density of sperm in the sperm stores. Predictions for this model are supported using data from the dung fly Scatophaga stercoraria. -from Authors
CITATION STYLE
Parker, G. A., & Simmons, L. W. (1992). A model of constant random sperm displacement during mating: evidence from Scatophaga. Proceedings - Royal Society of London, B, 246(1316), 107–115.
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