Hermaphrodite dating group
These findings challenge the prevailing notion of male driven mating rates in simultaneous hermaphrodites and call for complementary investigations of mating rate effects on fitness through the male sexual function.There is increasing awareness that ecological processes such as changes in population demography can substantially affect the evolution of mating systems (reviewed in ).Because our predictions match those of the theoretical work by Härdling and Kaitala  developed for separate sex species (see above), we discuss our findings accordingly.
A different scenario appears plausible in the hermaphroditic opisthobranch Chelidonura sandrana.
Second, individual costs associated with matings in the female function can be compensated by a gain in paternity , rendering hermaphrodites likely to accept even costly female matings.
If mating rate is indeed controlled by the male function, one would expect that mating rate increases at higher population densities because higher densities should increase mate encounter rates and thus mating opportunities.
Experimental work showed that maternal per-egg investment depends on the number of different mating partners , being maximized at an intermediate mating rate of 2-3 matings per day .
At this mating rate, fecundity costs due to multiple matings appear to be offset through reduced embryo mortality [23, 24].