Reproductive success and mortality of male and female Daphnia at different sex ratios

This dataset contains data from Daphnia sexual reproduction experiments described in the paper: “Galimov YR, Haag CR, Tukhbatullin AR, Tchabovsky AV 2021. Sex ratio effects on reproductive success of male and female Daphnia. Journal of Evolutionary Ecology ”. 

We compared reproductive success of male and female Daphnia in experimental populations with sex ratios varying from one male per 81 females to one male per one female. In males, reproductive success strongly and monotonically decreased with decreasing number of females per male. In females, in contrast, mating success and reproductive success were reduced only at the most female-biased sex ratio (1:81), when many females remained unmated and unfertilized, and then again at equal sex ratios, probably due to negative effects of high density or stress induced by numerous males. Our results suggest that mating competition and the opportunity for sexual selection may exist not only in males but, at least periodically, also in femal...