Density, parasitism, and sexual reproduction are strongly correlated in lake Daphnia populations

Meghan A. Duffy, Camden D. Gowler, Mary A. Rogalski, Clara L. Shaw & Katherine K. Hunsberger
Many organisms can reproduce both asexually and sexually. For cyclical parthenogens, periods of asexual reproduction are punctuated by bouts of sexual reproduction, and the shift from asexual to sexual reproduction has large impacts on fitness and population dynamics. We studied populations of Daphnia dentifera to determine the amount of investment in sexual reproduction as well as the factors associated with variation in investment in sex. To do so, we tracked host density, infections by nine...
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