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Sex and dormancy are intertwined in organisms that engage in asexual and sexual reproduction. The transition between asexual and sexual reproduction typically results in a dormant stage that provides a mechanism for persisting under harsh environmental conditions. For example, many zooplankton engage in sexual reproduction when environmental conditions deteriorate and produce resting eggs that remain viable for decades. It has long been assumed that observed variation in the timing and magnitude of investment into a dormant stage among populations or species reflects local environmental conditions. Yet, the importance of dormancy for the persistence of a given population can differ dramatically among habitats (i.e., permanent vs. seasonal ponds). As a result, environmental conditions may exert selection on the propensity for zooplankton to engage in sexual reproduction and enter dormancy in natural populations. Here, I highlight a growing body of research illustrating an important link between environmental conditions and divergent reproductive strategies in zooplankton. I specifically: (1) review the environmental cues that initiate a transition between asexual and sexual reproduction in zooplankton and (2) describe recent work demonstrating an evolutionary consequence of ecological selective pressures, such as predation and habitat predictability, on variation in the extent to which organisms engage in sex and enter dormancy. Such results have implications for the genetics and ecology of these organisms.

The Link Between Environmental Variation and Evolutionary Shifts in Dormancy in Zooplankton