Data from: The contribution of post-copulatory mechanisms to incipient ecological speciation in sticklebacks

Joshka Kaufmann, Christophe Eizaguirre, Manfred Milinski & Tobias L. Lenz
Ecology can play a major role in species diversification. As individuals are adapting to contrasting habitats, reproductive barriers may evolve at multiple levels. While pre-mating barriers have been extensively studied, the evolution of post-mating reproductive isolation during early stages of ecological speciation remains poorly understood. In diverging three-spined stickleback ecotypes from two lakes and two rivers, we observed differences in sperm traits between lake and river males. Interestingly, these differences did not translate into ecotype-specific...
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