Data from: Male butterflies use an anti-aphrodisiac pheromone to tailor ejaculates

Helena Larsdotter-Mellström, Kerstin Eriksson, Niklas Janz, Sören Nylin & Mikael A. Carlsson
1. When females mate with multiple partners, the risk of sperm competition depends on female mating history. To maximize fitness, males should adjust their mating investment according to this risk. In polyandrous butterflies males transfer a large, nutritious ejaculate at mating. Larger ejaculates delay female remating and confer an advantage in sperm competition. 2. We test if male ejaculate size in the butterfly Pieris napi (Lepidoptera) varies with female mating history and thus sperm competition,...
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