Our borderline significant heritability of plasticity suggests that there may be significant genetic variation in the trait, and hence selection would be able to act directly on response to rivals.
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The heritability of mating behaviour in a fly and its plasticity in response to the threat of sperm competition.
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The sentences
We also found evidence suggesting genetic variation in degree of plasticity in mating duration depending on exposure to rivals in one of the two populations, although this evidence was borderline non-significant and hence very weak.
We find no significant heritability of plasticity in mating duration in one population, but borderline significant heritability of plasticity in the second.