Is the heritability for courtship and mating speed in Drosophila (fruit fly) low?

Abstract excerpt

Empirical studies indicate that heritable variation for courtship behaviour in Drosophila is often not detectable, whereas mating speed has a low heritability. These patterns have been used to make inferences about the association between mating behaviours and fitness. However, mating behaviours have been scored as single events, which can lead to underestimates of heritability values relevant to the lifetime...

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