Data from: Male offspring production by asexual Potamopyrgus antipodarum, a New Zealand snail

Maurine Neiman, Katelyn Larkin, Andrew R. Thompson & Peter Wilton
As only females contribute directly to population growth, sexual females investing equally in sons and daughters experience a two-fold cost relative to asexuals producing only daughters. Typically, researchers have focused on benefits of sex that can counter this ‘cost of males’ and thus explain its predominance. Here, we instead ask whether asexuals might also pay a cost of males by quantifying the rate of son production in 45 experimental populations (‘lineages’) founded by obligately asexual...
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