Abstract
My review1 focused on alternative explanations for the adaptive significance of temperature sex determination (TSD), whereas Girondot and Pieau2 question the underlying premise that any such advantages accrue. Instead, they favour the ‘quasi-neutral’ theory, whereby TSD persists because it confers only trivial disadvantage relative to genetic sex determination (GSD). Certainly, TSD might involve disadvantages as well as advantages. For example, climatically driven temporal fluctuations in sex ratio might favour either GSD (because of the ‘balance’ argument3, as Girondot and Pieau suggest) or TSD (because of concurrent temporal fluctuations in recruitment4).
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