Divergent Evolution of Male Aggressive Behaviour: Another Reproductive Isolation Barrier in Extremophile Poeciliid Fishes?
Figure 3
Means (±SE) of (a) numbers of aggressive behaviours shown by males during dyadic fights and (b) duration of fights in wild-caught males from two P. mexicana populations [the sulphide-free Río Ixtapangajoya, IX () and cave chamber II of the sulphidic Cueva del Azufre, CA-II ()], as well as the sulphur-endemic P. sulphuraria (PS) found at the Baños del Azufre ().
