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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 (N = 9) and cave chamber II of the sulphidic Cueva del Azufre, CA-II (N = 7)], as well as the sulphur-endemic P. sulphuraria (PS) found at the Baños del Azufre (N = 7).
