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Means (±SE) of (a) numbers of aggressive interactions and (b) fight duration in seven populations of P. mexicana. From left to right: populations from nonsulphidic surface sites [Tampico, Tam (N = 12), and Río Oxolotán, Ox (N = 14)], the sulphidic creek in the Cueva del Azufre system [El Azufre, EA (N = 9)], three cave chambers of the sulphidic Cueva del Azufre [CA-II (N = 12), CA-V (N = 7), CA-X (N = 6)], and the H2S-free cave [Luna Azufre, LA (N = 10)].
