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Means (±SE) of (a) numbers of aggressive behaviours and (b) the duration of male fights in males from two extremophile populations in the Cueva del Azufre system, one from the sulphidic surface stream [El Azufre, EA (N = 21)] and one from chamber X of the sulphidic Cueva del Azufre [CA-X (N = 16)]. Prior to the tests, males were either fed on a normal diet (left bars) or starved for one week (s: right bars).
