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Fig. 3. Annual cycle of physicochemical water parameters and electrical characteristics of Brachyhypopomus pinnicaudatus in the wild. (A) water conductivity, (B) sunlight, (C) water temperature, (D) male electric dimorphism (DP2/DP1), (E) EOD temperature sensitivity index (TS). In A and C, solid and open symbols represent values taken during 1999 and 2000, respectively.