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Fig. 5. Acclimation induces electrophysiological dimorphism in males of
Brachyhypopomus pinnicaudatus. (A) Normalized EOD recordings of a
male captured in July before (grey line) and after (black line) acclimation
(30 days at 28°C, constant photoperiod and water conductivity). (B)
Electrophysiological dimorphism of the male, measured by the duration of
P2/duration P1 (DP2/DP1) ratio, of males captured from the natural habitat in
August/September and October (grey bars) and males captured in
August/September and acclimated for 30 days at 28°C (black bar). The
DP2/DP1 ratio was significantly higher after acclimation than those obtained
in freshly captured fish (Mann–Whitney test, P<0.05).
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