Fig. 8. Mean (± S.E.M.) hearing thresholds (dark bars) and mean sound pressure levels (SPLs; RMS fast, calculated to a distance of 3 cm from the measuring hydrophone; light bars) of the sounds produced by the different species in dB re 1 µPa. The line bars within the mean SPLs indicate the range measured from minimum to maximum SPLs. SPL values of sounds were measured during previous studies (Ladich, 1998; Ladich, 1999; Wysocki and Ladich, 2002). Bm, Botia modesta (all sounds); Lg, Lepomis gibbosus (natural sounds); Pc, Platydoras costatus; Pp strid, Pimelodus pictus stridulation; Pp drum, Pimelodus pictus drumming sounds; Tv, Trichopsis vittata.

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