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Comparison of the frequency of occurrence of selected biophony sound categories among locations grouped into four ambient noise categories: 90–95 dB (N = 29), 96–100 dB (N = 17) 101–105 dB (N = 14) and >105 dB (N = 17). A Chi Square (Chisq) test in a one-way contingency table of frequencies tested for differences in the observed group frequency from the expected group frequency (P ≤ 0.05, ns = not significant). See S7 Table for details.
