Resource Partitioning between Two Piranhas (<i>Serrasalmus gibbus</i> and <i>Serrasalmus rhombeus</i>) in an Amazonian Reservoir.

rhombeus presented a clear preference for the nocturnal period ( Figure 4 ), peaking in the first half of the night, with highly significant differences among intervals ( χ 2 = 56.298; df = 7; p < 0.05) and between nocturnal and diurnal periods ( χ 2 = 22.601; df = 1; p < 0.05; Yates = 21.661 and p < 0.05), but there was no difference between seasons ( χ 2 = 0.981; df = 1; p ≥ 0.05). 3.1.

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