Figure 3 | Scientific Reports

Figure 3

From: Long-Term Monitoring of Dolphin Biosonar Activity in Deep Pelagic Waters of the Mediterranean Sea

Figure 3

Daily pattern. (a) Spectrogram (nfft = 2048; overlap = 50; Hann window) of dolphin vocalizations investigated: clicks and whistles. (b) Click probability of presence for the automatic analysis (in red) as a function of hour of day (GAM model, 2005: N = 3736, R2 = 0.215, Deviance explained = 19.7%, Hour: χ2 = 619.7, P < 0.001; 2006: N = 1758, R2 = 0.266, Deviance explained = 24.1%, Hour: χ2 = 349.3, P < 0.001). (c) Click probability of presence for the manual analysis (in blue) as a function of hour of day (GAM model, 2005: N = 3736, R2 = 0.297, Deviance explained = 23.2%, Hour: χ2 = 914.3, P < 0.001; 2006: N = 1758, R2 = 0.337, Deviance explained = 27.7%, Hour: χ2 = 459, P < 0.001). (c) Whistle probability of presence for the manual analysis (in grey) as a function of hour of day (GAM model, 2005: N = 3736, R2 = 0.0084, Deviance explained = 0.883%, Hour: χ2 = 35, P < 0.001; 2006: N = 1758, R2 = 0.0194, Deviance explained = 2.1%, Hour: χ2 = 37.53, P < 0.001). (b–d), (top) 2005; (bottom) 2006; (shaded areas) 95% confidence intervals.

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