Table 2. Whistle parameters comparison between long-beaked common dolphin from the Gulf of California and from the Eastern Pacific Ocean.

Whistle parameter	Present study (n = 270)				Oswald et al. (2007) (n = 174)
	Min	Max	Mean ± SD	CV	Mean ± SD
Duration (s)*	0.05	2.17	0.44 ± 0.31	70.45%	0.62 ± 0.34
Maximum frequency (kHz)*	3.52	26.12	14.13 ± 3.71	26.26%	16.21 ± 4.94
Minimum frequency (kHz)	2.62	18.47	8.44 ± 2.58	30.57%	8.48 ± 2.70
Frequency range (kHz)	0.43	19.93	5.69 ± 3.40	59.75%	–
Starting frequency (kHz)	2.62	26.12	10.81 ± 4.25	39.32%	10.87 ± 4.89
Ending frequency (kHz)*	3.28	21.58	12.50 ± 3.78	30.24%	14.46 ± 5.12
Peak frequency (kHz)	3.00	20.55	10.46 ± 2.62	25.05%	–
No. of inflection points*	0.00	8.00	0.92 ± 0.99	107.61%	1.59 ± 3.29
No. of steps	0.00	4.00	0.40 ± 0.68	170.00%	–

Notes.

^*Significantly different parameters between the two long-beaked common dolphin populations (One-sample Wilcoxon test, p <0.001).