Table 2.1. Values of the two response variables of dolphin acoustic behaviour collected by calibrated hydrophone (average clicks and whistles per minutes) by size of group, behavioural state and time of day during baseline and impact monitoring periods. (The numerical values highlighted in blue indicated that the values recorded in impact monitoring period have triggered the Action Level (20% higher or lower than the baseline period), while the ones highlighted in red indicated a triggering of Limit Level (40% higher or lower than the baseline period). Only the cells highlighted in yellow have found significant differences between the values recorded in impact and baseline monitoring periods, while no significant difference was found in other comparisons even though some have triggered the Action or Limit Level.)

		Average clicks per minute ( ± s.d.)	Average whistles per minute ( ± s.d.)
Group Size
1 dolphins	Baseline	62.19 ± 77.73 (n=21)	0.21 ± 1.49 (n=19)
1 dolphins	Impact	119.11 ± 201.67 (n=11)	0.13 ± 0.30 (n=11)
2-5 dolphins	Baseline	54.03 ± 179.32 (n=82)	0.56 ± 1.70 (n=126)
2-5 dolphins	Impact	54.17 ± 95.45 (n=46)	0.09 ± 0.20 (n=46)
6-9 dolphins	Baseline	118.00 ± 310.31 (n=23)	1.58 ± 4.63 (n=38)
6-9 dolphins	Impact	106.06 ± 199.58 (n=26)	0.97 ± 1.99 (n=26)
10+ dolphins	Baseline	289.33 ± 140.58 (n=20)	2.74 ± 1.99 (n=36)
10+ dolphins	Impact	n/a	n/a
Behavioural State
Feeding	Baseline	30.95 ± 69.90 (n=16)	0.62 ± 1.33 (n=29)
Feeding	Impact	19.30 ± 29.62 (n=11)	0.16 ± 0.26 (n=11)
Milling	Baseline	71.29 ± 205.44 (n=90)	0.66 ± 1.85 (n=139)
Milling	Impact	80.09 ± 136.86 (n=54)	0.18 ± 0.60 (n=54)
Socializing	Baseline	287.48 ± 326.22 (n=20)	3.78 ± 4.14 (n=26)
Socializing	Impact	213.12 ± 309.71 (n=7)	2.48 ± 3.16 (n=7)
Traveling	Baseline	13.16 ± 208.94 (n=11)	0.25 ± 1.48 (n=12)
Traveling	Impact	52.34 ± 32.53 (n=7)	0.17 ± 0.29 (n=7)
Resting	Baseline	0.10 ± 70.35 (n=2)	0.13 ± 1.43 (n=6)
Resting	Impact	n/a	n/a
Time of day
09:00-10:59	Baseline	38.14 ± 69.90 (n=15)	0.70 ± 1.33 (n=29)
09:00-10:59	Impact	74.39 ± 124.79 (n=31)	0.32 ± 0.75 (n=31)
11:00-12:59	Baseline	79.97 ± 144.51 (n=68)	0.68 ± 1.86 (n=94)
11:00-12:59	Impact	110.73 ± 218.62 (n=26)	0.66 ± 1.78 (n=26)
13:00-14:59	Baseline	159.41 ± 303.43 (n=44)	1.74 ± 3.80 (n=62)
13:00-14:59	Impact	43.35 ± 72.50 (n=17)	0.03 ± 0.08 (n=17)
15:00-16:59	Baseline	65.40 ± 140.58 (n=17)	1.16 ± 1.99 (n=36)
15:00-16:59	Impact	49.90 ± 69.04 (n=12)	0.42 ± 1.20 (n=12)