Table 2.1. Values of all response variables in the baseline and construction phases, with the percentage change. Split by the presence and absence of vessels by time of day, size of group, and maximum number of vessels present. (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 (two-sample t-test with unequal variance, p<0.05) 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.)
|
|
Speed (km/hr) |
Reorientation rate
(degrees/surfacing) |
Linearity |
Inter-breath interval (sec) |
||||||||
|
|
Base |
Constr |
% Diff |
Base |
Constr |
% Diff |
Base |
Constr |
% Diff |
Base |
Constr |
% Diff |
|
Vessels absent |
3.60 |
3.40 |
5.6 |
50.3 |
56.7 |
12.8 |
0.618 |
0.291 |
52.9 |
51.2 |
51.2 |
0.0 |
|
Morning |
3.46 |
3.65 |
5.4 |
45.4 |
62.4 |
37.4 |
0.676 |
0.303 |
55.2 |
53.9 |
79.4 |
47.3 |
|
Afternoon |
3.80 |
3.15 |
17.2 |
57.2 |
51.0 |
10.9 |
0.536 |
0.280 |
47.8 |
47.3 |
23.0 |
51.4 |
|
Individual |
3.39 |
3.14 |
7.2 |
46.9 |
51.8 |
10.5 |
0.733 |
0.080 |
89.0 |
57.2 |
33.3 |
41.7 |
|
Group |
3.91 |
3.51 |
10.3 |
55.2 |
58.8 |
6.6 |
0.455 |
0.382 |
16.0 |
42.6 |
58.9 |
38.3 |
|
Vessels present |
3.77 |
3.27 |
13.4 |
50.5 |
56.5 |
12.0 |
0.577 |
0.481 |
16.6 |
43.3 |
49.8 |
14.8 |
|
Morning |
3.74 |
3.13 |
16.2 |
49.9 |
53.7 |
7.5 |
0.606 |
0.535 |
11.8 |
45.0 |
48.3 |
7.2 |
|
Afternoon |
3.93 |
3.67 |
6.7 |
52.7 |
65.1 |
23.5 |
0.454 |
0.320 |
29.7 |
36.2 |
54.1 |
49.6 |
|
Individual |
3.42 |
2.96 |
13.4 |
50.8 |
55.2 |
8.7 |
0.542 |
0.458 |
15.5 |
45.0 |
50.6 |
12.5 |
|
Group |
4.26 |
3.46 |
18.6 |
50.0 |
57.4 |
14.7 |
0.625 |
0.496 |
20.7 |
41.1 |
49.2 |
19.7 |
|
1 vessel |
3.91 |
3.13 |
20.0 |
48.8 |
56.3 |
15.4 |
0.572 |
0.429 |
24.9 |
36.9 |
48.7 |
32.0 |
|
2 vessels |
3.74 |
3.60 |
3.6 |
55.8 |
52.0 |
6.7 |
0.559 |
0.457 |
18.1 |
53.6 |
56.0 |
4.5 |
|
3 vessels |
4.26 |
3.27 |
23.2 |
45.8 |
69.2 |
50.9 |
0.689 |
0.518 |
24.8 |
62.5 |
44.0 |
29.6 |
Table 2.2. Proportion of time
spent in each behavioural state in the absence and presence of vessels within
500 m, during the baseline and construction phases. Results and significance of the z-test
for two proportions presented for three comparisons: 1) with no vessels present
in the baseline vs. during construction; 2) with vessels present in the
baseline vs. during construction; and 3) with vessels present in the baseline
vs. with no vessels present during construction. (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.)
|
|
Baseline |
Construction |
No vessels Base-Constr |
Vessels Base-Constr |
Vessels Base - No vessels Constr |
|||||
|
Behavioural state |
No vessels |
Vessels |
No vessels |
Vessels |
z-value |
p-value |
z-value |
p-value |
z-value |
p-value |
|
Feeding |
0.23 |
0.44 |
0.45 |
0.40 |
2.944 |
0.003 |
-0.499 |
0.617 |
-0.273 |
0.787 |
|
Milling |
0.20 |
0.21 |
0.13 |
0.24 |
-1.425 |
0.153 |
0.565 |
0.569 |
1.883 |
0.060 |
|
Resting |
0.08 |
0.03 |
0.02 |
0.01 |
-2.178 |
0.029 |
-0.780 |
0.435 |
0.698 |
0.484 |
|
Travelling |
0.48 |
0.32 |
0.41 |
0.34 |
-1.030 |
0.303 |
0.269 |
0.787 |
-1.404 |
0.162 |