Table 7.2 Proportion of time spent in each behavioural state in the absence and presence of vessels within 500 m

Behavioural state	Vessels absent	Vessels present	z-value	p-value
Feeding	0.23	0.44	-2.882	0.004
Milling	0.20	0.21	-0.164	0.870
Resting	0.08	0.03	1.593	0.111
Travelling	0.48	0.32	2.202	0.028

Results and significance of the z-test for two proportions indicate if behaviour significantly changes when vessels are present. Significant differences are indicated by bold text.