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.