Table 1.

PCA results of behavioural metrics. (Only eigenvectors (EV) that explained more than 10% variance are shown for each parameter group.)

dive metrics	EV1	orientation metrics	EV1	EV2	horizontal metrics	EV1	EV2	EV3
dive time	−0.387	descent pitch	−0.392		horizontal speed (dive)		−0.437	0.523
maximum depth	−0.381	descent roll		0.328	surface speed (surface)		−0.244	0.686
post-dive surface time	−0.346	descent heading	−0.121	−0.521	horizontal turning rate 1		−0.651	−0.218
descent time	−0.340	Δ descent pitch	0.328	−0.230	horizontal turning rate 2		−0.568	−0.452
ascent time	−0.321	Δ descent roll	0.324		distance to sound source (dive start)	0.574
bottom time	−0.339	Δ descent heading	0.306	0.145	distance to sound source (dive end)	0.574
lunges	−0.343	ascent pitch	0.397		Δ distance to sound source	0.576
breaths	−0.366	ascent roll		−0.335
		ascent heading	−0.102	−0.578
		Δ ascent pitch	0.351	−0.279
		Δ ascent roll	0.339	0.12
		Δ ascent heading	0.341
proportion of variance	0.758		0.388	0.122		0.428	0.281	0.212