Table 1. Mean proportions of time engaged in specific behaviors at-sea by lactating northern fur seals from Bogoslof and St. Paul islands as determined from acceleration signals and depth sensors.

Variable	Behavior
	Dive		Rest		Shaking/Grooming		Rolling						Mixed		Prone
							Sine		W		Total
Bogoslof	0.292	(0.10)	0.072	(0.06)	0.096	(0.06)	0.047	(0.05)	0.227	(0.11)	0.274	(0.13)	0.155	(0.09)	0.111	(0.12)
St. Paul	0.284	(0.07)	0.081	(0.04)	0.073	(0.02)	0.086	(0.07)	0.245	(0.10)	0.331	(0.11)	0.143	(0.07)	0.087	(0.09)
Both Islands
Cathemeral	0.295	(0.07)	0.087	(0.04)	0.084	(0.03)	0.060	(0.03)	0.261	(0.09)	0.321	(0.09)	0.146	(0.06)	0.067	(0.06)
Nocturnal	0.288	(0.10)	0.073	(0.06)	0.089	(0.05)	0.060	(0.06)	0.228	(0.11)	0.287	(0.13)	0.152	(0.08)	0.110	(0.11)
Off-shelf	0.291	(0.10)	0.074	(0.06)	0.090	(0.05)	0.057	(0.06)	0.227	(0.11)	0.283	(0.13)	0.153	(0.09)	0.109	(0.11)
On-shelf	0.284	(0.06)	0.080	(0.04)	0.082	(0.02)	0.074	(0.04)	0.263	(0.10)	0.336	(0.10)	0.142	(0.06)	0.076	(0.08)
St. Paul only
Cathemeral	0.295	(0.07)	0.087	(0.04)	0.084	(0.03)	0.060	(0.03)	0.261	(0.09)	0.321	(0.09)	0.146	(0.06)	0.067	(0.06)
Nocturnal	0.274	(0.07)	0.077	(0.04)	0.065	(0.02)	0.108	(0.08)	0.232	(0.11)	0.340	(0.12)	0.141	(0.08)	0.104	(0.11)
Off-shelf	0.284	(0.08)	0.083	(0.05)	0.064	(0.03)	0.101	(0.08)	0.225	(0.10)	0.326	(0.11)	0.145	(0.08)	0.099	(0.10)
On-shelf	0.284	(0.06)	0.080	(0.04)	0.082	(0.02)	0.074	(0.04)	0.263	(0.10)	0.336	(0.10)	0.142	(0.06)	0.076	(0.08)

Proportions are averaged over foraging trips and stratified by island, forager type (cathemeral or nocturnal), and region (on or off-shelf). Standard deviations are in parenthesis.