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Table 1.

Study sites, morphological information and summary diving statistics for study animals

SealIndex of fatnessFatness categoryaNumber of deepbdivesPrimary descent swimming behaviorcDive depth (m)Dive duration (min)Descent+Ascent time (min)Bottom time (min)Post-surface time (min)Body angle in descentd and ascent (degrees)
Big Razorback Island           
Sarah 0.87 Fatter Stroke-and-glide 297.9±164.7 (403.8) 19.1±11.3 (26.7) 12.0±6.6 7.1±5.0 7.7±3.5 26.6±2.5 (29.2) 
Mumin 0.87 Fatter 12 Stroke-and-glide 232.9±80.4 (290.3) 16.7±6.4 (22.1) 9.9±3.3 6.8±3.5 7.1±4.6 27.4±1.4 (29.5) 
Emmalian 0.78 Fatter 23 Stroke-and-glide 248.6±111.2 (405.8) 18.1±5.7 (25.2) 10.4±3.9 7.7±4.2 6.3±3.0 24.7±4.2 (30.1) 
Jumbo 0.75 Thinner 29 Prolonged glide 247.7±42.0 (293.3) 18.2±4.3 (29.4) 9.9±3.7 8.3±4.0 3.8±1.5 25.3±6.1 (40.5) 
Turks Head           
Windy 0.72 Thinner 29 Prolonged glide 243.8±139.9 (398.8) 13.2±9.4 (25.3) 6.1±3.3 7.0±6.3 2.5±2.5 44.8±10.1 (66.5) 
Andrea 0.69 Thinner Prolonged glide 223.3±66.5 (328.5) 12.8±4.1 (16.6) 8.8±4.2 4.0±3.1 2.3±1.6 28.4±12.1 (53.8) 
Mina 0.74 Thinner 30 Prolonged glide 271.8±82.3 (364.0) 13.8±4.7 (20.2) 6.5±2.2 7.3±3.0 2.5±1.2 46.0±10.8 (66.4) 
Hiroko 0.71 Thinner 42 Prolonged glide 237.1±96.1 (391.5) 15.6±7.5 (27.2) 8.4±3.9 7.2±4.6 4.1±2.7 No data 
Pvaluee     0.10 <0.01 <0.0001 0.49 <0.0001 <0.0001 
SealIndex of fatnessFatness categoryaNumber of deepbdivesPrimary descent swimming behaviorcDive depth (m)Dive duration (min)Descent+Ascent time (min)Bottom time (min)Post-surface time (min)Body angle in descentd and ascent (degrees)
Big Razorback Island           
Sarah 0.87 Fatter Stroke-and-glide 297.9±164.7 (403.8) 19.1±11.3 (26.7) 12.0±6.6 7.1±5.0 7.7±3.5 26.6±2.5 (29.2) 
Mumin 0.87 Fatter 12 Stroke-and-glide 232.9±80.4 (290.3) 16.7±6.4 (22.1) 9.9±3.3 6.8±3.5 7.1±4.6 27.4±1.4 (29.5) 
Emmalian 0.78 Fatter 23 Stroke-and-glide 248.6±111.2 (405.8) 18.1±5.7 (25.2) 10.4±3.9 7.7±4.2 6.3±3.0 24.7±4.2 (30.1) 
Jumbo 0.75 Thinner 29 Prolonged glide 247.7±42.0 (293.3) 18.2±4.3 (29.4) 9.9±3.7 8.3±4.0 3.8±1.5 25.3±6.1 (40.5) 
Turks Head           
Windy 0.72 Thinner 29 Prolonged glide 243.8±139.9 (398.8) 13.2±9.4 (25.3) 6.1±3.3 7.0±6.3 2.5±2.5 44.8±10.1 (66.5) 
Andrea 0.69 Thinner Prolonged glide 223.3±66.5 (328.5) 12.8±4.1 (16.6) 8.8±4.2 4.0±3.1 2.3±1.6 28.4±12.1 (53.8) 
Mina 0.74 Thinner 30 Prolonged glide 271.8±82.3 (364.0) 13.8±4.7 (20.2) 6.5±2.2 7.3±3.0 2.5±1.2 46.0±10.8 (66.4) 
Hiroko 0.71 Thinner 42 Prolonged glide 237.1±96.1 (391.5) 15.6±7.5 (27.2) 8.4±3.9 7.2±4.6 4.1±2.7 No data 
Pvaluee     0.10 <0.01 <0.0001 0.49 <0.0001 <0.0001 

Values are means ± S.D.; maximum values are given in parentheses.

Dive depth, the maximum depth of the dive; dive duration, the time elapsed between the start and end of the dive; bottom time, the duration from the first ascent to last descent in each dive.

a

The population mean of 0.78 (Sato et al., 2002a) was used as the category boundary.

b

Dives deeper than 50 m were used for analysis.

c

See text for definitions.

d

Absolute angle in descent was used for calculation.

e

Kruskal—Wallis test was used.

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