.35 

 .3 



i 



w 



I'5 



.1 - 



.05 - 



0*^ 



Day 



20 40 60 



I * I » I — •— 1 — •— 1 — • I • I 



80 100 120 140 160 180 200 220 240 



Dive Duration (sec) 



.35 



.3 



|.25 

 t 



1.15 



.1 - 



.05 -- 



TThhm 



Mght 



f=^ 



» I * I ' I ' I * — I — * — I • I < I — •— T — • I • I — »— T" 



20 40 60 80 100 120 140 160 180 200 220 240 



Dive Duraticn (sec) 



Figtire 9. Relative frequency histogrants of dive durations during day (a) and 

 night (b). Data are composed of concatenated 30-min samples, selected at 

 random, one from each dolphin, "n" refers to the number of individual 

 surfadngs, and is not a reference to any averaged 30-min sample. 



55 



