NUMBER OF SAMPLES 
tN 9 ts TT nd OD) 
secsccscoecess CLICK CHORUS (S) 
One GRUNT (S) 
SUNSET SUNRISE. GO: =====" GRUNT (D) 
' NS 
Wal 16 8618 20 22 24 2 4 6 8 i WZ 
HOUR OF SAMPLE 
Figure 10. Diurnal distribution curves for three 
sound categories with marked diurnal patternings 
based on the number of hourly samples in which a 
particular sound was heard, regardless of how 
many times within a sample it was repeated. Two 
sound categories were peculiar to the shallow 
water hydrophone (S), while the Rhythmic Grunt 
sound was common at both the shallow hydrophone 
and the deep hydrophone (Dye The curves were 
arithmetically smoothed. Sunset and sunrise 
occurred during the 1900 and 0500 sample periods. 
MOTOR BOATING (S) 
100 
co 
Oo 
lon 
Oo 
oS 
Oo 
nN 
oO 
PERCENT OF SAMPLES 
29 
