WURSIG and WURSIG. BEHAVIOR AND ECOLOGY OF TCRSIOPS TRIWCATUS 

 8 



X 



1- 



Q. 

 Q 



390 



369 



Figure 4. — Mean depth of water in which bottlenose dolphins were found during different times of day (al- The numbers near points 

 represent number of theodolite readings gathered for that hour of day. The higher number of readings around midday is a result of 

 increased work with the theodolite at that time; it does not represent an increase of dolphins in the area. Instead, the incidence of 

 dolphin sightings was about equal for all daylight hours. These data were divided into different months lb. c i. Average depths  10 m are 

 clumped toward midday 1 10-13 h,P =0.014, Raleigh test. Greenwood and EKirand 195.5(. These deeper water peaks are significantly 

 different from shallow-water travel during the rest of the day for March, July, October, and November (P<0.01 in all 4 mo. 

 Kruskal-Wallis test in lieu of one- way ANOVA,Sokal and Rohlf 1969). In December and January, dolphins stayed in shallow water all 

 day, and this trend is different from data in b (P<-0.001, Mann-Whitney U test, Sokal and Rohlf 1969). 



403 



