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PCL data

Table 1. The median and the sum of the number of click and click trains performed by the dolphins in the three test scenarios. Bold numbers indicates higher values than the expected values (Chi2 Goodness of Fit test).

In table 1 the number of clicks and click trains produced by the dolphins towards the three test setups is reported. There was no significant differences found, between the three test scenarios in the total number of clicks, total number of clicks/dolphin, total number of click trains or in the average number of click trains/dolphin/observation hour.  However when performing a Chi-Square Goodness of Fit test on the total number of clicks, total number of click trains and the average number of click trains per dolphin per hour significant differences were found. The control setup was similar to the expected value in both the total number of clicks and click trains, although it was lower than the expected value when observing the average number of click trains per dolphin per hour. The float setup values were lower than the expected values and the fish setup values were higher than the expected values for all the variables (total number of clicks, total number of click trains and the average number of click trains per dolphin per hour).

Figure 1. The median number of clicks/click train recorded in the control, floats and the fish setups. Red circle marks the median. *= p<0.05.

A significant difference was found (Kruskal-Wallis test) between the median number of clicks per click train in the three test setups (Fig 1). When performing the Kruskal-Wallis multiple comparison it was found that the median number of clicks per click train was significantly higher in both the floats and the control setup versus the fish setup. No significant difference was however found between the floats and the control, there was only a tendency for the floats to have a higher amount of clicks/click train than the control.

 


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Last updated: 06/05/16