Aim:

The aim of this study was to enrich the dolphin pool with good acoustically reflective objects that were suspended within the water column, in order to encourage echolocation use. This study evaluated if and in which way these objects were used by the dolphins, e.g. as acoustic landmarks, or play objects. This study also looked at general echolocation click production over a period of 3 months and analysed diel and swimming patterns.

Hypothesis:

R₀1: the dolphins do not use the click loggers as landmarks

R₀2: The dolphins do not use echolocation to a large extent

R₀3: The echolocation activity is evenly distributed at night and during day-time

R₀2: The echolocation activity is not correlated to light levels