![]() ![]() With two or more hydrophones you can calculate the direction the sound came from, and figure out which whale made it. cable banging against the side of the boat), and hence are recorded much more strongly on the closest hydrophone. The marks you see on the top trace, but not the bottom one, are caused by cable noise (e.g. ![]() The “gunshots”, “up-calls” and moans are normal sounds made by the whales. This is part of a recording from right whales, made in Port Ross, at the Auckland Islands. We also use sounds to study communication in whales. We found that while the dolphins certainly use this area less in winter than in summer, they still use it on 41% of the days on which gillnets are allowed to be used.Īkaroa POD Monitoring download (PDF 566KB) One important component of this was to see whether and how often Hector’s dolphins use the upper harbour area which is open in amateur gillnetting from 1 March to 1 November each year. A recent example is that we moored three echolocation detectors in Akaroa Harbour, at Banks Peninsula, to find our how the dolphins use the harbour day and night, year-round. ![]() Sound as a component of habitat quality: Will Otago Harbour ever be as important to right whales as it was before whaling decimated their numbers?Ī great deal of our acoustic work is to find out how whales and dolphins use their habitat, in order to better protect the habitat that is crucial for them.
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