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Underwater Ears Reveal Dolphin Secrets in Japan
19 Jul
Summary
- Dolphin sounds detected only once every 10 days in bays.
- Passive acoustic monitoring used to track elusive marine mammals.
- Study highlights value of underwater sound for conservation.
Dolphin activity in two bays along Japan's Sea of Japan coast is less frequent than local anecdotal evidence suggested. Researchers from Kyoto University discovered that dolphins visit Wakasa Bay and Aso Bay only occasionally, with their distinctive sounds recorded approximately every 10 days. This finding stems from a nearly three-year study employing passive acoustic monitoring.
The research team deployed underwater microphones, or hydrophones, to listen for dolphin echolocation clicks and whistles. This method proved effective in detecting the animals, even when they remained unseen near the surface. The study, which relied on community involvement for device deployment and data sharing, identified the likely visitors as Indo-Pacific bottlenose dolphins.
This investigation provides vital, previously scarce information on the presence and behavior of small toothed whales in the Sea of Japan. The insights gained are expected to support marine conservation initiatives and the sustainable use of coastal waters by local communities. Continued acoustic monitoring offers a powerful tool for tracking environmental changes affecting marine life.
