In the water, sound is the most effective way for sensing and communication. Many of aquatic animals produce sounds for their mating, echolocation, territorial defence and alarting. Those sounds can be used as a key to identify presence/movements/migration of animals remotely. An underwater acoustic remote sensing of marine organisms is newly developping subject. It contributes not only for basic marine biological science, but also the environmental impact assessment of renewable energy harvesting and shipping noise.
web page launched
This web page (Underwater Bioacoustics) has been launched.
A-tagis a multi-platform acoustic detector for dolphins, porpoise and shrimps.
Monitoring of coral reef echosystem by underwater biological sounds
Bleaching of corals was serious in 2016 due to the high water temperature globally. Consequently, ecosystems in coral reefs changed quickly and its biodiversity would be reduced. In this research, we will try to measure the biodiversity using repertoire of biological sounds as an index. The underwater sounds will be monitored in real-time and biodiversity map will be provided.
CREST : Development of remote species identification technologies for marine organisms
Sustainable use of marine bio-resources and protection of environment will be realized if distribution and movement of each aquatic species will be provided on the Internet like a weather forecast. We will develop remote identification technologies of species and numbers of organisms without catching or viewing them. Identification of species and counting number of individuals will be conducted by passive and active sonar systems. The goal of this project is to develop remote identification method for every aquatic species including planktons and whales in the ocean echo system as well as the environmental factors such as human impacts and earthquakes using cutting-edge acoustic technologies.
Finding most silent lake in Japan
Low frequency sound calibration of underwater microphone (hydrophone) is essential for the assessment of effect of underwater noise on aquatic animals. Supported by KAKENHI, most silent lake, which is suitable for the low frequency sound playback and reception will be identified.
Effect of ship noise on humpback whales
Ocean noise pollution is getting to be a major issue for the environmental assessment of maritime transportation and engineering. A Japanese team launched a new project to observe possible effects of ship noise on humpback whales in Ogasawara archipelago.