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michel andre

on 14 April 2010

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Transcript of LIDO

-No/very little information on cetacean migration patterns in the North West Pacific
-Unique opportunity to learn
-Pressure from human activities: necessity of mitigation/conservation actions
2.Current hydrophone configuration
-Single hydrophones allow the detection of the presence/absence of cetaceans
-No information on distribution/migration patterns
-Limited to a certain area around the hydrophone
-Arrays of hydrophones allow the location/tracking of acoustic sources
-Cetaceans produce a wide variety of acoustic signals, from very low frequency sounds to ultrasonic clicks
-Odontocetes (toothed whales) produce mid- (a few kHz) to high frequency sounds (up to 110kHz) (communication and echolocation)
-Mysticetes (baleen whales) produce mid- (up to a few kHz) low frequency sounds (down to 20 Hz) (mainly for communication)
-This implies that the aperture of the array of hydrophones must be adapted to the sound characteristics to be able to track a majority of species present in the area of NEPTUNE. The aperture of the array being dependent on the wave length of the signal.
-Toothed whales: small aperture array in the order of a few meters
-Baleen whales: large aperture array in the order of a few kilometers
-Building small aperture arrays at different locations would allow to combine both above requirements
-Ideally: three (3) arrays around the continental edge, plus another one in deep waters
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