(IN) Acoustic study to help in preserving Chilka Lake dolphins

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Acoustic study to help in preserving Chilka Lake dolphins

 

Source: Acoustic study to help in preserving Chilka Lake dolphins chilka lake,

irrawaddy dolphins, migration behaviour, technology research center

 

Bhubaneswar, Nov 22 (IANS) The underwater behaviour of the endangered Irrawaddy

dolphins of Chilka Lake in Orissa will now be monitored with special hydrophones

developed to catch their high-frequency ‘click’ sounds.

 

The Chilka Development Authority, along with the Underwater Technology Research

Center of Tokyo University, has developed the hydrophones that are being tested

in the lake. The devices would help in chalking out long-term conservation plans

for the endangered species, an official said.

 

‘This is the first time that such a study is being conducted to observe the

underwater behaviour of the Irrawaddy dolphins. The software for the hydrophones

has been developed by Underwater Technology Research Center of Tokyo

University,’ said Ajit Pattnaik, chief executive officer of the Chilka

Development Authority.

 

Studies have found that dolphins interpret the meaning of the click sounds

through its complex nerve system after the sound bounces off the objects.

 

The hydrophones are designed to capture the high frequency clicks which can

travel through water at a speed of about 1.5 km/sec, which is 4.5 times faster

than sound travelling through air.

 

These hydrophones have been designed to capture the clicks and underwater

behaviour of the dolphins.

 

‘These devices would help determine the responses of dolphins to approaching

boats and noise from the boat and other sources. It will also help to develop

protocols for dolphin watching,’ he said.

 

The data gathered from the devices would help in determining the size, shape,

speed and migration behaviour of the dolphins in the lake, without disturbing

them.

 

An MoU had been signed in 2006 to develop these devices and tests were also

conducted before these complete devices were decided on. The Japanese scientists

have now developed a set of eight devices with inbuilt software to interpret the

data. The World Wide Fund for Nature is also collaborating on the project.

 

Source: Acoustic study to help in preserving Chilka Lake dolphins chilka lake,

irrawaddy dolphins, migration behaviour, technology research center

 

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