Press Esc to close

Dolphins decompress like humans

Last updated: 15 October, 2011
London, Oct 15 (PTI) 16:36 IST

Researchers have confirmed what many biologists have long suspected -- dolphins avoid the bends by taking long, shallow decompression dives after feeding at depth.

A team, led by Michael Moore at Woods Hole Oceanographic Institute, has based its findings on tiny bubbles which it has found beneath the blubber of dolphins that beached themselves, the 'Proceedings of the Royal Society B' reported.

The bubbles were discovered by taking ultrasound scans of the animals within minutes of stranding off Cape Cod in the US.

Many biologists believe that marine mammals do not struggle, as human divers do, with decompression sickness -- "the bends" -- when ascending from great depths.

In humans, breathing air at the comparatively high pressures delivered by scuba equipment causes more nitrogen to be absorbed into the blood and the body's tissues, and this nitrogen comes back out as divers ascend.

But marine mammals such as whales, dolphins, and seals are highly adept at dealing with the pressures of the deep.

They slow their hearts, collapse the tiny air-filled chambers in their lungs, and channel blood to essential organs -- like the brain -- to conserve oxygen, and limit the build- up of nitrogen bubbles in the blood that happens at depth.

However, Moore thinks it is "naive" to think that diving mammals do not also struggle with these laws of chemistry.

If dolphins, he explained, come up too quickly then there is evidence that they "grab another gulp of air and go back down again", in much the same way a human diver would "re-tank and re-ascend" to try to prevent the bends.

"But there's one place you can't do that (if you are a dolphin) and that's sitting on the beach," he was quoted by the 'BBC' as saying.

Go to Top

More from this section
Most trending stories
Photo Gallery
ASC Tornadoes rewrites record

ASC Tornadoes rewrites record

Karnataka Minister K J George unveils the Bengaluru Open 2017 trophy...

Karnataka Minister K J George unveils the Bengaluru Open 2017 trophy...

The holy shrine of Badrinath received moderate snowfall in Uttarakhand ...

The holy shrine of Badrinath received moderate snowfall in Uttarakhand ...

A Mathew and HDRL Thirimanne greet each other as they built up their partnership...

A Mathew and HDRL Thirimanne greet each other as they built up their partnership...

Tourists enjoy this winter's first snowfall at Manali, in Himachal Pradesh...

Tourists enjoy this winter's first snowfall at Manali, in Himachal Pradesh...

People watch an ill fated bus after an accident which killed many people in Latur...

People watch an ill fated bus after an accident which killed many people in Latur...

Manushi Chillar, center is crowned Miss World during the beauty pageant..

Manushi Chillar, center is crowned Miss World during the beauty pageant..

Players of North East United FC and Jamshedpur FC vie for the ball...

Players of North East United FC and Jamshedpur FC vie for the ball...

Manushi Chillar is crowned Miss World during the beauty pageant...

Manushi Chillar is crowned Miss World during the beauty pageant...

Bangalore ATP Challenger

Bangalore ATP Challenger

Like us on Facebook

Copyright 2017, The Printers (Mysore) Private Ltd., 75, M.G Road, Post Box 5331, Bengaluru - 560001
Tel: +91 (80) 25880000 Fax No. +91 (80) 25880523
Powered by Yodasoft Technologies Pvt. Ltd.