Dolphins suffer from decompression sickness

Researchers found in the blood of beached dolphins gas bubbles definitely speak for the fact that these marine animals, like humans, are subject to decompression sickness.

If people are too quick to rise from the depths to the surface happens to him bends. Components of a gas mixture such as nitrogen, helium, etc., are diluted oxygen, due to the high pressure at the depth dissolve in the blood, but, of course, are not digested by the body. Lifted to the surface pressure drops and the dissolved gases begin again to move to a gaseous state, forming multiple bubbles in the blood. They destroy the cells of the blood vessels, blocking the blood flow in severe cases, bends can lead to paralysis and death.

But that man, being for the deep sea, quite frankly, strange. And how this animal, who not only live in the sea, but are free to move between the surface and deep layers? Biologists have long believed that whales, dolphins, seals, acquired during the evolution of a number of adaptive devices that avoid the "bends." To a depth animals slow down the heart rate, reduced lung capacity, redirect blood flow mainly in the most important organs such as the brain — and it seems that all these measures help to avoid unnecessary spending and oxygen saturation of the blood nitrogen.

But no matter how effective were the tricks of aquatic mammals, from the bends, they were found to not save. Group of oceanographers published in the journal Proceedings of the Royal Society B article that reported gas bubbles found in the kidney and liver of dolphins. Zoologists examined by ultrasound scanning eight Atlantic white-sided dolphins and 14 korotkogolovyh thrown on the coast to Cape Cod (Massachusetts). Three of them were examined for several minutes after being found in shallow water. Some of the animals survived, but some soon killed themselves — or they had to be put down.

Researchers say that the dolphin can avoid degassing during rapid rise of blood, if glotnuv air again plunged deep into the water. However, if for some reason the animal is in shallow water (or even stranded) bends an effect. Could it be that it was because of her dolphins are beaching themselves, the researchers say they can not.

And yet, while bends found in dolphins, the animals seem to have other mechanisms to mitigate the unpleasant effect of it and allow the dolphins to survive.

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