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How do the dolphins withstand the water pressure and temperature at the depth where it lives?
Wiki User
∙ 16y ago
Sperm whales and the bottle-nosed dolphin are know to dive to depths near the record possible in pursuit of their food. The greatest difficulty experienced in such excursion is maintaining the proper ratio of blood gases. This is a problem for human divers as they take their air supply with them - but as whales and dolphins don't breath when they dive the whole of this complex science isn't applicable to them.
The truly horrific pressures at these depths are managed by matching the blood pressure to the external pressure. Cod-fish hauled up from great depths bloat something terrible which is what happens to deep-sea divers if they don't go through a prolonged decompression after the dive. Whales and dolphins however don't exactly increase their blood pressure. What they do is let their blubber (of which they have considerable) compress. This results in an constrictive pressure for the body. Whale and dolphin actually shrink a little in size when they go down. When they come up (quickly) the blubber decompresses and the internal pressure of the animal returns immediately to normal without the blood pressure ever having increased in and of itself
The temperature of (pure) water never goes below +3'C this is where water is the most dense. If you decrease the temperature of (pure) water any further it actually become less dense and proceeds to float. This is why ice floats on water. So the depths of the ocean is never below +3'C. This is cold but not terribly, it won't produce frost bite. Whales and dolphins are insulated by layers of blubber and really don't spend all that long in the depths. Think of sauna enthusiasts running from a sauna and jumping into freezing water. This is far more a temperature difference than what whales and dolphins experience in diving to the depths and the change happens far more slowly. If sauna enthusiasts find the experience 'pleasurable' why should whales and dolphins be discouraged by something far less traumatic.
Wiki User
∙ 16y ago
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No.
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Both increase.
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