Ocean sound: Whales strained


According to researchers noise from ships stresses whales researchers have measured stress hormones in whale faeces, and found they raised with the density of shipping. But the new study, reported in the Royal Society journal Proceedings B, came about through chance.



Whale researchers registered a 6 decibel fall in the intensity of underwater noise, with the change particularly pronounced at frequencies below 150Hz.According to Dr. Rolland this is the first time that anyone's documented any physiological effect these are after all 50 tonne animals so they don't make terribly easy things to study. The research team would now like to set up a study that could relate stress hormones to ocean noise in a range of locations.

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