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	NATURE 1 VOL 425 9 OCTOBER 2003		NATURE 1 VOL 425 Gas-bubble lesions in stranded cetaceans. Was sonar responsible for a spate of whale deaths after an Atlantic military exercise? - There are spatial and temporal links between some mass strandings of cetaceans - predominantly beaked whales - and the deployment of military sonar. Here we present evidence of acute and chronic tissue damage in stranded cetaceans that resuIts from the formation in vivo of gas bubbles, challenging the view that these mammals do not suffer decompression sickness. The incidence of such cases during a naval sonar exercise indicates that acoustic factors could be important in the aetiology of bubble-related disease and may call for further environmental regulation of such activity.

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