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Whale songs drowned out by human noise pollution
Key Excerpts from Article on Website of Seattle Post-Intelligencer/Associated Press
Posted: December 12th, 2008
http://seattlepi.nwsource.com/national/390534_noisyseas04.ht...
The songs that whales and dolphins use to communicate, orient themselves and find mates are being drowned out by human-made noises in the world's oceans. That sound pollution -- everything from increasing commercial shipping and seismic surveys to a new generation of military sonar -- is not only confounding the mammals, it also is further threatening the survival of these endangered animals. Studies show that these cetaceans, which once communicated over thousands of miles to forage and mate, are losing touch with each other, ... experts said at a U.N. wildlife conference in Rome. "Call it a cocktail-party effect," said Mark Simmonds, director of the Whale and Dolphin Conservation Society, a Britain-based NGO. "You have to speak louder and louder until no one can hear each other anymore." Environmental groups also are increasingly finding cases of beached whales and dolphins that can be linked to sound pollution, Simmonds said. Marine mammals are turning up on the world's beaches with tissue damage similar to that found in divers suffering from decompression sickness. Scientists say the use of military sonar or seismic testing may have scared the animals into diving and surfacing beyond their physical limits. Several species of cetaceans are already listed as endangered or critically endangered from other causes, including hunting, chemical pollution, collisions with boats and entanglements with fishing equipment. Though it is not yet known precisely how many animals are affected, sound pollution is increasingly being recognized as a serious factor, the experts said.
Note: For many reports on threats to marine mammals from reliable, verifiable sources, click here.
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