Earthweek: a Diary of the planet
Canadian scientists say the huge glaciers that blanket parts of the Yukon are shrinking much faster than what would be expected under global warming. The glacial retreat has cut off critical water supplies to Kluane Lake, causing the level of the UNESCO World Heritage Site to drop by more than 6 feet. This has stranded thousands of fish from their traditional spawning rivers. “The magnitude of the changes is dramatic,” said David Hik of Simon Fraser University. Underwater noise created by shipping is making it more difficult for dolphins to talk to each other, according to a study. University of Maryland researchers say the complex whistle calls used by the marine mammals are becoming simplified to make sure they can be understood through maritime traffic. Marine biologists made the discovery by analyzing recordings from microphones on the bottom of the Atlantic. An earlier Japanese study found that humpback whales reduce their songs when near loud noise from passing ships. For the week ending Friday, Nov. 2.