The US National Marine Fisheries Service (NMFS) – the federal agency charged with protecting whales and dolphins – has announced its intentions to give the US Navy a series of permits that will allow the deaths of nearly 350 whales and dolphins from explosions, sonar, and collisions with ships during future military exercises.
navy sonar A sonar device being lowered into the ocean by an anti-submarine squadron helicopter. Such devices generate slow-rolling sound waves topping out at around 235 decibels; the world’s loudest rock bands top out at only 130. Evidence shows that whales will swim hundreds of miles, rapidly change their depth, and even beach themselves to get away from the sounds of sonar. Image: U.S. NavyThe Best Science Writing Online 2012
Showcasing more than fifty of the most provocative, original, and significant online essays from 2011, The Best Science Writing Online 2012 will change the way…
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Dear EarthTalk: Is it true that military sonar exercises actually kill marine wildlife?
Veröffentlicht am 17.02.2013
Video Courtesy:Dana Point Whale Watch(2012): http://youtu.be/ZEXwlilZqnM
Mystery over the SEVEN-MILE long ’super mega-pod‘ of 100,000 dolphins spotted off the coast of San Diego. A group of over 100,000 dolphins spotted off the coast of San Diego caused a spectacle for nature watchers as they traveled together in an enormous pack. ‚They were coming from all directions, you could see them from as far as the eye can see,‘ Joe Dutra said after seeing the spectacle first hand.
Mr Dutra, who captains Hornblower Cruises, was out on his daily tour with a boat full of nature watchers when he spotted the massive group of dolphins.
‚I’ve seen a lot of stuff out here… but this is the biggest I’ve ever seen, ever,‘ he told the local NBC affiliate.
Dolphins typically travel in groups of anywhere between 15 and 200 which are called pods.
What Mr Dutra spotted on Thursday however is best described as a super mega pod given the astonishing size of the group.
He estimated that the trail of dolphins was seven miles long and five miles wide, and he was able to steer the boat alongside them for over an hour.
Experts are unable to pinpoint any specific reason as to why so many of the mammals were traveling together on this particular night.
‚They’re definitely social animals, they stick together in small groups. But sometimes, the schools come together,‘ marine expert Sarah Wilkin told NBC.
While it does seem like a once-in-a-lifetime experience, a very similar flock o
f thousands of dolphins were seen swimming together about this time last year.
At the end of February in 2012, an unspecified group of dolphins was spotted swimming about 65 miles north of San Diego, implying that there may be an unacknowledged migratory pattern.