A new study says low-frequency sounds from human activities can affect squid and other cephalopods, not just whales and other marine mammals, which have long been thought to be vulnerable to such pulses. (See "U.S. Navy Sonar May Harm Killer Whales, Expert Says.")

The finding suggests noise pollution in the ocean is having a much broader effect on marine life than previously thought, said study leader Michel André, a marine bioacoustician at Barcelona's Technical University of Catalonia.

"We know that noise pollution in the oceans has a significant impact on dolphins and whales [which use natural sonar to navigate and hunt]. ... but this is the first study indicating a severe impact on invertebrates, an extended group of marine