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Dawn choruses, on the other hand, are much less common, particularly in temperate waters, says Doug Cato, a bioacoustician at the Defence Science and Technology Organisation in Australia.
"The tools available to both acquire and analyze passive acoustic data have undergone a revolutionary change over the last ten years, and have substantially increased our ability to collect acoustic information and use it as a functional management tool," said Sofie Van Parijs, lead author and a bioacoustician at NOAA's Northeast Fisheries Science Center laboratory in Woods Hole, Massachusetts.
The researchers found "the echo structure from similar sized but different species of salmon were different and probably recognizable by foraging killer whales," bioacoustician Whitlow Au of the Hawaii Institute of Marine Biology said in a release.