Whales are known for belting out sounds in the deep. But they may also whisper.Southern right whale moms steer their calves to shallow waters, where newborns are less likely to be picked off by an orca. There, crashing waves mask the occasional quiet calls that the pairs make. That may help the whales stick together without broadcasting their location to predators, researchers report July 11 in the Journal of Experimental Biology.
While most whale calls are meant to be long-range, “this shows us that whales have a sort of intimate communication as well,” says Mia Nielsen, a behavioral biologist at Aarhus University in Denmark. “It’s only meant for the whale right next to you.”
Nielsen and colleagues tagged nine momma whales with audio recorders and sensors to measure motion and water pressure, and also recorded ambient noise in the nearshore environment. When the whales were submerged, below the noisy waves, the scientists could pick up the hushed calls, soft enough to fade into the background noise roughly 200 meters away.
爱上海419
An orca, or killer whale, “would have to get quite close in the big ocean to be able to detect them,” says biologist Peter Tyack at the University of St. Andrews in Scotland. Tyack was not involved with the study, but collaborates with one of the coauthors on other projects.
The whispers were associated with times when the whales were moving, rather than when mothers were stationary and possibly suckling their calves. Using hushed tones could make it harder for the pair to reunite if separated. But the observed whales tended to stay close to one another, about one body length apart, the team found.
Eavesdropping biologists have generally focused on the loud noises animals make, Tyack says. “There may be a repertoire among the calls of lots of animals that are specifically designed only to be audible to a partner who’s close by,” he says.
相关文章A crucial building block of life exists on the asteroid RyuguUracil, a building block of life, has been found on the asteroid Ryugu. Yasuhiro Oba and colleagues discovered the precursor to life in samples collected from the asteroid and returned to Earth by Japan’s Hayabusa2 spacecraft, the team reports March 21 in Nature Communications. “The detection of uracil in the Ryugu sample is very important […]
A massive crater hides beneath Greenland’s iceThere’s something big lurking beneath Greenland’s ice. Using airborne ice-penetrating radar, scientists have discovered a 31-kilometer-wide crater — larger than the city of Paris — buried under as much as 930 meters of ice in northwest Greenland. The meteorite that slammed into Earth and formed the pit would have been about 1.5 kilometers across, researchers […]
NASA’s Mars 2020 rover will look for ancient life in a former river deltaThe next NASA Mars rover will hunt for signs of ancient life in what used to be a river delta, the agency announced on November 19. The rover is expected to launch in July 2020 and to land on Mars around February 18, 2021. It will seek out signs of past life in the sediments […]
Neutrino discovery launched a new type of astronomyMysterious particles called neutrinos constantly barrel down on Earth from space. No one has known where, exactly, the highest-energy neutrinos come from. This year, scientists finally put a finger on one likely source: a brilliant cosmic beacon called a blazar. The discovery could kick-start a new field of astronomy that combines information gleaned from neutrinos […]
还没有评论,来说两句吧...