The end of the Sharon Nieukirková, specialist in acoustics that individual records from dozens of buoys and probes analyzed. "The new sound is unmistakable. The first low-frequency part Stenava is typical for baleen whales (suborder of cetaceans, which has teeth, but strip-ferrule, with which the filtered water from the food), but its highly sharp vibratory finishing is very unusual. In combination, including those crazy pieces, it's something completely new. The specialty of it is also because very often on the new call baleen hit. "
American English describes the nature mentioned širokofrekvenčního sound as "twangy" and this great vocal performance is truly unique among cetaceans. It takes between 2.5 to 3.5 seconds and is divided into five consecutive parts. It begins deep tone with a frequency below 38 Hertz, and its metallic synthetic "metal" finale overshoots 8000 Hz. Nieukirková and colleagues therefore call recording included under the title "Západopacifický biotwang". To detect specific whale species, however, this soundtrack is not enough.
A probe hydrophone issued the first alert to the east of Guam during the dive to 1,000 meters and a call came from a much greater depth of about eight kilometers. Indeed, the Mariana Trench, stretching from Japan to the north of Australia, is the deepest place on the planet Earth and yet represents nearly biologists unexplored territory. "I guess you could say that the deepest place on Earth will be very quiet, but actually seeing the whole range of sounds and noises," says oceanographer Robert Dziak (NOAA).
"Probably the closest západopacifickému biotwangu is called. Star Wars call that belongs to plejtvákům dwarf along the Great Barrier Reef," says Nieukirková. Their singing is subject to a number of local variants and are typical loud sound "boing" (which not only fans of the Star Wars missile sounds may resemble spaceships). These cetaceans moreover its call varies depending on whether the moving waters of the Atlantic or Pacific Ocean north. Otherwise about them marine biologists do not know much more.
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"Due to the similarity of some distant sounds západopacifického biotwangu and star-wars boing, their complexity, structure, frequency and metallic finish, it can be assumed that the probable cause of the sound will also fin dwarf," says Nieukirková. But certainly not plentiful. Indeed whales communicate by calling especially during mating or forming flocks. A single and the second takes place in the western Pacific in winter. Západopacifický biotwang however, was recorded several times outside this period. "If it is thus the call to lure mating or why it echoes throughout the year?" Says Nieukirková. "It's just a mystery."
Marine biologists from the Oregon now will try to determine what proportion is calling západopacifického biotwangu in summer and winter, how often is heard and in which areas. Sound Recorder also published so that it can listen to other colleagues in the world. A chance to bring things a little light could then increase. And at the end of this research may also become fairly new, previously unknown type of whale.
Author: Radomír Dohnal
Source: Ekolist.cz