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February 8, 2012
The noise of the boats put under stress the whales that are near, says a boat propeller estudio.Las emit sounds at the same frequency range that some whales use to communicate and previous studies showed that cetaceans change their communication patterns in noisy.
Now the researchers measured stress hormones in the feces of whales and found that increased as the density of vessels.
The species studied in the Bay of Fundy in Canada, was the North Atlantic right whale is in danger of extinction. It was thought that the sixteenth century Basque whaling decimated their population.
However, more recent studies suggest that reducing their number was long before for reasons that are unclear.
Dr. Rosalind Rolland of the New England Aquarium in Boston, USA, who led the new study, said that an estimated current population is 490 individuals, after being in 350 individuals over a decade.
The North Atlantic right whale (Eubalaena glacialis) moves up and down the east coast of North America, usually up to the Bay of Fundy in late summer to feed.
Aquarium scientists have been studying in the bay since 1980. But the new study in the journal Proceedings Royal Society B occurred by chance.
Publicado por Persiventana Solutions en 11:56:00 PM