Tag Archive: whales

The danger of noisy oceans

Photo credit: Samuel Blanc licensed under CC BY-SA 3.0

We have posted before about how ocean noise is causing damage to various species of whales, so it should be no surprise to hear that human noise has thoroughly invaded our oceans. The Islands’ Sounder spoke to Christopher Clark, a bioacoustic engineer who he studies biology and acoustics, who discusses how “ambient noise from ships” interfered with his research on whales. Clark said that “[w]hat was eerie was that he could hear [ships’] rumble, but the ships were so far away they might as well have been invisible.” “North Atlantic right whales, like the Southern resident Orcas, are endangered,” adds Clark, who “suspects noise is a contributing factor for both species.” “You can’t listen to the ocean for any length of time without encountering human noise,” he laments.

The damage is not limited to whales, as ocean noise is damaging other species. Matt Soergel,The Florida Times-Union, reporting on research on dolphins in the St. Johns River, writes that researchers were surprised to find that “there’s no place [in the area they studied] immune to man-made sound,” and they are not sure why.  As for the effect on dolphins, the researchers aren’t quite sure, but “dolphins, especially in the murky tannin waters of the St. Johns, rely on sound to communicate and to hunt,” and the St. Johns’ dolphins have shown a decline in health.

And seals are suffering too, as researchers from the University of St. Andrews have discovered that “[s]eals may experience hearing loss from underwater vessel noise.” Although the researchers have said that there was “no evidence that seals were exposed to noise levels high enough to cause permanent hearing damage,” lead author Dr. Esther Jones added that “[u]rbanisation of the marine environment is inevitably going to continue, so chronic ocean noise should be incorporated explicitly into marine spatial planning and management plans for existing marine protected areas.”

Noise is not just a nuisance, it’s a public health issue for all species on this planet.

 

 

 

Why do whales beach themselves?

A new study suggests that they are trying to escape noise, reports news.com.au. The study “has found that startled beaked whales swimming away from low frequency sonar boost their energy consumption by more than 30 per cent.” Why is this important? Because the “study showed a big difference in the energy cost of whales swimming normally and attempting to escape danger,” and suggested that “In some cases fleeing whales might run out of steam and become washed up on beaches.”

Noise is not just a nuisance.

Link via Hyperacusis Research.

Mystery noise no longer mysterious:

The mystery of the ‘alien call’ deep in the Mariana Trench is solved. So, what’s the answer?  , wired.co.uk, writes that scientists at Oregon State University’s Hatfield Marine Science Centre, which named the sound the “Western Pacific Biotwang,” “likely represents the discovery of a new baleen whale call.”  So mystery (sorta) solved!

The cause of this noise is not a mystery:

not-quite-whales

Whales Would Probably Like Us To Make Less Noise In The Ocean.  Alasdair Wilkins, Vacativ.com, writes:

Whales’ haunting songs already suggest a complex form of communication beyond our easy understanding. Now it turns out we only knew half the story, as whales might also communicate through low-frequency vibrations they send through the water. Biologists only recently discovered this ability, and it might mean all our shipping and undersea drilling have been making a ton of unwanted, vibration-heavy noise for whales.

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