This video is called Lethal Sounds: Deadly Sonar Harms Whales.
From the BBC:
Monday, 14 March 2011
By Ella Davies
Earth News reporter
Beaked whales are disturbed by naval sonar, according to scientists.
A new study suggests that the whales are particularly sensitive to unusual sounds.
Measuring their reactions to both simulated sonar calls and during actual naval exercises, researchers found the whales fell silent and moved away from the loud noises.
The use of sonar for naval communication has been linked to beaked whales stranding in the past.
Scientists from the University of St Andrews, Scotland have been working with marine experts from around the world to investigate how sonar affects beaked whales in the Bahamas.
Beaked whales are an elusive group of small whales named for their elongated snouts.
However, they are probably best known for their connection to the possible risks that naval sonar poses to marine mammals.
For example, in 2000 and 2002, large groups of beaked whales stranded and died.
Naval exercises involving sonar communication were taking place nearby on both occasions, raising concerns that the whales’ deaths were directly linked to the mid-frequency signals.
Blainville’s beaked whales (Mesoplodon densirostris) have been identified foraging in the area by the navy’s acoustic monitoring equipment, used for listening to signals from submarines.
The scientists listened to the group of whales using these hydrophones – underwater microphones.
During live sonar exercises by the US Navy, the whales stopped making their clicking and buzzing calls, which they are thought to use to navigate and communicate.
“Results… indicate that the animals prematurely stop vocalisations during a deep foraging dive when exposed to sonar. They then ascend slowly and move away from the source, but they do resume foraging dives once they are farther away,” said David Moretti, Principal Investigator for the US Navy.
San Diego dolphin deaths linked to Navy training: here.
Beautiful encounter with friendly humpback whale calf last week on Silver Bank: here.
Digging for whale fossils in Virginia: here.
(Ecological Society of America) Noise pollution has been shown to cause physical and behavioral changes in marine life, especially in dolphins and whales, which rely on sound for daily activities. Now a new study in Frontiers in Ecology and the Environment (e-View), a journal of the Ecological Society of America, found that squid, octopus and cuttlefish exhibited massive acoustic trauma in the form of severe lesions in their auditory structures following exposure to low frequency sound: here. And here.
Whales Should Not Have to Suffer and Die for Military Practice: here.
April 2011: Research shows that low frequency sound, such as noise produced by offshore activities, causes lesions in the sensory organs of squid, octopus and cuttlefish: here.
Blainville’s beaked whales go silent in shallow waters, a stealth tactic that prevents them being found by predatory killer whales: here.
March 2012. The mass stranding event of common dolphins in Cape Cod that started in January 12, 2012 officially ended on February 16th with a total of 179 stranded dolphins (Found dead: 108; Found alive: 71 – Of which 53 were successfully released). Since no new dolphin strandings were reported during seven full days after that date, the event was considered to have finished. However more dolphins have been stranding since 1st March: here.