WASHINGTON – Residents of Hanalei Bay on the Hawaiian island of Kauai woke up last weekend to a distressing sight: As many as 200 melon-headed whales, a small and sociable species that usually stays in deep waters, were swimming in a tight circle as close as 100 feet from the beach, showing clear signs of stress.
To keep the animals from beaching, the locals kept a vigil all day and through the night, until a flotilla of kayaks and outrigger canoes could be assembled to herd the animals back out to sea. So far, only one young whale has been found dead.
But among increasingly worried whale advocates and researchers, the event set off immediate alarm bells: Melon-headed whales are not known to beach themselves, and nothing like this mass stranding close call has occurred in Hawaii for 150 years.
Attention quickly focused on the Navy and its use of active sonar – a wall of sound sent out to find underwater objects that can reach the decibel levels of a jet engine. Sonar has been implicated in several recent mass whale strandings around the world, and the latest research has strengthened the association and suggested that the actual number of incidents may be far greater than anyone realized. The most recent study found that over the past 40 years, mass strandings of the most noise-sensitive whales off Japan occurred repeatedly in the waters near an American naval base, but were unknown in comparable areas elsewhere.
Several hours after the Hanalei Bay episode began, locals learned that a six-ship Navy fleet 20 miles out to sea had begun a sonar exercise the morning that the melon-headed whales headed toward shore.
Officials at National Oceanographic and Atmospheric Administration said it is too early to conclusively link sonar to the near-stranding, but they said their top priority is to learn more about the Navy exercise.
Ongoing battle
Unless a different and convincing explanation can be found, the Hawaii incident is destined to become the newest case study in a high-stakes battle between environmentalists and the military over a technology that has been a staple of Navy operations for decades. Marine mammal advocates say it has become increasingly apparent that sonar can lead to death for whales, porpoises and other sea creatures, and something must be done to limit its toll. But the military says that to protect the nation, it needs to use more sonar, not less.
Navy spokesman Jon Yoshishige in Hawaii said that the fleet does not believe its sonar had anything to do with the unusual drive to shore of the melon-headed whales. He said that Navy records initially showed that sonar wasn’t turned on until about 8.30 a.m. on July 3 – an hour after the first reports of whales in Hanalei Bay – but that a full investigation is now under way. He also said the fact that only melon-headed whales were affected suggests that sonar was not the cause, since sonar-induced strandings typically involve a number of species.
Joel Reynolds, an attorney with the Natural Resources Defense Council, which sued the Navy over its plans for a new global sonar system, called the Navy response “consistent with what we’ve seen in previous instances of strandings close to naval sonar activity – they say ‘We had nothing to do with it.’ Hopefully, a real investigation will determine if that’s true or not.”
The latest incident could hardly have come at a worse time for the military. A series of congressionally mandated conferences has been under way for months, under the auspices of the Marine Mammal Commission, to assess the effects of sonar and other underwater noise on whales, porpoises and dolphins, and the group is expected to make recommendations to NOAA and Congress next year.
In addition, this fall the Navy intends to unveil plans for its first-ever underwater sonar testing range. The so-far unpublicized proposal would establish a 10-to-20-square-mile range in the shallow waters off the Carolinas for sophisticated and intensive sonar training. The Navy says it needs the range to train sailors in detecting a new generation of inexpensive and “quiet” diesel submarines that several nations have acquired and that could be deployed to threaten the coastline.
The Navy, working with information and advice from NOAA, is just finishing an environmental impact assessment for the testing range. Details of the plan and its possible implications for sea creatures remain sketchy, but the waters off the Carolinas are known to be on the migratory routes of several species of whales.
Already reined in
The military has already been forced by a federal judge to limit deployment of a different sonar project – a $350 million cutting-edge, low-frequency sonar system it wants to deploy worldwide. The judge concluded last year that the government had not properly considered environmental effects before allowing the Navy to use the new sonar. That led to an agreement between the Navy and environmental groups to limit the sonar to a section of the Pacific Ocean off east Asia, but the Navy has appealed several aspects of the decision.
With these major new projects under way, the Navy suddenly has to deal with a problem involving old but still evolving technology that, until recently, was not seen as an environmental threat. Only after the stranding of 17 whales in the Bahamas during a sonar exercise in 2000 did the Navy acknowledge – a year later – that its traditional, mid-frequency sonar could be lethal to marine mammals. In 2002, a joint Spanish-American naval exercise off the Canary Islands had to be stopped after it, too, touched off the stranding and deaths of beaked whales, a deep-diving and generally reclusive animal.
Although the Navy has used “active” sonar – where ships send out sound to bounce off underwater objects – since World War II, the power of that mid-frequency sonar has increased over the years. The apparent link between this type of sonar and major whale strandings is a relatively new discovery, and it has put the Navy on the defensive. Several hours into the recent Hawaii incident, NOAA officials asked the Navy to stop its sonar exercise – which included two American and four Japanese ships – and the commanders complied.
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