A federal district court has approved a settlement between the Navy and a NRDC-led coalition of environmental groups that will limit training missions using Low-Frequency Active Sonar to several specific regions in the Paciific Ocean. Negotiations were ordered by the court after NRDC challenged the legality of permits the Navy received which would have allowed nearly worldwide use of the powerful submarine-detection system. Ed note: in practice, the Navy’s two LFAS-equipped ships have remained in the western Pacific, where they can monitor Chinese and North Korean subs. The new agreement allows the Navy to use LFAS in more areas than were allowed under a similar agreement several years ago, including waters near the Philippines and Japan (with seasonal restrictions), as well as areas north and south of Hawaii, while explicitly banning its use in some biologically important areas, including marine sanctuaries near Hawaii. Read the rest of this entry »

As a new UK Navy report suggests that beaked whales made “potentially very significant” behavioral changes in response to mid-frequency active sonar signals, a team of scientists has just completed a pilot study that involved monitoring the detailed behavior of whales during a major Naval exercise. The UK military report details observations of whale activity during Operation Anglo-Saxon 06, a submarine war-games exercise in 2006. Produced for the UK’s Defence Science and Technology Laboratory, the study used an array of hydrophones to listen for whale sounds during the war games. Across the course of the exercise, the number of whale recordings dropped from over 200 to less than 50. “Beaked whale species appear to cease vocalizing and foraging for food in the area around active sonar transmissions,” said the report.  Read the rest of this entry »

As the US Navy approaches the end of the month-long multinational RIMPAC training exercise in waters around Hawaii, a single Cuvier’s beaked whale has turned up on a Maui beach. After several hours of near-shore struggle, it was euthenized and taken to Hawaii Pacific University for a necropsy, to attempt to determine the cause of death. Beaked whales have been the most common species associated with sonar-induced strandings, but previous incidents have usually involved several animals at a time. It is unclear how close sonar exercises were to the stranding site, though the Navy initiated aerial surveys of coastlines within ten miles of the Maui site, and did not see any other stranding victims. Read the rest of this entry »

For the first time, researchers will have the chance to see in detail how beaked whales respond to actual military active sonar exercises, thanks to two studies taking place during the biannual RIMPAC exercises around Hawaii this month. RIMPAC, the world’s largest multi-national naval exercise, involves 20,000 troops from ten countries, and runs through July. One team will be tracking dive patterns only on 30-35 whales, while researchers from another team will attach suction-mounted D-tags to beaked whales; the tags remain attached for several hours before falling off and rising to the surface for retrieval. While attached, the tags track the dive patterns of the whales, as well as recording all sounds, so that researchers can hear what sound level triggered any observed behavioral changes. D-tag studies have been an increasingly valuable research tool over the past several years, but until now, had been used only in controlled experimental settings (with researchers making or playing sounds in the vicinity), rather than in “real world” settings. Sources: AP, 7/3/08 [READ ARTICLE]

The US Navy has released its first completed Environmental Impact Statement examining active sonar training activities, this one covering training in waters around Hawaii, and proposing to continue current Navy operating procedures, rather than adopting more stringent safety measures. Eleven other regional training ranges are receiving similar scrutiny, with draft EISs released for two, and the final decisions planned for all by the end of 2009. Read the rest of this entry »

The appearance of beaked whales on beaches always raises concern about possible sonar impacts, since these deep-diving whales are the family that is apparently most sensitive to mid-frequency active sonar. Over the past couple of weeks, two beaked whales stranded, one dead near Atlantic City, one alive in Florida. The Florida whale has been diagnosed with meningitis, along with infections in multiple organs and a heavy parastic infection in its liver. The whale was too ill to return to the sea; it was euthanized after Navy scientists conducted hearing tests, which have rarely been possible with beaked whales. The Atlantic City whale underwent a necropsy; initial results did not show any clear cause of death or weakness. The Navy has said that there has been no active sonar activity within a hundred miles of Atlantic City since a major exercise ended in early June; while this does not preclude the possibility that the whale was injured while escaping sonar signals, the single animal does not match earlier incidents that involved multiple animals or species. A beaked whale that stranded in the same area in December had an inner ear infection, which could have contributed to its stranding. While ongoing research and closer public scrutiny are offering a clearer sense of the ways that sonar affects beaked whales (especially triggering dangerous/injurious fleeing behavior), it is also important to remember that not every dead whale is a victim of sonar impacts. Sources: CBS4.com, 6/25/08 [READ ARTICLE] Press of Atlantic City, 6/29/08 [READ ARTICLE]

Kvadsheim, Benders, Miller, Doksaeter, Knudsen, Tyack, Nordlund, Lam, Samarra, Kleivane, Godo. Herring (slid), killer whales (spekknogger) and sonar – the 3S-2006 cruise report with preliminary results. Norwegian Defence Research Establishment (FFI). 30 April 2007 
This paper reports preliminary results from an ambitious multi-national Controlled Exposure Experiment using acoustic D-tags, which allow researchers to record received sound levels while charting dive patterns. Six orcas were tagged, with 17 hours of data collected, with one animal exposed to LFAS signals, two to mid-frequency active sonar signals, and one used as a control, fewer samples than hoped. The whale exposed to LFAS signal did not change its behavior, nor did its companions. However, the group exposed to mid-frequency sonar signals ceased feeding and moved rapidly away; in addition, they exhibited an unusual dive pattern, Read the rest of this entry »

The US Navy continued its increasingly adamant defense of its mid-frequency sonar training program this week, with the US Pacific Fleet Commander telling reporters that court-ordered restrictions are making it more difficult to train. Admiral Robert Willard said that one of his strike groups showed “adequate, although degraded” anti-submarine warfare proficiency during recent exercises off California. The fleet certified the group anyway, but noted the ships altered standard techniques and procedures to comply with court rulings. Willard said sailors were learning artificial tactics they wouldn’t use in the real world. “Translate that into the Western Pacific or into the Middle East, where quiet diesel-powered submarines exist in large numbers, and we’re potentially in trouble,” Willard said. Meanwhile, during a field trip to a Navy destroyer off the coast of Virginia, Jene Nissen, the Navy’s environmental acoustics manager, said the Navy was working hard to align their practices with what scientists say is necessary, stressing the lack of any strandings “linked scientifically” to Navy activities during 40 years of presence on the east coast. Some of the scientists on board as experts for the press questioned the Navy’s absolute assurance, noting several incidents in which mid-frequency sonar is suspected of causing strandings or agitated reaction among whales, though absolute proof was not found. Nina Young of the Ocean Leadership Consortium (a program that coordinates several agency ocean programs) said the Navy uses uncertain cause of death rulings to downplay possible links between sonar and mammals. “It’s unfortunate that the threshold for the Navy seems so absolute, and the burden of proof so high, that it undermines efforts to engage in a productive discussion, she said. Andrew Wright, a marine mammal scientist who has worked for the Marine Mammal Commission and NOAA, said definitive proof of sonar’s effect on whales didn’t exist until recently. “We’ve only really known about the problem since 2000, 2002. We don’t have long-term information, even on humans,” Wright said later. “There’s so much uncertainty around this, and it all depends on where you place the burden of proof.” Sources: The Virginian-Pilot, 6/16/08 [READ ARTICLE]  San Diego Union-Tribune, 6/10/08 [READ ARTICLE]

In the wake of the Falmouth Bay strandings, the UK Navy has announced that it has been testing a new approach to “shock trials,” meant to be less dangerous for marine life. Shock trials test the resilience of ships to mines and torpedoes, typically accomplished by setting off large explosions near the ships. The new technique uses airguns, which release blasts of compressed air, in place of explosives. A Ministry of Defense spokesman said that the resulting pressure waves are less intense, adding that “the new approach reduces the risks to the environment as the only by-product is hot air bubbles.” This statement neglects to mention that another by-product is intense noise, and that, to fulfill its purpose in testing the resilience of ships, there is also a strong pressure wave created. Likely the airgun pulse is less sudden (i.e., the sound wave has a longer rise time), which may help reduce hearing-related damage, but it, like all airguns, will create a startling sound at close range (up to a km or so), and be audible for tens of kilometers at least. The brief press mention of this new “dolphin-friendly weapon” did not clarify whether the system was being used around Falmouth Bay at the time of the strandings; local reports indicate unusual explosive sounds were heard. Source: London Sunday Mirror, 6/15/08 [READ ARTICLE]

Reports of unusual stranding events around the world this week are each triggering questions about possible sonar connections, despite little clear evidence thus far. In Madagascar, over fifty melon-headed whales stranded and died after becoming trapped in a bay; in the UK, 26 common dolphins (mostly juviniles) died along the shores of an estuary river a pod of fifteen strayed into, likely feasting on fish feeding at an algae bloom, with up to seventy more following in the hours that followed, perhaps responding to their distress calls; other dolphins were found dead on two other nearby shorelines within 15km, including another estuary. In Japan, three Cuvier’s beaked whales have been found dead on beaches in the past three weeks, the latest of 81 whale fatalities (9 of them Cuvier’s) since March. Read the rest of this entry »

After routine pre-deployment training exercises in Hawaii, some Navy personnel have complained that the differing operational requirements imposed by federal courts in Hawaii and California are complicating, and at times compromising, their mission. Rear Adm. James P. “Phil” Wisecup, commander of the strike group, said the changing sonar rules “just complicate things” in a warfare area that’s already very complex. “In the end, just give me a standard, and I can meet it,” Wisecup said, “But if the standard changes — and it is changing from one area to another — as different judges interpret the law and make decisions on a very complex issue — then we have to adapt.” Read the rest of this entry »

Navy Releases Southern California Sonar Draft EIS, Proposals Fall Short of Court Orders – The Navy has released its long-planned Draft Environmental Impact Statement on offshore training exercises in Southern California, including the use of mid-frequency active sonar. Recent legal challenges to the Navy training, in which a circuit court judge imposed additional restrictions on use and an appeals court upheld the ruling, have been based on both the Navy’s previous lack of comprehensive environmental analysis, and on the standing of the California Coastal Commission to impose its own restrictions beyond those imposed by the federal National Marine Fisheries Service. The DEIS continues to make the case that the Navy’s existing operational procedures, developed in consort with NMFS, provide adequate protection to marine life; California state officials and laywers told the press that they are likely to challenge the final EIS if additional safety measures are not added.  Read the rest of this entry »

Navy Looks to Supreme Court for Sonar Relief – The US Navy has, as widely expected, asked the Supreme Court to review a decision by a Federal Appeals Court that upheld a lower court ruling imposing a larger buffer zone and other additional operational restrictions on its sonar training in southern California. The Justice Department petition argues that the restrictions jeopardize the Navy’s ability to train sailors and Marines for service in wartime, and could possibly prevent certification of some naval strike groups preparing to deploy to the Persian Gulf. The agency also contends that national security interests can trump those of marine mammals, and that its use of mid-frequency sonar in training exercises hasn’t caused any documented harm to dolphins or beaked whales in the waters where they’re conducted. “We believe that this is an issue that is absolutely essential to national security and that a Supreme Court review of this case is warranted,” said Cmdr. Jeff Davis, a Navy spokesman.  Read the rest of this entry »

California Appeals Court Hands Navy Sonar Setback; Supreme Court May be Next – The 9th U.S. Circuit Court of Appeals on Friday night rejected the Navy’s appeal of restrictions that banned high-powered sonar within 12 nautical miles of the coast and set other limits that could affect Navy training exercises to begin this month. One of the key measures upheld by the court was the maintenance of a 2200-yard safety zone, with sonar being shut down if a whale enters that radius; the Navy called for a 200-yard shut-down zone, with power-reductions starting only when a whale came within 1000 yards. Read the rest of this entry »

Hawaii Court Adds Restrictions to Navy Sonar Training – A Federal District Court in Hawaii has issued a preliminary injunction forcing the Navy to use additional safety measures during routine mid-frequency sonar training in Hawaii waters; Judge David Ezra will hold another hearing in April to consider long-term measures. The restrictions are slightly less strict than those imposed by a different District Court in California: Ezra increased the safety zone in which sonar must be powered down by 6db, from the Navy’s 1000m to 1500m, and sonar must be shut down if a whale is within 500, rather than 200m as they Navy planned.  Read the rest of this entry »

Public Hearings Scheduled on Supplement to Draft EIS – The Navy has released a supplement to its Draft EIS for the Hawaii Range Complex, and is holding public hearings in March to collect public comments on the new aspects. Plans still hold to release the final EIS this spring, and a Record of Decision before the summer RIMPAC exercises. The supplement addresses several areas: fine-tuning of the methodology used to assess behavioral responses to sonar sounds, a lower estimate of total sonar use, and a new preferred alternative in which future sonar use will not increase over current levels, while other training is expanded as planned.Source: Hawaii Reporter/Pacific Fleet Press Release, 2/23/08 [READ PRESS RELEASE]

Dolpin Strands on Navy Island at End of Recent Sonar Exercises – A single deep-water Northern right whale dolphin was found live-beached on San Nicolas Island on January 29, during a heavily scrutinized Naval training exercise. Navy personnel returned it to the water several times, but it did not survive. Curators at the Santa Barbara Museum of Natural History worked all night to perform a necropsy because clues are lost to rapid decomposition. The head was removed and refrigerated, then taken to the nearby Alamo Pintado Equine Medical Center for magnetic resonance imaging. “At this point, we cannot rule in or rule out sonar or any other kind of intense noise,” said Teri Rowles,  Read the rest of this entry »

Federal Judge Rejects White House Exemptions for CA Sonar (updated 2/19)– The federal judge who imposed additional safety requirements on Naval mid-frequency active sonar training off the California coast has rejected the Bush administration’s attempt to exempt the Navy from the laws she was enforcing. Central to this ruling is the fact that there is no “emergency” that warrents such intervention by the White House; the training missions at issue have been long planned, and can proceed, albeit with larger safety buffers and some geographic restrictions to avoid areas with higher numbers of whales.

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Court Forces Navy to Meet With NRDC to Limit LFAS Deployment, Again – In August, the Navy received a 5-year permit to operate its Low-Frequency Active Sonar system on two ships, nearly anywhere in the world, after several years during which its deployment was limited to a remote area of the West Pacific. This week, the same Federal Judge who ordered the earlier reduction in deployment issued a temporary restraining order calling on the Navy to keep its LFAS signals out of several sensitive marine areas worldwide, and to once again sit down with the NRDC and its allies to hammer out a mutually agreeable set of restrictions for the coming five years.  Read the rest of this entry »

Controlled Exposure Study Examines Beaked Whale Responses to Noise – A multi-year research program based at a Navy facility in the Bahamas is using hydrophones installed on the seafloor, along with suction-attached tags that record the sound heard by tagged whales to learn more about how dive patterns are changed when whales hear mid-frequency sonar signals. The Woods Hole periodical Oceanus featured a detailed article on this work, including pictures. Oceanus, 1/15/07 [READ ARTICLE] See also AEI’s lay summary of the cruise report from their first field season[GO THERE]

Initial Cruise Report From First Controlled Exposure Studies of Beaked WhalesIan Boyd, Diane Claridge, Christopher Clark, Brandon Southall, Peter Tyack. Behavioral Response Study-2007, Cruise Report, Phase 1    A summary of the project, and the preliminary cruise report are available: [WEBSITE]During August and September, 2007, the first controlled exposure experiments aimed at learning more about the ways that beaked and pilot whales respond to exposure to mid-frequency active sonar took place in the Bahamas.  Read the rest of this entry »

Extended Near-surface Dives May Be Cause of Beaked Whale BendsWalter, M.X. Simmer, Peter L. Tyack. Repetitive shallow dives pose decompression risk in deep-diving beaked whales. Marine Mammal Science, Volume 23 Issue 4 Page 888-925, October 2007.  ScienceNow summary of paper: [WEBSITE]It is apparent that beaked whales are especially sensitive to mid-frequency sonar, but the reasons have remained elusive. This study explores a new idea about how the whales’ dive patterns may be disrupted enough to cause decompression sickness (DCS, ie “the bends”). Some have suspected that exposure to sonar may cause the whales to surface more quickly than usual, but since the whales’ lungs are collapsed in dives deeper than 70m (thus preventing nitrogen from entering the bloodstream and infiltrating into tissues where it could cause damage), it is not readily apparent how faster surfacing would cause DCS. Instead, this study looks at the “recovery” period observed in beaked whales, during which they make a series of near-surface dives before embarking on a new deep foraging dive. The researchers modeled the possible physiological effects of having this recovery period extended longer than usual. The team incorporated known physiological data into a model that charts how the bubble size might increase in the circulatory system, brain, muscles, and fat tissues when a whale dives repeatedly to between 30 and 80 meters for as long as 3 hours. The team’s model predicts that if the whales’ lungs do not collapse during a long series of shallow dives, the increased pressure can cause nitrogen bubbles to diffuse into tissues, increasing the risk of bubble formation on ascent. Such behavior may result if the whales perceive sonar transmissions as a predator:  Read the rest of this entry »

Low Frequency Active Sonar Shows Less Impact on Fish than Airguns  

Popper, Halvorsen, Kane, Miller, Smith, Song, Stein, Wysocki. The effects of high-intensity, low-frequency active sonar on rainbow trout. J. Acoust. Soc. Am. 122 1 , July 2007. p. 623-635.

This study extended a previous line of research that had measured physiological impacts of seismic survey air guns on fish kept confined in a cage and exposed to the noise. This time, the research team exposed trout (which share hearing mechanisms with salmon, which are of special concern due to their endangered status) to sounds produced by low-frequency active sonar. LFA sonar uses frequencies (100-500Hz) that many fish can detect, often the range of most sensitive hearing. Fish were tested for hearing sensitivity using Auditory Brainstem Response (ABR), and some were sacrificed to check for physiological damage, including swim bladder or ear hair damage. Results indicate that fish had reduced hearing sensitivity after exposure to LFA sonar, ranging from 17-25dB at particular frequencies (i.e., sounds needed to be that much louder in order to be heard), and that the effects lasted at least 48 hours (the longest followup the study included). 

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