A new study funded by the U.S. navy and the Office of Naval Research show that Beaked whales are at higher risk of developing decompression sickness since they live with extremely high levels of nitrogen in their blood and body tissues. This may explain why beaked whales seem to be especially susceptible to naval sonar. If the sonar causes the animals to surface more rapidly than they would normally do, e.g. because they are frightened by the underwater sounds, it may lead to decompression sickness which may in turn explain the strandings associated with naval sonar exercises.

Decompression sickness, commonly referred to as “the bends” among scuba divers, is a consequence of the sudden drop in pressure that occurs when you ascend rapidly from the deep. When mammals dive, nitrogen builds in our bodies. If we ascend slowly the nitrogen isn’t dangerous, but if we ascend too quickly the nitrogen forms bubbles inside the body. Tiny bubbles might not sound like anything to fuzz about, but within the body it can be lethal.

Beaked whales are believed to accumulate large amounts of nitrogen within their bodies since they make repeated dives to such great depths. They can stay submerged without breathing for long periods of time and are capable of descending down to nearly 1,500 metres. Having this inclination for decompression sickness may explain why beaked whales seem to be more vulnerable to naval sonar than other marine mammals.

“It provides more evidence that beaked whales that are being found dead in association with naval sonar activities are likely to be getting decompression sickness,” said Robin Baird, a marine biologist at Cascadia Research Collective and one of the report’s authors.

The study has focused on three species of beaked whale: Cuvier’s beaked whale (Ziphius cavirostris), Blainville’s beaked whale (Mesoplodon densirostris), and the Northern bottlenose whale (Hyperoodon ampullatus). The Northern bottlenose whale was studied off the cost of Nova Scotia, Canada while the two others were observed around Hawaii, U.S.

According to a 2006 report in the Journal of Cetacean Research and Management, 41 known cases of mass strandings of Cuvier’s beaked whales have occurred since 1960. Some of them have happened at the same time as naval sonar exercises in the area, including Greece in 1996, the Bahamas in 2000, and the Canary Islands in 2002. When the beaked whales stranded in Bahamas were autopsied, they turned out to have bleedings around their brains and ears; bleedings which may have been caused by nitrogen bubbles.

The U.S. navy has agreed to adopt certain practises to protect whales, but is resisting more stringent restrictions until more scientific evidence is at hand. The navy has budgeted 26 million US per year over the next five years to fund marine mammal research on how these animals are affected by sound.

If you wish to find out more about the beaked whale study, it is published online this week in the journal Respiratory Physiology and Neurobiology.

The 2009 whaling season has now started in the waters off Iceland.

Iceland and Norway are the only two countries that openly defy the international whaling moratorium; Japan is instead using a loop whole, claiming their whaling to be carried out for scientific purposes.

Former Icelandic fisheries minister Steingrimur Sigfusson said in February that Iceland would make no changes to its whaling quotas of 150 Fin whales and up to 150 Minke whales per year.

“The first batch of meat will be in stores by the weekend,” says Gunnar Bergmann Jonsson, manager of the Minke Whaler Association. He said 50 to 60 per cent of the meat will be sold domestically, while the rest is sold to Japan.

The first whales are usually killed in a bay outside Reykjavik, since whaling is prohibited close to the harbour. The prohibition has been imposed to prevent whalers from disturbing whale watchers, since that may cause damage to the Icelandic whale watching business.

The Icelandic whaling season usually runs from May to late September.

Whale facts
Also known as Little Piked Whales or Lesser Rorquals, Mink Whales prefer icy waters but are found world-wide. Once perceived as one single species, the population has quite recently been recognized as consisting of two distinct species: the Northern Mink Whale, Balaenoptera acutorostrata, and the Southern Mink Whale, Balaenoptera bonaerensis. Together, the two species are believed to form a population of over 1 million Minke Whales world-wide. Balaenoptera acutorostrata is listed as Least Concern on the IUCN Red List of Threatened Species, while Balaenoptera bonaerensi is listed as Data Deficient since it was recognized as a separate species so recently.

The Fin Whale (Balaenoptera physalus) is also found world-wide, with 40,000-56,000 specimens living in the North Atlantic. Unlike the Mink Whale, the Fin Whale is listed as Endangered on the IUCN Red List of Threatened Species.

Photograph created by Erik Christensen. Taken on the Faroe island not Island.

A group of conservationists and scientists are planning a research trip to the world’s largest rubbish pile; the Great Pacific Garbage Patch. Also known as the Eastern Garbage Patch, the Pacific Trash Vortex, or simply the Great Plastic Vortex; this gyre of marine litter has been gradually building over the last 60 years but we still know very little of this man-made monstrosity.

The expedition, headed by Hong Kong based entrepreneur and conservationist Doug Woodring, hopes to learn more about the nature of the vortex and investigate if it is possible to fish out the debris without causing even more harm.

“It will take many years to understand and fix the problem,” says Jim Dufour, a senior engineer at Scripps Institution of Oceanography in California, who is advising the trip.

According to Dufour, research expeditions like this one are of imperative importance since establishing the extent of the problem is vital for the future health of the oceans.

“It [the expedition] will be the first scientific endeavour studying sea surface pollutants, impact to organisms at intermediate depths, bottom sediments, and the impacts to organisms caused by the leaching of chemical constituents in discarded plastic,” he says.

The research crew, which will pass through the gyre twice on their 50-day journey from San Francisco to Hawaii and back, are using a 150-foot-tall (45-metre-tall) ship – the Kaisei, which is Japanese for Ocean Planet. They will also be accompanied by a fishing trawler responsible for testing various methods of catching the garbage without causing too much harm to marine life.

“You have to have netting that is small enough to catch a lot but big enough to let plankton go through it,” Woodring explains.

Last year, building contractor and scuba dive instructor Richard Owen formed the Environmental Cleanup Coalition (ECC) to address the issue of the pollution of the North Pacific. A plan designed by the coalition suggests modifying a fleet of ships to clear the area of debris and form a restoration and recycling laboratory called Gyre Island.

Hopefully, the garbage can not only be fished up but also recycled or used to create fuel, but a long term solution must naturally involve preventing the garbage from ending up there in the first place.

”The real fix is back on land. We need to provide the means, globally, to care for our disposable waste,” says Dufour.

Despite being sponsored by the water company Brita and backed by the United Nations Environment Programme, the expedition is still looking for more funding to meet its two million US dollar budget. Since the enormous trash pile is located in international waters, no single government feels responsible for cleaning it up or funding research. Another problem is lack of awareness; since very few people ever even come close to this remote part of the ocean it is difficult to make the problem a high priority issue. A documentary will be filmed during the expedition in hope of making the public more aware of where the world’s largest garbage dump is actually located.

What is the Eastern Garbage Patch?

According to data from the United Nations Environment Programme, our oceans contain roughly 13,000 pieces of plastic litter per square kilometre of sea. However, this trash is not evenly spread throughout the marine environment – spiralling ocean currents located in five different parts of the world are continuously sucking in vast amounts of litter and trapping it there. Of these five different gyres, the most littered one is located in the North Pacific – the Eastern Garbage Patch.

The five major oceanic gyres.

The existence of the Eastern Garbage Patch was first predicted in a 1988 paper published by the National Oceanic and Atmospheric Administration (NOAA) of the United States. NOAA based their prediction on data obtained from Alaskan research carried out in the mid 1980s; research which unveiled high concentrations of marine debris accumulating in regions governed by particular patterns of ocean currents. Using information from the Sea of Japan, the researchers postulated that trash accumulations would occur in other similar parts of the Pacific Ocean where prevailing currents were favourable to the formation of comparatively stable bodies of water. They specifically indicated the North Pacific Gyre.

California-based sea captain and ocean researcher Charles Moore confirmed the existence of a garbage patch in the North Pacific after returning home through the North Pacific Gyre after competing in the Transpac sailing race. Moore contacted oceanographer Curtis Ebbesmeyer who dubbed the region “the Eastern Garbage Patch” (EGP).

Twice the size of Texas

The Eastern Garbage Patch is located roughly 135° to 155°W and 35° to 42°N between Hawaii and mainland USA and is estimated to have grown to twice the size of Texas, even though no one knows for sure exactly how large the littered area really is. The garbage patch consists mainly of suspended plastic products that, after spending a long time in the ocean being broken down by the sun’s rays, have disintegrated into fragments so miniscule that most of the patch cannot be detected using satellite imaging.

Impact on wild-life and humans

The plastic soup resembles a congregation of zooplankton and is therefore devoured by animals that feed on zooplankton, such as jellyfish. The plastics will then commence their journey through the food chain until they end up in the stomachs of larger animals, such as sea turtles and marine birds. When ingested, plastic fragments can choke the unfortunate animal or block its digestive tract.

Plastics are not only dangerous in themselves, they are also known to absorb pollutants from the water, including DDT, PCB and PAHs, which can lead to acute poisoning or disrupt the hormonal system of animals that ingest them. This is naturally bad news for anyone who likes to eat marine fish and other types of sea food.

The Snubfin dolphin (Orcaella heinsohni), recognized as a species as recently as 2005, have been spotted while utilizing a rare hunting technique previously only noted in the Irrawaddy dolphin (Orcaella brevirostris), a close relative of the Snubfin.

The unusual group hunting technique involves chasing the prey fish to the surface of the ocean and rounding them up by spitting jets of water at them. Once the fish is packed together in a reasonably small “cylinder”, the dolphins move in to devour them.

According to WWF Australia’s marine and coasts manager Lydia Gibson, the behaviour was first noticed in Australia off the Kimberley Coast.

We still know very little about the Snubfin dolphin, which lives along Australia’s northern coast in a number of locations off the Queensland and Northern Territory coasts, as well as the Kimberley region of Western Australia. It is listed as Near Threatened on the IUCN Red List of Threatened Species, chiefly due to habitat destruction. Since Snubfin dolphins live close to shore, they are also more likely to end up in gill nets and drown compared to more pelagic species of dolphin.

Researchers at Woods Hole Oceanographic Institution (WHOI) unveiled a hazardous cocktail of pesticides when analysing the brain matter of 12 marine mammals; eleven cetaceans and one gray seal stranded near Cape Cod, Massachusetts.

This is the most extensive study of pollutants in marine mammals’ brains and it confirms suspicions of marine mammals being the carrier of a vast array of different chemicals that have found their way into marine ecosystems.

Lead author Eric Montie analyzed the cerebrospinal fluid and the gray matter of the cerebellum in the twelve animals and found them to contain a long row of different man-made chemicals, including a group of especially widespread substances labelled “the dirty dozen” by environmentalists. Many countries banned the “the dirty dozen” as early as the 1970s due to their adverse effect on human health, but they are unfortunately still present in our environment.

Montie didn’t just test for the presence of certain chemicals; he also measured their concentration and found one instance where it was surprisingly high.

“The biggest wakeup was that we found parts per million concentrations of hydroxylated PCBs in the cerebrospinal fluid of a gray seal”, says Montie. “That is so worrisome for me. You rarely find parts per million levels of anything in the brain.”

PCBs are neurotoxicants known to disrupt the thyroid hormone system. Other examples chemicals found in the tested mammals are DDT (diklorodifenyltriklorethane), which can cause cancer and disturb reproduction, and PBDEs (polybrominated diphenyl ethers); a type of flame retardants known to impair the development of motor activity and cognition.

Co-author Chris Reddy, a senior scientist in the WHOI Marine Chemistry and Geochemistry Department, describes the new study as “groundbreaking because Eric measures a variety of different chemicals in animal tissues that had not been previously explored. It gives us greater insight into how these chemicals may behave in marine mammals.”

The results of this study was published online April 17 in Environmental Pollution.

As reported earlier , the European Union has decided to ban the import of seal skin and other seal products hailing from commercial seal hunting.

This has upset Canadian seal hunters since Italy and Denmark, both members of the European Union, are two major importers of seal products. Italy imports most of their seal skins from Russia, but Denmark has always been an important trade partner for North American seal hunters, partly due to Denmark’s traditional connection to Greenland.

According to a statement from Canadian Trade Minister Stockwell Day, the federal government is now getting ready to move in with an appeal against the ban, which they see as a clear breach of WTO regulation.

“We’ll go to the WTO because it’s clear in WTO regulations that if one country wants to ban the products of another, it has to have clear scientific, medically acceptable reasons for doing so, and this EU ban is not based on hard science,” Day said.

The Canadin government believes that Canada deserves an exemption from the import ban since it follows internationally accepted guidelines regarding seal hunting, e.g. by prohibiting the clubbing of baby seals while they still have their white coats.

Day claims that the European ban is based on “people’s feelings” rather than hard facts, and says that the trade action will proceed unless the European Union Parliament exempts Canada and other countries that he said practise humane and sustainable seal hunting. According to Day, seal hunt proponents erroneously portray seal hunting as it was 40 years ago.

The suggested seal import ban must still be approved by individual European governments before becoming law but can, if passed, come into effect as early as next year. If the is approved, it will cause an annual 2 million USD loss for the Canadian industry.

Canadian Fisheries Minister Gail Shea agrees supports the government’s planned trade action.

“When you live in small coastal communities, sometimes there’s not many opportunities to make some additional money,” she said. “We have a number of families who make up to 35% of their annual income from the seal hunt. So yes, I do think it’s very important.”

As reported earlier, the proposed European seal import ban will contain some exemptions and seal products resulting from hunts traditionally conducted by Inuit and other indigenous communities can still be imported to and marketed in European Union countries even if the ban is approved. Products that result from hunting conducted for the purpose of sustainable management of marine resources on a non-profit basis will also be allowed, and individual travellers will be permitted to bring seal products to the European Union as long as the import is of an occasional nature and consists exclusively of goods for the personal use of the traveller.

Yesterday, the European Parliament voted to ban most seal products from the European market. The legislative resolution was adopted with 550 votes in favour, 49 against and 41 abstentions.

Suggestions from the European Parliament’s will only become law if adopted by the European Council of Ministers, which represents the member states. The legislative report on the seal products ban was agreed with the European Council of Ministers in first-reading.

An exemption is allowed for indigenous communities so seal products resulting from hunts traditionally conducted by Inuit and other indigenous communities can still be imported to and marketed in European Union countries.

“This deal will protect seals from cruelty and protect the Inuit people’s traditional way of life,” said Christel Schaldemose, a Danish Socialist MEP.

Import of seal products will also be permitted where it is of an occasional nature and consists exclusively of goods for the personal use of the traveller or products that result from by-products of hunting conducted for the purpose of sustainable management of marine resources on a non-profit basis.

The legislative report was drafted by UK MEP Diana Wallis of the Alliance for Liberals and Democrats in Europe (ALDE). ALDE is the third largest political group in the European Parliament.

No ban on hunting

“Seals are very beautiful marine animals, in fact, I have realized during this process that they have great PR, but to some they are the rats of the sea”, Wallis said in the debate yesterday.

“That is how they are perceived by many fishermen – an adult seal gets through an enormous amount of fish on a daily basis. Therefore, there will remain the need for seals to be hunted to ensure the sustainability of fisheries in some area.“

“But what we have not done here is to regulate hunting,” said Wallis. “If people in any of our

member states wish to hunt, they can still continue to hunt. What they cannot do is take commercial gain from the results of that hunt. But it should be the case that the results of the hunt can be used, and I hope particularly that those parts of seals that can be used by the medical community will be able to be used.”

Today, human heart valves can be replaced with bioprosthetic valves from seals and other marine mammals.

“Great progress has been made in the survival and quality of life of cardiac patients by using the aortic, pulmonary and pericardial tissue of harp seals, the assumption being that they are sustainably hunted or killed and not in a cruel way,” said Irish MEP Avril Doyle of the Group of the European People’s Party (Christian Democrats) and European Democrats, EPP-ED. “I would like assurances on ongoing medical research and bioprosthetic use of products from seals in the context of the compromise,” she added.

The patent holder for the valve replacement process, Efstathios Andreas Agathos of Massachusetts, says the needed seal valves can be supplied by “the annual seal harvesting supported by Canadian government for population control.”

Canada will challenge ban at WTO

Canada‘s Trade Minister Stockwell Day said that Canada will challenge the trade ban at the World Trade Organization, unless an exemption is added for any country that has strict guidelines in place for humane and sustainable sealing practices.

“The decision by the European Parliament lacks any basis in facts,” said Canadian Fisheries and Oceans Minister Gail Shea. “The Canadian seal hunt is guided by rigorous animal welfare principles which are internationally recognized by independent observers. I once again caution my European counterparts about the dangers of pursuing politically motivated bans on other countries’ traditional industries. Our government will stand up for the jobs and communities that depend on the seal hunt.”

The world’s largest seal hunt is conducted every spring off Canada’s Atlantic coast and Denmark, one of the main importers of raw fur sealskins to the European Union, imports seal skins directly from Canada and Greenland. Denmark and Italy are by far the two largest importers of raw fur sealskins for the EU market. Unlike Denmark, Italy imports most skins from Russia, and from the two EU members Finland and Scotland (UK). Greece will also be affected by the trade ban, but not to the same extent as Denmark and Italy since the Greece trade in raw seal skins – predominately from Finland and Scotland – is much smaller.