Weird underwater discoveries such as an egg-eating Australian sea serpent and a strikingly coloured worm named after Star Wars‘ Yoda could carry on for decades to come, with new research estimating that up to one third of species remain undiscovered.
A study co-led by a University of Auckland expert and published today in international journal Current Biology calculated there were fewer than one million marine species on the planet, lower than some previous estimates. The number undiscovered likely amounts to a third of all species.
Hot spots for new finds included deep sea ecosystems and those in tropical areas, said Associate Professor Mark Costello from the University of Auckland, who co-led the research with Ward Appeltans of Flanders Marine Institute and the Intergovernmental Oceanographic Commission of Unesco.
“If we look at the number of undescribed species and samples from around the world, especially deep sea and tropical areas, the average over 100 studies was that about 30 per cent of those new species were new to science,” he told the Herald.
Easier identification, better technology and more scientists would boost the rate of discovery.
“It’s likely it will get harder and harder to find the rarer things, but it also gets more exciting.”
Bizarre species discovered within the past year included Yoda purpurata, which had features resembling the Jedi master’s large sagging ears, a crimson shrimp found at a depth of 2600m beneath the Norwegian Sea, and an odd-looking bristle worm discovered 1600m below the northeast Pacific.
“Knowing how many species there are in our oceans, and describing them, is vital for science and conservation for several reasons,” Professor Costello said.
“Species are the most practical measure for distinguishing habitats and tracking progress in exploring the earth’s biodiversity.
“They are as fundamental to biology as elements are to chemistry and particles to physics.
“So failure to consider all species in an ecosystem is analogous to an accountant ignoring items of inventory in a company’s stock.”
Better understanding of what species exist enabled more accurate estimates of extinction rates through habitat loss, while having a “master list” of species’ names was essential for quality assurance.
Research efforts have been boosted by the World Register of Marine Species - an open-access, online database that has received contributions from almost 300 scientists from 32 countries.
The study supports previous research by Professor Costello and colleagues, which used statistical modelling and an earlier version of the register to reach a similar estimate of the number of species on earth and in the oceans. It is also the culmination of 14 years’ work for Professor Costello, who began a European register of marine species in 1997 that expanded until the world register was initiated in 2006.
OCEANS STILL TO GIVE UP THEIR INHABITANTS
Around 226,000 species have been described by science and as many as 72,000 more are in collections awaiting description - yet hundreds of thousands more may still be waiting for discovery in our oceans.
The rate of discovery is, however, increasing, with an unprecedented 20,000 new marine species described in the past decade alone, suggesting that most marine species will be discovered this century.
Earlier estimates of ocean diversity had relied on expert polls based on extrapolations from past rates of species descriptions and other measures.
Those estimates varied widely, suffering because there was no global catalogue of marine species, and a new study gauging a more accurate figure canvassed 120 of the world’s top experts on the taxonomy, or classification, of marine species.
Mammals, birds, reptiles, insects and larger plants were some of the best-described groups of marine species to date.
Many of the species yet to be discovered will come from among the smaller crustaceans, molluscs, algae, worms, and sponges.
In Canada’s Fraser River, a mysterious illness has killed millions of Pacific salmon, and scientists have a new hypothesis about why: The wild salmon are suffering from viral infections similar to those linked to some forms of leukemia and lymphoma.
For 60 years before the early 1990s, an average of nearly 8 million wild salmon returned from the Pacific Ocean to the Fraser River each year to spawn.
Now the salmon industry is in a state of collapse, with mortality rates ranging from 40 percent to 95 percent.
The salmon run has been highly variable: The worst year came in 2009, with 1.5 million salmon, followed by the best year in 2010, with 30 million salmon. But the overall trend is downward.
Losses were particularly high in elevated river temperatures; warmer water makes it more difficult to deliver oxygen to the tissues of salmon.
Seven of the last 10 summers have been the hottest on record for the Fraser River. But experts say it’s too soon to pin the blame on global warming.
“Clearly, a warming climate is going to produce some new stresses for Pacific salmon,” said Daniel Schindler, a professor of aquatic and fishery sciences at the University of Washington in Seattle. “Some of those stresses will certainly be expressed through increased susceptibility to disease, including something like this.”
But he added: “The reality is we have very poor understanding of how climate and disease dynamics interact with each other in salmon. We know they’re going to be important, but we can’t say a lot in detail.”
Two years ago, Canada’s prime minister ordered a judicial inquiry - known as the Cohen Commission - to investigate the salmon deaths, with a final report due by June 2012.
Scott Hinch, an investigator at the University of British Columbia’s Pacific salmon ecology and conservation lab and a co-author of a study on the salmon that was published in the journal Science, testified before the panel last month. He told it that the virus could be the biggest factor that’s driving the collapse.
The study raises “a big red flag,” providing scientists with a possible new explanation, said Brian Riddle, the president and chief executive officer of the Pacific Salmon Foundation in Vancouver, British Columbia.
“The critical thing is that for years, people have wondered about the rate of decline and how it can be pretty consistent across most populations in the Fraser,” he said. “This provides a viable reason now. We’re discovering something new. There’s still a lot unknown. We don’t understand the origin of the virus. We don’t understand how it functions.”
He said much more study was needed.
“If this really is a virus and it’s something we don’t understand, then we don’t know how to treat it or control for it,” Riddle said. “So this is something that could linger with us for a long time, and possibly until the animal learns how to deal with it. That will only happen through natural selection-type processes.”
As part of Hinch’s study, salmon were caught, tagged and implanted with radio transmitters and their blood, gill, muscle and fin tissues were biopsied. Scientists then tracked them and discovered that many were stressed and sick before they reached their spawning grounds.
According to the study, ocean-tagged salmon that had the gene signature associated with the viral infection were 13.5 times more likely to die before spawning.
Hinch said the scientists thought that the salmon became infected at sea, before making their runs upriver. He likened it to “dead fish swimming.”
If researchers can confirm the findings that a virus related to leukemia is responsible, “it would be quite novel,” said Hinch.
While there’s no similar research taking place in the United States, Schindler of the University of Washington said there was no reason not to assume that salmon in the nearby Columbia River in Washington state would be suffering, as well.
Glen Spain, the Northwest regional director of the Pacific Coast Federation of Fishermen’s Associations, said other issues were at play and that “a cascade of interrelated factors,” not just a virus, could be causing the salmon deaths.
“There are fundamental habitat issues that weaken the salmon when they have too little water in the river or when the water is poor quality, when the population is truncated because of dams and there’s less biological diversity,” he said. “All of those are risk factors for any number of diseases. … It’s sort of like the blind man and the elephant. Everybody thinks that what they’ve got in front of them is the elephant. The reality is that it’s a whole ecosystem.”
He added: “If this is a virus, it’s an endemic virus and it’s been out there for thousands of years. The question is, if it’s attacking fish now, why now?”
Newswise — It has been one year since a massive explosion on board BP’s Deepwater Horizon rig spilled millions of gallons of crude oil into the Gulf of Mexico. The disaster claimed 11 lives and became the largest oil spill in U.S. history. Damage was catastrophic along the Gulf Coast states. Oil and tar balls washed ashore, fouling beaches and estuaries. Marine organisms, seen and unseen below the surface, were sickened and killed in droves.
But on this infamous anniversary, some positive news can still be reported. The oil spill caused BP to provide millions of dollars to fund scientific research to gather basic information and determine the long-term impact of the spill. In doing so, scientists throughout Florida are unlocking the mysteries of the deep. Advancing oceanographic research will ultimately be the positive legacy of the spill among the negative ones.
BP provided a $10 million block grant to the Florida Institute of Oceanography (FIO) to fund researchers across the state to conduct projects that analyze the spill’s impact and address baseline parameters relating to the spill. All told, 27 projects were chosen. These projects ranged from measuring the chemical composition and breakdown of oil hydrocarbons and dispersants, to the behavior of the fish, plankton, and various deepwater invertebrates possibly exposed to oil.
Nova Southeastern University researchers are using BP money to collaborate with their colleagues at Florida International University and Florida Atlantic University to study sponge species near the spill site to examine possible clues about how marine invertebrates and microbes cope with chemical pollutants. Sponges are an ancient ancestor of most living animals, having fossils that are over 500 million years old. Modern molecular genetics methods are being applied to reveal the hidden biology of marine sponges and develop them as potential sentinels (bio-indicators) to detect massive or subtle environmental changes. This study will apply sophisticated DNA sequencing and microbial analyses to better understand these marine organisms’ biology.
A better understanding of marine processes and resilience to events like oil spills will be gained through unbiased scientific research. Other benefits will be developing safer ways to drill and develop natural resources, new protocols to study and protect the biological diversity of marine life living near the top and bottom of the ocean, and a greater realization for what we still do not know about the vast oceans. Moreover, there may be a greater appreciation for the bountiful products, nutrition and employment that the oceans provide society in general. All of these are positive results from the Deepwater Horizon tragedy.
The FIO research projects should be seen as one way to decrease marine mysteries, illuminating the depths of our ignorance by gaining knowledge of dark marine habitats and shy marine organisms that live in our oceans. More research into the planet’s largest natural habitat, the ocean, is needed. Unfortunately, funding limitations and a deep economic recession have adversely affected NOAA’s (National Oceanic and Atmospheric Administration) ability to fund researchers and academic institutions like NSU that conduct oceanographic research.
As tragic as the oil spill was, it did present us more funding opportunities from private enterprise. Private funding can fill in for decreased public support. The BP oil spill caused monumental environmental damage, but indirectly helped advance marine research. The more knowledge we gain about the oceans, the more we can help to protect them for future generations to enjoy.
Jose Lopez, Ph.D., is an associate professor at NSU’s Oceanographic Center, who is using a BP block grant to measure the oil spill’s impact on marine sponge and symbiotic microbial communities.
Global warming took a toll on coral reefs in 2010, endangering one of the world’s key ecosystems that benefit people in countless ways.
Coral reefs are habitat for almost 100,000 known marine species, including about 40 percent of all fish species. They feed millions of people, protect coasts by absorbing wave energy, and shelter creatures that could become sources of medicine for treating cancer, HIV/AIDS and other diseases.
National Oceanic and Atmospheric Administration satellite data show that 2010, the warmest on record, was hard on corals. Warmer than normal temperatures stressed tropical corals, causing them to bleach - expelling the algae that live in their tissue, giving them color and nourishment.
Some 75 percent of the world’s reefs are threatened by climate change, overfishing and pollution, according to a new assessment from the World Resources Institute and other conservation organizations. The number increased dramatically from the group’s last assessment in 1998.
“It will take a Herculean effort to reverse the current trajectory and leave healthy ocean ecosystems to our children and grandchildren,” said Jane Lubchenco, the marine scientist who heads NOAA. “How the world rises to this challenge is a reflection of our commitment to one another and to the natural world that gives us sustenance, wisdom and a reflection of our souls.”
Coral reefs cover less than a tenth of 1 percent of the oceans’ acreage, but that’s still about 100,000 square miles. Scientists who dive to study reefs can’t cover them all, so they’re turning increasingly for help from satellites.
NOAA’s satellite data on ocean heat showed that bleaching is occurring in all regions and becoming more frequent. Extreme bleaching kills corals because they can’t survive without the nourishment the algae provide. Less intense bleaching can weaken corals, reduce their growth and reproductive ability, and make them more vulnerable to disease.
Mark Eakin, a University of Miami-trained oceanographer who coordinates NOAA’s Coral Reef Watch satellite program, said that 2010 was only the second time on record that bleaching occurred globally.
The first global bleaching, from 1997 to 1999, came when an exceedingly strong El Nino - a periodic warming of ocean surface temperatures in the tropical Pacific - was followed by an especially strong version of its opposite counterpart, La Nina. About 15 percent of the world’s corals died then.
“Fast forward to 2010,” Eakin said. This time, El Nino and the La Nina that followed weren’t nearly as strong.
“The problem that we’re seeing is, as the oceans keep warming on a year-to-year basis, it doesn’t take as big or as unusual conditions to result in this sort of event.”
The bleaching from last year in many places was the worst since 1998. In the warmest months, bleaching hit the Pacific, the Indian Ocean, Southeast Asia and the southern Caribbean.
The Florida Keys and the northern part of the Caribbean, where unprecedented bleaching occurred in 2005, were spared last year because tropical storms cooled the waters.
Coral reefs are more diverse in life forms than even rain forests. The most abundant life is in the Coral Triangle, from the Philippines down to Indonesia and across to Papua New Guinea.
“I’ve been diving in some places there where I see more species on any given reef than we have in all of the Caribbean,” Eakin said.
Corals that inhabit warm ocean areas are spreading northward in Japan’s coastal waters, apparently due to global warming, researchers have announced.
According to a research team from the National Institute for Environmental Studies in Ibaraki Prefecture and the Kushimoto Marine Park Center in Wakayama Prefecture, the northern limits of the habitats of several species of coral lying mostly near the Nansei Islands south of Kyushu have been moving northward at a “unprecedented speed” of up to 14 kilometers per year.
The unusual phenomenon is thought to have been caused by rising sea temperatures associated with global warming. As corals serve as the home for various marine plants and animals, researchers fear a possible change in the regional ecosystem.
In the sea around Japan, average water temperatures in winter have risen by 1.1 to 1.6 degrees Celsius over the past century. Out of nine species of corals that the research team analyzed, four that live in tropical waters have so far spread northward. One of the four species was observed inhabiting the area near Kagoshima Prefecture’s Tanegashima island in 1988, but was found to have spread 280 kilometers northward to Nagasaki Prefecture’s Goto Islands 20 years later.
FT. LAUDERDALE, Fla. — With the New Year comes new challenges to fish in our world’s oceans and one of the major concerns is the expansion of hypoxic zones. That’s the scientific name but more recreational anglers are becoming aware of them as “dead zones.”
They are areas in the oceans with low or non-existent oxygen levels which, according to a recently released research study by scientists and fish management experts, are increasing in size while decreasing the habitats of billfish and tuna. In scientific circles this phenomena is called “habitat compression.”
Ellen Peel, president of The Billfish Foundation (TBF) said scientists outfitted 79 sailfish and blue marlin in two strategic areas of the Atlantic with pop-off archival satellite tags which monitored their horizontal and vertical movement patterns.
“Billfish favor abundant habitats of oxygen-rich waters closer to the surface while avoiding waters low in oxygen,” Peel said. The study, composed of scientists from the National Oceanic and Atmospheric Administration (NOAA), the University of Miami Rosenstiel School of Marine and Atmospheric Science, and TBF, found a massive expanding low oxygen zone in the Atlantic Ocean is encroaching upon the fish forcing them into shallower waters where they are more likely to be caught. The research waters included areas off south Florida and the Caribbean (western North Atlantic); and off the coast of West Africa (the eastern tropical Atlantic).
Hypoxic zones occur naturally in areas of the world’s tropical and equatorial seas because of ongoing weather patterns, oceanographic and biological processes. In the current cycle of climate change and accelerated global warming, hypoxic areas are expanding and shoaling closer to the sea surface, and may continue to expand as sea temperatures rise.
“The zone off West Africa,” said Dr. Eric D. Prince, NOAA Fisheries Service research biologist, “encompasses virtually all the equatorial waters in the Atlantic Ocean, is roughly the size of the continental United States and is growing. With the current cycle of climate change and accelerated global warming we expect the size of this zone to increase, further reducing the available habitat for these fishes.”
Oil platform could put critically endangered whales at risk
Sakhalin Energy Investment Company already has two platforms in the area and have previously said that their drilling technology meant that they would not need a third. An official Sakhalin Energy document also acknowledges that having two rather than three platforms “significantly reduces the potential for environmental impact”.
The company plans to conduct a seismic survey which involves shooting loud pulses of noise into the ocean floor later this year to determine where to begin platform construction.
Three seismic surveys conducted around the whale feeding habitat last summer caused severe pressure on the animals as the noise from the surveys can be devastating for species that rely on sound to navigate, communicate and find their food.
Grey whales occur on both sides of the Pacific Ocean. However IUCN classes the critically endangered Western population as separate from the Eastern population, as genetic studies indicate that the two populations probably do not mix.
Only around 130 whales of the critically endangered Western population exist today.
The construction and operation of an additional off-shore platform could have a number of negative effects on the whales, including disrupting feeding behaviours and increasing the chance of fatal ship strikes.
Aleksey Knizhnikov, Oil Gas Environmental Policy Officer for WWF-Russia says on the WWF website: “Just around 30 female western Grey whales of breeding age remain the population is already on the brink of disappearing forever. The loss of even a few breeding females could mean the end for the population.”
During the feeding season the whales must eat enough to maintain themselves for the migration to their breeding grounds. Their primary feeding area, near the proposed platform, is also one of the only places where mother whales can teach their calves to feed on the sea bed.
“We are astonished by the announcement from Sakhalin Energy that it intends to build a third platform,” said Wendy Elliott, Species Programme Manager, WWF-International.
Doug Norlen, Policy Director at Pacific Environment reiterates:”We still do not know how badly the whales were affected by major seismic activity last summer and will not know until the whales return to their feeding grounds again this year and scientists can determine if any are malnourished. It is totally inappropriate for Sakhalin Energy to plan another seismic survey in 2011 before we have the opportunity to examine the health of the animals.”
Article source: http://www.practicalfishkeeping.co.uk/content.php?sid=3561
Oceana, an international ocean conservation group, yesterday released a new report that identifies vital habitats in need of protection, if key endangered species are to have a chance to survive climate change. According to the Intergovernmental Panel on Climate Change (IPCC), 20 to 30 percent of the world’s species will be at increased risk of extinction if global temperature increases exceed 1.5 to 2.5 C (3 to 5 F) above pre-industrial levels. The climate threats to species include increased disease, diminished reproduction, habitat loss, and declining food supply.
For species that are already struggling on the brink of extinction, global climate change threatens to push them over the edge, said Huta. We certainly need to reduce global warming pollution, but we also need to act now to prioritize and protect some of the most important ecosystems for imperiled wildlife. Endangered species don’t have the luxury of waiting for political leaders to act to slow the pace of climate change.
List of top 10 ecosystems to save for endangered species featured in the report:
1. Arctic sea ice, home to the polar bear, Pacific walrus and at least six species of seal
2. Shallow water coral reefs, home to the critically endangered elkhorn and staghorn corals
3. The Hawaiian Islands, home to more than a dozen imperiled birds, and 319 threatened and endangered plants
4. Southwest deserts, home to numerous imperiled plants, fish and mammals
5. The San Francisco Bay-Delta, home to the imperiled Pacific salmon, Swainsons hawk, tiger salamander and Delta smelt
6. California Sierra Mountains, home to 30 native amphibian species, including the Yellow-legged frog
7. The Snake River Basin, home to four imperiled runs of salmon and steelhead
8. Greater Yellowstone Ecosystem, home to the imperiled Whitebark pine, an important food source for the threatened Grizzly bear and other animals
9. The Gulf Coasts flatlands and wetlands, home to the Piping and Snowy plovers, Mississippi sandhill crane, and numerous species of sea turtles
10. The Greater Everglades, home to 67 threatened and endangered species, including the manatee and the red cockcaded woodpecker
Climate change is no longer a distant threat on the horizon, said Leda Huta, executive director of the Endangered Species Coalition. It has arrived and is threatening ecosystems that we all depend upon, and our endangered species are particularly vulnerable.
Seven additional ecosystems were nominated but did not make the Top 10. They nonetheless contain important habitat for imperiled species. These ecosystems include Glacier National Park, the Jemez Mountains, Sagebrush Steppe, U.S. West Coast, the Maine Woods, the Grasslands of the Great Plains and the Southern Rocky Mountains.
Scientists ranked Arctic sea ice and shallow water corals as two of the highest priority ecosystems threatened by climate change in an Endangered Species Coalition report demonstrating the urgency of saving habitat for endangered species. The report, entitled Its Getting Hot Out There: Top 10 Places to Save for Endangered Species in a Warming World was released January 5th, and examines how the changing climate is increasing extinction risk for imperiled fish, plants and wildlife.
Have your say: Is the reality of climate change still in question?
Sustainability of Antarctic toothfish fishery, legitimacy of Marine Stewardship Council Called into Question
Sustainability of Antarctic toothfish fishery, legitimacy of Marine Stewardship Council called into question
By Morgan Erickson-Davis and Jeremy Hance, mongabay.com
January 05, 2011
Patagonian toothfish, also called Chilean sea bass. Photo by Monterey Bay Aquarium Seafood Watch.
In November of 2010, the Antarctic toothfish fishery was deemed sustainable by the Marine Stewardship Council. This certification goes against the advice of many marine scientists who claim that insufficient research has been done to determine the full impact of commercial fishing on this enigmatic species.
Topping out at 300lbs, the Antarctic toothfish is one of the biggest fish in the Southern Ocean. With its ability to produce an antifreeze glycoprotein and a heart that beats just once every six seconds, it is superbly adapted to its Southern Ocean habitat. Unfortunately, it’s also delicious.
Referred to as “white gold” by fishermen, Antarctic toothfish fetches upwards of $35 per pound on the U.S. market where it’s often called “Chilean sea bass”, even though it’s not at all related to sea bass and lives nowhere near Chile. However, even its exorbitant price can’t make up for the costs incurred by fishing vessels when they venture out into the Ross Sea, the habitat of the Antarctic toothfish and one of the few marine safehouses remaining in the world today. Unpredictable sea ice, turbulent waters, and the vast distance from port make the Antarctic toothfishery financially unviable. Yet there is a safety net for the Antarctic toothfish fishery, allowing them to supply “Chilean sea bass” for people wealthy enough to afford it and employ fishermen at “slave wages” in extremely hazardous working conditions - a sustainability certificate from the Marine Stewardship Council which will let the fishery hike up prices.
“Management of this fishery follows precautionary and ecosystem-based principles. Strict harvest control rules, annual stock assessments, mandatory observation of fishing activities and controls on gear to avoid by-catch of seabirds are just some of the practical outcomes of that approach, recognized and rewarded by this certification.” said Chris Ninnes, MSC Deputy Chief Executive, in a November statement congratulating the Antarctic toothfish fishery on its certification.
Antarctic toothfish. Courtesy of NOAA
The certification will allow a harvest of 3000 tons of toothfish per year, with a target reduction of 50 percent of total regional spawning biomass. While MSC maintains that these numbers are obtained through rigorous population analysis, many marine scientists say that they have no real basis.
“We actually know very little about the ecology of Antarctic toothfish, despite MSCs reasoning otherwise.” David Ainley, a marine ecologist who conducts research in the Antarctic, told mongbay.com. “Because of the challenges of conducting science in the ice-choked Ross Sea, we know only vaguely where or when these fish spawn (sometime in winter, and maybe around the sea mounts well north of the Ross Sea), have no idea about natural mortality, a cursory idea of what predators eat them at the early stages, etc. We do know, though, that larger fish are important to sperm whales, killer whales and seals.”
“The lack of insight about what is really going on is the most true for the Antarctic toothfish, which lives in a really harsh area making fishery science difficult at best, and in which all model inputs are educated guesses, i.e. drawn from inputs for fish species elsewhere in other systems. As the head of fishery science for NZs NIWA (John McCoy) recently said in a public speech, fishery science is based on guesses and more and more these days more fish species become fished with fewer and fewer data.”
Ainley explains that the management of many fisheries operate on the belief that removing large fish is good for a population because it encourages the growth of smaller fish, when actually it’s the largest, oldest females that produce the most eggs. This is especially true for long-lived species like the Antarctic toothfish which doesn’t spawn until 16 and can live 50 years. Even agencies which know better may not enforce a policy requiring the release of large fish. In the tuna industry, meat quality significantly increases with size, giving a fish over 100lbs a possibly market value in the many thousands of dollars. Since many captains and crew members work on commission, it would be difficult, perhaps even dangerous, to enforce the release of fish which could make or break a fishing trip.
As Ainley sees it, it’s all about the money.
“The Ross Sea toothfish longline certification cost the industry (paid by the NZ government) $77,000 for the certification.” he says, “The consulting firms that do the certifications live on these fees; there is no way that theyll be turning anyone down and thus lose market share to other consulting firms.”
In addition to its ecological impact, the toothfish industry threatens the lives of many fishermen who brave the huge swells and unpredictable weather of the Southern Ocean.
In December, 22 people were killed when the South Korean trawler Insung No. 1 sank in New Zealand waters while pursuing the Antarctic toothfish. The men were paid very little, $200 to $1030 for up to three months of intense, physical labor aboard the vessel.
The pursuit of the Antarctic toothfish in the Ross Sea can be even more hazardous.
“These are dangerous, ice-covered seas 2500km from nearest port.” says Ainley, ” In the past few years theres been at least one vessel sinking (S Korea), two having to return to port prematurely owing to cracked hulls or other difficulty (NZ), and another that required the US Air Force to airlift, and drop, engine parts for a disabled vessel (UK).”
Many scientists and conservation organizations say that in order to stop unsustainable fishing, consumer habits need to be changed.
“I would recommend that consumers, if they want to make ecologically wise choices, go by the recommendations of Seafood Watch from the Monterey Bay Marine Aquarium. Those people have no financial interests at stake in what they recommend and are keenly interested in protecting the oceans, and the ecofriendly consumers.”
Large-scale cultivation of sea lettuce can help reduce acidification of the oceans. And help solve the global food supply problem to boot.
This idea, presented by Wageningen biologist Ronald Osinga, came as a surprise to delegates at the international coral symposium held in Wageningen last week. The symposium was an initiative by the International Society for Reef Studies (ISRS) and focused on the effects of climate change on coral reefs. Acidification of the oceans is one of the problems, and corals are highly sensitive to it. They become bleached and the calcium they contain dissolves.
But this does not have to happen, says marine biologist Osinga. On the closing day of the symposium he proposed a solution: sea lettuce (ulva lactuca). As it grows, this marine plant lowers the acidity of water. What is more, it is edible. Osinga and his colleagues have calculated that a ‘marine garden’ of 180,000 square kilometres could provide enough protein for the entire world population. A sea lettuce bed of such gigantic proportions would raise the pH (acidity level) of the Mediterranean Sea by one tenth. That may not seem much, but according to Osinga, it would be enough to compensate for the rise in acidity that started with the industrial revolution.
Linking the cultivation of sea lettuce with fish farming would create a closed food cycle, says Osinga. The waste products of the fish would nourish the sea lettuce. Osinga: ‘Offshore fish-farming is a massive polluter. It’s much better if you can recycle these nutrients. There is a lot of interest nowadays in this sort of integrated concept.’
Osinga and his University of Amsterdam colleague Jaap Kaandorp brought the symposium to Wageningen in order to draw attention to Dutch coral research. Wageningen UR plays a modest role in this research, but that may be about to change through the accession of the ‘BES’ islands (Bonaire, St. Eustatius and Saba) in the Caribbean to the Netherlands. But that is a separate issue, says Osinga, and not the reason for the symposium. ‘It’s a coincidence. But a useful one, with all the attention to the coral reefs around the BES islands.’ Three hundred scientists from all over the world took part in the symposium. / Roelof Kleis
The above article was written by the editorial staff of Resource, the bi-weekly newspaper for Wageningen University and Research centre. For more information, contact the press and science information officer of Wageningen UR, e-mail: firstname.lastname@example.org or the editorial staff of Resource, e-mail: email@example.com. See the archived articles at resource.wur.nl