INNOVATIVE LAB GAUGES ACIDIFICATION EFFECTS ON MARINE SNAILS

Michael Maher working at the NOAA Northwest Fisheries Science Center Mukilteo field station with Mobile Ocean Acidification Treatment Systems (MOATS). Credit: NOAA NWFSC

Carbon dioxide scrubbers like those that clean the air in space stations.

Precision monitors and instruments.

Industrial parts used in wastewater treatment.

Michael Maher’s job was to assemble the pieces into one of the most sophisticated ocean acidification simulation systems yet developed. Ocean acidification is the decrease in ocean pH due to its absorption of carbon dioxide from the atmosphere – carbon dioxide forms an acid when it dissolves in water.

“You have tools available – they may not be designed for this purpose but you can try to make them all work together,” said Maher, a research biologist at NOAA Fisheries’ Northwest Fisheries Science Center in Seattle. “There wasn’t a blueprint or a kit you could order because nobody had really been trying to do this kind of thing before.”

The system that Maher and the ocean acidification research team built in the Science Center’s parking lot has provided new insight into the impacts of future ocean conditions on marine species. Researchers used it to examine what happens to small marine snails from Puget Sound when exposed to both current ocean conditions and the acidified conditions expected in the future. The research is described in a new paper in the online journal PLOS ONE reporting that current West Coast ocean waters are acidified enough to dissolve the shells of the snails, called pteropods.

The finding is not a surprise: Another NOAA-led team reported in April that shells of pteropods in near-shore habitat on the West Coast show signs of dissolution due to acidified waters. What is important about the new research is that it measured the extent of shell damage at escalating carbon dioxide concentrations, each translating to a different degree of acidification, in a controlled laboratory environment said Shallin Busch, a NOAA research ecologist.

The findings are a first step toward using the pteropod species examined in the study as a living barometer or indicator of ocean acidification along the West Coast.

“Our findings are a piece of the puzzle,” said Busch, the lead author of the new paper. “Now we know, yes, pteropods from the North Pacific are sensitive to ocean acidification. Now that we have confirmed their sensitivity, we need to look more closely at how pteropods are responding to current ocean conditions and what may happen in the future as carbon dioxide increases.”

Pteropods provide important nutrition for whales, seabirds and fish such as herring, salmon and mackerel, so changes in their populations could rattle through the marine food chain. Carbon emissions during the industrial era have lowered the average global ocean pH from 8.2 to 8.1, turning oceans slightly more acidic. West Coast waters are naturally acidified compared to other parts of the ocean so they may affect marine life such as pteropods sooner than acidifying waters elsewhere in the world.

The research also demonstrated the capacity of the NWFSC’s ocean acidification system to hold marine life at different carbon dioxide concentrations for extended periods. The system can control temperatures, oxygen levels and light for even more precise management of conditions during experiments.

“They are all dependent on each other – if you change the temperature, the pH will change,” Maher said. The system that carefully manages all the variables is “ a combination of machines and precisions instruments.”

The comprehensive controls allow researchers to isolate acidification as the cause of the shell damage, ruling out other factors that might otherwise be at play in a natural environment.

“There are not a lot of cases where we can definitively say, ‘This change is the result of acidification,’” said research ecologist Paul McElhany, Busch’s colleague at NWFSC. “It’s very hard to disentangle unless you know that’s the only thing changing. Experiments like this provide evidence about the effects of acidification alone.”

Busch said each member of the research team – Maher, McElhany and NOAA Hollings Scholar Patricia Thibodeau – brought individual skills to the research. The team has also developed a smaller and transportable version called a Mobile Ocean Acidification Treatment System, or MOATS that could be carried in the field or aboard research ships.

Thibodeau joined the research team for the summer of 2012 after her junior year at Bowdoin College in Maine. One of her initial tasks was to collect pteropods from Puget Sound by boat at night to stock the experimental system. Pteropods ascend in the water column at night to feed. The vertical movement naturally exposes them to varying carbon dioxide concentrations, which the ocean acidification system can simulate.

Later Thibodeau helped examine the shells of pteropods exposed to different concentrations of carbon dioxide. As with most science experiments where objectivity is paramount, she did not know which ones had been exposed to which concentrations when she rated the extent of damage to each shell.

“Sometimes biology can be so unpredictable, but this had such a clear outcome and relationship, it was very interesting to be a part of,” said Thibodeau, who just began work on her PhD at the Virginia Institute of Marine Science. “There is definitely a human component to the issue because so many of us eat oysters and clams and other species affected by ocean acidification. So what we know and what we do really makes a difference.”

NOAA Hollings Scholar, Patricia Thibodeau collects seawater from Puget Sound for chemistry measurement. Credit: NOAA NWFSC

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Pacific Ocean acidity dissolving shells of key species

Pacific Ocean acidity dissolving shells of key species: New research from NOAA sounding alarm bells about climate change

By Paul Rogers/San Jose Mercury News and Will Houston/The Times-Standard

In a troubling new discovery, scientists studying ocean waters off California, Oregon and Washington have found the first evidence that increasing acidity in the ocean is dissolving the shells of a key species of tiny sea creature at the base of the food chain.

The animals, a type of free-floating marine snail known as pteropods, are an important food source for salmon, herring, mackerel and other fish in the Pacific Ocean. Those fish are eaten not only by millions of people every year, but also by a wide variety of other sea creatures, from whales to dolphins to sea lions.

Humboldt State University Oceanography Department Head Jeffrey Abell has conducted several studies on ocean acidification off the coast of Trinidad, most recently in 2010. Abell said that deeper ocean waters are usually more acidic due to bacteria digesting dead organism matter, called detritus, which floats to the ocean floors. This digestion releases carbon dioxide, which reacts with water and causes the ocean to increase in acidity. Abell said Humboldt County’s shoreline is more prone to upwelling events in the late spring, which brings this deep, more acidic water to the surface.

“We don’t see a consistent exposure to acidic waters,” he said. “What we see is in the order of a few times to a dozen times a year during which the organisms, like pteropods, will be exposed to this corrosive water.”

Abell said Trinidad experienced about five of these events in 2007 — lasting no longer than a few days — but that number tripled to 15 episodes in 2010 that sometimes lasted over a week.

If the trend continues, climate change scientists say, it will imperil the ocean environment.

“These are alarm bells,” said Nina Bednarsek, a scientist with the National Oceanic and Atmospheric Administration in Seattle who helped lead the research. “This study makes us understand that we have made an impact on the ocean environment to the extent where we can actually see the shells dissolving right now.”

Scientists from NOAA and Oregon State University found that in waters near the West Coast shoreline, 53 percent of the tiny floating snails had shells that were severely dissolving — double the estimate from 200 years ago.

Until now, the impact on marine species from increasing ocean acidity because of climate change has been something that was tested in tanks in labs, but which was not considered an immediate concern like forest fires and droughts.

The new study, published in the Proceedings of the Royal Society B, a scientific journal based in England, changes that.

“The pteropods are like the canary in the coal mine. If this is affecting them, it is affecting everything in the ocean at some level,” said one of the nation’s top marine biologists, Steve Palumbi, director of Stanford University’s Hopkins Marine Station in Pacific Grove.

The vast majority of the world’s scientists — including those at NOAA, NASA, the National Academy of Sciences and the World Meteorological Organization — say the Earth’s temperature is rising because of humans burning fossil fuels like oil and coal. That burning pumps carbon dioxide into the atmosphere and traps heat, similar to a greenhouse. Concentrations of carbon dioxide in the Earth’s atmosphere have increased 25 percent since 1960 and are now at the highest levels in at least 800,000 years, according to measurements of air bubbles taken in ancient ice and other methods.

Many of the impacts are already being felt. Since the 1880s, when modern temperature records were first taken, the 10 hottest years have all occurred since 1998. Polar ice has melted, forest fires are burning in the West with increasing frequency, and the ocean has risen 8 inches since 1900 at the Golden Gate Bridge.

But what many people do not realize is that nearly a third of carbon dioxide emitted by humans is dissolved in the oceans. Some of that forms carbonic acid, which makes the ocean more corrosive.

Over the past 200 years, the ocean’s acidity has risen by roughly 30 percent. At the present rate, it is on track to rise by 70 percent by 2050 from preindustrial levels.

More acidic water can harm oysters, clams, corals and other species that have calcium carbonate shells. Generally speaking, increasing the acidity by 50 percent from current levels is enough to kill some marine species, tests in labs have shown.

Coastal Seafoods manager Greg Dale said Humboldt County’s oyster industry has actually thrived over the last two years, but rising ocean acidity is “something we watch carefully.”

“If this keeps going, and it means shutting ocean productivity, that’s when things get scary,” Dale said. “The ocean changes every year, but if you change the (acidity), you will lose a great deal.”

Abell said the current ocean acidification levels are not enough to harm the shells of oysters or abalone, which are made of calcite, but are enough to dissolve the shells of pteropods, which are made of aragonite.

“Pteropods are the most sensitive of this process; they’ll be kind of like an early warning system,” Abell said. “The present school of thought is that 50 years from now is when we’ll have to worry about the more sturdy shellfish, such as abalone.”

The new research on the marine snails does not show that increasingly acidic water is killing all of them, particularly older snails. But it is causing their shells to dissolve, which can make them more vulnerable to disease, slow their ability to evade predators and reduce their reproductive rates, the researchers said.

Some of the corrosive water near the shore could be a result of other types of pollution, such as runoff from fertilizer and sewage, said Stanford’s Palumbi, who was not involved in the NOAA research. But because the study found rates of the snails’ shells dissolving in deep water, far from the shore, human-caused carbon dioxide is the prime suspect, he added.

If people reduce emissions of fossil fuels, cutting carbon dioxide levels in the decades ahead, the damage to the oceans can still be limited, he said.

“But if we keep on the emissions profile we have now, by 2100 the oceans will be so harmed it’s hard to imagine them coming back from that in anything less than thousands of years,” Palumbi said.

“We are in a century of choice,” he said. “We can choose the way we want it to go.”

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Lucrative crab industry in danger

Lucrative crab industry in danger | Sea Change: Ocean acidification | The Seattle Times

DUTCH HARBOR, Alaska — For decades, the crab piled up in fishing boats like gold coins hauled from a rich and fertile sea.

But the very ocean that nursed these creatures may prove to be this industry’s undoing.

New research earlier this year shows that Bristol Bay red king crab — the supersized monster that has come to symbolize the fortunes of Alaska’s crab fleet — could fall victim to the changing chemistry of the oceans.

Barring a hasty reduction in carbon-dioxide emissions — or evidence that the creatures could acclimate to changing sea conditions — a team of scientists fears Alaska’s $100 million red king crab fishery could crash in decades to come.

That grim possibility also raises alarm about the crab fleet’s other major moneymaker, snow crab.

“With red king crab, it’s all doom and gloom,” said Robert Foy, who oversaw the crab research for the National Oceanic and Atmospheric Administration (NOAA) in Kodiak, Alaska. “With snow crab, there’s so little known we just can’t say. But we don’t see anything from our experience that’s good for any of these crab. Some is just not as bad as others.”

Said Mark Gleason, director of the Seattle-based industry trade group Alaska Bering Sea Crabbers, “From my perspective, the chemistry is pretty clear-cut.”

For decades, these storied crustaceans have drawn men and women from Seattle to the far reaches of the North Pacific. There, adventurers wrestled 800-pound steel cages amid raging seas and aprons of pack ice, hoping to strike it rich on a bounty of flaky meat and accordion legs.

The emerging issues with Alaska’s crab underscore a predicament that stretches beyond the North Pacific. It gets to the difficulty of trying to comprehend the depth of fallout from ocean acidification.

For reasons scientists don’t always understand, similar species, even those living side by side, often respond to changing water chemistry in remarkably different ways.

“The real issue here is unpredictability,” said Richard Aronson, a Florida-based marine scientist who has tracked king crab in Antarctica. “There are all these unanticipated collateral impacts. The problem is, most of them are nasty surprises.”

‘We’re scared to death’

Certainly the threat to king crab was unexpected.

As humans pump carbon dioxide into the atmosphere, a quarter of it gets absorbed by the seas. That lowers the water’s pH and alters the availability of carbonate ions, which crab rely on to build their exoskeletons.

Many crab species appear hardy in the face of souring seas, or at least not so frail. Exceedingly corrosive waters actually pump up Maryland blue crab to three times their size and turn them into voracious predators. Sour waters kill Dungeness crab, but far less often than Alaska red king crab.

When Foy and his colleagues exposed baby red king crab to CO₂ levels expected by midcentury, the young died more than twice as often as crab raised in normal water. When researchers boosted CO₂ to levels expected decades later, red king crab died in far larger numbers.

“The overall survival at the larval and juvenile stage is extremely low,” Foy said. “It decreases to a point that is likely to affect the population of the crab.”

Such a loss would exact quite a toll.

“You say king crab, and most people associate that with Alaska,” said longtime crab-boat captain Kale Garcia, who lives outside Kent. “So, for it to go away, that’s a huge part of the identity for Alaska. I think it’d be devastating. I know it’d be devastating for me.”

Red king crab is the showboat of the Northwest’s billion-dollar fishing industry. It is a television sensation and a marketer’s dream, its image emblazoned on bumper stickers, mugs, caps and T-shirts throughout the Pacific Northwest and Alaska.

It is even a tourist attraction: Cruise-ship passengers stopping in Ketchikan pay $159 for a half-day ride to watch crews haul marine life aboard a 107-foot crab boat that appeared on Discovery Channel’s “Deadliest Catch.”

Alaska’s commercial crabbers also catch small loads of golden king crab and Tanner crab, but the real cash comes from just two species — red king crab and snow crab. The 54 million pounds of snow crab caught in 2011 brought the fleet $115 million dockside. But a mere 14.8 million pounds of red king crab brought nearly as much — $92.5 million. And it can fetch $39.99 a pound at Pike Place Market.

Crabbing attracts tough adrenaline junkies who disappear for weeks into the storm-buffeted frontier of the Bering Sea. They lounge in cramped quarters watching bad movies and wait for crab to fill their cages. Then workers scramble day or night on icy decks through stomach-churning swells, amped on coffee and nicotine.

“A lot of people that are involved in the industry, it’s something they’ve been in forever,” Garcia said. “People like that don’t plan an exit strategy out of the fishery. There is no exit strategy. They’re like ‘This is what we do. We fish.’ ”

NOAA researchers are using Bob Foy’s research to develop models and a timeline that charts the potential collapse of king crab. But things are changing quickly.

“Bob reared those crabs under conditions that we thought were some time off in the future,” said Jeremy Mathis, a NOAA oceanographer who specializes in Alaska and the Arctic. “And what we actually found is that in certain times of the year, the conditions near the bottom in the Bering Sea were actually worse than the conditions that Bob was raising his crabs under.”

There’s no evidence that souring seas have yet altered wild populations — the most corrosive seas now occur at times when red king crab aren’t as susceptible. But Alaska’s crab industry has followed the science closely.

“All of us in the fishing industry are looking at each other and going ‘This sucks,’ ” said Ed Poulsen, former science adviser to the crab industry group. “I can tell you right now I’m doing all I can to get into other fisheries. I’m diversifying. With these changes in the environment, I think things are probably not going to get better.”

Still, Jim Stone, of Lakewood, Pierce County, co-owner of the Bering Sea crab boat Arctic Hunter, is trying to remain optimistic.

“We’re scared to death,” Stone said. “But we’ve heard a lot of horror stories before.”

Adaptation possible, but uncertain

The research comes with plenty of caveats. No laboratory setting can ever properly approximate what happens in nature. Scientists are still conducting genetic tests to see if king crab might have the ability to adapt.

“It’s not unreasonable to assume, for example, that they might move, that some form of rapid evolution will occur, that they may become somewhat more robust,” said Andre Punt, a University of Washington professor who worked on the research and assesses crab for fishing regulators.

But the situation also might be worse than first thought. Souring seas could hit crab at several additional stages of development or attack their food.

“They could be impacted in other parts of the water column,” Punt said. “The prey that they’re eating could be impacted.”

Ocean acidification is also not the only marine-world change under way. Warming seas, also caused by carbon emissions, could compound crab’s troubles.

“Anytime you’re working with an organism at the edge of its threshold and you add another stressor, that’s going to be an issue,” Foy said. “When you’re working in the subarctic environment like we are in the Bering Sea, these animals are always living at the edge of their tolerance in one season or another.”

And while king crab’s future has everyone scrambling, the future for snow crab, which brings in more money, could be equally disconcerting.

No two crab species react same way

No two Alaskan crab species have responded to CO₂ exactly the same way. They seem to react differently depending on where they live at certain stages of their lives.

Golden king crab, for example, live extremely deep, below 1,000 feet, where waters already are naturally rich in CO₂. That appeared to make them highly tolerant of sea-chemistry changes.

Meanwhile, baby Tanner crab exposed to high CO₂ died at a higher rate than normal — but nowhere near as often as king crab. Foy suspects that’s because young Tanner crab live in water that already experiences vast swings in pH, depending on tides, time of day and photosynthesis.

Tanner crab probably are used to more variations than king crab, which remain on the outer continental shelf.

While snow crab are genetically similar to Tanner crab, their young spend more time at moderate depths.

But with snow crab, scientists have struggled to perform extensive tests. The animals are just too hard to keep alive in the lab.

It’s also hard to know how Foy’s results will translate to other species in other waters.

A related king crab species has recently been seen by the millions in Antarctica, where it is devouring shellfish and starfish. Scientists are debating whether or not the crab is native.

Will more acidic conditions kill these creatures or drive them out? Since they often occupy far deeper water, does that mean they instead might thrive?

“There’s a lot of ifs, ifs, ifs,” said Aronson, who documented Antarctica’s crabs during a cruise in 2010. “I’ve found that the number of times the surprise with carbon-dioxide emissions has been undesirable far outweighs the times it’s been desirable.”

The weird purgatory for these signature creatures unnerved Brett Robinson, who captains Stone’s Arctic Hunter.

“It’s scary as hell, if something doesn’t get figured out,” Robinson said. “I don’t know.”

“I guess you won’t have to fish for them” in the future, he added. “They’ll figure out how to grow these things in an aquarium or something.”

Hatchery may be part of future

Scientists in Seward, a thousand miles from the fishing grounds, are working toward just that.

For years, a shellfish hatchery has been learning how to raise baby king crab from scratch. The program started as an experiment to see if baby crab could be transplanted near Kodiak Island, where massive crab populations crashed in the 1970s and 1980s. But the rising threat from acidification has insiders closely watching their work.

Crab are most susceptible to corroding seas as babies, when a mere fraction of young survive even in perfect conditions. At the Alutiiq Pride Shellfish Hatchery, survival can be 500 times higher.

Still, no one expects this operation could ever replace wild king crab. The orders of magnitude required to get enough crab to populate the Bering Sea would be ridiculous.

But perfecting the science could provide options, such as the ability to repopulate a few previously devastated areas.

“We’re hoping that it never gets to the point that they rely on the hatchery for that kind of work,” hatchery manager Jeff Hetrick said. “If we get to that point I think we’re in trouble. But it is a possibility.”

The idea that crab might be partially grown in a lab instead of the ocean frustrated Mizrain Rodriguez, another Arctic Hunter crewman. But it also saddened him to think that humans could be doing such damage to the sea.

“Every single animal on this planet lives in balance with its surroundings except us,” Rodriguez said. “We see it. We understand it. But we don’t want to do anything about it. It seems like we are on this destructive path.”

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California congressman calls ocean acidification “the biggest thing no one is talking about”

SEAFOODNEWS.COM Press-Democrat] By Mary Callaghan – June 18, 2014 –

BODEGA BAY, It’s been called the “evil twin” of climate change, an environmental peril so daunting and widespread that it could undo much of the world’s food web, undermine global nutrition and devastate coastal economies.

Ocean acidification, however, is often largely overlooked outside the circles of scientists, yet North Coast Congressman Jared Huffman is seeking to somehow change that and spur action on the issue before it’s too late.

Acidification of the world’s oceans, said Huffman, D-San Rafael, “is the biggest thing that nobody is talking about.”

Shellfish grown off the nation’s West Coast already display the ill effects of rapid changes in the ocean’s chemistry, an early sign that the health of the marine ecosystem could hang in the balance, Huffman said.

“You can’t really overstate the impact of this,” Huffman said at a news conference this week at Bodega Marine Laboratory that was attended by representatives from science, aquaculture and government.

“We’re very, very quickly approaching the tipping point, I believe,” Huffman said.

Huffman’s district runs from the Golden Gate to the Oregon border, taking in about a third of the coast of California, where seafood is a $24-billion industry, supporting 145,000 jobs.

The 2nd Congressional District is on the front lines of the issue because the shift toward ocean acidity is expected to be especially pronounced along the North Coast, said John Largier, an environmental science and policy professor at Bodega Marine Lab.

Absorption of excess carbon dioxide pumped into the atmosphere at historically high rates is lowering the pH of oceans around the planet, scientists say.
Its impact on the North Coast is amplified by a natural upwelling that serves as a kind of conveyor belt, bringing deep water made naturally acidic and rich in carbon dioxide by decaying organic matter toward the surface, where it absorbs still more carbon dioxide.

This dynamic effectively puts the northern California coast “at the forefront of acidification,” said Largier, who is one of several marine lab scientists studying aspects of acidification and was among those joining Huffman on Monday.

And yet, while global warming has a high degree of public recognition, ocean acidification is a less familiar phenomenon, Huffman said.

Terry Sawyer, owner of Hog Island Oyster Co. on Tomales Bay, put it this way: “We’re dealing with something that’s hard to touch. It’s hard to see, hard to taste, smell, etc.”

Huffman organized the event in part to highlight bipartisan legislation that he is co-sponsoring with Washington state Congressman Derek Kilmer. The Ocean Acidification Innovation Act is intended to spark new research and innovation in adaptive strategies through X-Prize-style competitions. The bill would leverage existing federal funds to create competitions for research into solutions, Huffman said.

But he said he also wanted to awaken public awareness to an environmental threat that has yet to receive the attention given to climate change. “This one has a potential to just be enormous and overwhelming,” he said.

“Nothing is quite as scary as acidification,” said Zeke Grader, executive director of the Pacific Coast Federation of Fishermen’s Associations.

Scientists say the oceans absorb a quarter or more of the carbon dioxide humankind puts into the atmosphere — about 22 million tons a day, on top of the estimated 525 billion tons absorbed over the past two centuries. What exactly that means for the planet is still not known, Largier said, though “it doesn’t look good.”

Shellfish, however, and particularly West Coast oysters, are providing some clues. Scientists are looking at reproductive failures in their midst in recent years — problems they ascribe to the interference of low pH water with the synthesis of calcium carbonate through which oyster larvae, and presumably other shellfish, develop hard, protective shells.

Sawyer and other West Coast purveyors of farm-raised oysters have seen “complete crashes” at some hatcheries in the Pacific Northwest, where he and other producers obtain the oyster larvae to seed their farms. Sawyer has had similar die-offs at his Tomales Bay operation, enough so that he’s building a new hatchery in Humboldt Bay to provide seed for his farm. He and his staff, meanwhile, are working closely with the marine lab to monitor and document conditions at his facility and develop strategies to try to adapt.

The entire fishing industry is at risk, given the role of calcium carbonate synthesis in skeletal development, potentially disrupting the entire food web, from the lowest phytoplankton on up, Largier said.

Largier and his colleagues emphasized that the world’s oceans are already contending with pollution, areas of low oxygen and rampant over fishing. Those problems are likely to compound any effects of acidification.

“The science is really early days,” Largier said.

UC Davis researcher Daniel Swezey, said one of the alarming features of ocean acidification is that a certain amount is inescapable, given the volume of past and current carbon dioxide emissions. “We’re kind of locked in to a certain amount of change,” he said. Largier said reducing carbon dioxide emissions is the only real fix but conceded that even large-scale, global changes in human behavior might not be evident for decades.

But that’s “no reason not to start acting now,” Largier said.

“Even if we completely adapt,” said Grader, “if we don’t start changing the ways we’re doing things now, we’re going to lose our ocean. We’re going to lose the planet.”

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Point of View: Seafood’s future hinges on reducing carbon pollution

By Bruce Steele
June 01, 2014

Bruce Steele has spent more than 40 years as a commercial diver and fisherman in Oregon and California. He is a longstanding leader in resource management and industry associations.

A decade ago, Japanese researchers showed that seawater soured by carbon pollution would hamper sea urchins’ reproductive capabilities. I read their report and saw trouble on the horizon. As a commercial urchin diver in California, I hoped this trouble would stay far away. Now it’s here.

Christina Frieder at UC-Davis has demonstrated that waters acidified to pH 7.8 — a level already detected along the West Coast — can reduce fertilization success by 20 percent in red sea urchins, which are harvested from California to Alaska. Frieder states that 60 percent reductions in fertilization success may occur in the decades ahead as pollution pushes seawater pH down to 7.5. This means that red sea urchins will have a harder time recruiting into the fishery, and they will be less abundant. Surface waters had an average pH of 8.2 in pre-Industrial times; acid from carbon emissions has reduced that to about 8.1 in today’s ocean, and it’s heading south fast.

Now ocean acidification is my problem. If you work in seafood, it’s yours too.

Red king crab suffers 100 percent mortality of larvae after 90 days in seawater at a pH of 7.5. Oysters, mussels, clams, abalone and some scallops are vulnerable, which shellfish farmers are learning the hard way. Corals that shelter vulnerable fish populations in much of the world are at risk. Shells of pteropods, common zooplankton that are a key food source for salmon, are already dissolving in Pacific Northwest waters. Two recent studies found that modest levels of acidification can impair growth in American lobsters. Direct impacts on fish are also becoming clear: Some fish lose their ability to smell and evade predators or distinguish them from their own prey. The catalog of harm includes damage to organ tissues, neurological functions, growth and reproduction.

For the seafood industry, some consequences are now inevitable. But there is no place to hide, so we had better defend ourselves. Both the causes and the consequences of acidification can be reduced.

How to curb the causes? Strong policies to reduce carbon emissions would be a good start. Without those, everything else we do will amount to an epitaph.

This industry can and should push Congress and the Obama administration to protect fisheries from carbon pollution. California and nine Atlantic states from Maine to Maryland have embraced market-based systems — akin to individual fishing quotas — to cut emissions. This hasn’t broken their economies. Now even China is trying a market system to cut emissions in five cities. India has launched the world’s first nationwide cap-and-trade regime to curtail carbon pollution.

Protecting seafood supplies will require especially deep cuts in carbon pollution. A recent paper published in Nature by Steinacher, et al., illuminates the geochemical vulnerability of productive fisheries: If CO2 emissions push atmospheric concentration beyond 550 parts per million, more than 90 percent of waters where coral reefs grow are likely to become chemically hostile to many corals and other calcifiers.

How to reduce harm? We are learning tools for adaptation. To save collapsing “seed” supplies for Pacific Northwest shellfish farms,  hatcheries have found effective but costly ways to measure and manipulate seawater chemistry in their tanks. That’s how they protect larvae that were dying by the billions in corrosive waters during their most vulnerable first days of life. In coastal bays, researchers along the West Coast are investigating whether photosynthesis by sea grass can soak up enough CO2 to protect neighboring calcifiers from acidifying waters, a research priority identified by Washington’s Blue Ribbon Panel on Ocean Acidification.

Can we protect fish stocks in open waters? Maybe. No-fishing areas, which I fought for many years, do increase density and size of formerly fished stocks. That might help protect reproductive capacity of broadcast spawners like red sea urchins: Acidification makes their sperm swim slower and survival time of urchin sperm limits successful fertilization. Another approach is increasing the size limit of sea urchins that can be harvested, to increase sea urchin densities and spawning success.

Working with researchers from two University of California campuses, the sea urchin industry has funded and facilitated a long-term study of larval sea urchin recruitment. Our one-of-a-kind data set shows trends in sea urchin survival at 15 sites. If decreased red sea urchin recruitment does show up, we will see it in the data. Keeping track of recruitment has helped us manage our fishery in the past and it will help us recognize when we need to protect spawning capacity. But that’s only treating the symptom.

Frieder’s findings on red sea urchins are a harbinger of trouble for the whole ocean. To stay in business, seafood producers of all kinds will need to belly up to some tough new management practices. We will also need to become effective champions for pollution controls that most of us have ignored until now.

Bruce Steele has spent more than 40 years as a commercial diver and fisherman in Oregon and California. He is a longstanding leader in resource management and industry associations.

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Seafood industry under threat from climate change

By April Forristall, SeafoodSource.com assistant editor
Published on 28 May, 2014

A report released on Wednesday reveals the growing threat of climate change and acidification to marine resources.

The report contains findings from the Intergovernmental Panel on Climate Change Fifth Assessment Report and was published jointly by Sustainable Fisheries Partnership (SFP) and the University of Cambridge Institute for Sustainability Leadership and Judge Business School and supported by the European Climate Foundation.

Findings include:

• The total loss of landings to global fisheries by 2050 due to climate change range from USD 17 billion (EUR 12.5 billion) to USD 41 billion (EUR 30.1 billion) based on a global warming scenario of 2 degrees.
• Fishery yields will increase 30 – 70 percent in high latitudes but fall by 40 – 60 percent in the Tropics and Antarctica based on 2 degrees of warming. Large species like tuna in the Pacific and Indian oceans are likely to move eastwards.
• 400 hundred million people depend critically on fish for their food and face reduced access to marine protein because of climate change and acidification. Artisanal fishermen in the Tropics are most at risk.
• Changes in the distribution of particular marine species may lead to conflict between fishing nations and significant increases in illegal fishing.
• The impacts of climate change and ocean acidification are generally exacerbated by other factors like pollution, habitat loss and over-fishing

“This report is a wake up call for the seafood industry to recognize the scale of the threat to ocean resources from climate change and acidification,” said Blake Lee-Harwood of SFP. “We need to see urgent action in trying to mitigate the likely impacts while adapting wherever that’s practically possible.”

“This briefing highlights the business-critical implications of climate change for the fisheries sector, representing tens of billions of dollars in future costs and damages for the industry. Companies in this sector will have to take the implications of climate science into account as they plan for the future. We hope that this briefing, developed with experts from both business and science, will help them do so,” said Eliot Whittington of the University of Cambridge Institute for Sustainability Leadership.
 
The report cites areas where action can be taken to lessen the impact of climate change:

• Adapt where possible — for instance, some shellfish hatcheries in the north west USA have learned to avoid taking in seawater during periods of high acidity
• Undertake vulnerability assessments of fisheries and aquaculture operations
• Strengthen coastal zone management to reduce land-sourced pollution, over-harvesting and physical damage to resources
• Create new habitats such as artificial reefs to act as fish nurseries in areas where coral reef destruction occurs

 

Vital part of food web dissolving

Scientists have documented that souring seas caused by CO2 emissions are dissolving pteropods, a key marine food source. The research raises questions about what other sea life might be affected.

It didn’t take long for researchers examining the tiny sea snails to see something amiss.

The surface of some of their thin outer shells looked as if they had been etched by a solvent. Others were deeply pitted and pocked.

View the article here. — SeattleTimes.com
Story by
CRAIG WELCH

Time to Take Ocean Acidification Seriously?

    
November 22, 2013 — HUMANS, being a terrestrial species, are pleased to call their home “Earth”. A more honest name might be “Sea”, as more than seven-tenths of the planet’s surface is covered with salt water. Moreover, this water houses algae, bacteria (known as cyanobacteria) and plants that generate about half the oxygen in the atmosphere. And it also provides seafood—at least 15% of the protein eaten by 60% of the planet’s human population, an industry worth $218 billion a year. Its well-being is therefore of direct concern even to landlubbers.

That well-being, some fear, is under threat from the increasing amount of carbon dioxide in the atmosphere, a consequence of industrialisation. This concern is separate from anything caused by the role of CO2 as a climate-changing greenhouse gas. It is a result of the fact that CO2, when dissolved in water, creates an acid.

That matters, because many creatures which live in the ocean have shells or skeletons made of stuff that dissolves in acid. The more acidic the sea, the harder they have to work to keep their shells and skeletons intact. On the other hand, oceanic plants, cyanobacteria and algae, which use CO2 for photosynthesis, might rather like a world where more of that gas is dissolved in the water they live in—a gain, rather than a loss, to ocean productivity.

Read story from Saving Seafood here.
Read story from The Economist here.

Ocean acidification progressing at an alarming rate

SEAFOOD.COM NEWS [BBC] By Matt McGrath – November 15, 2013 -The world’s oceans are becoming acidic at an “unprecedented rate” and may be souring more rapidly than at any time in the past 300 million years.

In their strongest statement yet on this issue, scientists say acidification could increase by 170% by 2100. They say that some 30% of ocean species are unlikely to survive in these conditions.

The researchers conclude that human emissions of CO2 are clearly to blame.

The study will be presented at global climate talks in Poland next week.

In 2012, over 500 of the world’s leading experts on ocean acidification gathered in California.

Led by the International Biosphere-Geosphere Programme, a review of the state of the science has now been published.

This Summary for Policymakers states with “very high confidence” that increasing acidification is caused by human activities which are adding 24 million tonnes of CO2 to oceans every day.

Read the full article here.

Ocean acidification, the lesser-known twin of climate change, threatens to scramble marine life on a scale almost too big to fathom.

NORMANBY ISLAND, Papua New Guinea — Katharina Fabricius plunged from a dive boat into the Pacific Ocean of tomorrow.

She kicked through blue water until she spotted a ceramic tile attached to the bottom of a reef.

A year earlier, the ecologist from the Australian Institute of Marine Science had placed this small square near a fissure in the sea floor where gas bubbles up from the earth. She hoped the next generation of baby corals would settle on it and take root.

Fabricius yanked a knife from her ankle holster, unscrewed the plate and pulled it close. Even underwater the problem was clear. Tiles from healthy reefs nearby were covered with budding coral colonies in starbursts of red, yellow, pink and blue. This plate was coated with a filthy film of algae and fringed with hairy sprigs of seaweed.

Instead of a brilliant new coral reef, what sprouted here resembled a slimy lake bottom.

Isolating the cause was easy. Only one thing separated this spot from the lush tropical reefs a few hundred yards away.

Carbon dioxide.

In this volcanic region, pure CO2 escapes naturally through cracks in the ocean floor. The gas bubbles alter the water’s chemistry the same way rising CO2 from cars and power plants is quickly changing the marine world.

In fact, the water chemistry here is exactly what scientists predict most of the seas will be like in 60 to 80 years.

That makes this isolated splash of coral reef a chilling vision of our future oceans.

Watch the introduction video.

Read the complete article, watch the videos and look at the images here.