A jellyfish under the Ross Sea ice, on October 14, 2005 (Photo by Henry Kaiser, courtesy of the National Science Foundation)
Some scientists are warning
that as overfishing and climate
change affect the world’s oceans,
jellyfish will take over the
ecosystem. That could mean that
eventually, if you cast a net
into the ocean all you’d haul
in would be jelly blobs. But
as Ann Dornfeld reports, such
warnings may be premature:
Transcript
Some scientists are warning
that as overfishing and climate
change affect the world’s oceans,
jellyfish will take over the
ecosystem. That could mean that
eventually, if you cast a net
into the ocean all you’d haul
in would be jelly blobs. But
as Ann Dornfeld reports, such
warnings may be premature:
The theory goes like this. Overfishing is removing the main jellyfish predators from the oceans. And warming oceans could be more hospitable to jellies.
A new report published in the journal Trends in Ecology and Evolution says jellyfish are already taking over. Its authors point to recent big jellyfish blooms as evidence.
But not everyone’s convinced.
“I think there’s a set of people that are sensationalizing the jellyfish bloom issue.”
University of Washington researcher Claudia Mills has been studying jellies for 30 years.
“I do think that probably jellyfish blooms are on the increase. But the problem is, we have so little baseline data that it’s almost impossible to really, honestly know that.”
Mills says there’s hardly any historical data on jellyfish populations, and not even much recent data.
She says it could be that the future of the world’s oceans is gelatinous and tentacled… or the blooms could just be cyclical.
The island of Bonaire is somewhat of an anomaly in the Caribbean due to its remarkably preserved coral reefs (Photo by Ann Dornfeld)
(Photo by Ann Dornfeld)
(Photo by Ann Dornfeld)
(Photo by Ann Dornfeld)
Scientists say nearly half of the coral reefs in the US are in bad shape.
Many are dead. The situation is similar in much of the world. But not
everywhere, as Ann Dornfeld found on the Caribbean island of Bonaire:
Transcript
Scientists say nearly half of the coral reefs in the US are in bad shape.
Many are dead. The situation is similar in much of the world. But not
everywhere, as Ann Dornfeld found on the Caribbean island of Bonaire:
(sound of waves on shore)
Jerry Ligon was working as the on-board naturalist on a small Caribbean
cruise ship when he first saw Bonaire.
“And I saw how clear the water was. And I’d been able to compare, during
my stint on the cruise ship, other islands in the Caribbean, and I realized
how special Bonaire was. So that was at the end of my contract, so I
decided to stay here. And I’ve been here for 15 years!”
It’s wasn’t just the clarity of Bonaire’s water that made Ligon stick around. It
was the remarkably healthy coral reefs that lay beneath the waves.
“I can even talk to divers who come to Bonaire and they say, ‘What
fantastic diving!’ and they remember, ‘This is how the way it was in Cayman
Islands 25 years ago!'”
Ligon says the Cayman Islands might have even had more impressive
reefs than Bonaire’s back in the day. But coral throughout the US and
Caribbean has been in sharp decline for decades.
So how do Bonaire’s reefs remain intact?
Ramón de León is the manager of the Bonaire National Marine Park. He
says the island has an advantage in that it has no industries to pollute the
water.
The island is mostly undeveloped, which means relatively little farm and
lawn fertilizer run-off that can create marine algae blooms. And cool
upwellings in the region help balance the rising ocean temperatures. Warm
oceans can cause coral bleaching, which often kills the coral animal.
But de León says Bonaire really owes its healthy reefs to its history of
conservation laws. They date back to an era when such policies were rare.
“Bonaire start to protect sea turtles and turtle nests in 1961, back when
everybody was promoting sea turtle soups and nailing shells in the walls.”
By the end of the 1970s, Bonaire had banned spear fishing and made it
illegal to damage coral. For years, divers have been required to pay a
sizeable fee and take an orientation course before they’re allowed to dive
on the island. That helps them avoid touching the coral, which can kill it.
De León says the island still allows too much fishing. So several years ago,
he told the island’s fishermen they needed to choose a no-take zone to let
the reefs recover.
“I refuse to decide myself. I give the fishermen some prerequisites that they
have to have to close, and they chose which area. Is not my number-one
option, but is their number-one option. So I have to respect that.”
De León says because the fishermen chose the no-take zone, something
important happened. Compliance is high.
For all of Bonaire’s success in coral conservation, there are still some
problems. De León says its reefs suffer from leaky septic tanks and boat
pollution. And there are few of the large predator fish that used to maintain
population balance on the reefs.
But the island is a haven for researchers like Mark Patterson. He designs
underwater robots at Virginia Institute of Marine Sciences.
Last year he led a NOAA expedition to use robots to map Bonaire’s reefs.
He says the island’s reefs are valuable as a baseline by which other reefs
can be judged.
“If you’re an up-and-coming marine scientist and you go to a lot of the coral
reefs on the planet now, you might think that all coral reefs have always
look like this. And they haven’t! So the fact that we’ve got some pristine
reefs left is very important, and we’ve got to work very hard to protect them
because it shows us how the ecosystem should look and used to look
around the planet before things started to go downhill.”
The penguins' natural shelter (their own dung) is being removed from the landscape for fertilizer. So, conservationists are supplying penguins with artificial homes in which to nest. (Photo by Frank Olivier)
Rows of introduced, igloo-like penguin houses on an island off the coast of South Africa. (Photo by Frank Olivier)
Flocks of penguins nearly cover a small island near South Africa. However, due to habitat destruction, their ability to reproduce has been in danger. (Photo by Frank Olivier)
(Photo by Frank Olivier)
Along with lions and elephants, Southern Africa is home to a species of penguin. But the African penguin population is dwindling – and scientists are trying to turn things around for the bird. Ann Dornfeld reports:
Transcript
Along with lions and elephants, Southern Africa is home to a species of penguin. But the African penguin population is dwindling – and scientists are trying to turn things around for the bird. Ann Dornfeld reports:
Dyer Island sits just off the coast of the Western Cape of South Africa. It’s tiny, and pretty much consists of two things. Rocks. And birds.
Along with Cape cormorants, Hartlaub’s gulls and swift terns, Dyer Island is the nesting ground for hundreds of African penguins. Although they’re half the size of the Emperor penguins from that movie you might have seen, the species act a lot alike – waddling, awkwardly hopping, and squawking at each other over territory disputes. But today, these African penguins aren’t doing much of anything. That’s not them you hear. They’re mostly just standing still, trying to catch a breeze in the 90-degree heat.
“If you have a look here, you get an idea of just the heat stress of the birds. See this bird over here who’s just sort of standing, gasping, that’s an indication of heat stress.”
Lauren Waller monitors the penguin colony for Cape Nature. That’s the provincial conservation department. Waller says penguins used to find protection from the heat by burrowing into centuries’ worth of bird guano. That allowed them to keep cool, and lay their eggs out of predators’ reach. But in the 19th and 20th centuries, people dug out the guano between the rocks along the Southern Africa coast and sold it as fertilizer.
“And now what you’ve got if you have a look around the island is just – it’s rock, and the penguins can’t burrow into that. And so it now forces them to breed on the surface.”
When penguins make their nests out in the open, kelp gulls can snatch their eggs and chicks. And because penguins breed during African summers, the heat can be overwhelming. Parents often leave the nest just to cool off at sea, and their eggs or chicks die. It will take decades for the guano to build back up.
Scientists are trying to help the penguins out. They’re building nests for them. Waller says Dyer Island is the main testing ground.
“The nests are made out of fiberglass mold and they sort of mimic natural burrows that the bird would make in the ground. They’re kind of like a really small igloo shape, and big enough that you can fit two adult birds inside and their chicks as well.”
The nests are covered with rocks to prevent a greenhouse effect inside the igloos. Waller says they’re experimenting with different materials and nest arrays to see whether the penguins prefer their igloos in a cul-de-sac pattern, or a secluded ocean view. Some nests never catch on, but others have become prime real estate.
“Here you can see we have a colony of 15 nests, and already nine of them are occupied and it’s not their peak breeding yet. So this specific colony is looking really, really good.”
We peek inside one of the plastic igloos where a mother is guarding two fuzzy brown chicks.
“She’s turning her head from side to side.”
“Yeah, it’s a kind of aggressive, stay-away kind of behavior. But if you look behind her you can see the little heads sticking out!”
Waller says as successful as the artificial nests have been, commercial overfishing of sardines and anchovies also affects chick survival. At one well-protected nest a few yards away, she finds an abandoned egg and a dead chick. She says it may be that the parents couldn’t find enough fish.
“It is hard. Knowing their numbers are just going down every year. And you become quite desperate to do something so that these birds don’t have these breeding failures.”
The South African government has banned fishing around one island with penguin colonies to see whether it makes a difference in the birds’ survival rates. Waller says she’s hopeful that now is the turning point for African penguins.
A NOAA scientist surveying an oiled beach to assess the depth of oil
penetration soon after the spill (Photo courtesy of NOAA)
Twenty years ago this week, an oil tanker ran aground on a rocky reef in Alaska’s Prince William Sound. The Exxon Valdez spilled more than 11 million gallons of crude oil. It’s considered to be perhaps the biggest ecological disaster in US history. Ann Dornfeld has this look at how oil spill prevention and preparedness have changed in the two decades since Valdez:
Transcript
Twenty years ago this week, an oil tanker ran aground on a rocky reef in Alaska’s Prince William Sound. The Exxon Valdez spilled more than 11 million gallons of crude oil. It’s considered to be perhaps the biggest ecological disaster in US history. Ann Dornfeld has this look at how oil spill prevention and preparedness have changed in the two decades since Valdez:
The call came in just after midnight.
“Ah, evidently leaking some oil and we’re gonna be here for a while.”
Court records indicate Captain Joseph Hazelwood was likely drunk when the Exxon Valdez ran aground.
There was hardly any clean-up equipment on hand. No plan for action. The location was remote.
Oil polluted a stretch of Alaskan coastline the length of the entire west coast of the U.S. The oil killed fish, sea otters, harbor seals and an estimated quarter of a million birds. Today, there is still oil on some beaches.
Twenty years later, a cargo vessel has just reported a spill of 160
gallons of oil in Washington state’s Commencement Bay. Investigators
have filled the “Spill Situation Room” in the state Department of Ecology.
“Who’s responsible for actually maintaining
the bow thruster, when was the last time they performed maintenance on it?”
“You mean one of the staff on board?”
“Yeah.”
Spill Response Manager David Byers says coastal states learned a lesson from Exxon Valdez, and developed rapid response systems like this.
“We’ve got crews headed up in a helicopter to do on-
water observations, we’ve got response resources on the water headed out to do containment when we find the location of the oil.”
Byers says the state handles dozens of spills this size each year, making it somewhat of a well-oiled machine.
After the Exxon Valdez, the state of Washington put in place some tough prevention standards. But the U.S. Supreme Court ruled against the state.
The court ruled the state was making safety demands of oil companies that only the federal government could make.
Mike Cooper is Chairman of the state’s Oil Spills Advisory Council. He says that ruling is one reason why small oil spills are common in Washington’s bays. He says other states have come up against the same restrictions.
“When the Massachusetts legislature passed strict laws,
the United States Coast Guard and the industry did the same thing that they did to the people of Washington state. They sued the people of the state of Massachusetts and said, ‘We’ll decide if industry has to pay.'”
The federal Oil Pollution Act did raise industry’s liability and the amount of federal money available in the event of a spill. It also requires oil tankers and barges in U.S. waters to be double-hulled by 2015. The Exxon Valdez’ single hull was easily gouged open when it ran aground.
Today, most U.S.-flagged tankers and barges are double-hulled. Most foreign tankers aren’t yet.
But there’s no law requiring a second hull on cargo ships. Bruce Wishart is Policy Director for People for Puget Sound. He says it’s cargo vessels that are most likely to spill oil.
“It’s commonly assumed that oil tankers pose the
single greatest threat in terms of an oil spill. There are actually many, many more cargo vessels plying our waters that pose a very significant risk simply because they carry a lot of fuel on board.”
In 2007, the cargo vessel Cosco Busan spilled 53,000 gallons of oil into San Francisco Bay. Thousands of birds died, including endangered species. A fully-loaded cargo ship can contain 40 times more oil than what leaked from the Cosco Busan.
So, while oil tankers have become safer in the two decades since the Exxon Valdez, the nation’s waterways still remain at risk of a major spill.
Some consumers choose alternative treatments, like acupuncture, because they want a smaller environmental footprint from their medical care. (Photo courtesy of the National Institutes of Health)
Acupuncture has been used as a medical treatment in Asia for thousands of years. It’s catching on in this country, but it can be pricey. Now a new kind of low-cost acupuncture clinic is springing up with a goal of bringing acupuncture to the masses. As Ann Dornfeld reports, this new type of clinic might just be healthy for the planet, too:
Transcript
Acupuncture has been used as a medical treatment in Asia for thousands of years. It’s catching on in this country, but it can be pricey. Now a new kind of low-cost acupuncture clinic is springing up with a goal of bringing acupuncture to the masses. As Ann Dornfeld reports, this new type of clinic might just be healthy for the planet, too:
Esther “Little Dove” John is lying on a treatment table with the same blissful smile as someone who’s just had a massage. Except she’s about to get stuck with a couple dozen needles.
“Anything in particular you want to focus on today?”
“I have tingling in my fingers and numbness in the toes.”
Acupuncturist Jordan Van Voast taps fine steel needles into John’s hands; then her stomach, her legs, and her ears.
“All of a sudden, my body just relaxed.”
This would be a typical scene from an acupuncture clinic. Except the recliner that serves as John’s treatment table is just one in a circle of ten. It’s a treatment model called “community acupuncture.”
Jacque Larrainzar is getting treated in a chair across from John. She used to go to a standard acupuncture clinic with private rooms. But she prefers the communal style of this Seattle clinic, called – wait for it – “CommuniChi.”
“The feeling is very different. Seeing other people relax and just giving themselves the opportunity to heal is, in itself– I think it helps you to focus on yourself and heal.”
Community acupuncture clinics are designed to make acupuncture affordable to people at all income levels, regardless of insurance. Patients pay a sliding scale fee – as little as 15 dollars per treatment. It’s 60 dollars or more at a standard acupuncture clinic. Community acupuncture keeps costs down through low overhead: using one treatment room and recliners cuts down on electricity and laundry costs. And CommuniChi co-owner Serena Sundaram says that also means a smaller environmental footprint.
“All of those things are really different even than a regular acupuncture clinic, which is already a smaller footprint than a Western practice.”
You don’t need big, high-tech equipment for acupuncture or even electricity — just a place to lie down and a handful of tiny needles.
Patient Esther “Little Dove” John says she’s glad that acupuncture doesn’t involve pharmaceuticals.
“If I were using the mainstream treatment for my condition, I’d be expelling those chemicals into the environment and the fish would be taking it and the birds would be drinking it.”
Scientists have found high levels of pharmaceuticals in the water downstream from water treatment plants. They’re worried about the effect on fish.
Emily Wong is a physician at the University of Washington Medical Center. She practices Western medicine, but also studied acupuncture. Wong says there’s extensive evidence that acupuncture helps with a lot of health problems where Western medicine falls short, like headaches, back aches, and nausea.
But, she says acupuncture is no panacea. She says some acupuncturists claim to be able to treat conditions like kidney stones without scientific evidence to support their claims.
“I see it as being more similar to, for example, physical therapy as a modality that treats many conditions quite well, and as an alternative to a surgical approach or perhaps a pharmacological approach to some conditions.”
If acupuncture works as well or better than a stay at the hospital or a prescription of drugs, it could have a lot lower impact on the environment. And if the new community clinics bring more people to acupuncture, it’s possible the earth will get a little relief too.
The state
proposes returning some of the land to its natural marshy state, and using other parts for stormwater
reservoirs. (Photo courtesy of the National Parks Service)
The state of Florida is working on a plan to restore water flow to its troubled Everglades. It wants to
buy a huge sugar grower and the land it owns between Lake Okeechobee and the Everglades. Ann
Dornfeld went out on the lake to find out what’s at stake:
Transcript
The state of Florida is working on a plan to restore water flow to its troubled Everglades. It wants to
buy a huge sugar grower and the land it owns between Lake Okeechobee and the Everglades. Ann
Dornfeld went out on the lake to find out what’s at stake:
The first thing to know about Lake Okeechobee is that it’s not your stereotypical clear blue lake. It’s
shallow, murky, covered with tall grasses, and thick with everything from birds and rabbits to frogs
and alligators.
The lake is about 35 miles wide. It’s known as the ‘liquid heart’ of the Everglades. And Paul Gray is
here to take its pulse.
Paul Gray: “I think it’s a glossy!”
Ann Dornfeld: “What’s that?”
Paul Gray: “A glossy ibis.”
Gray gets excited about birds. That makes sense – he’s the Science Coordinator for the Audubon
Society’s Lake Okeechobee Watershed Program.
It’s his first time out on the lake since the last big storm, and he’s eager to see how it’s doing.
Stormwater is diverted into the lake from development and farmland like the U.S. Sugar fields. That
floods the lake, which has nowhere to drain because it’s surrounded by a dike.
The best way to get to the middle of a marshy lake is an airboat.
(sound of airboat starting up)
As the boat zips across the grassy lake on a cushion of air, brightly-colored bugs and tiny green frogs
the size of your thumbnail land inside.
Once we skid to a halt, Paul Gray scans the water, and throws up his hands, disappointed.
“We’ve stopped in an area that’s probably four feet deep now. This is very, very sparse – just a little
stem sticking up every four to five feet. If everything was working right this would be all vegetated,
full of birds and stuff. Right now I’m not sure what will happen to it. [sighs] It’s a little demoralizing
right here, but we’ll look for some better spots.”
All this vegetation drowned in the last big storm.
“All of Okeechobee’s water used to flow into the Everglades, but now it doesn’t do that anymore.”
Instead, extra water is dumped into the fragile estuaries. They’re supposed to be a delicate mix of
saltwater and freshwater. And dumping all that lake water into them destroys the ecosystem.
“And the great tragedy is in 2004-2005 we had so many storms, and we dumped so much water
from Lake Okeechobee that we could’ve met all our water needs for a decade. The year after dumping
all that water out, we were in a severe drought and the farmers were only getting 45% of the water
they wanted.”
Last summer, the state of Florida announced a tentative deal with U.S. Sugar Corporation to buy the
company out. U.S. Sugar’s land blocks the flowaway between the lake and the Everglades. The state
proposes returning some of the land to its natural marshy state, and using other parts for stormwater
reservoirs. Gray says the U.S. Sugar deal would be a huge boon to the lake and the Everglades. It
could even improve the birdlife in northern states and Canada that fly south for winter.
“When those little warblers and things reach Florida, they’ve gotta get fat. They need to double their
body weight before they fly across the Gulf of Mexico, or they can’t make it!”
We arrive at a shallower part of the lake, and Gray pumps his fist in victory.
“This is much better news. We’re sitting in a big patch of green plants with little white and pink
flowers. It goes on for several hundred yards. This is called smart weed. It produces little very hard
black seeds. And ducks love these seeds, and migratory seed-eating birds like sparrows and other
things love these seeds. When all of the wintering waterfowl get down here they’re gonna have a ball
with this! [laughs] Wow. That’s nice. Alright, we can go.”
It’s a small success. But Gray says until the flow of water into Lake Okeechobee is returned to normal,
the liquid heart of the Everglades will be struggling to beat.
A net drags floating algae toward the boat
(Photo by Ann Dornfeld)
Guiding algae into the funnel
(Photo by Ann Dornfeld)
Blue Marble Chief Scientist James Stevens checks that the pump isn't sucking up animals, too
(Photo by Ann Dornfeld)
The residents of Dumas Bay hate the smell of algae rotting on their beach
(Photo by Ann Dornfeld)
Algae is attracting a lot of
attention and investment as an alternative
energy source. It grows quickly, contains
a lot of oil, and doesn’t take up valuable
farmland. Ann Dornfeld profiles one company
that’s trying to turn algae into fuel:
Transcript
Algae is attracting a lot of
attention and investment as an alternative
energy source. It grows quickly, contains
a lot of oil, and doesn’t take up valuable
farmland. Ann Dornfeld profiles one company
that’s trying to turn algae into fuel:
I’m standing on a pontoon boat floating just a few feet off the shore of a saltwater bay.
Two men are standing in the waist-deep water around the boat. They’re guiding a layer of
floating algae into a funnel that’s sucking the algae into a burlap bag.
(sucking sound)
It’s an algae harvest – and James Stevens is directing the process. He says they
have to be careful not to suck up young salmon or other animals along with the
algae.
“This junction can be turned on, and it allows me to feed water into a box where
then I can sort and make sure there’s no by-catch actually coming through the
system.”
Stevens is Vice President and Chief Scientist of Blue Marble Energy. It’s
a Seattle start-up trying to turn algae into fuel. Most algae-to-energy researchers
are growing algae in giant tanks. Blue Marble has a different plan: gather algae
that’s already growing in noxious blooms along coastlines.
(sound of waves)
Here in Dumas Bay, not far from Seattle, huge blooms of algae often rot in the
water. That process uses up oxygen and kills marine life. And when the dead algae
washes up on the beach, it creates a smell the neighbors hate.
Blue Marble President Kelly Ogilvie says these algae blooms are common
around Puget Sound – but that’s nothing compared to more polluted waterways
elsewhere in the world.
“And the most recent, I think, salient example was Qingdao, China. And the
bloom that occurred there was, I think, like 800 square miles and they pulled a
million tons out of the water and that is prologue to what is going to be happening
on coastlines across the planet.”
Warmer water can help algae grow, and some scientists think global warming is
contributing to an increase in gigantic blooms. Nutrients from sewage dumping
and fertilizer runoff from farm fields and lawns also help algae flourish.
“If you think about what is actually happening in our oceans, the algae bloom
crisis has just begun. And if we can find a way to turn that new crisis into a
solution to something else, by goodness we’re going to try and make a go at it.”
Most companies doing algae-to-energy research focus on creating biofuels for cars
or jets. Instead of liquid fuel, Blue Marble wants to convert algae into natural gas
and biochemicals.
Along with private investment, Blue Marble has a contract with the Washington
Department of Ecology to collect algae at two bays in Puget Sound.
The department’s Alice Kelly is watching today’s harvest from the beach. She says
her agency hopes this gets rid of the rotten egg smell neighbors have been
complaining about without hurting the ecosystem, the sealife near the shore.
“It’s very important to protect that habitat. So we’re walking a very fine line here
between trying to deal with the excess odor problem and protect the near shore.”
Blue Marble’s approach provides that protection, she says, because its operation is
based just offshore. They aren’t dragging equipment across the beach. And today,
it looks like the only by-catch has been other species of algae.
But some conservationists have big concerns about harvesting wild algae for fuel.
One of them is Kevin Britton-Simmons, a researcher at
the University of Washington. He says a lot of unnatural algae blooms could be
prevented by keeping fertilizer and other pollutants out of the water.
“I feel this is essentially exploiting the problem instead
of fixing it. I’m concerned if we allow a business to develop that’s dependant on
this problem, what’s gonna happen when we fix the problem? Will there then be
pressure for this business to harvest natural populations of algae?”
Natural blooms are a valuable part of the food web, and he says removing them
could rob marine life of a major food source. He says it’s also hard to distinguish
between natural algae blooms and those caused by pollution.
(sound of waves)
Back on Dumas Bay, Kelly Ogilvie says his company has netted nearly 10,000 pounds of algae from the two harvests it’s completed. The next step is to
use bacteria to break down the algae into natural gas and various chemicals.
If all goes as planned, Ogilvie says Blue Marble’s first batch of natural gas will be
ready any day now.
The research team collects several samples from each stop along the route to measure the chemical composition of the ocean water. (Photo by Ann Dornfeld)
It’s called Milking the Cow – the team drops bottles to the ocean floor to take samples... then they retrieve the bottles and pour the contents into lab bottles. (Photo by Ann Dornfeld)
We hear a lot about carbon dioxide in the atmosphere. But half of all man-made CO2 is stored in the world’s oceans. When CO2 mixes with water, it increases the oceans’ acidity. As Ann Dornfeld reports, that acidification is moving closer toward the oceans’ fragile coastal areas:
Transcript
We hear a lot about carbon dioxide in the atmosphere. But half of all man-made CO2 is stored in the world’s oceans. When CO2 mixes with water, it increases the oceans’ acidity. As Ann Dornfeld reports, that acidification is moving closer toward the oceans’ fragile coastal areas:
If you’ve ever wondered why sparkling water tastes tangy, instead of just bubbly – it’s because of carbonic acid. That’s what’s produced when carbon dioxide is added to water. Some of the CO2 in the world’s oceans is natural, from things like decaying algae. But the oceans also soak up CO2 produced by cars and factories. Once CO2 is absorbed into the ocean, it sinks to the coldest, deepest water for long-term storage.
Chemical oceanographers at Oregon State University are monitoring the chemical composition of the Pacific Ocean to see where the carbon is being stored. On a research vessel several miles off the coast, they lower a series of bottles down to the ocean floor on a winch.
(sound of winches)
Scientists have expected that upwellings would eventually bring some of that CO2 to the coastal zones that are home to a huge array of marine life. They thought it would take a century or more. But a recent study, published in the journal Science, found acidic water fewer than 20 miles off the Pacific Coast.
Grad student Rachel Holzer says that’s alarming.
“The ocean is normally at a very stable pH. It is a buffered system, which means it is not very easy for the pH to change. But recently there’s been evidence that ocean acidification is happening, meaning that the pH is dropping. And that can be very harmful to biological life of all different types.”
Corrosive water can dissolve the calcium carbonate shells of barnacles, mussels, oysters and clams. Coral reefs are also calcium carbonate. So are a lot of planktonic species, including terrapods. Those make up about half of the diet of young salmon.
Burke Hales co-authored the latest study. He’s an Associate Professor of Chemical Oceanography at Oregon State.
“The question is how are these organisms going to respond, you know? Do their shells dissolve, do they just not grow as quickly? If their shells are negatively impacted, are the organisms themselves negatively impacted? And if the organisms are negatively impacted, how does that cascade through the food web?”
Hales says stopping ocean acidification would be extremely difficult, if not impossible.
“There are people who have talked about going out in the ocean and spraying sodium carbonate pellets into the water, which would dissolve and neutralize some of the carbonic acid. Sort of like when you take a Tums, that’s the active ingredient in Tums is calcium carbonate. That’s one idea that’s been proposed. It’s really, really speculative that that would work.”
What’s more, Hales says the process of hauling all of that ocean antacid out to sea and dispersing it could produce as much CO2 as it would neutralize.
“It is depressing. We wish things weren’t this way and moving sort of irreversibly towards worse conditions. But we also know that the oceans do have a lot of ability to adapt. And what we don’t know yet is exactly how this is gonna play out.”
One thing scientists do know is that the acidification has just begun. The corrosive water they found right off the Pacific Coast was from carbon dioxide released about 50 years ago. And over the last half century, CO2 production has only increased.
Researchers have found that the Pacific Ocean is becoming increasingly acidic as a result of CO2 emissions (Photo by A. Kalvaitis, courtesy of NOAA)
The Pacific Ocean is becoming more acidic.
The corrosive water could start dissolving shells
and coral. The problem is largely caused by carbon
dioxide emitted by cars and power plants. As Ann
Dornfeld reports, researchers say the problem is
happening faster than they expected:
Transcript
The Pacific Ocean is becoming more acidic.
The corrosive water could start dissolving shells
and coral. The problem is largely caused by carbon
dioxide emitted by cars and power plants. As Ann
Dornfeld reports, researchers say the problem is
happening faster than they expected:
Scientists have known for a long time that the world’s oceans are becoming corrosive
from so much man-made CO2. Carbon dioxide dissolves into the ocean, and forms
carbonic acid.
The corrosive water is concentrated in deep, cold parts of the ocean. Scientists had
predicted it would approach the vulnerable coastal zones in about a century. So they
were alarmed to find the acidity just a few miles off the California coast.
Burke Hales is a chemical oceanographer. He says this corrosive water could break
down the calcium carbonate in coral and shells.
“So we’re talking about things like barnacles and oysters and mussels and
clams. And some planktonic organisms form calcium carbonate shells, as well.”
Researchers say the acidification approaching the coasts is from CO2 that was emitted
50 years ago. That means we’re just at the start of increasingly acidic oceans.
A colony of tunicates in Guam (Photo by David Burdick, courtesy of NOAA)
Slimy, hungry invaders are moving through
the waters off the Northwest coast of the US.
They’re called invasive tunicates –
or sea squirts. And they’re the same invasive
species that devastated shellfish farms on Canada’s
east coast. If invasive tunicates aren’t controlled,
you could see a lot of seafood options disappear
from markets and menus. Ann Dornfeld has the story:
Transcript
Slimy, hungry invaders are moving through
the waters off the Northwest coast of the US.
They’re called invasive tunicates –
or sea squirts. And they’re the same invasive
species that devastated shellfish farms on Canada’s
east coast. If invasive tunicates aren’t controlled,
you could see a lot of seafood options disappear
from markets and menus. Ann Dornfeld has the story:
It’s a peaceful spring morning at this suburban marina. But beneath the water’s surface, a hunt is
underway.
(water sounds)
Professional divers – like Jesse Schultz with the Washington Department of Fish and Wildlife – are
combing the docks for invasive tunicates. They don’t have to look far.
“That’s one of the tunicates right there – that’s the guy right there.”
Schultz surfaces holding a jelly-like tube. Sea squirts compete with everything from clams to tube
worms for the plankton they all eat. The sea squirts usually win, because they don’t have native
predators. Three species came here from Asia, probably on boat hulls. Today, divers are cleaning
the hulls of local boats to keep the sea squirts from spreading.
Allen Pleus manages invasive species for the state.
“The whole intent right now is a containment action. We want to prevent any of these boats
from leaving this harbor with the tunicates attached to their bottom, going to another
harbor, and infesting that harbor or marina.”
When invasive tunicates get to a new harbor, they quickly become the dominant species. In the
warm part of the year, they spawn every 24 hours. And along with hogging the food supply, one
species of sea squirts forms a slimy mat that smothers mussels and other shellfish.
Pleus says if tunicates get out of hand, they could make a big impact on the seafood industry.
“It can definitely affect especially shellfishing in this area. Puget Sound, Western Washington is one of
the largest producers of shellfish in the nation. It could also affect other populations of
food fish, including salmon, by taking out a lot of the nutrients that juvenile salmon feed
on.”
Nova Scotia learned that lesson the hard way. Pleus says in Eastern Canada, entire shellfish
farms were recently wiped out by invasive tunicates.
“So the rap sheet is clear. They can grow to exponential sizes, quantities and smother
aquaculture facilities. They can’t even lift up their lines it’s so heavy with these critters on
it.”
To prevent the same thing from happening here, the state workers have to move quickly – and
they have to be thorough.
“Here’s another bag, Justin!” (splashing sound)
Back in the water, diving biologist Jesse Schultz has his hands full with a boat that has apparently
been docked for seven years. Its tabs show that’s the last time it was registered.
“This guy’s getting a free boat cleaning, sort of!”
The state is trying to scrape clean every infested boat in Puget Sound before the summer boating
season. But Schultz says because the docks are still covered with invasive tunicates, they’ll grow
back on this boat if the owner doesn’t keep it clean.
“That’s the biggest thing these guys can do to keep these things from spreading is have
their boats maintained.”
The state is still figuring out the best way to clean the docks. So far biologists have cleaned only
one entirely. When they were done, they’d removed ten tons of critters.
Unfortunately, Allen Pleus says only some of those were tunicates. In order to get rid of the
invasive sea squirts, they have to employ a sort of scorched earth policy.
“That is one of the hardest parts of this is that we have to basically take everything out.”
That means the good with the bad. We sift through a bucket of the creatures scraped from the
dock. Along with plenty of invasive tunicates, there are brightly colored sea cucumbers, scallops,
mussels, rock oysters, feather duster worms and chitons – exactly the kinds of animals the state
is trying to protect. They have to destroy the habitat in order to try to save it.
A jellyfish under the Ross Sea ice, on October 14, 2005 (Photo by Henry Kaiser, courtesy of the National Science Foundation)
