Tuesday, December 15, 2015
Scientist have described the process that allows corals to form skeletons, and they say water acidity doesn’t affect the process.
Those skeletons—destined to become limestones—form massive and ecologically vital coral reefs in the world’s oceans.
In a publication in Current Biology, Tali Mass and colleagues at the Rutgers Institute of Marine and Coastal Sciences show that specific proteins produced by corals can form limestones in test tubes.
These proteins, secreted by corals, precipitate carbonate that forms the corals’ characteristic skeleton.
"This is a first step toward understanding how coral build their skeleton," says Mass, a postdoctoral researcher and lead author of the study.
Water acidity does not affect the process, which suggests that these organisms will survive in coming centuries when the world’s oceans are predicted to become more acidic. That also potentially bodes well for the health of the world’s coral reefs, which support ecosystems essential to marine diversity that in turn support fisheries.
"The good news is that the change in acidity will not stop the function of these proteins," says Mass.
But she is quick to warn that her work shouldn’t make people complacent. "Pollution and rising water temperatures also pose major threats to these essential marine organisms."
Limestone rocks are all around us and have been central human history. The Egyptians used them to build pyramids and today they are still used to build monuments.
Surprisingly, all limestones are created by living organisms. The rocks are everywhere, it seems, but how they form has not been answered until now.
Scientists have long known that corals made their external skeletons from a matrix of secreted proteins, but didn’t understand the mechanism.
Mass and colleagues began by asking which proteins might be responsible for the process. They identified over 30 proteins from coral skeleton that could be involved. They described that work earlier this year in the Proceedings of the National Academy of Sciences.
At the same time they searched for genes in the coral genome for proteins that could potentially assist with production of the skeletal mineral calcium carbonate.
For this, the scientists went to Debashish Bhattacharya, professor of ecology, evolution, and natural resources, director of the Rutgers Genome Cooperative, and a co-author of the paper. A genome is the entirety of an organism’s genetic information (DNA)—in this case, of the particular coral that the researchers were studying.
"We produced a ‘draft’ genome," Bhattacharya says. "Basically, that’s a genome that is not yet fully assembled into chromosomes. So, you don’t have the DNA puzzle completely put together, but you have all of the pieces of that puzzle and can figure out what the many pieces—for example, the genes—do in the coral."
The genome analysis, done by Ehud Zelzion, bioinformaticist at the Genome Cooperative, led the researchers to four particular proteins. The genes encoding these proteins were cloned and expressed in bacteria, then isolated and placed in solutions representing the current acidity of seawater and the more acidic levels scientists predict for the end of the century.
On the commonly used pH scale, where lower numbers are more acidic, today’s seas are a moderately alkaline 8.2. But they are expected to creep toward 7.6 as carbon dioxide concentration increases in the air.
Using a scanning electron microscope and other measurement devices, the scientists examined the proteins and found that all had begun to precipitate calcium carbonate crystals in the test tube at both pH levels.
"This work goes a long way toward explaining how corals precipitate calcium carbonate skeletons and clearly shows that the reaction can work at more acidic pH levels," says Paul Falkowski, also a co-author of the study and professor of geological and marine sciences. "It doesn’t mean that ocean acidification is not a concern, but it does suggest that corals will still be able to form skeletons, and coral reefs will continue to exist."
Friday, October 16, 2015
When NOAA announced today that a global bleaching event is occurring, scientists took notice. coralWhen they wrote that it was the third-worst global coral bleaching event, headlines started blaring "devastating" and "dramatic." But the facts about coral bleaching are usually set aside in the rush to make headlines, and when it comes to the National Oceanic and Atmospheric Administration (NOAA), you really do have to pay attention to what they are declaring. Especially under this current administration.
As we first reported here, NOAA announced in early July that coral reefs are dying off at an unprecedented rate, even though a recently published paper showed that these statements are more alarmist than accurate. Coral reefs can turn white when the algae that surrounds them dies off from too warm (or too cold) water, and the satellites detect that thermal stress. But the paper published in Marine Biology showed that while even though some corals appear bleached, it doesn't mean they are dead or even dying. Why?
Conventional tracking methods (like NOAA's 5-km Coral Reef Watch Satellite Monitoring) can't distinguish between white and bleached (dead) colonies. The paper, by Cruz et al, showed that "although bleaching leaves the coral skeleton visible under its transparent tissue, not all white coral colonies display this feature," which "raises the question as to whether all 'white'-shaded colonies are indeed bleached." To determine whether bleached coral is actually dead, Cruz et al actually sampled coral off the east coast of Brazil, and found that white corals exhibited the same lifelike features as their multi-colored cousins.
Because the white (bleached) corals were physiologically healthy when compared to dark and light-browned colonies, the paper says this would lead to the "overestimation of coral bleaching" by nearly twice as much. This overestimation is caused because satellite monitoring of coral is unable to detect between white living colonies and bleached dead colonies. In fact, surveys off the coast of Brazil showed that the "proportion of bleached and white colonies is similar, thus suggesting that current coral reef surveys may be overestimating the bleaching" by nearly twofold.
So it's surprising to read that Mark Eakin, a NOAA Coral Reef Watch coordinator, told the Associated Press that, "We may be looking at losing somewhere in the range of 10 to 20 percent of the coral reefs this year. The bad news for the U.S. is we're getting hit disproportionately just because of the pattern of the warming." Eakin also called the bleaching a crisis, blaming it first on global warming, and then secondly on natural variability.
Any anomalous ocean warming in the Pacific can be directly linked to the enormous warm blob near Hawaii and a persistent El Niño first announced in June by NOAA. Neither of these two events have anything to do with climate change or atmospheric warming and have been studied extensively by scientists since first discovered.
"Hawaii is getting hit with the worst coral bleaching they have ever seen, right now," Eakinsaid. "It's severe. It's extensive. And it's on all the islands." That's according to satellite imagery as well as computer model forecasts. Eakin didn't actually travel to Hawaii and investigate all the reefs around all the islands, but instead relied on their Coral Reef Watch satellite monitoring system, which the aforementioned paper indicated does a disproportionate job of indicating dead coral reef that's still alive.
Another factor is that other bodies of water, such as the Atlantic Ocean, are showing anoverall cooling trend. Even NOAA's sea surface temperature (SST) anomaly map shows far less warming in the areas where the coral reefs are supposedly dying off. Keep in mind thatin 2010, "cold water temperatures in the Florida Keys caused a coral bleaching event that resulted in some coral death." During that event, water temperatures dropped 12.06 degrees Fahrenheit lower than what they normally are for that time of year.
While no one disputes that warmer water, a byproduct of an El Niño event, can cause some coral to die off, no one fully understands why El Niños form in the first place. Based on historical marine records, El Niños have been documented when people began sailing the world in earnest over 500 years ago. Plus the current Pacific warm blob has been determined to be completely unrelated to global warming and simply a consequence of natural variability. One study, by Washington's state climatologist Nick Bond, showed how the blob has been behind the nearly five-year-long drought in California.
Even as NOAA inarticulately proclaims this die-off as the third ever [sic] global coral bleaching event, they are basing that announcement on measuring instruments that have already been proven to overestimate so-called coral bleaching twofold. They are also making this statement in lieu of the fact that they have only been monitoring coral reef bleaching since 1989, when "a relatively new ocean phenomenon called 'coral bleaching' was increasingly observed in parts of the Caribbean Sea."
Under the supervision of former Vice President Al Gore, the Coral Reef Watch Program took shape and was formally established in 1998 when President Clinton "issued an Executive Order that created the U.S. Coral Reef Task Force." Using satellite data from 1985 to the present, the program created "historical" recreations of the past, allowing NOAA to declare that this "may" be the third-largest global coral bleaching event "on record."
Put another way, coral bleaching events have been occurring for millions of years based on marine and fossil records. Unsurprisingly, the only thing new about this bleaching event is that agencies tasked with environmental initiatives are making a lot of noise just ahead of the Paris Climate Talks, where a climate change treaty is expected to emerge. A quick visit to the NOAA's climate reef watch website shows it devoted entirely to global warming. Unfortunately for U.S. citizens, all of this propaganda comes at taxpayer's expense.
Friday, October 9, 2015
Major coral bleaching crisis spreads worldwide (?)
This utter bulldust is typical of SETH BORENSTEIN -- though he appears to have been suckered by NOAA operatives. Warm water is NOT bad for corals. They are in fact at their most vigorous and diverse in very warm seas like the Torres strait -- which is not far from the equator (at 10.5 degrees South; Hawaii is 21 degrees North). The warmer the water, the happier the coral. A warmer world would have MORE coral. Periodic bleaching does occur but it is not well understood. All we know is that corals always bounce back from it fairly rapidly. You can drop a hydrogen bomb on coral and it will recover. It did at Bikini Atoll
The bleaching of colorful coral is spreading into a worldwide, devastating crisis, scientists say, and they predict it will likely get worse.
Triggered by global warming and the El Nino, record hot ocean water is causing fragile coral to go white and often die, threatening picturesque reefs that are hotspots of marine life, experts say.
The spread of sickly white started more than a year ago in Guam, then devastated Hawaii, infected the rest of the tropical Pacific and the Indian oceans and has now infested Florida and the Caribbean. On Thursday, the National Oceanic and Atmospheric Administration and international reef scientists pronounced it a global coral bleaching event, only the third in recorded history.
No place with coral has been spared, though some regions — such as Hawaii — have been hit harder than others, experts said. Excessive heat stresses the living coral, which turns white and then becomes vulnerable to disease.
"We may be looking at losing somewhere in the range of 10 to 20 percent of the coral reefs this year," NOAA coral reef watch coordinator Mark Eakin said. "The bad news for the U.S. is we're getting hit disproportionately just because of the pattern of the warming."
He called bleaching a crisis, especially with worsening global warming forecast for the rest of the century: "If that's not a crisis, what is?"
Eakin said he's especially concerned about Hawaii, which already suffered through bad bleaching in 2014.
"Hawaii is getting hit with the worst coral bleaching they have ever seen, right now," Eakin said. "It's severe. It's extensive. And it's on all the islands."
In one part of northwestern Hawaii, "the reef just completely bleached and all of the coral is dead and covered with scuzzy algae."
Florida started getting hit in August. The middle Florida Keys aren't too bad, but in southeast Florida, bleaching has combined with disease to kill corals, Eakin said. It has also hit Cuba, Haiti and the Dominican Republic and is about to hit Puerto Rico and the Virgin Islands, he said.
Warm water causes bleaching and ocean temperatures are at record high levels, partly because of steady manmade global warming and partly because of the El Nino, which is an occasional warming of the central Pacific that changes weather worldwide, Eakin said. Add to that Hawaii's "blob," a pool of warm water that has stagnated in the northeast Pacific.
The last super El Nino, in 1997-1998, was the first global bleaching event. A smaller El Nino in 2009-2010 was the second.
So far the 1998 bleaching was worse, but that was the second year of an El Nino and we're in the first of two years now, Eakin said.
Monday, August 24, 2015
Study shows Pacific island reefs can match rising sea levels
Coral reefs are a lot more resilient than previously thought. At least according to a new study published yesterday that showed Pacific island coral reef can grow fast enough to match rising sea levels, even with increased ocean temperatures. coral reefs
Because they grow vertically on shallow reef flats, researchers observed that Porites microatolls coral is keeping pace with current sea level rise, but may have trouble under the worst-case IPCC scenarios. The Porites microatoll, whose growth is largely lateral and limited by exposure to air, is named for its resemblance to island atolls (see picture).
Researchers at the Florida Institute of Technology, who published their study in the Royal Society Open Science, say their findings provide the first evidence that "well-managed reefs will be able to keep up with sea-level rise through vertical growth." However, if CO2 emissions rise past 670 parts per million (ppm), which may cause ocean temperatures to increase 2.2 degrees Celsius, reefs will have a hard time keeping up with the projected sea level rise.
Currently CO2 levels worldwide are 400 ppm (.o4 percent), but once they cross the 670 ppm threshold, the corresponding rise in ocean temperatures may hamper even a healthy reefs ability to survive. "Reefs will continue to keep up with sea-level rise if we reduce our emission of greenhouse gases," said Florida Tech’s Rob van Woesik, a professor at FIT's Department of Biological Sciences and the study's lead author. "If reefs lose their capacity to keep up with sea-level rise they will drown."
The study, which focused on Palau island in the western Pacific Ocean, was also co-authored by researchers from the University of Queensland and the Palau International Coral Reef Center. Palau is an island country that is part of the larger Pacific island group of Micronesia and relies on the reef system to break apart storm waves.
The researchers measured "570 reef-flat Porites microatolls (a type of coral) at 10 locations around Palau, which revealed recent vertical skeletal extension (78±13 mm) over the last 6–8 years," consistent with the observed increase in sea level. The study's authors then used the Intergovernmental Panel on Climate Change (IPCC) greenhouse-gas concentration trajectories from its 2014 fifth Assessment Report to model four different outcomes for the Porites microatolls. It showed that under the low- to mid-RCP scenarios, reef-coral growth will keep up with sea-level rise."
These IPCC's RCP pathways are primarily used for climate modeling and research and "describe four possible climate futures," depending on how much greenhouse gases are emitted in the future.
However, under the IPCC's worst-case RCP scenario, where "greenhouse gas concentrations exceed 670 ppm atmospheric CO2 levels with a concomitant increase of 2.2 degree Celsius in sea-surface temperatures by 2100," their "predictions indicate that Poritesmicroatolls will be unable to keep up with projected rates of sea-level rise."
CO2 levels have increased at a rate of approximately 2 ppm/year since recordkeeping began. That means if current trends continue, CO2 levels will have increased only 170 ppm by the year 2100, much less than the 670 ppm or higher needed to affect the reef systems described in the study. There is also an annual fluctuation of about ~10 ppm that is negatively correlated with the Northern Hemisphere's growing season (plants absorb CO2 during the spring/summer/early fall).
As reported here, other studies have also shown coral reefs are far more resilient then previously estimated. One 13-year study of coral reefs showed "them spontaneously recovering," refuting the "often doomsday forecasts about the worldwide decline of the colorful marine habitat." Tom Frazer, professor of aquatic ecology at the University of Florida and part of that study, told Reuters, "People have said these systems don't have a chance. What we are saying is: 'Hey, this is evidence they do have a chance.'"
Another study—funded by NOAA—showed that coral reefs can also adapt to warmer ocean temperatures through a variety of processes. Even after the great coral die-off in 1998 from a particular brutal El Niño, most of the coral reefs across the planet rebounded to their original numbers. Coral can also perish from a variety of issues: environmental stressors, such as elevated temperature; changes in salinity; high solar radiation; pollutants; and/or diseases.
This latest study from the Florida Institute of Technology will be good news to the thousands of people who populate these Pacific islands and rely on the intricate reef system for protection and tourists.
Thursday, July 30, 2015
A mystery that is a mystery to Warmists only
In science, when something shows your theory is wrong, you change your theory. In Warmism, if something shows your theory is wrong, it's a "mystery". The finding below shows that coral deaths presently being attributed to warming are NOT produced by warming
AN ancient coral reef specimen now on display at the Natural History Museum in London is at the centre of a global warming mystery spanning 160 million years.
THE exhibit is proof that ancestors of modern corals somehow thrived during the Late Jurassic period when temperatures were warmer and atmospheric levels of carbon dioxide higher than they are today.
Yet global warming in the 21st century is already associated with serious damage to coral reefs caused by "bleaching".
Dr Ken Johnson, coral reefs researcher at the London museum, said: "By researching historical fossil corals like this, we can understand and predict the impact of climate change and other environmental factors on coral reefs over time.
"This 160-million-year-old specimen is an ancestor of some of the corals on our planet today, showing us that a sustainable future for coral reefs is possible because they can survive severe global environmental changes."
Early corals also managed to survive the mass extinction at the end of the Cretaceous period 65 million years ago that wiped out the dinosaurs and many other species.
If greenhouse gas emissions continue unchecked, atmospheric carbon dioxide is expected to match Late Jurassic levels by 2100 and to exceed them by 2250.
Bleaching occurs when stressful environmental conditions cause corals to expel the symbiotic algae living in their tissues, turning them white.
Corals depend for their survival on the algae, which provide them with oxygen and nutrients. When they bleach they begin to starve.
Professor Richard Twitchett, palaeoecology researcher at the Natural History Museum, said: "At the time this coral reef was alive, 160 million years ago, our planet's marine biodiversity was as high as it had ever been.
"The fact that this coral reef lived in a much warmer world shows that if we monitor and control future changes, coral reefs can remain one of the most important ecosystems on Earth."
Monday, July 20, 2015
Australian Federal minister Takes To Twitter To Threaten Green Groups Will Lose Their Charity Status
Federal Queensland Liberal-National Party politician George Christensen has issued what appears to be a veiled threat to non-government organisations to “get the donations in” before a committee he sits on strips environmental charities of their tax-exempt status.
Yesterday, the National Party Deputy Whip grilled environmental groups in the first of a series of public hearings which the House of Representatives Standing Committee on the Environment will stage as it considers whether to strip environmental organisations from receiving tax-free donations.
The Queensland Minerals Council - which has allied itself to Christensen in the debate over how huge new coal mines in the Galilee Basin will affect the Great Barrier Reef - appeared first, yesterday morning.
Then Christensen turned his attention to environmental groups, who he described as “morons” during a technical exchange over whether land should be considered to be part of the Great Barrier Reef’s ecosystem.
Felicity Wishart from the Australian Marine Conservation Society was interrogated by the Queensland MP, whose electorate takes in a swathe of coastline adjacent to the Great Barrier Reef.
“He was questioning me about our commitment to accurate information that wasn’t misleading and then trying to grasp at straws and find something that we had done that was misleading,” Wishart told New Matilda.
The Marine Conservation Society had used an image in its campaign material which superimposed a ‘grab dredger’ over the Calley Valley Wetlands and an image of Abbot Point Port, 25km north of Bowen.
Reportedly, Christensen’s main gripes were that the wetlands are ‘not part of the reef’, and the type of dredge to be used for the Abbot Point Port expansion was ‘suction dredger’, not a ‘grab dredger’.
While maintaining the wetlands are an important part of the reef’s ecosystem, Wishart said that the image of a grab dredger was a metaphor for the “one million cubic metres of dredge spoil… that was to be dumped on the wetlands” under previous plans.
After grilling Wishart about the integrity of her organisation’s campaigning, Christensen took to Twitter insisting “they were caught out fibbing, and the committee will sort these sort of lies out”.
The Australian Marine Conservation Society denounced Christensen for “unparliamentary” behaviour, accusing him of “announcing the outcome of the inquiry before it has concluded”, but Christensen said he was “just reading the tea leaves”.
Christensen has previously attacked “gutless green grubs” and “eco-terrorists” for campaigning to win more stringent protections for the reef and battling against an increase in Queensland’s coal exports, which would pump out emissions roughly equal to those created by the United Kingdom, South Africa, or Italy.
The Member for Dawson, who has questioned widely accepted understandings of climate science, has a history of Tweet-controversy. Last month he was forced into an apology over comments linking the American right to bear arms with a recent court decision which legalised marriage equality across the US.
Yesterday, at the inquiry, groups like the AMCS got the distinct impression Christensen was pressing the gun harder to their temples.
“This sounds very much like a government member of the Inquiry threatening environment groups who have been vocal about issues like dredging, dumping and increased shipping in the Reef’s waters,” said Wishart, who acts as a Great Barrier Reef Campaign Director.
In late March, Wishart’s work was singled out as part of a pack of “extreme greens” working for organisations like “Greenpeace, the Australian Marine Conservation Society, Friends of the Earth, Get Up, and the Environmental Defenders Office” who Christensen said “act like Wormtongue from The Lord of the Rings”.
“That is treason,” Christensen told Parliament, “flying overseas and whispering in the ears of the decision-makers and diplomats who have anything to do with UNESCO and the World Heritage Committee, poisoning their minds on the state of the reef”.
“What treachery,” Christensen said, “to go against the interests of your own nation and your own people for no sound reason at all!”
Monday, July 13, 2015
NOAA's estimate of coral bleaching likely two times too high
Written by Thomas Richard
NOAA sounded the alarm yesterday that coral reefs are dying off at an unprecedented rate, even though a recent paper shows that these statements may be more alarmist than accurate. coral bleachingThe National Oceanic and Atmospheric Administration (NOAA) said multi-yearwarm ocean temperatures are creating conditions that are causing corals to die off and turn white (bleached), and they believe that global warming is the culprit. But a new paper, published in Marine Biology in April 2015, shows that even though some corals appear bleached, it doesn't mean they are dead, as conventional tracking methods can't distinguish between white and bleached (dead) colonies.
The paper, by Cruz et al, says that "although bleaching leaves the coral skeleton visible under its transparent tissue, not all white coral colonies display this feature," which "raises the question as to whether all 'white'-shaded colonies are indeed bleached." To answer that question of whether bleached coral is actually dead, Cruz et al studied different colored specimens of the coral M. cavernosa sampled off the east coast of Brazil, and found thatwhite corals exhibited the same lifelike features as their multi-colored cousins.
Simply put, white corals were physiologically healthy when compared to dark and light-brown colonies, which would lead to the "potential overestimation of coral bleaching" by nearly twice as much. One reason for this overestimation is that traditional coral monitoring is unable to detect between white and bleached (dead) colonies. Video transects from reef monitoring surveys off the coast of Brazil showed that the "proportion of bleached and white colonies is similar, thus suggesting that current coral reef surveys may be overestimating the bleaching of M. cavernosa by nearly twofold."
That didn't stop Mark Eakin, NOAA's Coral Reef Watch coordinator, from saying, "The bleaching that started in June 2014 has been really bad for corals in the western Pacific. We are worried that bleaching will spread to the western Atlantic and again into Hawaii." The announcement from NOAA appears to be part of the Obama administration's ongoing campaign to attribute global warming to any event as it gathers commitments from other countries ahead of the Paris Climate Talks.
NOAA also added that only warm ocean temperatures can cause the widespread bleaching that monitoring has found since last year, but this new paper also contradicts that statement. Coral bleaching, the paper says, "is a physiological mechanism triggered by environmental stress, such as elevated temperature, changes in salinity, high solar radiation, pollutants or diseases." They note that "although bleaching leaves the coral skeleton visible under its transparent tissue, not all white coral colonies display this feature."
Once corals die, they turn "white" and have a bleached appearance. But other studies have shown corals are more resilient then previously estimated. One 13-year study of coral reefs showed "them spontaneously recovering," refuting the "often doomsday forecasts about the worldwide decline of the colorful marine habitat." Tom Frazer, professor of aquatic ecology at the University of Florida and part of the research team, told Reuters, "People have said these systems don't have a chance. What we are saying is: 'Hey, this is evidence they do have a chance.'"
One study—funded by NOAA—shows that coral reefs could even adapt to warmer ocean temperatures through a variety of processes. Even after the great coral die-off in 1998 from a particular brutal El Niño, most of the coral reefs across the planet rebounded to their original numbers.
This isn't the first time that NOAA has used dubious data to justify global warming alarmism. In early June, NOAA rewrote the historical climate record by making it "cooler" so the present appears warmer. Even climate scientists who believe that man is primarily responsible for the planet warming less than one degree Celsius over the last 100 years rejected NOAA's readjustments to hide the 18-year-and-counting global warming hiatus.
Monday, June 15, 2015
Coral not co-operating with Warmist theory
As the ocean absorbs atmospheric carbon dioxide (CO2) released by the burning of fossil fuels, its chemistry is changing. The CO2 reacts with water molecules, lowering the ocean's pH in a process known as ocean acidification. This process also removes carbonate ions, an essential ingredient needed by corals and other organisms to build their skeletons and shells.
Will some corals be able to adapt to these rapidly changing conditions? If so, what will these coral reefs look like as the oceans become more acidic?
In addition to laboratory experiments that simulate future ocean conditions, scientists are studying coral reefs in areas of the ocean where low pH is naturally occurring to try and answer important questions about ocean acidification, which threatens coral reef ecosystems worldwide.
One such place is Palau, an archipelago in the far western Pacific Ocean. The tropical, turquoise waters of the Palau Rock Islands are naturally more acidic due to a combination of biological activity and the long residence time of seawater within its maze of lagoons and inlets. Seawater pH within the Rock Island lagoons is as low now as the open ocean is projected to be as a result of ocean acidification near the end of this century.
A new study led by scientists at Woods Hole Oceanographic Institution (WHOI) found that the coral reefs there seem to be defying the odds, showing none of the predicted responses to low pH except for an increase in bioerosion -- the physical breakdown of coral skeletons by boring organisms such as mollusks and worms. The paper is to be published June 5 in the journal Science Advances.
'Based on lab experiments and studies of other naturally low pH reef systems, this is the opposite of what we expected,' says lead author Hannah Barkley, a graduate student in the WHOI-MIT joint program in oceanography.
Experiments measuring corals' responses to a variety of low pH conditions have shown a range of negative impacts, such as fewer varieties of corals, more algae growth, lower rates of calcium carbonate production (growth), and juvenile corals that have difficulty constructing skeletons.
'Surprisingly, in Palau where the pH is lowest, we see a coral community that hosts more species, and has greater coral cover than in the sites where pH is normal,' says Anne Cohen, a co-author on the study and Barkley's advisor at WHOI. 'That's not to say the coral community is thriving because of it, rather it is thriving despite the low pH, and we need to understand how.'
Friday, June 5, 2015
Coral growth and thriving shows no clear connection to temperature variations
The paper below is not easy for a non-specialist to follow but my heading above sums up its major finding. Global warming won't bother it, in other words
Regional coral responses to climate disturbances and warming is predicted by multivariate stress model and not temperature threshold metrics
Timothy R. McClanahan, Joseph Maina, Mebrahtu Ateweberhan
Oceanic environmental variables derived from satellites are increasingly being used to predict ecosystem states and climate impacts. Despite the concerted efforts to develop metrics and the urgency to inform policy, management plans, and actions, few metrics have been empirically tested with field data for testing their predictive ability, refinement, and eventual implementation as predictive tools. In this study, the abilities of three variations of a thermal threshold index and a multivariate stress model (MSM) were used to predict coral cover and community susceptibility to bleaching based on a compilation of field data from Indian Ocean reefs across the strong thermal anomaly of 1998. Field data included the relative abundance of coral taxa 10 years before the large-scale temperature anomaly, 2 years after (1999–2000), and during the post-bleaching recovery period (2001–2005) were tested against 1) a multivariate model based on 11 environmental variables used to predict stress or environmental exposure (MSM), 2) estimates of the time until the current mean maximum temperature becomes the mean summer condition (TtT), 3) the Cumulative Thermal Stress (CTS) for the full satellite record, and 4) the 1998 Annual Thermal Stress (1998 ATS). The MSM showed significant fit with the post-1998 cover and susceptibility of the coral community taxa (r2 = 0.50 and 0.31, respectively). Temperature threshold indices were highly variable and had relatively weak or no significant relationships with coral cover and susceptibility. The ecosystem response of coral reefs to climatic and other disturbances is more complex than predicted by models based largely on temperature anomalies and thresholds only. This implies heterogeneous environmental causes and responses to climate disturbances and warming and predictive models should consider a more comprehensive multiple parameter approach.
Climatic Change, April 2015
Friday, May 15, 2015
Is Australia's Great Barrier Reef 'In Danger'?
If I have the time I do sometimes read Australia's far-Left "New Matilda". I would like to start a blog that regularly demolished their articles -- perhaps to be called "Walzing New Matilda" -- but I have weightier matters to spend my time on. Anyway, the article below is up to its usual standard of presenting only half of the story. Balance is the Devil incarnate to Leftists.
Some scientists do say that the GBR has shrunk by 50% but the interesting question is why there has been any shrinkage at all. The Warmist below knows why, of course. It's because of global warming. Pesky that there has been no global warming for 18 years though. Can something that does not exist cause anything? They also seem to think that Richard Branson is a climate scientist. Enough said on that.
The key point, however, is that the reef does get heavily impacted by natural events such as the many cyclones that have hit North Queensland in recent years. Cyclones are very destructive of coral. HOWEVER, when we look at that storm destruction, we also find that corals grow back rapidly. While that happens, the GBR is in no "danger". Any changes are temporary. See here and here, for instance.
Warmists will say that the cyclones were caused by global warming but again I ask: Can something that does not exist cause anything?
Billionaire Richard Branson has urged the United Nations to list the World Heritage value of the Great Barrier Reef as ‘in danger’ after being approached by advocacy group 1Million Women.
While admitting the campaign may seem “counter intuitive”, Branson argues it is an effective way to “stop further irreversible damage” to the reef “and to protect it for generations to come”.
“Saying the Great Barrier Reef is ‘in danger’ could be just what it needs,” Branson wrote in a blog post yesterday.
The United Nations World Heritage Committee is set to make a decision on whether to change the listing of the reef at a meeting in Bonn, Germany, in June this year.
Like Branson, the UN has expressed concern that port developments and coal ships set to service Australia’s largest ever coal mine, which the federal government approved last year, will further damage the reef.
The Great Barrier Reef has already lost half of its coral cover in the last three decades, and it faces further threats from the Crown of Thorns Starfish and increased agriculture run-off.
In 2013, a federal government report noted that 24 out of 41 attributes which make up the ‘Outstanding Universal Value’ of the reef under the World Heritage Convention are deteriorating.
But the greatest threat to the reef, according to government scientists, is climate change. “The reef’s plight, like many others, is unbearably sad,” Branson said. “It is being totally overwhelmed by climate change impacts through a destructive combination of heat-driven coral bleaching, ocean acidification and tropical storms.”
Despite climate change being the greatest threat to the reef, a recent Australian Government plan designed to guide conservation efforts for the next 35 years and address UN concerns made next to no mention of the risk to the reef from rising emissions.
On Thursday, the United Nations warned that for the first time in millions of years the concentration of carbon dioxide in the earths atmosphere exceeded 400 parts per million.
The Greens environment spokesperson, Larissa Waters, said on Wednesday that she doesn’t “think the government has done enough policy-wise to avert the threat of a world heritage in danger listing for the Great Barrier Reef”.
“Which is an absolute tragedy,” she said, “because we’re talking about one of the seven wonders of the world.”
“The foremost World Heritage Committee has for the past four years now said to Australia ‘slow down, you’re on this path of industrialisation, we’re worried about the future of the reef, your own scientists are worried about the future of your reef, what are you going to do about it?”
“And the government has consistently thumbed its nose at the key recommendations, and it’s made some changes around the edges.”
Waters said she hopes the reef is not listed as ‘in danger’, despite the fact it is “in serious jeopardy”.
Yesterday, The World Wildlife Fund has released a ‘to do’ list, lobbying the government to do more than is proposed in its ‘Reef 2050’ plan.
At least one federal MP is likely to be unimpressed with these recent developments.
George Christensen MP, whose electorate of Dawson takes in part of the Great Barrier Reef, is standing by the government’s “exemplary document”.
The outspoken backbencher recently voiced his outrage at “eco-traitors” who are committing the “treason” of advocating for an ‘in danger’ listing.
“These extreme greens act like Wormtongue from The Lord of the Rings, flying overseas and whispering in the ears of the decision-makers and diplomats who have anything to do with UNESCO and the World Heritage Committee, poisoning their minds on the state of the reef,” Christensen said.
“They belong to groups such as Greenpeace, the Australian Marine Conservation Society, Friends of the Earth, Get Up, and the Environmental Defenders Office.”