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Posts Tagged ‘coral’

2048

Photo: Erika Fish/QUT/AAP 
A pumice raft in the southwest Pacific in 2012. It is similar to the one now floating toward Australia. Pumice is a porous rock extruded by volcanoes. It can carry marine life, including coral, across the ocean and can help to replenish reefs.

Sometimes Nature works miracles that can leave a person breathless. So I feel a need to reach into Greek mythology for an explanation of the following.

The Great Barrier Reef suffered an 89% collapse in new coral after bleaching incidents in 2016 and 2017, according to the Guardian. But now from the sea bottom comes a repair kit. A message must have been sent through some mysterious channel to Poseidon, and he responded with roughly 37,000 acres of floating pumice carrying help.

Reports the Guardian, “A giant raft of pumice, which was spotted in the Pacific and is expected to make its way towards Australia, could help the recovery of the Great Barrier Reef from its bleaching episode by restocking millions of tiny marine organisms, including coral.

“The pumice raft, which is about 150 sq km, was produced by an underwater volcano near Tonga. It was first reported by Australian couple Michael Hoult and Larissa Brill, who were sailing a catamaran to Fiji, on 16 August.

” ‘We entered a total rock rubble slick made up of pumice stones from marble to basketball size,’ the couple said in a Facebook post. ‘The waves were knocked back to almost calm and the boat was slowed to 1 knot. The rubble slick went as far as we could see in the moonlight and with our spotlight.’ …

“Since then, the pair have been working with Queensland University of Technology geologist Scott Bryan by providing pictures and samples of the volcanic rock.

“Bryan said the raft will be the temporary home for billions of marine organisms. Marine life including barnacles, corals, crabs, snails and worms will tag along as it travels toward Australia and become a ‘potential mechanism for restocking the Great Barrier Reef. … Based on past pumice raft events we have studied over the last 20 years, it’s going to bring new healthy corals and other reef dwellers to the Great Barrier Reef.’ …

“Pumice forms when frothy molten rock cools rapidly and forms a lightweight bubble-rich rock that can float. The pumice raft comes from an unnamed but only recently discovered underwater volcano that satellite images reveal erupted about 7 August.

“[It] should begin to hit Australian shores in about seven months’ time, passing by New Caledonia, Vanuatu and reefs in the eastern Coral Sea along the way as coral begins to spawn. …

“Bryan said, ‘Each piece of pumice is a rafting vehicle. It’s a home and a vehicle for marine organisms to attach and hitch a ride across the deep ocean to get to Australia.’ ”

More here.

 

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Photo: Valeria Pizarro
The Varadero reef has survived in Colombia’s Cartagena Bay despite toxicity from heavy shipping. The corals grow twice as fast as similar corals elsewhere, but their skeletons are less dense, which may have something to do with their success.

The news about coral reefs has not been good for a long time. Rising temperatures and too much carbon dioxide have been killing off these delicate creatures worldwide, with dire consequences for the marine life that depends on their intricate communities.

But what is going on in Cartagena Bay? Elizabeth Svoboda has a fascinating story at the Christian Science Monitor.

“For the coastal communities that have harvested its bounty for centuries, and for the scientists who officially discovered it five years ago, there is no reef like Varadero. Locals call it ‘the improbable reef,’ and for good reason: It has persevered in the midst of intensive coastal development, streams of toxic runoff from the nearby Canal del Dique (Dike Canal), and waters so warm they’d turn many reefs into lifeless skeletons.

“Scientists like Lizcano-Sandoval and Pennsylvania State University’s Mónica Medina are working to uncover the secrets of Varadero’s striking resilience – secrets they can use to help other threatened reefs around the world.

“But just as Varadero begins to yield its tantalizing scientific bounty, it’s looking as if the reef may be damaged or even destroyed. A group of government officials, port authorities, and businesspeople is planning to dredge a channel so Cartagena’s harbor can accommodate more container ships – a move they say will boost the nation’s economy. However, the researchers who study Varadero, along with local environmental activists, are hoping to stall the dredging project so the reef’s storied legacy can continue – and perhaps contribute to the rescue of other endangered underwater Edens. …

” ‘Corals in Varadero have a very distinct growth pattern,’ says biologist Roberto Iglesias-Prieto, Dr. Medina’s colleague at Pennsylvania State University. Specifically, the corals grow about twice as fast as similar corals elsewhere, but their skeletons are less dense; it’s possible that these traits give them an advantage over their slower-growing coral counterparts.

“Medina thinks certain elements in runoff from the Canal del Dique may be benefiting the corals in surprising ways. ‘Part of the day, [the corals] get these nutrient-rich waters where they’re eating and photosynthesizing,’ Medina says. She notes that fairly recent changes in coral growth coincide with a period when more sediment was being dumped into the bay. …

“Varadero’s corals might also benefit from their location right at the mouth of Cartagena Bay. “They have constant communication with the sea,” [Dr. Valeria Pizarro, who discovered the reef,] says. The fresh inflow of ocean water might lessen the impact of toxic mercury, cadmium, and copper that runs off into the bay from nearby industrial facilities.

“Medina and her colleagues are trying to figure out if other aspects of the reef’s biology contribute to its success – aspects that could ultimately be replicated in reefs elsewhere. … Samples of microbes from Varadero’s corals – the onboard collection of bacteria, viruses, and algae that perform critical metabolic tasks – have revealed that they are totally distinct from those found on other reefs, Medina says. Her lab is conducting a detailed analysis to find out whether the microbes might be performing important functions, such as fighting disease, that help the corals to survive even in less-than-ideal conditions.

“In the future, if conservationists can transport Varadero’s hardy corals to other endangered reefs around the world, or even seed threatened reefs with whatever microbial cocktail helps Varadero’s corals thrive, those reefs might have a better chance of surviving despite ocean warming and pollution. Many of the world’s reefs now hang in a liminal zone between death and survival. By putting Varadero corals’ survival tactics to work on other threatened reefs, scientists like Medina, Lizcano-Sandoval, and Pizarro hope to tilt those reefs a little bit closer to the side of life.”

More at the Christian Science Monitor, here.

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Photo: National Oceanic and Atmospheric Administration
A sponge the size of a minivan was found in summer 2015 in the Papahānaumokuākea Marine National Monument off Hawaii.

One of Earth’s oldest living animals is a sea sponge. As big as a minivan, it has been growing for generations unnoticed and undisturbed in waters off Hawaii.

Elahe Izadi writes in the Washington Post that a remotely operated vehicle (ROV) “captured footage of the spectacularly large sponge during a National Oceanic and Atmospheric Administration deep-sea expedition, and the species was identified for the first time in a study published [in May] in the journal Marine Biodiversity. …

“There’s more to this sponge than its girth: It could also be among the oldest living animals on earth. … Sponges can live for hundreds or even thousands of years. ‘While not much is known about the lifespan of sponges, some massive species found in shallow waters are estimated to live for more than 2,300 years,’ the study authors write. …

“ ‘Finding such an enormous and presumably old sponge emphasizes how much can be learned from studying deep and pristine environments such as those found in the remote Papahānaumokuākea Marine National Monument,’ Daniel Wagner, Papahānaumokuākea research specialist, said in a statement. …

“Christopher Kelly, NOAA research scientist and co-lead for the expedition, said the sponge ‘just appeared’ on the ROV’s high-definition camera, Australia’s Pacific Beat radio reported.

” ‘We were looking for deep water corals and sponges, and we had just gotten some close ups of some corals, then turned away to continue the survey and the sponge appeared out of nowhere.’ ”

I can just picture that cinematic moment of discovery.

More at the Washington Post, here.

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Suzanne’s Mom was asked to review Revolution, a film by the young environmentalist, biologist, diver, and Sharkwater filmmaker Rob Stewart.

Encompassing gorgeous deep-sea photography, scientific climate-change testimony, a representative of the drowning country of Seychelles, and many youth demonstrations, the documentary forces you to think about what the burning of fossil fuels is doing to the oceans and what it means for the future of the planet. It also gives you the sense that anyone can do something about it — take up a camera, make a poster, or write a letter that makes a change.

The film is infused with a sense of youth, of young people saying, “Enough!” I particularly loved the moment early on when Stewart, who had read only two books on filmmaking, is flubbing his lines in front of Darwin’s Arch. What comes across in addition to the humorous inexperience is a feeling of energy, optimism, and determination.

The film has many engaging details about sea life that Stewart can’t resist throwing in, like how the endangered pygmy seahorse, which camouflages itself to look like coral, “mates for life — and the guy gets pregnant!”

He talks about how the burning of fossil fuels creates too much carbon dioxide, which is absorbed by the ocean and is harmful to anything that needs to grow a skeleton, which is pretty much everything but nasty, poisonous creatures that flourish in the muck where corals died, like the flamboyant cuttlefish. Coral expert Charlie Veron comments that at the same rate of ocean acidification caused by too much CO2, there will be no coral reefs in 50 years.

Stewart also looks at the island nation Madagascar, sole home of lemurs, explaining that endangered tropical forests are responsible for 1/4 of the world’s species and 1/3 of our oxygen. Madagascar scientist Serge Rajaobelina says that population growth on the island and the burning of the trees for development has meant the loss of 80 percent of the forest in 40 years, more than in 55 million years.

The movie goes on to cover perhaps a few too many youth protests, including one in which an inspired, tree-planting young boy says, “We have found we have to save our own future,” and is later arrested in tears.

But then we get to see that children and young adults are actually having an impact.

A sixth-grade class in Saipan writes letters to the Saipan government against killing sharks for shark fin soup, and the government signs a law preventing the practice. In fact, we are told, since the first Stewart film, China, the main adherent of shark-fin soup, has dropped the practice by 70 percent, and 100 countries have banned it.

The upbeat Saipan children who comment on their successful advocacy embody the truth of my favorite Pete Seeger line, “one and one and 50 make a million.” Says one, “Maybe the world might not end because of what we are doing.”

Watch the Revolution trailer here.

[We do not accept gifts here, so the DVD that the film company sends me for screening and reviewing will be forwarded to Save the Bay, RI.]

The late Rob Stewart. The filmmaker did not come up from a dive 1/31/17 near Key Largo.
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One of the sources I check for ideas to share with you is the website for the delightful environmental radio show, Living on Earth.

A story about the healthy coral reefs in the deep water off Cuba caught my eye, especially as there has been a resurgence of interest in Cuba lately.

Living on Earth host Steve Curwood interviews Robert Wintner about his latest book, Reef Libre: The Last, Best Reefs in the World.

“CURWOOD: Now, your book is very timely. Come on, tell me … you got some kind of tip off on this political thaw? …

“WINTNER: I thank Neptune for that. We got word of this particular reef system [that was] called the last best reef system in the world. And the three qualifiers for that rating were 100 percent biodiversity (that means all the species that were ever there are there now, and in fact some they thought were extinct), 100 percent coral cover and 100 percent host of apex predators, and that was the key right there to restoring these reefs to healthy conditions. No natural system can survive intact without apex predators, that’s what allows every level of the food chain beneath it to be at optimum balance. And the glaring example in the world today is Cuban reefs, our Jardines de la Reina. That’s the ocean people talk about, that the world used to have, that we used to love. It’s there in in Cuba.”

Read all about it here., or listen to the broadcast. Lots of amazing photos. And be sure to note how the Cubans control the invasive lionfish by removing the spines and conditioning bigger predators to the taste.

Photo: Robert Wintner at Living on Earth
Reef Libre: The Last, Best Reefs in the World is diver and photographer Robert Wintner’s most recently published book.

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Some posts at Andrew Sullivan I only need to glance at briefly and bells go off: for example, this entry about an artist who works with coral.

Andrew quotes Amelia Urry writing about Courtney Mattison, who became enamored of coral while studying conservation biology at Brown University and moonlighting at the Rhode Island School of Design.

“Mattison’s newest piece, Our Changing Seas III,” says Urry at Grist, “depicts a hurricane-spiral of bleached corals coalescing to a bright center. You can read it as a message of hope or one of impending doom, depending on your disposition …

At the heart of Mattison’s artwork is her desire to inspire real-life changes in how people view and treat the world’s oceans and environments. Similar to the Our Changing Seas series, Courtney Mattison’s Hope Spots collection comprises 18 vignettes, each of which represents a vital marine ecosystem in its ideal form (that is, protected from various threats such as global warming or pollution).” Read more at Grist, here.

Art: Courtney Mattison
“Our Changing Seas III,” a ceramic coral reef

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