Name: "リーフリバイバル "本編エピソード ("Reef Revival" Full-Length Episode)
Uploaded: 2021-01-14T05:14:00.000Z
Duration: 26 min 44 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

In the Spring of 2008 an eighty-four foot pleasure boat departed from Ft. Lauderdale

bound for the Caribbean. Thirty miles south of Miami, it strayed from

marked navigation channels into the shallow waters of Biscayne National Park.

Suddenly, running at full speed it collided with a coral reef near Elliot Key.

Corals, sponges and sea fans were instantly obliterated as the boats twin propellers plowed

through the reef. The engines were disabled and the powerless

vessel drifted in the wind until grounding on a second reef.

Here, the wind and waves rocked the boat on its hull, shattering the ancient coral mounds

and pounding the reef into rubble. A coral reef that had taken centuries to grow

was destroyed in just moments. Two and a half years later, coral researchers

and resource managers are searching for solutions to help the oceans declining coral reefs.

Can new technologies and naturally occurring biological mechanisms help restore the lost

coral communities? And can ecological balance be returned to Floridas coral reefs?

Major funding for this program was provided by The Batchelor Foundation, encouraging people

to preserve and protect Americas underwater resources.

Biscayne National Park is an undersea garden filled with multi-colored sponges, corals

and sea fans. At the northern extent of the Florida Keys reef tract its sea grass beds,

coral reefs and mangrove shorelines cover more than 170,000 acres a gem in the National

Park system, but an area with a history of damaging boat groundings.

Corals in Biscayne National Park and on a global scale are in a serious state of decline

due to stresses like climate change, disease outbreaks and overfishing.

Since the late 1970s close to ninety-eight per cent of staghorn and elkhorn corals have

disappeared from the reefs in Florida and the Caribbean.

Because corals are having such a difficult time persisting, resource managers want to

restore boating impacts like the 2008 grounding site in the park.

When the vessel grounded it crushed up the surface of the reef into a rubble field and

were trying to use a combination of adhesives to stabilize that rubble. Were collecting

the rubble into mounds like this and like this and well be using a combination of cement

and natural sponges that are found right here on the reef to bind this rubble to stabilize

it through time. Right now the rubble mounds are in the process of being put together.

Were installing rebar stakes like this that will help us monitor them through time and

well be looking at things such as coral recruitment, the stability of the mounds themselves, if

they change in size and shape and height, and well probably monitor theses for a period

of at least five years. Researchers at the University of Miami have

developed one of the first underwater applications for mosaic imaging, a technique comparable

to aerial photography on the land. This technology will create useful perspectives of the coral

reef and grounding site in Biscayne National Park. The diver swims back and forth in a

lawnmower-like pattern recording overlapping images of the underwater landscape. Later,

at the university laboratory, a single seamless image of the reef is produced.

This is basically an unprecedented baseline in terms of the amount of information you

can get in a very short amount of time. Three-dimensional images can be created over

time to show reef areas where corals grow best, the places where restoration is most

likely to succeed. New growths of soft corals and sponges are

returning to the grounding site, but the boats most damaging impacts are still evident.

The damage extends several hundreds of square meters and really theres no easy way to document

that. Here were able to use the video and the stills to really cover the entire area

both the affected area and also the community around it so we know what this area should

look like when its fully restored. Coral reef restoration gained traction in

the Florida Keys National Marine Sanctuary with marine biologists like Harold Hudson,

The Reef Doctor, and Ken Nedimeyer. Hudson, a restoration

specialist for the sanctuary, perfected a design for reef modules that were used for

the structural repair of a large vessel grounding site, the Wellwood, on Molasses Reef near

Key Largo. Nedimeyer performed the biological restoration with transplanted corals grown

in his undersea nursery. His restoration plan was validated when it was discovered that

the transplants on the reef were spawning several years sooner than expected.

I was real excited, I thought man, this is amazing because this is exactly what weve

been trying to say that were going to do which is re-establish these spawning populations

of corals. It brought a whole new life to the possibility of not just putting corals

back on the reef but re-establishing breeding populations that could then re-populate other

downstream areas. Nedimeyers coral nursery is the largest in

the country and a model for many coral aquaculturists. Here you encounter a hundred rows of coral

fragments mounted on concrete blocks. Each coral is attached to a disc with a label designating

its origin and genotype, or genetic properties. More than a thousand staghorn cuttings are

strung from six line nurseries suspended in the water column by floats and cross-tied

with horizontal lines. On a line nursery they grow down, they grow

to the side, they grow all different directions. And another thing thats nice about them, if

a turtle or a shark or a fish bumps against them on the line they just bounce out of the

way and they swing right back to where they were. If a turtle bumps against a coral thats

firmly mounted on a disc itll break it off. Nedimyer cultivates staghorn coral, one of

the principle reef building corals and one listed as threatened under the Endangered

Species Act. He cultivates them in his nursery for a year then transplants them to the reef.

One of the things we need to be doing is preserving the genetic diversity that we still have.

And if we dont preserve as much of that as possible right now we wont have anything to

work with in ten or fifteen years. Research Associate Tom Capo and colleagues

at the University of Miamis experimental hatchery are preserving the genetic diversity of orphaned

corals whose survival was threatened by storms, boat groundings and anchor pulls. Some were

recovered from the grounding site in Biscayne National Park. Researchers are trying to answer

questions about a destructive phenomenon known as coral bleaching.

Whats going on? Is it disease? Is it some sort of water quality parameter? And many

of these questions cannot be answered easily in the field. So the goal is to have a coral

genetic bank, a coral resource that we can provide genetically maintained strains of

coral to people, bona fide researchers around the world so that they can look at these problems,

at these issues, and look at them in a scientific way.

In a partnership between Biscayne National Park and the University of Miami, trained

volunteers assist Capo with a labor-intensive process known as fragmentation to produce

a large number of small coral specimens. You should have one ready for him now, I mean

he should not stop. Travertine plates are marked, drilled and

fitted with passive integrated transponders, or PIT tags, that will give each coral a unique

identity. The large corals are cut into fragments, each

about an inch-and-a-half in diameter. The bottom surface is shaped on a tile saw. The

fragment is thoroughly dried, super-glued to a PIT tag plate and cataloged for future

reference. Half of the fragments will be transplanted

at the coral restoration site in Biscayne National Park, the other half will remain

at the facility for monitoring and lab studies to help Capo and coral researchers answer

another difficult question. How can we enhance all of this to make the

only reef tract in the continental United States a viable place rather than seeing it

deteriorate like its been doing over the past ten years?

One of Capos research partners, Martin Moe, a marine biologist in the Florida Keys, believes

he has an answer. In 1983, there was this tremendous plague

and it hit only one organism. And that was the long-spined sea urchin, Diadema Antellerum