The Restoration Revolution
By Matt Dozier
Ken Nedimyer tends to staghorn coral growing on a coral tree nursery offshore of the Florida Keys.
For the past three decades the coral reefs of the Florida Keys have been
under stress. A poisonous cocktail of high ocean temperatures, polluted
runoff from coastal development, coral disease and the sudden
disappearance of algae-grazing urchins (Diadema) left millions of corals
stricken, many never to recover.
Two species in particular -- the venerable elkhorn (Acropora palmata) and
staghorn (Acropora cervicornis) varieties -- felt the impact most acutely.
Undisputed reef-building champions of the Caribbean for thousands of
years, they had laid the foundations of the region's most vibrant
ecosystems. Since the 1970s populations of elkhorn and staghorn have
declined by an estimated 92-97 percent.
Today, however, there's a new effort in the works to rebuild these desolated
reefs from the ground up with the hope that once-prosperous underwater
communities could soon recapture their former glory.
In late 2016, the National Oceanic and Atmospheric Administration (NOAA)
awarded a $2.1 million grant to the Florida-based Coral Restoration
Foundation (CRF) to undertake one of the most ambitious coral-planting
efforts in history. The project sets a target of growing more than 50,000
coral species, mostly staghorn and elkhorn, and distributing them across
eight reefs along the Florida Reef Tract over three years.
For Kayla Ripple, CRF science program manager, that investment represents
a major milestone for her organization and for the coral restoration field as a
whole. "No one's ever done restoration on this scale before," Ripple said.
"This is going to be the basis for our entire work for the next three years, and
we're really excited about it."
NOAA Coral Reef Restoration Program Manager Tom Moore, whose office
supports restoration of damaged areas that "need a little extra boost," said
the grant is the NOAA Restoration Center's largest in terms of number of
corals on an individual award. "Every year we're upping the ante on what
we've done in the past," Moore said. "And the reality is that we have to -- we
don't have any choice in the matter. In order to have restoration matter at an
ecosystem level, we've got to continue to significantly increase the amount
of restoration that's being done every year."
Founded in 2007 by coral-restoration pioneer Ken Nedimyer, CRF is a
nonprofit organization that works to restore and study coral reefs and
educate the public about the importance of the oceans. CRF has developed
ingenious tools and techniques to cultivate and plant threatened corals such
as staghorn and elkhorn, collectively known as branching corals or
One of CRF's biggest innovations has been the development of coral
nurseries off the Florida coast, where CRF staff and volunteers nurture
fragments of corals into specimens large enough to transfer onto a reef in
need. These floating havens, six in total, will supply all 50,000 of the corals
for the three-year project. Each nursery consists of a submerged forest of
PVC pipe "trees" with perpendicular branches from which up to 100 pieces
of coral are suspended by fishing line.
The nursery corals are organized by species and by their genetic makeup, or
genotype. Each PVC tree is also a family tree of sorts, hosting corals that are
genetically identical to each other. To grow more of a particular individual,
divers simply break off a small piece from the "parent coral" and hang it next
to its siblings. Amazingly, some of the earliest parent corals, collected more
than a decade ago as "fragments of opportunity" broken off from the reef by
storms, are still going strong today. "A lot of the parent fragments have been
in our nursery for 10 to 15 years now," Ripple said. "From the initial fragments
collected, you can create thousands and thousands of corals. Instead of
taking coral from one reef and putting it on another, the nursery can sustain
your propagation in perpetuity."
Elkhorn coral grows on "blocks" in the CRF Snapper Ledge Nursery to act as brood stock for elkhorn
Supercharging the Science
Perhaps even more significant than the sheer number of corals to be planted
under the latest CRF project is how they plan to do it. "Basically, what we did
in the past was whatever corals we had available, we would plant on the
reefs," Ripple said. "Our goal was to outplant as many different genotypes as
we could." This time the approach is different. Instead of a coral-planting
free-for-all, Ripple's team carefully selected a genetically diverse roster of
corals -- 50 staghorn, 50 elkhorn -- based on high-resolution genome
sequencing done by Steve Vollmer, Ph.D., at Northeastern University. "From
there, we're planting those genotypes across eight different reef habitats in
the same design, the same way, in really large numbers," she said.
By keeping meticulous records of where each genetic strain of coral is
planted and monitoring how well they do over time, researchers will be able
to look for links between a coral's genes and its ability to survive in a
particular environment. "Once we can understand what's actually causing
them to react differently, that has really broad implications for further
restoration of coral reefs," Ripple said. "So we're hoping that this can be an
example for other groups to follow."
In fact, that's another key requirement of the grant. To qualify for NOAA
funding, CRF had to create a data-sharing plan to ensure everyone has
access to the data their team gathers during the project.
"CRF is going well above and beyond here," Moore said. "They're actually
setting up these experimental projects at all of these sites, and they're going
to be sharing that information with the research community in a way that
says, `Come in and run your own experiments here.' It's a great model, and I
think we're going to get a lot out of it."
Coral Restoration: Evolved
CRF's ongoing approach has been one of constant experimentation, with the
hope that someday the techniques its founder pioneered in 2003 could
spark efforts to reinvigorate damaged reefs worldwide. "In the past, it was all
trial and error," Ripple said. "Now restoration is evolving into this massive,
widespread thing across lots of different groups in lots of different
countries." CRF's NOAA-backed, 50,000-coral effort is the latest big step in
After three to six months, corals grow over the epoxy and adhere naturally
to the reef. As they continue to grow, the corals begin to fuse into one another,
creating coral thickets that act as habitat for fish and invertebrates.
a coral researcher at the Australian Research Council (ARC) Centre of
Excellence for Coral Reef Studies at James Cook University in Queensland,
Australia, points out that there's still a long way to go from a numbers
standpoint. He said he recently surveyed a typical reef around a small island
in Queensland for a study, and on that one single reef he found roughly
100,000 corals. "Multiply that by 3,000 reefs on the Great Barrier Reef, and
you realize that it's a drop in the ocean," he said.
Moore said that realization is reflected in the urgency of NOAA's restoration
work. "We're really pushing our partners to make dramatic leaps forward," he
said. "We've got to not just be putting 50,000 corals out a year; we've got to
be putting a half-million corals out a year."
Money for coral restoration is precious, Moore said, and finite -- so planting
10 times more corals can't hinge on getting 10 times more funding. That's
why the agency places such heavy emphasis on improving the per-dollar
efficiency of restoration efforts, such as growing corals faster, planting them
more efficiently and improving their survival rate.
Ripple said CRF hopes the data it gleans will help pinpoint specific genetic
traits that make corals hardier and more resilient in various conditions. So
while the restoration may be limited to CRF's backyard, the ARC's Torda
acknowledged that the treasure trove of information the project will amass
could have value that reaches far beyond the Caribbean. "I think that's a
pretty sweet dataset to tap into," he said. "It would be very valuable indeed."
One thing restoration can't solve is persistent problems that make life hard
for corals in the wild. "Restoration is only meaningful in places where you
solve the problem that actually caused the mortality in the first place," Torda
Corals may have something of a reputation for being fragile, but they are
naturally resilient creatures. Subject them to any one source of stress --
high temperatures, bad water quality, marauding crown-of-thorns starfish --
and there's a good chance they will bounce back.
Divers transport crates of corals to a restoration site, where they will glue them to the reef using a
two-part marine epoxy.
But for decades, corals have been subjected to a host of slings and arrows
that beat them down until they eventually succumb. "It's like your immune
system," said Beth Dieveney, a policy analyst for NOAA's Florida Keys
National Marine Sanctuary. "The more stress you're under, and the more
impacts you're hit by, the weaker and weaker you get."
Some of those stressors are fixable. Dieveney said the sanctuary has
developed an elaborate network of marine zones within the wider sanctuary
boundaries to help protect the Keys' coral reefs from accidental damage
through popular activities like boating and fishing.
The sanctuary also issued the permits for CRF's coral-restoration work and
has spent decades seeking to educate the public and reduce threats such as
land-based pollution on the region's corals. "The idea is that the local things
we can control will help shore up the coral reef for the more global impacts
that are harder to address at a local level," Dieveney said.
She's referring to, of course, climate change and ocean acidification -- two
massive global problems that, left unchecked, will continue to wreak havoc
on coral-reef ecosystems everywhere. And if that happens, Moore said, no
amount of restoration will be enough. "Restoration is not the long-term
solution here," Moore said. "Restoration is something that helps us buy time.
We can't go out and destroy reefs because we know how to restore them.
The most important thing we can do is conserve the ones we already have."
For more information or to find out how you can get involved, visit
Watch the video Coral Restoration Foundation: Planting Staghorn Coral.
© Alert Diver -- Q1 Winter 2017