New Coral Sowing Method Could Inspire Large-scale Reef Restoration

2018-01-05T17:24:27+00:00 January 5, 2018|
(Credit: SECORE International / Valérie Chamberland)

(Credit: SECORE International / Valérie Chamberland)

Researchers with the nonprofit SECORE International have developed a new technique for planting coral. The method could enable reef restoration efforts at larger scales.

(From By Brooks Hays) — Currently, the process of replanting reefs is labor-intensive. Divers plant coral larvae or coral fragments individually. Often, such restoration efforts occur across a region no larger than 10,000 square feet. Meanwhile, coral degradation is occurring across thousands of square miles.

The new technique involves the stabilization of coral larvae in a specially-designed substrate. Instead of being individually planted by hand, the larvae-lined substrate attaches naturally to the reef. The substrate looks like a small, star-like anchor. It is wedged into crevices in the reef, allowing the corals to naturally sows themselves into the reef structure.

Using previous methods, the planting of 10,000 individual corals inside a 10,000 square-foot plot requires anywhere from several hundred to a few thousand person-hours of labor.

“Sowing the same number of corals could be achieved in less than 50 person-hours, a time saving of over 90 percent,” Margaret Miller, research director for SECORE, said in a news release. “Additionally, material costs could be reduced up to one third, representing a substantial advance for future restoration work.”

Scientists tested the new method using larvae released by golf ball corals, Favia fragum, in Curacao, the Caribbean island.

“Shortly after collection, we settled the coral larvae on specially designed tetrapod-shaped substrates made of cement,” said lead researcher Valérie Chamberland.

By using naturally reproduced coral larvae, researchers can ensure healthy genetic diversity among newly planted corals. Once the larvae developed into coral polyps, researchers planted their substrate, called Seeding Units, on a test reef and tracked their growth.

“The specific shape of the tetrapod substrates allowed us to simply wedge the Seeding Units into natural crevices of the reef,” Chamberland said. “Most Seeding Units were stable within few weeks, either secured in crevices or naturally cemented on the reef’s framework.”

The structure of the substrate helps ensure attachment to the existing reef, as well as …

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