Coral reef protection
Coral reef protection is the process of modifying human activities to avoid damage to healthy coral reefs and to help damaged reefs recover. The key strategies used in reef protection include defining measurable goals and introducing active management and community involvement to reduce stressors that damage reef health. One management technique is to create Marine Protected Areas (MPAs) that directly limit human activities such as fishing.
It takes approximately 10 thousand years for coral polyps to form a reef, and between 100,000 and 30 million years for a fully mature reef to form.
Differences in exposure to wave patterns create a variety of habitat types. The coral need a mutualistic symbiotic relationship with zooxanthellae algae in order to build a reef. The ocean water contains relatively little beneficial nutrients that the coral can utilize. The single celled algae derive their nutrients by using photosynthesis, and the coral provide shelter to the algae in return for some of the nutrients. Coral receive their vibrant colors from the different species of zooxanthellae that inhabit them. Zooxanthellae populations can die with changing environmental conditions, causing the coral to lose color, known as coral bleaching.
Coral reefs provide a variety of services to humans and other species. These include providing habitat for fish and other marine species, destination sites for marine tourism, grounds for subsistence, recreational and commercial fisheries, medicinal substances and shoreline protection from storms.
The coral reef ecosystem provides habitat to over 9 million species covering approximately one fourth of marine life. Its three dimensional structure provides hiding places for fish, shrimp and clams. Coral itself is consumed by species such as parrotfish. It provides a hunting ground for predators.
Coral reefs houses plants and animals that produce chemical compounds that have found use in human medicines. As early as the 14th century, the medicinal properties of coral reef dwelling species were utilized. Antiviral extracts and tonics continue to be studied and toxic compounds such as neurotoxins discovered in coral reefs have proven beneficial as painkillers. The limestone skeleton of coral has been tested and used for human bone grafts, due to its porous nature and has a lower rate of rejection than artificial bone graft materials.
Two types of stressors are associated with reef systems: natural and human-induced. The effects of these stressors can range from negligible to catastrophic.
Acute stressors can inflict other damage, via unsustainable fishing practices, boat anchors or accidental groundings. Some fishing practices are destructive to reef habitats, such as bottom trawling, dynamite fishing and cyanide fishing. Ghost fishing (unintended damage from abandoned fishing equipment) harms many coral reefs. Even small-scale fishing can damage reefs if herbivores are not removed and thereby not allowed to protect reefs from encroachment by algae. Boaters can damage coral by dropping their anchors on reefs instead of sand. Accidental boat groundings can obliterate areas of coral reef. Lettuce corals and branching corals such as elkhorn and finger coral are fragile, but even massive boulder corals can be crushed or broken and turned upside down to die by a sailboat keel. Groundings in sand, or even the churning action of propellers, can cause major localized siltation, indirectly killing adjacent corals.
Sediment pollution from land has severe consequences for coral reef ecosystems. However, even along one coastline, separate reefs can experience different water flow conditions that affect sediment distribution. A 2015 study assessed sediment from two streambeds less than a mile apart on the island of Lānaʻi, Hawaii. One site experienced quick-moving currents that efficiently flushed away sediment, protecting the reef, while the other was subjected to currents and wave conditions that allowed sediment to be continuously re-suspended in the water, starving the reef of light.
The aim of coral restoration is to help coral adapt to stressors and changing environments. NOAA's Coral Reef Conservation Program and Damage Assessment, Remediation and Restoration Program approaches restoration by responding to and restoring physically damaged reefs, preventing the loss of habitat, implementing coral conservation projects, focusing on restoring endangered coral species and controlling invasive species. The Coral Restoration Foundation has restored over 100 genotypes of staghorn corals (Acropora cervicornis) using coral nurseries, and also has research goals of determining ecological success, ideal restoration locations and how surrounding organisms affect restoration.
Managing stream flow
Sediment flux can be reduced in steep watersheds on montane tropical islands in the Hawaiian archipelago by restoring vegetation and controlling invasive species. Gabions — check dams — created by planting normally invasive kiawe trees by a local community group, stopped 77 tons of sediment from flowing into the ocean that would have needed about five weeks of natural water flow to flush from the reef.
Coral aquaculture, the process of using coral nurseries to restore the world's reefs is a project that is capable of improving biodiversity, structural integrity and coral cover. Coral nurseries can provide young corals for transplantation to rehabilitate areas of reef decline or physical damaged. In this process, coral gametes are harvested from spawning grounds and grown in a laboratory environment, then replanted when they grow larger. This allows the coral to grow safely in controlled amounts under lab conditions. Nurseries can begin as small patches of rescued coral colonies, and may be salvaged and restored before transplantation. In 2009, The Nature Conservancy began to grow over 30,000 young coral in underwater nurseries in Florida and the Caribbean for transplantation.
Marine Protected Areas
Marine Protected Areas (MPAs) have become an increasingly prominent tool for reef management. MPAs promote responsible fishery management and habitat protection. Much like national parks and wildlife refuges, and to varying degrees, MPAs restrict potentially damaging activities. MPAs encompass both social and biological objectives, including reef restoration, aesthetics, biodiversity and economic activity. MPAs have not been universally accepted. Conflicts relate to lack of participation, clashing views, effectiveness and funding. Many MPAs offer inadequate protection for coral reefs. Only 27% of coral reefs are in MPAs globally. Only 15% of MPA sites were considered effective, with 38% partially effective and 47% ineffective. This leaves only 6% of coral reefs in effectively managed MPAs. In some situations, as in Kiribati's Phoenix Islands Protected Area, MPAs provide revenue that is potentially equal to the income they would have generated without controls.
Biosphere reserve, marine park, national monument and world heritage status can protect reefs. For example, Belize's Barrier reef, Chagos archipelago, Sian Ka'an, the Galapagos islands, Great Barrier Reef, Henderson Island, Palau and Papahānaumokuākea Marine National Monument are world heritage sites. The Parcel de Manuel Luís Marine State Park protects the largest coral reef in the South Atlantic. This became a Ramsar Site in February 2000.
Inhabitants of Ahus Island, Manus Province, Papua New Guinea, have followed a generations-old practice of restricting fishing in six areas of their reef lagoon. Their cultural traditions allow line fishing, but not net or spear fishing. The result is both the biomass and individual fish sizes are significantly larger than in places where fishing is unrestricted.
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