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A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. [1] Most coral reefs are built from stony corals, whose polyps cluster in groups. Coral belongs to the class Anthozoa in the animal phylum Cnidaria, which includes sea anemones and ...
Coral reefs are one of the most well-known marine ecosystems in the world, with the largest being the Great Barrier Reef. These reefs are composed of large coral colonies of a variety of species living together. The corals from multiple symbiotic relationships with the organisms around them. [21] Coral reefs are being heavily affected by global ...
It includes the Florida Reef, the only barrier coral reef in North America [1] and the third-largest coral barrier reef in the world. It also has extensive mangrove forest and seagrass fields. The Florida Keys National Marine Sanctuary, designated on December 28, 1990, [2] was the ninth national marine sanctuary to be established.
Overfishing and destructive fishing methods: the coral reefs have been heavily fished due to increasing demand for food. Overfishing of important reef species negatively impact the coral reefs’ biodiversity and ecological. Additionally, some destructive means of fishing are used on coral reefs including dynamite and cyanide. These practices ...
A variety of biotic reef types exists, including oyster reefs and sponge reefs, but the most massive and widely distributed are tropical coral reefs. [1] Although corals are major contributors to the framework and bulk material comprising a coral reef, the organisms most responsible for reef growth against the constant assault from ocean waves ...
The Great Barrier Reef is the world's largest coral reef system, [1] [2] composed of over 2,900 individual reefs [3] and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi).
The Amazon Reef (also referred to as the Amazonian Reef) is an extensive coral and sponge reef system, located off the coast of French Guiana and northern Brazil. It is one of the largest reef systems in the world known to exist, with scientists estimating its length to be over 600 miles (970 km) long, and covering over 3,600 square miles ...
The coral reefs of the U.S. Virgin Islands suffered severely from coral bleaching in 2005, which led to a 60% decline in coral activity. The USGS began extensive research in the area and scientists discovered previously unknown coral ecosystems at the submerged stems of mangrove trees in the Hurricane Hole area of the National Monument.