The Mesoamerican Barrier Reef System (MBRS), also popularly known as the Great Mayan Reef or Great Maya Reef, is a marine region that stretches over along the coasts of four countries –

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

Belize Belize (; bzj, Bileez) is a Caribbean and Central American country on the northeastern coast of Central America. It is bordered by Mexico to the north, the Caribbean Sea to the east, and Guatemala to the west and south. It also shares a wate ...

, Guatemala, and Honduras – from

Isla Contoy Isla Contoy is a small island in the Mexican state of Quintana Roo, approximately 30 kilometers north of Isla Mujeres. The island is only in length and has an area of . Since 1961, Isla Contoy is protected by the Mexican government and was decla ...

at the northern tip of the

Yucatán Peninsula The Yucatán Peninsula (, also , ; es, Península de Yucatán ) is a large peninsula in southeastern Mexico and adjacent portions of Belize and Guatemala. The peninsula extends towards the northeast, separating the Gulf of Mexico to the north ...

south to Belize, Guatemala and the

Bay Islands Bay Islands may refer to: * Bay Islands Department, Honduras * Southern Moreton Bay Islands, Queensland, Australia See also * Bay of Islands * Bay of Isles * Island Bay, Wellington * Little Bay Islands Little Bay Islands is a vacant town in ...

of Honduras. The reef system includes various protected areas and parks including the

Belize Barrier Reef The Belize Barrier Reef is a series of coral reefs straddling the coast of Belize, roughly offshore in the north and in the south within the country limits. The Belize Barrier Reef is a long section of the Mesoamerican Barrier Reef System, ...

Arrecifes de Cozumel National Park The Arrecifes de Cozumel National Park is off the coast of the island of Cozumel in the state of Quintana Roo, Mexico. The Cozumel reef system is part of the Mesoamerican Barrier Reef System, the second largest coral reef system in the world. Eve ...

Hol Chan Marine Reserve Hol Chan Marine Reserve is a marine reserve close to Ambergris Caye and Caye Caulker, off the coast of Belize. It covers approximately 18 km² (4,448 acres) of coral reefs, seagrass beds, and mangrove forest. Hol Chan is Mayan for "li ...

(Belize),

Sian Ka'an Sian or Siyan may refer to: __NOTOC__ People *Siân, a Welsh girl's name; list of people with this name Places *Sian, Iran (disambiguation), various places in Iran *Sian, Russia, a rural locality in Amur Oblast, Russia *Xi'an, China, formerly roman ...

biosphere reserve A nature reserve (also known as a wildlife refuge, wildlife sanctuary, biosphere reserve or bioreserve, natural or nature preserve, or nature conservation area) is a protected area of importance for flora, fauna, or features of geological or ...

, and the Cayos Cochinos Marine Park. Belize's coastline, including the

, is home to approximately 30% of the Mesoamerican Barrier Reef System. Belize Caye Caulker-207

It begins near

on the northern tip of the Yucatán Peninsula and continues south alongside the

Riviera Maya The Riviera Maya () is a tourism and resort district south of Cancun, Mexico. It straddles the coastal Federal Highway 307, along the Caribbean coastline of the state of Quintana Roo, located in the eastern portion of the Yucatán Peninsula. ...

including areas like

Cozumel Cozumel (; yua, Kùutsmil) is an island and municipality in the Caribbean Sea off the eastern coast of Mexico's Yucatán Peninsula, opposite Playa del Carmen. It is separated from the mainland by the Cozumel Channel and is close to the Yucat� ...

and

Banco Chinchorro Banco Chinchorro is an atoll reef lying off the southeast coast of the Municipality of Othón P. Blanco in Quintana Roo, Mexico, near Belize. It was featured throughout the 2009 semi-documentary film ''Alamar'' by Pedro González-Rubio. Geograp ...

. It then continues south along the eastern coast of Belize including many cayes and

atolls An atoll () is a ring-shaped island, including a coral rim that encircles a lagoon partially or completely. There may be coral islands or cays on the rim. Atolls are located in warm tropical or subtropical oceans and seas where corals can gro ...

. It extends to the north-east corner of Honduras.

Biodiversity

The reef system is home to more than 65 species of

stony coral Scleractinia, also called stony corals or hard corals, are marine animals in the phylum Cnidaria that build themselves a hard skeleton. The individual animals are known as polyps and have a cylindrical body crowned by an oral disc in which a mo ...

, 350 species of

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

and more than 500 species of

fish Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of ...

. There are numerous species that live in or around the reef system that are endangered or under some degree of protection, including the following: sea turtles ( green sea turtle,

loggerhead sea turtle The loggerhead sea turtle (''Caretta caretta'') is a species of oceanic turtle distributed throughout the world. It is a marine reptile, belonging to the family Cheloniidae. The average loggerhead measures around in carapace length when fully ...

, leatherback turtle, and the

hawksbill turtle The hawksbill sea turtle (''Eretmochelys imbricata'') is a critically endangered sea turtle belonging to the family Cheloniidae. It is the only extant species in the genus ''Eretmochelys''. The species has a global distribution, that is lar ...

), the queen conch, the

West Indian manatee The West Indian manatee (''Trichechus manatus''), also known as the North American manatee, is a large, aquatic mammal native to warm coastal areas of the Caribbean, from the eastern US to northern Brazil. Living alone or in herds, it feeds on un ...

, the

splendid toadfish The splendid toadfish (''Sanopus splendidus'') also called the coral toadfish and the Cozumel splendid toadfish is a species of toadfish once believed to be entirely endemic to the island of Cozumel but have been found on the reefs of Honduras al ...

, the

American crocodile The American crocodile (''Crocodylus acutus'') is a species of crocodilian found in the Neotropics. It is the most widespread of the four extant species of crocodiles from the Americas, with populations present from South Florida and the coasts ...

, the

Morelet's crocodile Morelet's crocodile ''(Crocodylus moreletii)'', also known as the Mexican crocodile or Belize crocodile, is a modest-sized crocodilian found only in fresh waters of the Atlantic regions of Mexico, Belize and Guatemala. It usually grows to about ...

, the

Nassau grouper The Nassau grouper (''Epinephelus striatus'') is one of the large number of perciform fishes in the family Serranidae commonly referred to as groupers. It is the most important of the groupers for commercial fishery in the West Indies, but ha ...

elkhorn coral Elkhorn coral (''Acropora palmata'') is an important reef-building coral in the Caribbean. The species has a complex structure with many branches which resemble that of elk antlers; hence, the common name. The branching structure creates habit ...

, and

black coral Antipatharians, also known as black corals or thorn corals, are an order of soft deep-water corals. These corals can be recognized by their jet-black or dark brown chitin skeletons, surrounded by the polyps (part of coral that is alive). Antipat ...

. The reef system is suffering an invasion by the

red lionfish The red lionfish (''Pterois volitans'') is a venomous coral reef fish in the family Scorpaenidae, order Scorpaeniformes. It is mainly native to the Indo-Pacific region, but has become an invasive species in the Caribbean Sea, as well as along the ...

(''Pterois volitans'' and ''Pterois miles''), which is native to the Indo-Pacific region. Lionfish severely damage the reef ecosystem by eating nearly every reef-tending species, such as

cleaner shrimp Cleaner shrimp is a common name for a number of swimming decapod crustaceans, that clean other organisms of parasites. They belong to any of three families, Hippolytidae (including the Pacific cleaner shrimp, ''Lysmata amboinensis''), Pala ...

and other species that eat algae. These animals keep the corals clean, alive, and disease-free. Lionfish eat up to 90% of the reef-tending species in a given area within just a few months, which can result in a quick death for a reef. Valuable commercial species, such as lobster, are being negatively affected by the spread of the lionfish due to their enormous appetite. The reef system is home to one of the world's largest populations of manatees, with an estimated 1,000 to 1,500 of them. Some northern areas of the reef system near Isla Contoy are home to the largest fish on the planet, the

whale shark The whale shark (''Rhincodon typus'') is a slow-moving, filter-feeding carpet shark and the largest known extant fish species. The largest confirmed individual had a length of .McClain CR, Balk MA, Benfield MC, Branch TA, Chen C, Cosgrove J, ...

. The normally solitary whale sharks congregate there in social groups to eat and to mate.

Conservation

The Mesoamerican Barrier Reef System is considered critically endangered according to the criteria of the

IUCN Red List of Ecosystems The IUCN Red List of Ecosystems (RLE) is a global framework for monitoring and documenting the status of ecosystems. It was developed by the International Union for Conservation of Nature for biodiversity risk assessment. Its main objectives are ...

References

External links

Mesoamerican Barrier Reef System Project

a collaborative project for the management and conservation of the reef system, coordinated by the International Coral Reef Action Network (ICRAN) {{coord missing, Belize Coral reefs Marine ecoregions Ecoregions of Central America Natural history of Mesoamerica Regions of Central America Ecoregions of Belize Ecoregions of El Salvador Ecoregions of Guatemala Ecoregions of Honduras Ecoregions of Mexico Protected areas of Belize Protected areas of Mexico Caribbean Sea articles missing geocoordinate data IUCN Red List of Ecosystems