The Usumacinta mangroves

ecoregion An ecoregion (ecological region) or ecozone (ecological zone) is an ecologically and geographically defined area that is smaller than a bioregion, which in turn is smaller than a biogeographic realm. Ecoregions cover relatively large areas of l ...

(WWF ID: NT1437) covers the

mangrove A mangrove is a shrub or tree that grows in coastal saline water, saline or brackish water. The term is also used for tropical coastal vegetation consisting of such species. Mangroves are taxonomically diverse, as a result of convergent evoluti ...

forests ont the

Gulf Coast of Mexico The Gulf Coast of Mexico or East Coast of Mexico stretches along the Gulf of Mexico from the border between Mexico and the United States at Matamoros, Tamaulipas all the way to the tip of the Yucatán Peninsula at Cancún. It includes the coastal ...

, around the margins of the

Laguna de Términos Laguna de Términos is the largest tidal lagoon by volume located entirely on the Gulf of Mexico, as well as one of the most biodiverse. Exchanging water with several rivers and lagoons, the Laguna is part of the most important hydrographic riv ...

("Lagoon of Ends"). The "Ends" in the name refer to the mouths of the rivers that empty into the lagoon, including the

Usumacinta River The Usumacinta River (; named after the howler monkey) is a river in southeastern Mexico and northwestern Guatemala. It is formed by the junction of the Pasión River, which arises in the Sierra de Santa Cruz (Guatemala), Sierra de Santa Cruz ...

. This region, which is due south of the mouth of the

Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it f ...

across the

Gulf of Mexico The Gulf of Mexico ( es, Golfo de México) is an oceanic basin, ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of ...

, receives an estimated one-third of the wintering birds migrating on the

Mississippi Flyway The Mississippi Flyway is a bird migration route that generally follows the Mississippi, Missouri, and Lower Ohio Rivers in the United States across the western Great Lakes to the Mackenzie River and Hudson Bay in Canada. The main endpoints of t ...

. It is estimated that the lagoon supports 90 endangered species.

Location and description

The lagoon and surroundings are in

Campeche Campeche (; yua, Kaampech ), officially the Free and Sovereign State of Campeche ( es, Estado Libre y Soberano de Campeche), is one of the 31 states which make up the 32 Federal Entities of Mexico. Located in southeast Mexico, it is bordered by ...

State of Mexico. The mangroves cover the river deltas of the

and

Grijalva River Grijalva River, formerly known as ''Tabasco River'', ( es, Río Grijalva, known locally also as Río Grande de Chiapas, Río Grande and Mezcalapa River) is a long river in southeastern Mexico."Grijalva." ''Merriam-Webster's Geographical Diction ...

. They also cover the margins of the lagoon and inland for 5 km or so where the balance of saline and fresh water supports mangrove species. The lagoon is a RAMSAR wetland of international importance. The surrounding inland ecoregion is the

Pantanos de Centla The Pantanos de Centla (Centla swamps) are wooded wetlands along the coast in state of Tabasco in Mexico. They have been protected since 2006 with the establishment of the Pantanos de Centla Biosphere Reserve. It is also a World Wildlife Fund ...

ecoregion.

Climate

The climate of the ecoregion is '' Tropical savanna climate - dry winter'' (

Köppen climate classification The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, with several later modifications by Köppen, notabl ...

(Aw)). This climate is characterized by relatively even temperatures throughout the year, and a pronounced dry season. The driest month has less than 60 mm of precipitation, and is drier than the average month. Precipitation in the ecoregion averages 1,600 mm/year.

Flora and fauna

The characteristic mangrove tree species in the region are red mangrove (''

Rhizophora mangle ''Rhizophora mangle'', the red mangrove, is distributed in Estuary, estuarine ecosystems throughout the tropics. Its Vivipary, viviparous "seeds", in actuality called propagules, become fully mature plants before dropping off the parent tree. Th ...

''), white mangrove (''

Laguncularia racemosa ''Laguncularia racemosa'', the white mangrove, is a species of flowering plant in the leadwood tree family, Combretaceae. It is native to the coasts of western Africa from Senegal to Cameroon, the Atlantic Coast of the Americas from Bermuda and ...

''), and black mangrove (''

Avicennia germinans ''Avicennia germinans'', the black mangrove, is a shrub or small tree growing up to 12 meters (39 feet) in the acanthus family, Acanthaceae. It grows in tropical and subtropical regions of the Americas, on both the Atlantic and Pacific Coasts, ...

''). An associated species is the scrub '' Dalbergia brownii''. Periodic flooding prevents the extensive growth of herbaceous species. The diversity of wetland types (marshes, swamps, coastal lagoon, riverine margins and others) supports a wide diversity of species. Scientists have recorded 374 species of vascular plants, 134 species of mammals, 26 of amphibians, 85 of reptiles, 279 of birds, and 60 species of fish.

Protected areas

Officially protected areas in the ecoregion include: *

Pantanos de Centla Biosphere Reserve The Pantanos de Centla (Centla swamps) are wooded wetlands along the coast in state of Tabasco in Mexico. They have been protected since 2006 with the establishment of the Pantanos de Centla Biosphere Reserve. It is also a World Wildlife Fund ...

References

{{reflist Neotropical ecoregions Ecoregions of Mexico Mangrove ecoregions Usumacinta River Gulf Coast of Mexico