Английская Википедия:Esmeraldas–Pacific Colombia mangroves
Шаблон:Short description Шаблон:Infobox ecoregion The Esmeraldas-Pacific Colombia mangroves (NT1409) is an ecoregion of mangrove forests along the Pacific coast of Colombia and Ecuador. It is threatened by human population growth, leading to over-exploitation for wood and clearance for farming and aquaculture.
Geography
Location
Mangroves are found along the coast of Colombia and Ecuador from the Gulf of Tribugá in the north to Mompiche Bay in the south. Between these bays there are extensive stands of mangroves in the mouths of the San Juan, Naya, Guapi, Mira and Esmeraldas rivers. The mangroves cover Шаблон:Convert. The largest block is the almost continuous strip from the Mataje River to Chanzará bay near Guapi.Шаблон:Sfn In 1996 it was estimated that Шаблон:Convert of mangroves were growing in the four Colombian Pacific coast departments.Шаблон:Sfn The mangroves border the Chocó–Darién moist forests ecoregion along most of the Pacific coast of Colombia. In the extreme south they border the Western Ecuador moist forests.Шаблон:Sfn
Terrain
The ecoregion may be divided into two large zones to the north and south of Cabo Corrientes.Шаблон:SfnШаблон:Efn In the northern section the continental shelf is narrow, with the land rising steeply from the shore to around Шаблон:Convert above sea level. Many small rivers supply clear water to the ecoregion year round. There are strong low-intensity upwellings along the coast.Шаблон:Sfn
The southern section fringes a flat sedimentary coastal plain with a broad continental shelf. There are no coastal upwellings. Rocks are mostly lutite, sandstone and conglomerates, with some limestone.Шаблон:Sfn The mangroves along the low, alluvial coast that stretches over Шаблон:Convert from Cabo Corrientes into Esmeraldas Province are the largest mangrove area in northwest South America, forming the tidal fringe of the coastal plain Шаблон:Convert wide.Шаблон:Sfn There are large river deltas at the mouths of the Mataje, Mira, Patía, Sanquianga and Guapi rivers, and smaller deltas at the mouths of about 25 smaller rivers. There provide more fresh water than in the north, and often carry much more sediment.Шаблон:Sfn The mangrove forest strips run parallel to the coast in the southern section and may extend inland for as much as Шаблон:Convert due to the Шаблон:Convert tides.Шаблон:Sfn
Climate
The mangroves adjoin wet tropical forest with temperatures over Шаблон:Convert and very high rainfall. The climate is influenced by the Intertropical Convergence Zone. Annual rainfall in the northern section is from Шаблон:Convert, while the southern section receives Шаблон:Convert.Шаблон:Sfn
Ecology
The mangrove forests may release 8 to 15 tons of organic material per hectare each year, providing food to many other organisms. The forests play a crucial role as nurseries and food sources for fish, and also protect the coastline from erosion. The ecoregion is in the neotropical realm, in the mangroves biome.Шаблон:Sfn The Panama Bight Mangroves, a Global ecoregion, contains the Gulf of Panama mangroves, Esmeraldas-Pacific Colombia mangroves, Manabí mangroves and Gulf of Guayaquil-Tumbes mangroves.Шаблон:Sfn
Flora
Depending on the local topography and climate, mangrove formations include bar, inverse estuary, coastal, dwarf, border and small island.Шаблон:Sfn Compared to the Caribbean, the Pacific mangroves of Colombia have lower salinity due to the high rainfall and tidal action, and their zoning may be more dependent on stability of the substrate. The abundant nutrient-rich fresh water results in exuberant growth, with heights over Шаблон:Convert, and high production of organic detritus. Bromeliads and orchids grow on the trunks of the mangroves, and their branches hold water and falling material.Шаблон:Sfn
Mangrove species include mangle caballero (Rhizophora harrisonii), red mangrove (Rhizophora mangle), Rhizophora racemosa, Samoan mangrove (Rhizophora samoensis), nato mangrove (Mora oleifera), black mangrove (Avicennia germinans), Avicennia tonduzzii, buttonwood (Conocarpus erectus), white mangrove (Laguncularia racemosa) and tea mangrove (Pelliciera rhizophorae).Шаблон:Sfn The Conocarpus erectus mangroves are rare, found as isolated individuals.Шаблон:Sfn
Most of the mangrove forest is a transition zone in which Mora oleifera and Euterpe species dominate. Mora oleifera is endemic to the Pacific Coast from Parrita in Costa Rica to Esmeraldas in Ecuador. Further inland there are freshwater marshes with plants such as golden leather fern (Acrostichum aureum), Virola species), Campnosperma panamensis, milk tree (Brosimum utile) and palms such as Mauritiella pacifica, sheath palm (Manicaria saccata) and Euterpe cuatrecasa.Шаблон:Sfn
Common plants include Amphitecna Gentry, black calabash (Amphitecna latifolia), Crenea patentinervis, açaí palm (Euterpe oleracea), coast cottonwood (Hibiscus tiliaceus), Lonchocarpus monilis, Mora oleifera, Pavonia rhizophorae, Phryganocydia phellosperma, mangle marica (Tabebuia palustris), Tuberostylis axillaris and Tuberostylis rhizophorae. Sandy areas have field sandbur (Cenchrus pauciflorus), Homolepis aturensis, and climbers such as beach bean (Canavalia rosea), bayhops (Ipomoea pes-caprae), fiddle-leaf morning glory (Ipomea stolonifera), Pectis arenaria and St. Augustine grass (Stenotaphrum secundatum).Шаблон:Sfn Bromeliaceae and Orchidaceae epiphytes that invade the canopy include Vrissia grandioliflora, Guzmania musaica and Heliconia bihai.Шаблон:Sfn
Core samples have shown that in the south of the Gulf of Tribugá dominant populations of Rhizophora mangroves have been relatively stable for the last 4,500 years. In recent years abundant Acrostichum aureum have appeared, probably introduced by humans. In one area of the northern gulf there have been populations of Pelliciera rhizophorae for about 2,600 years, but in another area the mangroves are from recent colonization.Шаблон:Sfn
Fauna
The mangroves host invertebrates, shellfish, fish, reptiles, birds and mammals. The mangrove cockle (Anadara tuberculosa) is important for artisanal fisheries in the south-central region. Reptiles include iguanas and snakes. Mammals include oncilla (Leopardus tigrinus), coypu (Myocastor coypus), deer, lowland paca (Cuniculus paca) and white-lipped peccary (Tayassu pecari).Шаблон:Sfn The mangroves are refuges for locally or regionally threatened species including bare-throated tiger heron (Tigrisoma mexicanum), American yellow warbler (Setophaga petechia), crab-eating raccoon (Procyon cancrivorus), American crocodile (Crocodylus acutus) and spectacled caiman (Caiman crocodilus).Шаблон:Sfn
Common bivalves include Anomia fidenas, Gould's shipworm (Bankia gouldi), pleasure oyster (Crassostrea corteziensis), thin purse-oyster (Isognomon janus), striate piddock (Martesia striata) and brown falsejingle (Pododesmus foliatus). Common gastropods include mangrove periwinkle (Littoraria scabra), Littorina fasciata, Littorina varia, Littorina zebra, great pond snail (Lymnaea stagnalis), Melampus carolianus, Nassarius wilsoni, ornate nerite (Nerita scabricosta'), Thais kiosquiformis and Theodoxus luteofasciatus. Common crustaceans include grapsid crab (Armases angustum), Callodes gibbosus, Eurypanopeus transversus, Eurytium tristani, Glyptograpsus impressus, Latreutes antiborealis, Macrocoeloma villosum, Notolopas lamellatus, Panopeus chilensis, Panopeus purpureus, Pinnotheres angelicus, Cangrejo de pantano (Sesarma aequatoriale), Sholometopus occidentalis and Sholometopus rhizophorae. The mangrove tree crab (Aratus pisonii) is very common.Шаблон:Sfn
Status
The World Wide Fund for Nature gives the ecoregion the status "Critical/Endangered". Mangroves are traditionally used for fuel, construction material, fishing equipment and as a source of tannin. They are threatened by expansion of towns, aquaculture, unsustainable extraction of wood, overfishing and clearance for farms or coconut plantations. Domestic and industrial pollution is a growing problem. The ecoregion is protected in Colombia by the Sanquianga National Natural Park and the Utría National Natural Park. Civil Society Natural Reserves are also starting to protect parts of northern Colombia.Шаблон:Sfn
References
Bibliography
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- Urrego, L. E., Alexander Correa-Metrio, Catalina González-Arango, (2018). Colombian Caribbean mangrove dynamics: anthropogenic and environmental drivers. Boletín de la Sociedad Geológica Mexicana, 133.
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