Lesser Antillean dry forests | |
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Ecology | |
Realm | Neotropic |
Biome | Tropical and subtropical moist broadleaf forests |
Borders | |
Geography | |
Area | 130 km2 (50 sq mi) |
Country | Dominica, Martinique, Saint Lucia, Saint Vincent and the Grenadines, Grenada |
Coordinates | 13°50′02″N61°03′43″W / 13.834°N 61.062°W |
The Lesser Antillean dry forests ecoregion (WWF ID: NT0220) covers the dry forests of the coastal lowlands of the Lesser Antilles, where the eastern Caribbean Sea meets the Atlantic Ocean. These forests generally form a band around the interior wet forests of higher elevations, and because they are often flat, they are under the most pressure for human settlement and agriculture. [1] [2] [3] [4]
The primary islands in this ecoregion with drye forests are Guadeloupe, Dominica, Martinique, Saint Lucia, Saint Vincent and the Grenadines, and Grenada. The islands are part of a volcanic arc; their interiors generally have mountainous highlands that catch more rainfall, and thus support moist forests of the Windward Islands moist forests ecoregion. The largest area of dry forests on the islands is on Saint Lucia, where the dry forests ring the coast to about 3 km into the interior, where higher elevations grade into moist forest. The same pattern holds on the island of Grenada. On the islands of Saint Vincent and Martinique, the dry forests occur in the thin transition band between the coastal dry shrubland and the upland moist forest. [2]
The climate of the ecoregion is Tropical rainforest climate (Köppen climate classification (Af)). This climate is characterized as hot, humid, and having at least 60 mm of precipitation every month. [5] [6] Precipitation is slightly higher than that of the coasts, which range from 1,000 mm/year on Dominica to 1,600 mm/year on St. Vincent. [4]
The dry forest ecoregion is 35% closed canopy, 20% open forest, 15% built-up urban area, 10% in agricultural use and the remainder in shrubs or open water. [3] Characteristic tree species of the dry forest include those of genus Didymopanax and Charianthus . Mosses and ferns are common. The soils are often disturbed by past agricultural use. [4]
The lesser Antillean bullfinch is a species of bird in the family Thraupidae. It is found in Saint Barth, Saint Martin, Anguilla, Antigua and Barbuda, Dominica, Grenada, Guadeloupe, Martinique, Montserrat, Netherlands Antilles, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, the British Virgin Islands, and the U.S. Virgin Islands.
The Caribbean bioregion is a biogeographic region that includes the islands of the Caribbean Sea and nearby Atlantic islands, which share a fauna, flora and mycobiota distinct from surrounding bioregions.
The Hainan Island monsoon rain forests ecoregion covers mountainous interior of Hainan Island in China. The tropical forests receive over 1,000 mm/year of rain, heavily concentrated in the summer rainy season. The island has high levels of biodiversity, with over 4,200 plant species, 630 of which are endemic to the island. The region is under ecological pressure from deforestation for agriculture and timber extraction.
The Southern Vietnam lowland dry forests ecoregion covers the low, relatively arid coastal strip of southern Vietnam on the South China Sea. The region is in the rain shadow of the Southern Annamite Range, which blocks humid air from the west. Although approximately half of the ecoregion is forested to some degree, most has at some point been cleared for agriculture or degraded by extraction of hardwoods. There are few protected areas.
The Eastern Java–Bali montane rain forests ecoregion covers the higher altitude mountain rainforests on the eastern side of the island of Java, and most of the center of the island of Bali in Indonesia. The region has a number of active volcanoes, but is under pressure from growing human populations pushing into higher elevations and more marginal land. With elevations rising from sea level to 3,426 metres (11,240 ft), and precipitation varying between rainforest and drier forest levels, the area has many different forest types – evergreen, deciduous and semi-alpine.
The Eastern Java-Bali rain forests ecoregion covers the lowland areas of the eastern half of the island of Java, and the island of Bali, in Indonesia. This ecoregion is distinct from the Eastern Java-Bali montane rain forests, which exists at higher elevations where mountain forest habitat dominates. Very little of the natural lowland rainforest remains in its pre-human settlement state.
The Western Java rain forests ecoregion covers the lowland rain forests below 1,000 meters in elevation in the western half of the island of Java in Indonesia. There are a variety of forest types - evergreen, semi-evergreen, moist deciduous, and even some patches of freshwater swamp. The forests have degraded by conversion of the low areas to agriculture, and by logging. National parks protect some of the last remaining untouched rain forest. A number of endangered mammals are found in the ecoregion, including the Javan rhinoceros, the silvery gibbon, and the Javan surili.
The Central American Atlantic moist forests ecoregion covers the lowland coastal forests of Honduras, southeast Guatemala, and the eastern forests of Nicaragua. Half of the ecoregion is closed-canopy tropical broadleaf evergreen forest, with tree heights reaching 50 meters. This ecoregion has the largest single fragment of natural forest in Central America, with a size of 14,629 square kilometres (5,648 sq mi). The total area is 89,979 square kilometres (34,741 sq mi).
The Costa Rican seasonal moist forests ecoregion covers the Pacific Slope of the volcanic mountain range of northwestern Costa Rica and the extreme south of Nicaragua. The area has a distinct dry season during which the characteristic deciduous trees drop their leaves. The forests themselves have been highly degraded in the past by human conversion to agriculture and settlement. The Costa Rican capital city of San Jose is in the middle of this ecoregion.
The Isthmian–Pacific moist forests ecoregion covers the lowland tropical evergreen forests on the Pacific side of the central mountains of southern Costa Rica and western Panama. As the meeting zone between North and South American floral communities, the area is one of very high biodiversity. Much of the rainforest has, however, been cleared for subsistence agriculture and cattle grazing.
The Panamanian dry forests ecoregion covers low-lying dry forests around the coast of the Gulf of Panama on the Pacific Ocean side of Panama. It is one of the most heavily degraded ecoregions in Central America, having been heavily converted to agriculture. However, it is also important for its high biodiversity, high rates of endemic species, and its importance as a biological corridor between the moist forests inland and the mangroves on the coast.
The Miskito pine forests ecoregion covers lowland pine forests and savanna along much of the Mosquito Coast in northeastern Nicaragua and southeastern Honduras. Pines are adapted to grow in the poor soil, relative to the surrounding moist forest, and repeated burning have left one species – the Caribbean pine – dominant. Although the ecoregion receives high levels of rain, the hard soils, repeated burning, and exposure to hurricanes have left expanses of 'pine savanna' and seasonal wetlands. The area is thinly settled by humans and there is little crop agriculture.
The Lesser Antilles mangroves ecoregion covers the salt-water habitats along the coasts of the islands on the divide between the Caribbean Sea and the Atlantic Ocean. the included islands stretch from Anguilla in the north to the island of Grenada in the south. The species diversity of these small islands is less than that of the larger islands of the Greater Antilles with to the west, but endemism is high due to the relative isolation of the different islands.
The Leeward Islands moist forests ecoregion covers the forested areas of the Leeward Islands on the northeastern edge of the Caribbean Sea, stretching from the Virgin Islands in the west to Guadeloupe to the southeast. The forested areas are typically in the core interior of the islands, and at the higher elevations of the volcanic islands. Non-forested lower elevations in the region receive less rainfall and are typically semi-arid. A notable feature of the ecoregion is its position in the main hurricane track. The frequent damage to trees produces in many places an uneven forest canopy, and an opening of the canopy that allows more pre-climax trees to grow.
The Leeward Islands xeric scrub ecoregion covers the dry ('xeric'), non-forested areas of the Leeward Islands on the northeastern edge of the Caribbean Sea, stretching from the Virgin Islands in the west to Guadeloupe to the southeast. The non-forested areas are generally low scrub shrub, on the low elevations around the peripheries of the islands. Non-forested lower elevations in the region receive less rainfall and are typically semi-arid. A notable feature of the ecoregion is its position in the main hurricane track. The frequent damage to trees allows more pre-climax shrubs and trees to grow. There are a number of endemic species, as in common with islands.
The Trinidad and Tobago moist forests ecoregion covers most of Trinidad Island and Tobago Island near the coast of South America where the southeastern Caribbean Sea meets the Atlantic Ocean. Small portions of the islands around river estuaries and coastal lowlands are mangroves or dry forests. Species diversity is very high, in particular for plants and birds. Tobago, being much smaller, has fewer species.
The Windward Islands xeric scrub ecoregion covers the relatively small areas of the Windward Islands that receive low levels of precipitation. The dry areas of these islands are the low coastal areas that receive less precipitation. Because the dry scrub land is generally flat, near the coast, and not as obviously in need of conservation as the upland forests of the interior, they are more vulnerable to human settlement and development for agriculture.
The Windward Islands moist forests ecoregion covers forested, high-precipitation areas of the volcanic Windward Islands. The forested areas are mostly at higher elevations in the interior of the islands, surrounded by dry forests, dry shrubland, or mangroves on the flat coastal lowlands. Closed forest of this ecoregion cover the majority of the islands. Species diversity is very high.