This largely untouched, inaccessible expanse of jungle receives some of the planet's highest rates of precipitation, with the average rainfall measuring anywhere from 4,000 mm to 9,000 mm (around 13-30 ft) per year. Combined with high humidity and daily average temperatures of around 23.89 °C (75 °F), the foundation is set for a lush landscape brimming with species, harboring a huge wealth of plant, animal and fungalbiodiversity. Many of the dominant tree species within the north of the ecoregion belong to such genera as the bongo (Cavanillesia), wild cashew (Anacardium), rubber trees (Havea) and kapok fiber trees (Ceiba). In more wet, flooded areas, the cativo (Prioria copaifera)—a hardwood tree in the legume family, Fabaceae—is common. Numerous epiphyticlianas (vines and crawlers) belonging to the family Araceae use these trees for support systems (such as Anthurium, Monstera and Philodendron). Growing along the sheltered forest floor are unique and varied species of plant families like Marantaceae, Piperaceae, Orchidaceae and Bromeliaceae, as well as many ferns, jungle cacti, mosses and lichens, among others.
However, while most of the forest is relatively intact, many of its human inhabitants endure some of the highest levels of poverty within Colombia and Panamá, respectively. With such a difficult environment to access, and with relatively few options to climb the socioeconomic "ladder", certain areas of the forest have been significantly altered for ranching and agriculture, and the land is continuously being threatened by the prospects of oil, logging and paper pulp industries, as well as the unregulated mining of gold (and other metals), coca growing (with armed guards) and more—both official and clandestine. Thankfully, much of the forest, especially the central part of the ecoregion, is currently still pristine and relatively untouched.
Geography
Location
The Chocó–Darién moist forest extends along most of the Pacific west coast of Colombia and northeastward, into Panamá and the infamous Darién Gap, before reaching the Caribbean coast of Colombia. The forests are bounded to the east by the Andes, which separates them from the Amazon and Orinoco basin eco-regions of Brazil, Venezuela and eastern Colombia. The forests have an area of 7,355,566 hectares (18,176,000 acres).[3]
The ecoregion is between the Pacific Ocean and the Western Ranges of the Andes, with elevations from sea level to about 1,000 metres (3,300 ft).
It includes the western slopes of the Andes and the Cerro Torrá, Serranía del Darién, Sierra Llorona de San Blas and Serranía del Baudó massifs.
Terrain includes recently formed alluvial plains, hills formed in the Tertiary and Pleistocene from dissection of sediments, and older Mesozoic era rocks in the mountains.
The soils are typically red clay laterite, leached of most nutrients by the heavy rain.
Younger and more fertile soils are found along the Andes and in the main river floodplains.[1]
Subregions include the hilly region of Darién and Urabá in the north; the Pacific coastal zone with elevations up to about 500 metres (1,600 ft); the central strip; the hills of the El Carmen de Atrato and San José del Palmar municipalities; and the rainforest along the western Andes up to an elevation of about 1,000 metres (3,300 ft).
The ecoregion contains the basin of the Atrato River in the north, and further south the basins of the Baudó, San Juan, San Juan de Micay and Patía rivers.
The heavy rainfall gives these rivers great power, cutting deep gorges through the mountains with dramatic falls and rapids in the upper reaches.
Lower down the rivers broaden out and meander through the plains.[1]
Climate
Annual temperatures average 23.6 °C (74.5 °F), ranging from a minimum of 18.6 °C (65.5 °F) to a maximum of 30 °C (86 °F).
Annual rainfall is from 4,000 to 9,000 millimetres (160 to 350 in). The central region receives the most rain, in some areas as high as 13,000 millimetres (510 in), while the north and south are comparatively drier, and in some parts have short dry seasons in January–March.[1]
At a sample location at coordinates 5°45′N77°15′W / 5.75°N 77.25°W / 5.75; -77.25 the Köppen climate classification is "Af": equatorial; fully humid.[5]
Mean temperatures range from 24.8 °C (76.6 °F) in October–November to 25.8 °C (78.4 °F) in April.
Annual rainfall is about 6,500 millimetres (260 in).
Monthly rainfall ranges from 347.6 millimetres (13.69 in) in March to 654.1 millimetres (25.75 in) in October.[5]
There are at least 8,000 vascular plant species in the ecoregion, perhaps over 10,000 of which (almost 20%) are found nowhere else.
The mix of flora depends on elevation, water levels and the influence of the sea.
Many species are locally endemic, found only in small regions, so there is considerable diversity from one area to another.
There are no endemic families, but several endemic genera. Some genera, such as Trianaeopiper and Cremosperma, have many species.[1]
The central zone has rain forests at higher altitudes and wet or very wet forests lower down.
Vegetation includes formations that would otherwise be found only in cloud forests, with thick moss and other types of non-vascular epiphytes on the tree trunks and branches, and with diverse species of woody hemiepiphyte lianas of the Ericaceae, Marcgraviaceae and Melastomataceae families.
There are many slender trees.[1]
In the north and south near the coast, where there is a dry season, there are greater numbers of deciduous plants.
Above an elevation of 600 metres (2,000 ft) common species include Inga species, cariseco (Billia colombiana), Brosimum species, Sorocea species, Jacaranda hesperia, Pourouma bicolor, Guatteria ferruginea, Cecropia species, Elaegia utilis and Brunellia species.[1]
There is high diversity of fauna in the Chocó–Darién moist forests ecoregion, and many endemic species.
The extremely high rainfall makes it difficult for many vertebrates to travel, forming gap in the distribution of several primates and other mammals.
Vulnerable or endangered mammal species include Geoffroy's tamarin (Saguinus geoffroyi), giant anteater (Myrmecophaga tridactyla), cougar (Puma concolor), ocelot (Leopardus pardalis) and jaguar (Panthera onca).[1]
Other endangered mammals include black-headed spider monkey (Ateles fusciceps), Geoffroy's spider monkey (Ateles geoffroyi), Gorgas's rice rat (Oryzomys gorgasi) and Baird's tapir (Tapirus bairdii), Titan beetle (Titanus giganteus).[7]
The World Wide Fund for Nature (WWF) gives the region the status of "Relatively Stable/Intact".
The northern parts in Colombia have mostly been replaced by banana plantations and cattle ranches.
The southern areas have been partly replaced by oil palm plantations, and are being deforested for paper pulp.
Most of the intact forest is in the central area.
However, the remaining blocks of habitat in 1995 were large, intact and well-connected.
There is high potential for research and ecotourism.
Some areas of secondary forest may be almost 500 years old, suitable for research into tropical forest regeneration.[1]
As of 1995 10% to 20% of the original habitat had been destroyed, with one source at the time claiming 3.5% was being altered each year.
The Chocó forests supply half of Colombia's wood, and the main threat comes from deforestation and resultant erosion.
As of 1990 about 600 square kilometres (230 sq mi) was being deforested annually.
The Inter-American Highway in the Darien region is causing degradation of the habitat.
Industrial development is a threat.
The naval base at the entry to Málaga Bay may disrupt humpback whale reproduction.
Other threats come from plantations of African oil palm (Elaeis guineensis), gold mining and coca growing.[1]
About 30% of the 13,335 square kilometres (5,149 sq mi) of the ecoregion in Panama is protected to some extent.
The 597,000 hectares (1,480,000 acres) Darién National Park is also a UNESCO World Heritage Site.
Other areas with some protection in Panama include the 3,200 square kilometres (1,200 sq mi) Kuna-Yala indigenous reserve and the 4,326 square kilometres (1,670 sq mi) Embera Wounan reserve.
Other parts of the ecoregion in Panama have been set aside as mining reserves or are used for agriculture.[1]
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