The Venezuelan Andes montane forests (NT0175) is an ecoregion in the northern arm of the Andes in Venezuela.
It contains montane and cloud forests, reaching up to the high-level Cordillera de Merida páramo high moor ecoregion.
The forests are home to many endemic species of flora and fauna.
Their lower levels are threatened by migrant farmers, who clear patches of forest to grow crops, then move on.
Geography
Location
The Venezuelan Andes montane forests ecoregion covers most of the Venezuelan states of Mérida and Trujillo, much the state of Táchira and the highlands of the states of Lara and Barinas.[1]
It includes a small area in Colombia.
It covers the lower part of the Venezuelan extension of the Cordillera Occidental of the northern Andes.
It has an area of 2,952,586 hectares (7,296,000 acres).[2]
The Venezuelan Andes montane forests ecoregion contains the high altitude cloud forests of the Venezuelan Andean Cordillera, which reaches altitudes of 4,000–5,007 metres (13,123–16,427 ft)..
This is a northeastern branch of the Andes that is separated from Colombia's Cordillera Oriental by the Táchira depression on the Venezuela–Colombia border.
The ecoregion extends from the Táchira depression for about 450 kilometres (280 mi) in a northeast direction to the Barquisimeto depression.
The ecoregion also includes the forests of the isolated Tamá Massif, which lies between the Colombian Andes and the Táchira depression.[1]
The mountains were formed during the Paleocene epoch and continued rising until the end of the Pliocene epoch.
They are mainly composed of quartziteschist, gneiss and limestone, with isolated intrusions of granite and diabase.
The soils are mostly inceptisols, but entisols are often found in slopes and eroded areas.
The rivers that form near the summits create large valleys that form physiographical barriers between the ranges of the Cordillera.
The largest, the Chama, crosses the northeast–southwest axis of the middle part of the Cordillera, dividing into the Cordillera de Mérida to the south and the Sierra de la Culata to the north.
Other major rivers are the Santo Domingo, Boconó and Motatán.[1]
Climate
Climate zones. The coolest areas are the páramos (dark blue and purple).
The Köppen climate classification is "Cfb": warm temperate, fully humid, warm summer.[4]
From 800 to 2,500 metres (2,600 to 8,200 ft) in elevation the average annual temperatures are 24–12 °C (75–54 °F).
Temperatures are lower above this elevation.
The northeastern trade winds strongly affect the climate.
There is a dry season from December to April and a wet season from April to November when moisture is carried from the Intertropical Convergence Zone.
Average annual rainfall is 2,000 to 3,000 millimetres (79 to 118 in), but varies considerably from place to place.
Along the southeastern slopes high rainfall starts above 2,400 metres (7,900 ft), while along the northwest slopes high rainfall starts at 1,200 metres (3,900 ft).
Slopes in the interior valleys are dry, and often very dry.[1]
Vegetation includes evergreen transition forests between 800 metres (2,600 ft) and 1,800–2,000 metres (5,900–6,600 ft) and evergreen cloud forests higher up.
The evergreen transition forests are dense, with two or three layers, with most trees of the families Lauraceae, Moraceae, Myrtaceae, Bignoniaceae, Euphorbiaceae and Araliaceae.
From 2,000 to 3,000 metres (6,600 to 9,800 ft) there are very dense cloud forests with two or three layers, many epiphytes and a rich understory.
Common species are Retrophyllum rospigliosii, Prumnopitys montana, Podocarpus oleifolius, Alnus jorullensis, Oreopanax moritzii, Brunellia integrifolia, Hedyosmum glabratum, Weinmannia jahnii, Weinmannia microphylla, Tetrorchidium rubrivenium, Beilschemieda sulcata, Ruagea glabra and Ruagea pubescens.[1]
The montane forests and páramos of Mérida have 155 endemic plant species, and contains 30% of the ecoregion's endemic flora.
The forests and páramos of the isolated Tamá massif have another 82 endemic plant species.
Common montane forest endemic plants are Podocarpus pedulifolius, Oreopanax veillonii, Psychotria aristeguiateae, Lagenanthus princeps, Delostoma integrifolium, as well as bromeliad, fern and orchid species.[1]
There are four endemic mammal species in the ecoregion.
The wood sprite gracile opossum (Gracilinanus dryas) and Luis Manuel's tailless bat (Anoura luismanueli) are found in both the Andean Cordillera and the Tamá Massif.
The dressy Oldfield mouse (Thomasomys vestitus) is found only in the Andean Cordillera.
Musso's fish-eating rat (Neusticomys mussoi) has been reported for just one place in the Andean Cordillera.
Mammal subspecies found only in the montane forests ecoregion and the Cordillera de Mérida Páramo ecoregion include the Andean white-tailed deer (Odocoileus virginianus goudotii), found in the ecotone between the high montane forests and the páramos, and the rufous little red brocket (Mazama rufina bricenii), found in evergreen forest and páramos from 1,000–3,000 metres (3,300–9,800 ft).
Both deer species are endangered by hunting.[1]
In the forest margins beside the páramos the crab-eating rat (Ichthyomys hydrobates), which is restricted to the Andes in Venezuela and Colombia, is threatened by changes to its habitat, and the pacarana (Dinomys branickii), widespread in the Andes, is threatened by hunting.
The endangered spectacled bear (Tremarctos ornatus) is found throughout the Andes from Bolivia to Venezuela.
In Venezuela it is found between 380 and 4,700 metres (1,250 and 15,420 ft) in the Andes and Serranía del Perijá, most often in cloud forests between 1,000 and 3,000 metres (3,300 and 9,800 ft).
It has low rates of reproduction and is threatened by hunting and destruction of habitat.[1]
Endangered mammals include Geoffroy's spider monkey (Ateles geoffroyi) and Musso's fish-eating rat (Neusticomys mussoi).[5]
The World Wildlife Fund gives the ecoregion the status "Vulnerable".
The low to mid-altitude montane forests are being invaded by migrant farmers, who fragment the habitat.
This is the main threat, but extraction of valuable orchids and bromeliads is also an issue.
Requests, so far refused, have been made for permits to mine for zinc, cooper, lead and silver in the Bailadores–Guaraque region, including the General Pablo Peñalosa National Park.
Coal mining in the Táchira depression may threaten the adjacent Tamá Masif.[1]
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