Cloud forest

Cloud forest
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Name	Cloud forest
Biome type	Montane tropical and subtropical moist broadleaf forest
Climate	Tropical montane cloud
Distribution	Tropical Americas, Africa, Asia, Oceania
Conservation status	Threatened

Cloud forest Cloud forests are high-elevation, moisture-rich montane forests characterized by near-constant canopy-level cloud cover and persistent mist. These ecosystems occur on mountains and highlands across the Neotropics, Afrotropics, Indomalaya, and Australasia, supporting high endemism and specialized hydrological functions.

Definition and Distribution

Cloud forests are defined by frequent horizontal precipitation from fog and cloud immersion rather than by latitude alone, and are often associated with orographic uplift on windward slopes of mountain ranges. Notable regions include the Andes, Sierra Madre de Chiapas, Central American cordillera, Guinean Highlands, East African Rift, Western Ghats, Annamite Range, Himalayas, Mount Kinabalu, New Guinea Highlands, Great Dividing Range, and islands such as Taiwan, Borneo, Sumatra, Sulawesi, Madagascar, and Sri Lanka. Important protected areas and reserves include the Monteverde Cloud Forest Reserve, Manu National Park, Cajas National Park, Bwindi Impenetrable National Park, Mount Kenya National Park, Sinharaja Forest Reserve, Kinabalu Park, Daintree National Park, and the Central Catchment Nature Reserve. Cloud forest belts vary with altitude: in the Talamanca range and Cordillera de Talamanca they occur at different elevational bands than on the Andes or Rwenzori Mountains.

Climate and Hydrology

The microclimate is dominated by low-level stratiform cloud layers driven by regional wind patterns such as the Intertropical Convergence Zone, trade winds, and monsoonal flows like the Southwest Monsoon and Northeast Monsoon. Fog interception and horizontal precipitation contribute substantially to water budgets, sustaining headwaters for rivers like the Amazon River, São Francisco River, Marañón River, Río San Juan, Ganges River, Yangtze River, and numerous coastal catchments. Cloud forests influence regional hydrology through processes studied by institutions including the Smithsonian Institution, International Union for Conservation of Nature, World Wide Fund for Nature, and research programs at universities such as University of Costa Rica, Universidad Nacional de Colombia, Makerere University, University of Nairobi, Jawaharlal Nehru University, and Australian National University. Elevation-dependent warming documented by the Intergovernmental Panel on Climate Change shifts cloud base heights, altering fog frequency and affecting streamflow regimes monitored under projects like the Global Environment Facility–supported initiatives and regional river basin authorities.

Ecology and Biodiversity

Cloud forests harbor high levels of endemism in plants, vertebrates, and invertebrates, with dominant taxa including families such as Lauraceae, Myrtaceae, Ericaceae, and genera like Quercus, Podocarpus, and Miconia. Epiphytes—orchids, bromeliads, mosses, and liverworts—are abundant; notable orchid-rich areas involve sites studied by the Royal Botanic Gardens, Kew, Missouri Botanical Garden, and the New York Botanical Garden. Faunal assemblages include endemic birds like the Resplendent quetzal, Andean cock-of-the-rock, Kakapo (historic analogs on islands), and montane specialists such as African grey parrot populations in adjacent forests, as well as threatened amphibians including species discovered by researchers affiliated with Conservation International and the EDGE of Existence programme. Mammals range from small carnivores studied by Smithsonian Tropical Research Institute teams to primates in the Atlantic Forest and Madagascar such as lemur species documented by the Durrell Wildlife Conservation Trust. Mycorrhizal networks and decomposition processes involve fungal partners researched at institutions such as Fungal Conservation Society collaborators. Pollination and seed dispersal link to frugivores and hummingbirds recorded by ornithologists from the American Ornithological Society and the British Ornithologists' Union.

Threats and Conservation

Cloud forests face threats from deforestation for agriculture and cattle ranching promoted historically by policies influenced by entities like the World Bank and expansion of cash crops such as coffee and cacao. Infrastructure development including road construction and hydropower projects by multinational firms and national agencies affects connectivity and watershed functions governed by agreements like transboundary basin commissions. Climate change projections by the Intergovernmental Panel on Climate Change and regional assessments from the United Nations Environment Programme indicate upward shifts of cloud bases, contraction of suitable habitat, and increased fire risk noted in studies by the International Centre for Integrated Mountain Development and national meteorological services. Conservation responses include protected area designation (e.g., UNESCO World Heritage Site listings), payment for ecosystem services schemes pioneered in Costa Rica and supported by organizations such as the World Resources Institute and The Nature Conservancy, and community-based management models promoted by NGOs like Rainforest Alliance and Conservation International. Restoration projects often involve botanical gardens and seed banks including Kew Millennium Seed Bank Partnership and regional conservation units coordinating with indigenous groups represented in forums such as the United Nations Permanent Forum on Indigenous Issues.

Human Use and Cultural Significance

Human communities in cloud forest regions include indigenous and Afro-descendant peoples with distinct cultural ties to montane landscapes: examples include the Ngäbe-Buglé, Bribri, Miskito, Quechua, Aymara, Kichwa, Shuar, Mayan peoples, Bakiga, Meru people, Tamil communities in hill regions, and Batak groups. Traditional uses encompass medicinal plants catalogued by ethnobotanists from Royal Botanic Gardens, Kew and universities such as University of Oxford and Harvard University, agroforestry systems producing specialty coffee linked to certifications like Fairtrade and export markets regulated by trade agreements, and spiritual values embedded in cultural landscapes protected under national cultural heritage laws and organizations such as ICOMOS. Eco-tourism in reserves like Monteverde, guided by NGOs and local cooperatives, generates revenue but also raises governance questions handled in part by multilateral donors including the Inter-American Development Bank and Asian Development Bank. Artistic and literary representations of montane mist forests appear in works by writers associated with the Latin American Boom and naturalists from institutions like the Smithsonian Institution.

Category:Forests