Leeward Islands moist forests

Leeward Islands moist forests
Name	Leeward Islands moist forests
Biome	Tropical and subtropical moist broadleaf forests
Region	Caribbean
Countries	Antigua and Barbuda, Barbados, Saint Kitts and Nevis, Anguilla (UK), Montserrat, Guadeloupe, Dominica, Saint Martin (island), Saint Barthélemy
Area km2	5000
Conservation status	Vulnerable

Leeward Islands moist forests

The Leeward Islands moist forests form a group of tropical moist broadleaf ecoregions distributed across the Leeward Islands (Caribbean), including political entities such as Antigua and Barbuda, Saint Kitts and Nevis, Montserrat, and parts of the French West Indies like Guadeloupe and Dominica. The ecoregion is bounded by adjacent marine zones including the Caribbean Sea and the Atlantic Ocean and interfaces with other ecoregions such as the Puerto Rican moist forests and the Windward Islands moist forests. Its conservation importance has attracted attention from organizations including the World Wildlife Fund, the International Union for Conservation of Nature, and regional bodies like the Caribbean Community.

Geography and extent

The ecoregion occupies volcanic and limestone islands of the Leeward Islands (Caribbean), from Anguilla (UK) and Saint Martin (island) in the north through Antigua and Barbuda and Saint Kitts and Nevis to Montserrat and the northern parts of Guadeloupe and Dominica. Topography ranges from low coastal plains to upland volcanic peaks such as Nevis Peak, Soufrière Hills, and Bois Diable with elevation influencing habitat mosaics. The islands sit within the Lesser Antilles volcanic arc and share geologic history with Puerto Rico and the Greater Antilles via plate interactions of the Caribbean Plate and the North American Plate. Major human settlements on these islands include St. John's, Basseterre, Plymouth, Montserrat, and Basse-Terre.

Climate and ecoregion characteristics

The climate is tropical oceanic, influenced by the Northeast Trade Winds, seasonal shifts of the Intertropical Convergence Zone, and episodic events such as Atlantic hurricane season cyclones including historical storms like Hurricane Irma (2017) and Hurricane Maria (2017). Rainfall gradients vary from leeward rain-shadowed coasts to windward windward-facing slopes with orographic precipitation observed on peaks like Morne Diablotins. Mean annual temperatures are moderated by sea breezes near ports such as Brades and The Valley, while montane cloud layers create humid conditions similar to those in El Yunque National Forest on Puerto Rico. The ecoregion supports closed-canopy forests, secondary woodlands, and riparian corridors adjacent to freshwater systems such as the Cayon River.

Flora and vegetation communities

Vegetation includes lowland semi-deciduous forests, mesic montane forests, dry limestone woodlands, and mangrove stands along sheltered bays such as English Harbour and White Bay. Dominant tree genera include Cedrela, Sideroxylon, Tabebuia, Ficus, and Guarea, with understory components featuring Heliconia, Piper, and various orchid genera found in regional herbaria collections like those at the Royal Botanic Gardens, Kew and the Smithsonian Institution. Endemic plant taxa occur in isolated montane refugia and limestone karst outcrops, comparable to endemism patterns in the Bahamas and Cuba. Human-introduced species from historical trade routes and colonial agriculture include Citrus varieties brought by settlers from Spain and France, as well as timber species utilized during colonial enterprises tied to companies like the East India Company.

Fauna and endemism

Faunal assemblages feature Caribbean-specialist birds, reptiles, amphibians, and invertebrates with island-level endemism documented for taxa comparable to species in Saint Lucia, Barbados, and Jamaica. Notable avifauna includes congener groups seen in Carib-region checklists and regional databases maintained by institutions such as the American Museum of Natural History and BirdLife International. Reptiles and amphibians demonstrate microendemism on volcanic peaks and limestone karst, paralleling patterns in the Virgin Islands National Park. Marine-adjacent faunas include seabirds using colonies recognized by the Ramsar Convention and migratory species listed by the Convention on Migratory Species.

Human impacts and land use

Land-use history reflects colonial-era plantation systems tied to sugar trade routes and plantations administered from colonial capitals like Bridgetown and Basseterre, with legacies in soil erosion and secondary succession. Contemporary pressures include urban expansion in capitals such as St. John's and Roseau, tourism development around sites like Nevis Peak, agricultural conversion for crops linked to export markets like banana systems, invasive species introductions documented by the Invasive Species Specialist Group, and impacts from extractive activities historically governed by colonial statutes such as The Navigation Acts. Natural disasters, including Soufrière Hills volcanic eruption (1995–present) and major hurricanes, have reshaped land cover and driven migration to metropolitan centers like Castries.

Conservation and protected areas

Conservation responses include establishment of protected areas, community reserves, and marine protected areas coordinated with regional programs like the Caribbean Biodiversity Fund and international agreements such as the Convention on Biological Diversity. Notable protected areas and conservation initiatives occur on islands with designated sites similar to Montserrat Volcano Observatory-adjacent reserves, management at Guadeloupe National Park, and Ramsar-designated wetlands near sites such as Wallblake Bay. Conservation priorities emphasize invasive species control, habitat restoration modeled on projects by the Nature Conservancy, and biodiversity surveys supported by research institutions including the University of the West Indies and the Royal Society. Cross-jurisdictional efforts engage governments of France, United Kingdom, and independent states to align protections with UNESCO biosphere reserve criteria and regional climate resilience funding from multilateral lenders like the Inter-American Development Bank.

Category:Ecoregions of the Caribbean