Laurisilva

Laurisilva is a type of subtropical or temperate broadleaf forest characterized by evergreen, laurel-like trees and a rich understory of ferns and mosses, historically widespread across regions of the Tertiary Paleogene and Neogene epochs. These forests persist today in fragmented refugia on oceanic islands and coastal mountains influenced by humid Atlantic and Pacific currents, and have been the focus of studies by institutions such as the International Union for Conservation of Nature, the Royal Society, the United Nations Educational, Scientific and Cultural Organization, and botanical gardens including the Kew Gardens and the Missouri Botanical Garden.

Description and Distribution

Laurisilva occurs as evergreen, broad-leaved forests dominated by families such as Lauraceae, Myrtaceae, and Fagaceae in insular and montane settings, forming closed canopies with prolific epiphytes like Polypodiaceae, Bromeliaceae, and mosses commonly surveyed by researchers from the Smithsonian Institution and the Natural History Museum, London. Major extant areas include the laurel forests of the Macaronesia archipelagos—Madeira, the Azores, and the Canary Islands—as well as relic pockets in Japan (e.g., Yakushima), the Laurentian Mountains are not laurisilva but similar floras occur in parts of New Zealand and Chile including the Valdivian temperate rain forest. These stands are mapped by conservation agencies such as the European Environment Agency and protected under designations including World Heritage Site listings, national parks like Garajonay National Park and regional reserves administered by governments such as the Portuguese Republic and the Spanish Government.

Ecology and Biodiversity

The laurel forests support extraordinarily high levels of endemism among plants and animals; botanists from the Royal Botanic Gardens, Kew and zoologists from the Natural History Museum, London have documented endemic genera in Lauraceae, as well as endemic invertebrates including taxa studied by the Entomological Society of America and the Zoological Society of London. Faunal assemblages include birds recorded by the British Ornithologists' Union and Cornell Lab of Ornithology (e.g., island endemics), reptiles catalogued by the Herpetological Society of Japan, and numerous mollusks and insects described in journals of the Linnean Society of London. Fungi and lichens identified by mycologists at the Royal Botanic Gardens, Kew and the California Academy of Sciences form essential nutrient cycles cited in reports by the Intergovernmental Panel on Climate Change and studies published through the American Museum of Natural History. Keystone species and mutualisms involving pollinators documented by the International Union for Conservation of Nature and seed dispersers studied by researchers at University of Cambridge and Harvard University underpin community resilience against invasive taxa reviewed by the European Commission and the United Nations Environment Programme.

Geological and Climatic Influences

Laurisilva distribution reflects paleoclimatic stability since the Cenozoic and geomorphological features associated with volcanic islands like Madeira and Yakushima and coastal mountains such as the Sierra Nevada de Santa Marta and the Andes in Chile and Argentina, described in geological syntheses from the United States Geological Survey and the British Geological Survey. Oceanic currents including the North Atlantic Drift and climatic phenomena such as the El Niño–Southern Oscillation and the North Atlantic Oscillation modulate humidity and temperature regimes critical for laurel forest persistence, as modeled by climate groups at NASA and the European Centre for Medium-Range Weather Forecasts. Soil development on volcanic substrates studied by teams at the Max Planck Society and the French National Centre for Scientific Research influences nutrient cycling, while Pleistocene refugia hypotheses tested using genetic data from laboratories at University of Oxford and Stanford University illuminate historical connectivity among island and continental populations.

Human Interaction and Cultural Significance

Humans have interacted with laurel forests through traditional uses of timber and non-timber products documented in ethnobotanical surveys by the Royal Botanic Gardens, Kew and the Smithsonian Institution, and through cultural representations in literature and art by figures associated with the Romantic movement and modern writers from Portugal and Spain. Colonial-era exploitation by entities such as the Portuguese Empire and the Spanish Empire and later land-use changes under administrations like the Government of the Canary Islands and the Government of Madeira altered forest extent, while contemporary eco-tourism managed by agencies including the European Commission and local municipalities supports regional economies. Research collaborations among universities—University of Lisbon, University of La Laguna, University of Madeira—and conservation NGOs such as BirdLife International and the World Wide Fund for Nature document cultural heritage and traditional ecological knowledge associated with laurisilva landscapes.

Conservation and Threats

Conservation priorities for these forests are coordinated by organizations including the International Union for Conservation of Nature, United Nations Educational, Scientific and Cultural Organization, and regional authorities like the Government of Spain and the Government of Portugal through protected areas, recovery plans, and invasive species control targeting taxa recorded by the European Environment Agency and the Global Invasive Species Database. Major threats are invasive plants and animals documented by the Invasive Species Specialist Group, changes in fire regimes assessed by the European Forest Fire Information System, and climate change impacts projected by the Intergovernmental Panel on Climate Change and modeled by climate research centers at NOAA and Met Office. Conservation strategies promoted by groups such as Conservation International and the WWF include restoration ecology led by researchers at University of California, Berkeley and University of Cambridge, ex situ collections maintained at institutions like Kew Gardens and seed banking efforts guided by the Millennium Seed Bank Partnership, alongside legal protections under national legislation and international agreements like the Convention on Biological Diversity and the Ramsar Convention.

Category:Forests