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| oak savanna | |
|---|---|
| Name | Oak savanna |
| Climate | Temperate |
| Biome | Grassland |
| Dominant plants | Quercus spp. |
| Region | North America, Europe |
oak savanna
Oak savanna is a temperate grassland-woodland mosaic characterized by widely spaced Quercus dominated trees over a continuous herbaceous layer. These ecosystems have been described in literature associated with the Midwestern United States, Great Plains, Mediterranean Basin, and parts of Australia and South Africa and are central to accounts by explorers such as Meriwether Lewis and William Clark and surveyors from the Public Land Survey System. Scientific attention has been advanced by institutions including the Smithsonian Institution, the Nature Conservancy, and university programs at University of Wisconsin–Madison and University of Minnesota.
Oak savannas combine structural elements of temperate grasslands and open woodlands with dominant taxa in the genus Quercus such as Quercus alba, Quercus rubra, Quercus velutina and Quercus macrocarpa. The understory typically supports species cataloged in regional floras collected by botanists like Carl Linnaeus and Asa Gray, and noted in works published by the Botanical Society of America and the Royal Society. Soil profiles are often mapped in surveys by the Natural Resources Conservation Service and have been linked to glacial history reported by the United States Geological Survey and paleoecologists from Yale University.
Biodiversity in oak savannas includes assemblages studied by ecologists at the Ecological Society of America, with records of fauna such as Bison bison historically, and contemporary populations of Odocoileus virginianus, Cervus canadensis in some regions, and arthropods cataloged by the Entomological Society of America. Plant communities include prairie grasses referenced in floras by Gray's Manual and forbs documented in guides from the Missouri Botanical Garden, supporting pollinators recorded by researchers at the Xerces Society and bird assemblages monitored by the Audubon Society, Cornell Lab of Ornithology, and British Trust for Ornithology in different continents. Fungal partners and mycorrhizae have been the subject of studies at institutions such as the Royal Botanic Gardens, Kew and New York Botanical Garden.
Fire is a keystone process highlighted in policy and science reports by agencies including the United States Forest Service, National Park Service, and Parks Canada. Prescribed burning protocols developed with guidance from the Society for Ecological Restoration, the International Association of Wildland Fire, and university extension services at Iowa State University and Oregon State University inform management to maintain open canopy and control woody encroachment described in case studies from Badlands National Park and the Tallgrass Prairie National Preserve. Fire history reconstructions using dendrochronology and charcoal analysis have been coordinated by researchers at University of Arizona and the Smithsonian Tropical Research Institute.
Historical extents were mapped during expeditions and surveys involving the Lewis and Clark Expedition, United States Public Land Surveyors, and land-use records in the Homestead Acts era; landscape changes were driven by agricultural policy debates in the United States Congress and colonial land practices by entities such as the Hudson's Bay Company. Indigenous stewardship by nations including the Ojibwe, Dakota, Potawatomi, and Ho-Chunk Nation used fire as described in oral histories archived by the National Congress of American Indians and anthropologists at University of Chicago and Harvard University. European settlement patterns and industrial-era logging analyzed in studies from the Forest History Society transformed savanna extent noted in census and cartography by the Library of Congress.
Restoration techniques promoted by the Nature Conservancy, the Sierra Club, and the World Wildlife Fund employ assisted regeneration, invasive species control, and controlled burns following protocols from the Society for Ecological Restoration and extension programs at Michigan State University. Conservation initiatives involve partnerships with land trusts such as The Conservation Fund and municipal programs coordinated with agencies like Minnesota Department of Natural Resources and Illinois Department of Natural Resources. Funding and policy instruments referenced in initiatives from the National Fish and Wildlife Foundation and grants from the National Science Foundation support monitoring by networks including the Long-Term Ecological Research Network.
Specific variants include the Blackland Prairie-adjacent savannas of Texas noted in state natural heritage inventories, the Oak Openings region near Toledo, Ohio recorded by the Ohio Department of Natural Resources, the Central Hardwood Forest-bordering savannas of Missouri documented by the Missouri Department of Conservation, and European analogues such as the dehesa of Spain and montado of Portugal studied by the European Environment Agency. Australian eucalypt-dominated savannas with oak-analogues have been surveyed by the Commonwealth Scientific and Industrial Research Organisation and compared in transcontinental syntheses by the International Union for Conservation of Nature.
Contemporary threats assessed by bodies like the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services and the United Nations Environment Programme include land conversion driven by agricultural expansion tracked in reports by the Food and Agriculture Organization, woody encroachment documented by researchers at Stanford University and University of California, Berkeley, altered fire regimes analyzed by the U.S. Geological Survey, and invasive species listed by the European and Mediterranean Plant Protection Organization and national lists such as those maintained by the United States Department of Agriculture. Climate impacts projected in models from the Intergovernmental Panel on Climate Change and regional vulnerability assessments published by state agencies challenge restoration targets set by conservation NGOs including Conservation International and the World Resources Institute.