Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Alvar> ?p ?o }
- Alvar abstract "This article is about the landform. For the Tamil saints, see Alvars; for the village in Armenia, see Alvar, Armenia; for the villages in Iran, see Alvar, Iran; for the architect see Alvar Aalto.An alvar is a biological environment based on a limestone plain with thin or no soil and, as a result, sparse grassland vegetation. Often flooded in the spring, and affected by drought in midsummer, alvars support a distinctive group of prairie-like plants. Most alvars occur either in northern Europe or around the Great Lakes in North America. This stressed habitat supports a community of rare plants and animals, including species more commonly found on prairie grasslands. Lichen and mosses are common species. Trees and bushes are absent or severely stunted. The primary cause of alvars is the shallow exposed bedrock. Flooding and drought, as noted, add to the stress of the site and prevent many species from growing. Disturbance may also play a role. In Europe, grazing is frequent, while in North America, there is some evidence that fire may also prevent encroachment by forest. The habitat also has strong competition gradients, with better competitors occupying the deeper soil and excluding other species to less productive locations. Crevices in the limestone provide a distinctive habitat which is somewhat protected from grazing, and which may provide habitat for unusual ferns such as Pellaea atropurpurea. Bare rock flats provide areas with extremely low competition that serve as refugia for weak competitors such as Minuartia michauxii and Micranthes virginiensis. In a representative set of four Ontario alvars, seven habitat types were described. From deep to shallow soil these were: tall grassy meadows, tall forb-rich meadows, low grassy meadows, low forb-rich meadows, dry grassland, rock margin grassland and bare rock flats.Alvars comprise a small percentage of the Earth's ecosystems by land extent. Although some 120 exist in the Great Lakes region, in total there are only about 112 square kilometres (43 sq mi) left across the entire Great Lakes basin, and many of these have been degraded by agriculture and other human uses. More than half of all remaining alvars occur in Ontario. There are smaller areas in New York, Michigan, Ohio, Wisconsin and Quebec.In North America, alvars provide habitat for birds such as bobolinks, eastern meadowlarks, upland sandpipers, eastern towhees, brown thrashers and loggerhead shrikes whose habitat is declining elsewhere. Rare plants include Kalm's lobelia (Lobelia kalmii), Pringle's aster, juniper sedge (Carex juniperorum), lakeside daisy (Hymenoxys acaulis), ram's-head lady's-slipper (Cypripedium arietinum) and dwarf lake iris (Iris lacustris). Also associated with alvars are rare butterflies and snails.The use of the word \"alvar\" to refer to this type of environment originated in Scandinavia. The largest alvar in Europe is located on the Swedish island of Öland. Here the thin soil mantle is only 0.5 to 2.0 centimeters thick in most places and in many extents consists of exposed limestone slabs. The landscape there has been designated a UNESCO World Heritage Site. There are other more local names for similar landforms, such as a pavement barren although this term is also used for similar landforms based on sandstone. In the United Kingdom the exposed landform is called a limestone pavement and thinly covered limestone is known as calcareous grassland.".
- Alvar thumbnail Österplana_hed.jpg?width=300.
- Alvar wikiPageExternalLink index.asp?SNA=332.
- Alvar wikiPageExternalLink story.html?id=fa6a428a-57da-45bd-8294-1fffa571f628.
- Alvar wikiPageExternalLink cameronranch.htm.
- Alvar wikiPageExternalLink alvars.
- Alvar wikiPageExternalLink 0,4570,7-153-31154_31260-54020--,00.html.
- Alvar wikiPageExternalLink about.htm.
- Alvar wikiPageExternalLink oct19nr99.html.
- Alvar wikiPageExternalLink art11823.html.
- Alvar wikiPageExternalLink alvar.htm.
- Alvar wikiPageExternalLink res_baptist.html.
- Alvar wikiPageExternalLink res_bruce_alvar.html.
- Alvar wikiPageExternalLink res_quarry.html.
- Alvar wikiPageExternalLink res_stone_road_alvar.html.
- Alvar wikiPageExternalLink indi.html.
- Alvar wikiPageExternalLink trails.
- Alvar wikiPageID "336820".
- Alvar wikiPageID "40329464".
- Alvar wikiPageLength "11744".
- Alvar wikiPageLength "31".
- Alvar wikiPageOutDegree "1".
- Alvar wikiPageOutDegree "102".
- Alvar wikiPageRedirects Aliabad,_Khalkhal.
- Alvar wikiPageRevisionID "569814867".
- Alvar wikiPageRevisionID "708226337".
- Alvar wikiPageWikiLink Aliabad,_Khalkhal.
- Alvar wikiPageWikiLink Alvar,_Armenia.
- Alvar wikiPageWikiLink Alvar,_Iran.
- Alvar wikiPageWikiLink Alvar_Aalto.
- Alvar wikiPageWikiLink Alvars.
- Alvar wikiPageWikiLink Aylmer.
- Alvar wikiPageWikiLink Balsam_Lake_(Ontario).
- Alvar wikiPageWikiLink Baltic_Klint.
- Alvar wikiPageWikiLink Biodiversity_action_plan.
- Alvar wikiPageWikiLink Bobolink.
- Alvar wikiPageWikiLink Brown_thrasher.
- Alvar wikiPageWikiLink Bruce_Peninsula.
- Alvar wikiPageWikiLink Bryophyte.
- Alvar wikiPageWikiLink Burnt_Lands_alvar.
- Alvar wikiPageWikiLink Butterfly.
- Alvar wikiPageWikiLink Calcareous_grassland.
- Alvar wikiPageWikiLink Category:Alkaline_soils.
- Alvar wikiPageWikiLink Category:Alpine_flora.
- Alvar wikiPageWikiLink Category:Geography_of_Gotland_County.
- Alvar wikiPageWikiLink Category:Gotland.
- Alvar wikiPageWikiLink Category:Habitats.
- Alvar wikiPageWikiLink Category:Landforms.
- Alvar wikiPageWikiLink Category:Types_of_soil.
- Alvar wikiPageWikiLink County_Clare.
- Alvar wikiPageWikiLink Cumbria.
- Alvar wikiPageWikiLink Cypripedium_arietinum.
- Alvar wikiPageWikiLink Drummond_Township,_Michigan.
- Alvar wikiPageWikiLink Eastern_meadowlark.
- Alvar wikiPageWikiLink Eastern_towhee.
- Alvar wikiPageWikiLink Ecosystem.
- Alvar wikiPageWikiLink England.
- Alvar wikiPageWikiLink Estonia.
- Alvar wikiPageWikiLink Falbygden.
- Alvar wikiPageWikiLink Forb.
- Alvar wikiPageWikiLink Gotland.
- Alvar wikiPageWikiLink Government_of_Estonia.
- Alvar wikiPageWikiLink Grassland.
- Alvar wikiPageWikiLink Hectare.
- Alvar wikiPageWikiLink Ireland.
- Alvar wikiPageWikiLink Iris_lacustris.
- Alvar wikiPageWikiLink Kelleys_Island,_Ohio.
- Alvar wikiPageWikiLink Kinnekulle.
- Alvar wikiPageWikiLink Lake_Erie.
- Alvar wikiPageWikiLink Lake_Huron.
- Alvar wikiPageWikiLink Lake_Michigan.
- Alvar wikiPageWikiLink Lake_Ontario.
- Alvar wikiPageWikiLink Landform.
- Alvar wikiPageWikiLink Lichen.
- Alvar wikiPageWikiLink Limestone.
- Alvar wikiPageWikiLink Limestone_pavement.
- Alvar wikiPageWikiLink Lobelia_kalmii.
- Alvar wikiPageWikiLink Loggerhead_shrike.
- Alvar wikiPageWikiLink Loopealse.
- Alvar wikiPageWikiLink Manitoba.
- Alvar wikiPageWikiLink Manitoulin_Island.
- Alvar wikiPageWikiLink Marblehead,_Ohio.
- Alvar wikiPageWikiLink Michigan.
- Alvar wikiPageWikiLink Micranthes_virginiensis.
- Alvar wikiPageWikiLink Minuartia_michauxii.
- Alvar wikiPageWikiLink Moss.
- Alvar wikiPageWikiLink Natura_2000.
- Alvar wikiPageWikiLink North_America.
- Alvar wikiPageWikiLink Ohio.
- Alvar wikiPageWikiLink Ontario.
- Alvar wikiPageWikiLink Paldiski.
- Alvar wikiPageWikiLink Pelee,_Ontario.
- Alvar wikiPageWikiLink Pellaea_atropurpurea.
- Alvar wikiPageWikiLink Plain.
- Alvar wikiPageWikiLink Prairie.
- Alvar wikiPageWikiLink Quebec.
- Alvar wikiPageWikiLink Rapla_County.
- Alvar wikiPageWikiLink Rare_Charitable_Research_Reserve.
- Alvar wikiPageWikiLink Rare_species.
- Alvar wikiPageWikiLink Red_Banks,_Brown_County,_Wisconsin.