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Alvar: Map

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This article is about the landform. For the Tamil saints, see Alvars; for the village in Armenia, see Alvar, Armeniamarker.


An alvar or pavement barren is a biological environment based on a limestone plain with thin or no soil and, as a result, sparse vegetation. In the United Kingdommarker this landform is called a limestone pavement. This challenging 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. Alvars can be found in southern Swedenmarker, northwest Estoniamarker and around the Great Lakesmarker in Michiganmarker, New Yorkmarker and Ohiomarker in the United Statesmarker and in Ontariomarker and Quebecmarker in Canadamarker. Alvars comprise a small percentage of the Earth's ecosystems by land extent; although, some 120 exist in the Great Lakes region, they comprise only 0.2% of the land area there.

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 northern bog violet, balsam squaw-weed, Kalm's lobelia, 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 Ölandmarker. Here the thin soil mantle is only .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 UNESCOmarker World heritage site.

European alvar locations



North American alvar locations



See also



References

  1. C.M. Hogan, The Stora Alvaret on Öland, Lumina Technologies, Santa Rosa, Ca. July 21, 2006
  2. The countryside of eastern Smaland, ed. by Markus Forslund, Kalmarsund, Tryck (1999) ISBN 91-630-7610-1


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