From Big Medical Encyclopedia

BIOGEOCHEMICAL PROVINCES — the sites of the territory of Earth, various in size, with various level of concentration (or a ratio) chemical elements which are characterized by appropriate level of their concentration in organisms and as a result — emergence of response biological responses from a human body, animals, plants and microorganisms.

Influence of different chemical elements on an organism, various on the specificity and depth, is especially strongly shown at sharply expressed surplus or a lack of certain chemical elements. Expressiveness of biological responses depends on degree of fitness of an organism to this concentration of a chemical element and is expressed by formation of new physiological and morphological variations, races or other taxonomical units, various forms of disbolism and developing of local diseases (biogeochemical endemiya) which can terminate in death of an organism. Similar are known to an endemia for strontium (chondrodystrophia), boron (boric enteritis), fluorine (fluorosis), calcium (fragility of bones), cobalt (hypo - and avitaminosis of B 12 ), iodine (a local craw), etc.

See also Biogeochemical division into districts , Geochemical ecology , Microelements .

Bibliography: Vinogradov A. P. Bio-geochemical provinces and endemia, Dokl. Academy of Sciences of the USSR, t. 18, No. 4-5, page 283, 1938; Kovalsky V. V. Regions of the biosphere — a basis of biogeochemical division into districts, in book: The biosphere and its resources, under the editorship of V. A. Kovda, page 90, M., 1971; Kovalsky V. V. Geochemical ecology, M., 1974.

V. V. Kovalsky.