Lake meromictic

A lake meromictic is a lake where the depth and surface water mixes less once per annum and for some less once per decade or century.

This generally occurs for the deep and not very wide, sheltered lakes wind generally between rock faces or for the lakes whose deep water is strongly salted and denser than surface water.

It thus is different from a lake holomictic where water mixes at least once per annum and that one can divide into monomictic if the mixture occurs once, dimictic if it occurs twice, polymictic if it occurs several times.

These lakes have the characteristic to have, in their deep water, of very weak concentrations out of oxygen (lower than 1 mg/l) and

not to be able to allow the development of living organisms other than sulfurous bacteria
not to allow the oxidation and the decomposition of the organic matters

and consequently by taking away made to study the layers of sediments, to allow to know the various vegetations and climates, fires, etc which the area knew.

They on the other hand have the disadvantage of accumulating dissolved carbonic gas which can be released in great quantity at the time of an earthquake or a landslide, gas which while being spread brutally with the short-nap cloth of the ground in the surrounding atmosphere can be responsible for dead men or animals (it was the case with the lake Nyos in 1986 when it nearly 1800 had died there)

This term was created by the Zoologiste G. Evelyn Hutchinson in 1957 in son" Treatise one Limnology".

Various lakes meromictic

North America

Lake Soap in the state of Washington.
and, in the park, to 13 km in the East of Syracuse (New York) in the state of New York
Lake Ballston, to 30 km with the north-north-west of Albany, in the state of New York
Lake Crawford close to Milton, in Ontario
Lake Pink in the park of the Gatineau, with the Quebec
Lake McGinnis in the provincial park Petroglyphs, in the Ontario
Lake Mahoney in the valley Okanagan, in British Columbia
bay Irondequoit (Rochester, state of New York) is also regarded as meromictic. The use of salt on the roads is regarded as the leading cause of this situation.

Australia and New Zealand

Lake Fidler, upstream of the river Gordon in Tasmanie, Australia

Europe

Lakes Salsvatnet, Kilevann, Tronstadvatn, Birkelandsvatn, Rørholtfjorden, Botnvatn, Rørhopvatn and Strandvatn in Norway
Lake Pavin (Puy-de-Dôme) in France, of the doubts also exists for the Lakes Chauvet (Puy-de-Dôme, France) and of Godivelle of In Top (Puy-de-Dôme, France) like for the Gour de Tazenat (Puy-de-Dôme, France)

Africa

Lake Nyos with the Cameroun

Asia

Lake Pantai Keracut (Keracut Beach), National park of Penang, in the North-West of the island Penang, in Malaysia
the Black Sea

Appendices

Sources

Wetzel, Robert G. (2001). Limnology: Lake and To rivet Ecosystems (Third Edition) (Academic Near, New York). ISBN-13: 978-0127447605.
Hutchinson, G. Evelyn (1957). In Treatise one Limnology. Volume I: Geography, Physics and Chemistry, (Wiley, New York). ISBN-13: 9780471425700
Lampert, Winfried and To summon, Ulrich (1997). Limnoecology: The Ecology off Lakes and Streams (Oxford University Near, Oxford). Translation by James F. Haney. ISBN-13: 978-0195095920.

External bonds

Lake Fidler revived
the lake Pink

Random links: