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Titolo:
The meromictic alpine Lake Cadagno: Orographical and biogeochemical description
Autore:
Del Don, C; Hanselmann, KW; Peduzzi, R; Bachofen, R;
Indirizzi:
Univ Zurich, Inst Plant Biol, CH-8008 Zurich, Switzerland Univ Zurich Zurich Switzerland CH-8008 Biol, CH-8008 Zurich, Switzerland Ist Cantonale Batteriosierol, CH-6900 Lugano, Switzerland Ist Cantonale Batteriosierol Lugano Switzerland CH-6900 ano, Switzerland
Titolo Testata:
AQUATIC SCIENCES
fascicolo: 1, volume: 63, anno: 2001,
pagine: 70 - 90
SICI:
1015-1621(2001)63:1<70:TMALCO>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
IN-SITU ANALYSIS; SWITZERLAND; CHEMOCLINE; BACTERIA; SULFIDE; SULFUR; ENVIRONMENT; SEDIMENTS;
Keywords:
morphometry; geology; water chemistry; water density; diurnal and seasonal changes; light regime;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Bachofen, R Univ Zurich, Inst Plant Biol, Zollikerstr 107, CH-8008 Zurich,Switzerland Univ Zurich Zollikerstr 107 Zurich Switzerland CH-8008 erland
Citazione:
C. Del Don et al., "The meromictic alpine Lake Cadagno: Orographical and biogeochemical description", AQUAT SCI, 63(1), 2001, pp. 70-90

Abstract

Lake Cadagno is a 21 m deep alpine meromictic lake situated at an altitudeof 1921 m in the Piora valley in the southern part of central Switzerland. The bedrock of the valley containing dolomite and gypsum determines the chemistry of the water. The lake basin was created by glacial erosion and originally dammed by a glacial moraine. The water body is structured in 3 distinct layers, the oxic mixolimnion, the anoxic monimolimnion and a narrow chemocline in between. The water masses of the lake are stabilized by densitydifferences of salt-rich water which is constantly supplied by subaquatic springs to the monimolimnion. In contrast the mixolimnion is fed by electrolyte-poor surface water. Sulfate, hydrogen carbonate, calcium and magnesiumare the dominant ionic species. In the monimolimnion sulfide concentrations of more than 1 mM are found. The chemocline at a depth of 10 to 13 m is characterized by steep chemical and physical gradients. It contains dense populations of up to 10(5) cells/mL of phototrophic sulfur bacteria consisting of predominantly Chromatium okenii, C. minus and Amoebobacter purpureus. The lake has proven to be an excellent model system for studies of the roleof planktonic bacteria which dominate the sulfur cycle.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 12:56:04