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  • acidification  (2)
  • Key words: Alpine lake, Arctic char, soft water, hypercapnia, gill epithelia, chloride cells.  (1)
  • dust deposition  (1)
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  • 1
    ISSN: 1420-9055
    Keywords: Key words: Alpine lake, Arctic char, soft water, hypercapnia, gill epithelia, chloride cells.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract: The gill structure of Arctic char from a low ionic (1-2 μmol Cl-) high mountain lake (2344 m above sea level) showed distinct seasonal changes. From spring to early winter chloride cells (responsible for ion uptake) were numerous, and during summer gill epithelia were highly hypertrophic resulting in a thick blood-to-water barrier. This gill morphology is typical for fish from soft water habitats and reflects osmoregulatory responses. In mid-winter, however, both chloride cell numbers and epithelia thickness were reduced and comparable to the situation in freshwater with high ionic contents. This pattern correlated with seasonal fluctuations of water chemistry. The most significant correlation was found with CO2 which accumulated under the ice cover, reaching a tenfold oversatturation. The concentration of Ca, Na, and Cl varied only by a factor of two or less and the correlation with the epithelial thickness was much weaker.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5117
    Keywords: sediment ; chemical stratigraphy ; high altitude lakes ; eutrophication ; acidification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chemical sediment stratigraphy of four high alpine lakes is discussed with respect to atmogenic eutrophication as well as acidification. All lakes show more or less clearly paleoindications of atmospheric, anthropogenic impacts, mainly as slight eutrophication (Schwarzsee and Upper Plenderlesee, Tyrolia, and Gippersee, Carinthia). In Schwarzsee and Goaßelesee (Carinthia), there are weak but not yet significant indications of slight lake acidification, additionally.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Water, air & soil pollution 112 (1999), S. 217-227 
    ISSN: 1573-2932
    Keywords: acidification ; dust deposition ; high mountain lakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract For a long time studies on precipitation and lake-water chemistry have focussed on the deposition of strong acids. Dust in snow and rain was analyzed much less intensively, but recent findings suggest that it may be the missing link which explains why many low-alkalinity lakes in the Alps and the Pyrenees did not become acidic and nutrient levels are seasonally high, whereas lakes in areas which are rarely influenced by dust depositions, for instance in Scandinavia, have acidified. Beside being a dominant factor for nutrient inputs to oceans, rain forests and remote lakes, dust can also play a major role in global warming and cooling, and it may significantly contribute to soil formation at mountain sites in the Mediterranean. I suggest that future changes in dust deposition and warming will be key factors for the development of alpine lakes.
    Type of Medium: Electronic Resource
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