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- W95003823 abstract "Dystrophic waters are characterized by high concentrations of colored dissolved organic matter originating from the watershed. The colored substances (humic and fulvic acids) attenuate light in the water column, thereby limiting the depth distribution of photosynthesis in the water column as well as in the littoral zone. Early limnologists perceived this primarily as a severe constraint on the overall productivity of lakes rich in humic substances, and hence coined the term ‘dystrophy,’ suggesting defective nourishment. Later research has shown that the dissolved organic matter from the watershed is a substantial subsidy to lake biota, especially via its utilization by heterotrophic bacteria. Additional important features of the humic matter are binding of metals and organic compounds (affecting their bioavailability), natural acidity, and buffering of more severe anthropogenic acidification. Also degradation by solar UV radiation produces organic compounds that are more easily available to heterotrophic bacteria than humic matter is. Dissolved organic matter from watersheds results in more in-lake mineralization than primary production of organic matter, and hence net heterotrophic conditions. Accordingly, the water of dystrophic lakes is strongly supersaturated with carbon dioxide, giving rise to a net flux to the atmosphere. According to current and emerging views of lake ecosystems, important traits originally attributed primarily to dystrophic lakes, i.e., net heterotrophy and terrestrial subsidy of the food web, are common among aquatic ecosystems, but are especially pronounced in dystrophic lakes." @default.
- W95003823 created "2016-06-24" @default.
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- W95003823 date "2014-01-01" @default.
- W95003823 modified "2023-10-15" @default.
- W95003823 title "Dystrophy in Freshwater Systems☆" @default.
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- W95003823 doi "https://doi.org/10.1016/b978-0-12-409548-9.09396-9" @default.
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