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Lect_15_Hypolim - Lecture 15 Trouble down below the...

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Lecture 15: Trouble down below; the hypolimnion strikes back Decomposition processes Methane Nitrogen Redox, iron and phosphorus Internal loading
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(Particulate organic matter) Inorganic nutrients
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Microbial oxidation of organic matter Source material (POM, DOM): Complex proteins, lipids, polysaccharides, other polymers Simpler products, e.g. monosaccharides, amino acids, fatty acids, nucleotides CO 2 , H 2 O Electron-accepting stage CO , N CO 2 , S 2 CO 2 , CH 4 hydrolysis Aerobic respiration Anaerobic fermentation Denitrification (facultative anaerobes) sulfate reduction methane production Strict anaerobes Aerobes and facultative anaerobes NO SO 4 2- C-C, CO 2
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Methane production Increasing in atmosphere at about 1% per annum Northern wetlands (including lakes and rivers) and rice paddies are the biggest sources (ruminants significant but much less) Methane production may account for half of all the organic matter consumed under anaerobic conditions (hypolimnion, sediments)
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H Methane derives from methyl carbon of acetate (CH 3 COOH) Or by reduction of CO 2 , using H derived from organic acids
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Methanogens and sulfate reducers duke it out….
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