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11-Microbiology_Water_Mar12

Aerobic and facultave organisms oxidize organic maper

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Unformatted text preview: lake (nutrient rich) •  BoPom sediments are anaerobic and contain organic maPer (dead primary producers, etc.) which support the growth of denitrifiers, methanogens and sulfate reducers (H2S). •  Anaerobic photosynthesis uses H2S as electron donor and produces sulfate, which is used by sulfate reducers. •  Excessive produc<on of H2S and the produc<on of organic acids from fermenta<on can give the water a bad odor. The lack of oxygen and/or presence of H2S may kill fish and other aerobic organisms. 17 Lakes in temperate climates •  Anaerobic zones may develop as a result of summer stra<fica<on. Lakes become thermally stra<fied. •  As the air temperature increases, the surface water is warmed resul<ng in the forma<on of a warm upper layer – epilimnion – less dense, aerobic. •  The colder, boPom layer – hypolimnion, denser, anaerobic – is separated from the epilimnion by a zone of rapid temp. change – thermocline. •  Mixi...
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