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microbial decomposiaon is the largest source of co2

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Unformatted text preview: e relaAonship is harmed and the other benefits. –  Mutualism: both species benefit (symbiosis). –  Commensalism: one species benefits and the other is neither harmed nor helped. 7 Biogeochemistry •  Biogeochemistry: the study of biologically mediated chemical transformaAons. •  A biogeochemical cycle defines the transformaAons of a key elements by biological and chemical agents. •  Typically proceed by oxidaAon–reducAon reacAons •  Microbes play criAcal roles in energy transformaAon and biogeochemical processes that result in the recycling of elements to living systems. –  Carbon cycle –  Nitrogen cycle –  Sulfur cycle 8 Carbon cycle •  •  •  •  CO2 in the atmosphere is the most rapidly transferred carbon reservoir. CO2 is fixed by photosyntheAc land plants and marine microbes. CO2 is returned to the atmosphere by respiraAon as well as anthropogenic acAviAes (the use of fossil fuel, etc.). Microbial decomposiAon is the largest source of CO2 released to the atmosphere. 9 Brock Biology of Microorganisms, 13th EdiAon. Carbon cycle •  Carbon and oxygen cycles are linked •  Phototrophic organisms are the foundaAon of the carbon cycle •  Photosynthesis (with Calvin cycle) CO2 + H2O à༎ (CH2O) + O2 •  RespiraAon (CH2O) + O2 à༎ CO2 + H2O •  The two major end products of decomposiAon are CH4 and CO2 10 Brock Biology of Microorganisms, 13th EdiAon. Nitrogen cycle •  N2 is the most stable for...
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