10-Microbiology_Soil_Feb28

Dierence in the type and quanaty of resources and the

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Unformatted text preview: microbial populaAons. Sets of guilds form microbial communiAes that interact with macroorganisms and abioAc factors in the ecosystem. •  Niche: Habitat shared by a guild. Supplies nutrients as well as condiAons for growth. •  Energy inputs: sunlight, organic carbon, reduced inorganic substances. 5 Brock Biology of Microorganisms, 13th EdiAon. Microenvironments •  The growth of microbes depends on resources and growth condiAons. •  Difference in the type and quanAty of resources and the physiochemical condiAons of a habitat define the niche for each microbe. •  For each organism there exists at least one niche in which that organism is most successful (prime niche). •  Microenvironment –  The immediate environmental surroundings of a microbial cell or group of cells –  Soil parAcles contain many microenvironments à༎ Oxygen concentraAon in a soil parAcle 6 Brock Biology of Microorganisms, 13th EdiAon. Microenvironments •  Physiochemical condiAons in a microenvironment are subject to rapid change, both spaAally and temporally. •  Resources in natural environments are highly variable and many microbes in nature face a feast- or- famine existence (storage is important). •  Growth rates of microbes in nature are usually well below maximum growth rates defined in the laboratory. •  CompeAAon and cooperaAon occur between microbes in natural systems and between microbes and higher organisms. •  Many microbes establish relaAonships with other organisms –  ParasiAsm: one member in th...
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This note was uploaded on 03/20/2014 for the course PSYC 101 taught by Professor Catone during the Spring '07 term at CSU Fullerton.

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