Chapter 24 (1)

Chapter 24 (1) - Chapter 24 Environmental Microbiology...

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Chapter 24 Environmental Microbiology Study of the relationship of microorganisms with one another and with their environment Microorganisms are affected by biotic and abiotic factors Biotic factors – living or dead organism surrounding the microorganism Abiotic factors – nonliving components (chemicals – minerals, temperature, pH, light) The Organization of Ecosystem Planet Earth Lithosphere Hydrosphere Atmosphere Biosphere Ecosystem A natural unit consisting of all living organism in an area functioning together with all of the non-living factors of the environment Community Clustered association of different organisms living at the same place Population Group of individual organisms of the same kind A food chain or energy pyramid is organized in three categories: Producers Consumers Decomposers The Role of Microorganisms in Ecosystem Primary producers Photosynthetic organisms: Algae, photosynthetic bacteria Consumers Protozoa that feed on algae and bacteria Decomposers Heterotrophic bacteria and fungi that degrade dead plant and animal material Parasites Living and feeding on a host (viruses, bacteria, fungi, protozoa) Interactions Between Organisms Mutualism Biological interaction between individuals where both organisms derive a benefit Example: Lichens Commensalism Relationship between two organisms where one benefits and the other is not affected
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Example: Bacteria living on the surface of algae Co-metabolism The waste product of one microbe is a nutrient for the other Parasitism A relationship in which the parasite benefits from a close association with the
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Chapter 24 (1) - Chapter 24 Environmental Microbiology...

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