Bio 100 Lecture 4 Ecology I.ppt - ECOLOGY I Ecology the study of how organisms interact with one another and with their non-living environment

Bio 100 Lecture 4 Ecology I.ppt - ECOLOGY I Ecology the...

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ECOLOGY I ECOLOGY I
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Ecology : the study of how organisms interact with one another and with their non-living environment.
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Organism: is any form of life. A living thing. Species: Group of similar organisms that can mate with one another and not with other organisms. Population: group of interacting individuals of the same species occupying a specific area. Example all the sunfish in a pond. Definitions
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Niche: the way in which an organism utilizes the resources of its environment. The role played by a particular species in its environment. An organism’s “job.” Habitat: Place where a population or individual normally lives. An organism’s “address.” Definitions
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Definitions Community: All the organisms that live in a similar environment. All the populations of different species living and interacting in an area. Ecosystem: A community of different species interacting with one another and with the physical environment. Biosphere: all the Earth’s ecosystems together
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Levels of Organization Addressed by Ecology Organism Population Community the Biosphere All regions of the Earth’s waters, crust, and atmosphere that hold organisms. A community that is interacting with its physical environment. All populations of all species occupying a specified area. Group of single-celled or multicelled individuals of the same species occupying a specified area. Individual made of one or more cells. Ecosystem
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Ecosystems Consist of two components: 1. Abiotic: Nonliving components. Examples: water, air, soil, nutrients, light, topography, climate, etc. 2. Biotic: Living components. Examples: plants, animals, fungi and microbes. Further classified by role: producer, consumer or decomposer.
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A Simple Model of the Earth System – The Four Great Spheres Lithosphere - All processes associated with the solid earth Hydrosphere - All processes associated with water Atmosphere - All processes associated with the gases that envelope the earth Biosphere - All processes that involve living organisms Abiotic Biotic
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