Lect_21 - UNIT IV: ECOLOGY Lecture 21: Ecology and Plant...

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Lecture 21: Ecology and Plant Succession Introduction to Ecology Populations, communities Ecosystems Biosphere The Greenhouse Effect Plant succession: Primary and secondary succession Human interference in plant succession UNIT IV: ECOLOGY
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Introduction to Ecology Ecology = from the Greek oikos (“house”) + logy (study) __________ is the study of the effects of the environment on living organisms, the effect of living organisms on the environment The effects of living organisms on each other _________ ecology : the interaction among plants, and between plants and the environment organisms organisms Environment Environment organisms organisms
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____________ deals with studies of organisms, populations, communities, ecosystems and the biosphere
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Population _____________ are all the members of a single species living together _________ – the location where the population is found (the “address” of an organism) ___________ – the functional role an organism plays in the ecosystem – it encompasses habitat plus relationships with other organisms in the ecosystem
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Plant Community Plant ____________________ – different populations of plants living together in the same geographical area ________________ species – the most influential species in the community; for example: Redwood forest They control structure and species composition of the community through ______________ factors Light (provide shade) Wind (wind screen) Humidity (higher than in open areas) Chemical factors nutrients pH
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Ecosystem E_____________ – is the functional unit of study in the environment; A community with all its living organisms (biotic) and non living organisms (abiotic) B________ – there are many organisms that live in a community; organisms interact in food chains: Producers 1 st order consumers 2 nd order consumers (photosynth.) (herbivores) (carnivores)
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Lect_21 - UNIT IV: ECOLOGY Lecture 21: Ecology and Plant...

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