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Principles of Ecology - Principles of Ecology How...

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    Principles of Ecology:      How  Ecosystems work Principles of Environmental Management Lecture 5
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    Objectives biospheres, biomes, ecosystems abiotic and biotic factors  “range of tolerance” “zones of physiological stress” “zones of intolerance” Habitats and niches Competitive exclusion principle Trophic levels Biomass, energy and numbers in ecosystems Carbon and nitrogen cycles Characteristics of and threats to major biomes Human dependence on natural systems
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    Humans and Nature: The Vital  Connections Humans are a part of nature dependent on natural systems for a variety of  resources and ecological services Soil Air Water Sun Nutrient Cycles Other living organisms
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    Ecology: The Study of Natural  Systems Ecology describes relationships among  organisms and the environment Web of relationships and interactions The environment refers to our surroundings Broader term -not completely synonymous with  ecology
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    The Structure of Natural Systems Ecology focuses on interactions among the  components of biological systems All organisms consist of components  derived from the air, water and land
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    The Structure of Natural Systems The Biosphere An enormous biological system, spanning the  planet Life supporting portion of the earth Closed system that recycles materials over  and over to sustain life The sun’s energy is the only outside contribution Humans break these cycles at great risk
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    The Structure of Natural Systems The biosphere consists of distinct regions: Biomes Aquatic life zones
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    Terrestrial areas with distinctive chemical  and physical conditions and unique  collection of organisms Climate Soils Plants and animals Precipitation temperature Climate, soil type, geomorphology determine  what can live there Controlling factors Biomes
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    Fig. 4-2 Biomes
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