ch 6 notes

ch 6 notes - ECOSYSTEMS AND ECOLOGICAL COMMUNITIES...

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ECOSYSTEMS AND ECOLOGICAL COMMUNITIES ecosystem - biological community and its physical environment the simplest entity that can sustain life consists of producers and decomposers and a fluid medium. poorly defined or indistinct :ecosystems exchange energy and materials, not independent Characteristics of ecosystems: structure: biotic –living - community abiotic - nonliving,( air, soil, water) processes: cycling of elements flow of energy. change over time - succession community – all organisms in ecosystem Populations - same species Species - individuals capable of interbreeding, producing fertile offspring ENERGY LEVELS Trophic - comes from Greek word for nourishment or food. Food chain - feeding relationships, who eats whom. Food web - all interconnected food chains Trophic levels - level in food chain where organism typically feeds
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ch 6 notes - ECOSYSTEMS AND ECOLOGICAL COMMUNITIES...

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