Prokaryotes fungi and bacteria serve role as

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Unformatted text preview: esnut was brought and killed all the chesnut tress – seven species of moss and butterflies became extinct) 17. Keystone species are not necessarily abundant in community but exert strong control on community by their ecological roles; “key” species 18. Foundation species cause physical changes in environment; sometimes called facilitators if they have positive effects on the survival and reproduction of other species in the community Chapter 55: Ecosystems 1. E cosystem - all the organisms living in a community and the abiotic factors with which they interact E nergy flow - sunlight—autotrophs—heterotrophs—heat C hemical cycling - elements such as carbon and nitrogen are cycled among abiotic and biotic components of ecosystem T rophic level - species assignment based on main source of nutrition and energy B iogeochemical cycle (BGCs) - biological and geochemical processes move nutrients between organic and inorganic parts of the ecosystem 2. Ecosystems are transformers of energy and processors of matter 3. Primary (1°) producer- autotrophs that support all other organisms in the ecosystem Primary consumer- consumes primary producer (usually herbivores) Secondary (2°) consumer- eat herbivores (carnivores) Tertiary consumer- carnivore eats carnivore Detritivores- decomposers; energy from nonliving material 4. Prokaryotes, fungi, and bacteria serve role as decomposers; they are major link between primary producers and consumers in an ecosystem 5. Primary production is the amount of light energy converted to chemical energy by autotrophs during a given time period. 1% photosynthesis. is converted to chemical energy by 6. How do NPP and GPP differ? Gross Primary Production (GPP) is the amount of light energy converted to chemical energy by photosynthesis per unit of time. Net Primary Production (NPP) is the amount of chemical energy available to consumers. NPP = GPP – energy used by primary producers for respiration (R) 7. NPP can be expressed in J/m2/yr or...
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This document was uploaded on 03/02/2014 for the course BIO 109 at University of Missouri-Kansas City .

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