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1MO3_Chapter 54.docx

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Jon Stone

Ecosystems Questions  In Figure 53.9, where do you see the highest species richness? o community 1 o community 2 o community 3 o community 4 o both community 2 and community 4 Key Concepts  An ecosystem has four components: o the abiotic environment o primary producers o consumers o decomposers  These components are linked by the movement of energy and nutrients.  availability is the key constraint in aquatic ecosystems. As energy flows from producers to consumers and decomposers, much of it is lost.  To analyze nutrient cycles, biologists focus on the nature of the reservoirs where elements reside and on how quickly elements move between reservoirs.  Humans are causing large, global changes in the abiotic environment. The burning of fossil fuels has led to rapid global warming. Extensive fertilization is increasing productivity and causing pollution. Introduction  An ecosystem consists of the multiple communities of organisms that live in an area and their chemical and physical (abiotic) environment.  This chapter focuses on changes in the chemical and physical characteristics of the environment. Energy Flow and Trophic Structure  Ecosystems have four components: o primary producers o consumers o decomposers o the abiotic environment  These components are linked by a flow of energy. Ecosystems  A primary producer, or autotroph, is an organism that can synthesize its own food from inorganic sources.  Primary producers form the basis of ecosystems by transforming the energy in sunlight or inorganic compounds into the chemical energy stored in
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