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15 terms

APES Chapter 9 Key Terms

STUDY
PLAY
Biological production
the capture of Usable energy from the environment to produce organic compounds in which that energy is stored
Biomass
Total amount of organic Matter on earth or in any ecosystem or area
Autotrophs
Self nourishing
Primary production
Production by autotrophs
Photosynthesis
Producing sugar from sunlight, carbon dioxide, and water
Chemoautotrophs
Organism deriving energy from inorganic sulfur compounds
Heterotrophs
Organisms that must feed on other living things
Secondary production
Production by heterotrophs
Respiration
the metabolic processes whereby certain organisms obtain energy from organic molecules
Gross production
Product of organic matter before use
Net production
gross production - respiration
Ecosystem energy flow
movement of energy through an ecosystem from the external environment through a series of organisms and back to external environment.
Thermodynamic system
Energy source and energy sink combined.
Tropic-level efficiency
Ratio of production of one tropic level to the production of the next tropic level
Entropy
(communication theory) a numerical measure of the uncertainty of an outcome