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| An organism that produces its own food from inorganic compounds and a source of energy. | ||
| The capture of usable energy from the environment to produce organic compounds in which that energy is stored. | ||
| The amount of living material, or the amount of organic material contained in living organisms, both as live and dead material | ||
| Autotrophic bacteria that can derive energy from chemical reactions of simple inorganic compounds | ||
| The flow of energy through an ecosystem -- from the external environment through a series of organisms and back to the external environment | ||
| A measure in a system of the amount of energy that is unavailable for useful work. It increases as disorder of a system increases. | ||
| Production before respiration losses are subtracted | ||
| Organisms that cannot make their own food from inorganic chemicals and a source of energy and therefore live by feeding on other organisms | ||
| The production that remains after utilization. It is also measured as the net change in biomass or in stored energy | ||
| Synthesis of sugars from carbon dioxide and water by living organisms using light as energy. Oxygen is given off as a by-product | ||
| The production by autotrophs | ||
| The complex series of chemical reactions in organisms that make energy available for use | ||
| The production by heterotrophs | ||
| Formed by an energy source, ecosystem, and energy sink, where the ecosystem is said to be an intermediate system between the energy source and the energy sink | ||
| The ratio of the biological production of one trophic level to the biological production of the next lower trophic level |
