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Eco Evo Exam 4(c.20)

Definitions

TermDefinition
Primary productivity The rate at which solar or chemical energy is captured and converted into chemical bonds by photosynthesis or chemosynthesis.
Standing crop The biomass of producers present in a given area of an ecosystem at a particular moment in time.
Gross primary productivity (GPP) The rate at which energy is captured and assimilated by producers in an area.
Net primary productivity (NPP) The rate of energy that is assimilated by producers and converted into producer biomass in an area.
Remote sensing A technique that allows measurement of conditions on Earth from a distant location, typically using satellites or airplanes that take photographs of large areas of the globe.
Egested energy The portion of consumed energy that is excreted or regurgitated.
Assimilated energy The portion of energy that a consumer digests and absorbs.
Respired energy The portion of assimilated energy a consumer uses for respiration.
Net secondary productivity The rate of consumer biomass accumulation in a given area.
Trophic pyramid A chart composed of stacked rectangles representing the amount of energy or biomass in each trophic group.
Pyramid of energy A trophic pyramid that displays the total energy existing at each trophic level.
Pyramid of biomass A trophic pyramid that represents the standing crop of organisms present in different trophic groups.
Consumption efficiency The percentage of energy or biomass in a trophic level that is consumed by the next higher trophic level.
Assimilation efficiency The percentage of consumed energy that is assimilated.
Net production efficiency The percentage of assimilated energy that is used for growth and reproduction.
Ecological efficiency The percentage of net production from one trophic level compared tot he next lower trophic level. Also known as Food chain efficiency.
Energy residence time The length of time that energy spends in a given trophic level.
Biomass residence time The length of time that biomass spends in a given trophic level.
Ecological stoichiometry The study of the balance of nutrients in ecological interactions, such as between an herbivore and a plant.
Created by: BriawnaW