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13 Cards in this Set
- Front
- Back
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principle of allocation
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the concept that each organism has an energy budget, or a limited amount of total energy available for all of its maintenance and reproductive needs
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regulator
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A characterization of an animal in regard to a particular environmental variable, the animal is a regulator for that variable if it uses mechanisms of homeostasis to moderate internal change in the face of external fluctuation
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releaser
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A signal stimulus that functions as a communication signal between individuals of the same species
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conformer
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A characterization of an animal in regard to environmental variables, the animal is a conformer if it allows some conditions within its body to vary with certain external changes
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competitive exclusion principle
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The concept that when populations of two similar species compete for the same limited resources, one population will use the resources more efficiently and have a reproductive advantage that will eventually lead to the elimination of the other population
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commensalism
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A symbiotic relationship in which the symbiont benefits but the host is neither helped nor harmed
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circadian rhythm
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A physiological cycle of about 24 hours that is present in all eukaryotic organisms and that persists even in the absence of external cues
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phytoplankton
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Algae and photosynthetic bacteria that drift passively in the pelagic zone of an aquatic environment
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parasitism
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A symbiotic relationship in which the symbiont (parasite) benefits at the expense of the host by living either within the host (as an endoparasite) or outside the host (as an ectoparasite).
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predation
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An interaction between species in which one species, the predator, eats the other, the prey
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primary succession
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A type of ecological succession that occurs in a virtually lifeless area, where there were originally no organisms and where soil has not yet formed
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primary production
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The amount of light energy converted to chemical energy (organic compounds) by autotrophs in an ecosystem during a given time period
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interspecific competition
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Competition for resources between plants, between animals, or between decomposers when resources are in short supply
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