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13 Cards in this Set

  • Front
  • Back
principle of allocation
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
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
A signal stimulus that functions as a communication signal between individuals of the same species
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
competitive exclusion principle
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
A symbiotic relationship in which the symbiont benefits but the host is neither helped nor harmed
circadian rhythm
A physiological cycle of about 24 hours that is present in all eukaryotic organisms and that persists even in the absence of external cues
Algae and photosynthetic bacteria that drift passively in the pelagic zone of an aquatic environment
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).
An interaction between species in which one species, the predator, eats the other, the prey
primary succession
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
primary production
The amount of light energy converted to chemical energy (organic compounds) by autotrophs in an ecosystem during a given time period
interspecific competition
Competition for resources between plants, between animals, or between decomposers when resources are in short supply