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19 Cards in this Set
- Front
- Back
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population density
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the number of individuals of a particular species per unit area or volume.
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exponential growth
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the population multiplies by a constant factor at constant time intervals
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limiting factor
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a condition that can restrict a population's growth
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carrying capacity
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the number of organisms in a population the the environment can maintain with no net increase or decrease
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density-dependent factor
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a factor that limits a population more as population density increases
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density-independent factor
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factors that limit population but are unrelated to a population density
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age structure
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the proportion of people in different age groups
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interspecific competition
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competition within species
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competitive exclusion
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one species succeeding over another when the growth of both species is limited by the same resource
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niche
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unique living arrangement of an organism defines by its habitat food sources time of day it is most active and other factors
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predication
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an interaction in which one organism eats another
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symbiotic relationship
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a close interaction between species in which one of the species lives in or on the other
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parasitism
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a relationship in which one organism, the parasite, obtains its food at the expense of the other animal, host
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mutualism
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both organisms benefit from the symbiotic relationship
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commensalism
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a relationship in which one organism benefits while the other organism is neither harmed nor helped signifucantly
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ecological succession
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the process of community change
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primary succession
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the process when a community arises in a lifeless area that has no soil
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secondary succession
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change following a disturbance that damages an existing community but leaves the soil intact
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introduced species
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species moved by humans to new geographic areas, either intentionally or accidentally
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