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23 Cards in this Set
- Front
- Back
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the rate of population increase under ideal conditions uses equation G=rN *blue
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exponential growth model
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the average contribution of each individuals in the population growth.
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per capita rate of increase (stands for r)
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environmental factors that restrict population growth
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limiting factors
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a description of idealized population growth that is slowed by limiting factors as the population size increases *red
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logistic growth model
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maximum population size that a particular environment can sustain
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carrying capacity
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rates declining birth rates and rising death rates in response to increasing population density
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density-dependent
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traits that affect an organism's schedule of reproduction and death make up its
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life history
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Ecologists hypothesize that selection for this set of life history traits occurs in environments where resources are abundant, permitting exponential growth.
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r-selection b/c r is maximized
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Ecologists hypothesize that selection for this set of life history traits occurs in environments where the population size is near carrying capacity
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K-selection
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harvesting crops without damaging the resource
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sustainable resource management
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harvesting should be done at a level that produces consistent yield without forcing a population to decline
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maximum sustained yield
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a shift from zero population growth in which birth rates and death rates re high but roughly equal to zero population growth caracterized by low birth and death rates
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demographic transition
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demographic tool is helpful for predicting a population's future growth
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age structure
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situation which results from the increased proportion of women of childbearing age in the population
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population momentum
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plot survivorship as the proportion of individuals from an intial population that are alive at each age
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survivorship curves
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individuals in a population are spaced in an unpredictable way, without pattern
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random dispersion pattern
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interaction btwn the individuals of a population
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uniform dispersion pattern
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the chance of an individual in a given population surviving to various ages, tracks survivorship
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life tables
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which individuals are grouped in patches, most common in nature. ex. fungi
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clumped dispersion pattern
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refers to the way individuals are spaced within their area
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dispersion pattern
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number of individuals of a species per unit area or volume. ex. number of oak trees per sq km
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population density
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group of individuals of a single species living in the same area
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population
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concern with changes in population size and the factors that regulate populations over time
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population ecology
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