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20 Cards in this Set
- Front
- Back
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population density
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number of individuals in a unit area
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age structure
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number of males and females of each age in a population
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immigration
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movement of individuals into an occupied area by the existing population
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emigration
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movement of individuals out of an area
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exponential growth
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growth pattern in which the individuals in a population reproduce at a constant rate
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logistic growth
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growth pattern in which a population growth slows and then stops
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carrying capacity
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largest number of individuals about particular species that environment can support
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limiting factor
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factor that causes population growth to decrease
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density dependent limiting factors
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limiting factor that affects all populations
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density independent limiting factors
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limiting factor that affects all populations regardless of the density
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demography
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study of scientific human populations
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demographic transition
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change in a population from high birth and death rates to low birth and death rates
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geographic range, population density, growth rate and she structure.
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list four characteristics that are used to describe a population
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what natural factors can change a population size?
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birth rate death rate immigration and emigration
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when do population grow exponentially?
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when resources are unlimited, few individuals died and many offspring are produced
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describe conditions that lead to competition in a population
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when populations become crowded individuals compete for food water space sunlight and other essentials
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.what is a density independent limiting factor?
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unusual weather such as hurricanes, droughts, or floods. also natural disasters such as wildfires.
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how has human population sized changed over time?
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in the beginning life was harsh limiting factors kept death rates very high. then there was exponential human population growth.
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what factors did Thomas Malthus think would eventually limit the human population?
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he's thought the human population would be regulated by competition, limited resources, parasitism and other density dependent factors.
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give examples of density dependent limiting factors
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factors include competition, predadation, herbivory, parasitism, disease, and stress from overcrowding.
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