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24 Cards in this Set
- Front
- Back
Birth rate
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the number of births occurring during a period of time
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death rate or mortality rate
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the number of deaths in a period of time
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life expectancy
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how long on average an individual is expected to live
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dispersion
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is the spatial distribution of individuals within the population
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population density
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measures how crowded a population is
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properties of populations
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1. population size
2. populations density 3. dispersion |
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age structure
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the distribution of individuals among different ages in a population
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survivorship curves
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the graph of a species mortality rate data
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growth rate
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of a population as the amount by which a populations size changes in a given time
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immigration
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is the movement of individuals into a populatoin
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emigration
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is the movement of individuals out of the population
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exponential model
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of population growth dewscribes a population that increases rapidly after only a few generations
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exponential growth
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the larger the population gets the faster is grows
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Limiting factor
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a factor that restrains the growth of a population
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logistic model
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of population growth builds on the exponential model but accounts for the influence of limiting factors
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carry capacity
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the number of individuals the environment can support over a long period of time
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logistic growth
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a model of population growth in which birth and death rates vary with population size and are weual at the carrying capacity
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density independent factors
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a variable that affects populatoin size regardless of population density
EX:weather, floods, fires |
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Density dependent factors
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a variable related to the density of a population that affects population size
EX:shortage of food, nesting sites |
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inbreeding
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mating with relatives
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hunter-gatherer lyfestyle
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a nomadic way of life in which food is found by hunting animals and gathering uncultivated plants, fruits and shellfish
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agricultural revolutions
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led to profound changes in every aspect of life
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developed countries
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includes all of the worlds modern industrialized countries such as us japan germany france,uk, australia, canada, and russia
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developing countries
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a category that includes most countries in asia and all of the countries in central america, south america, and africa...these countries are poorer
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