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24 Cards in this Set

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