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population ecology &
types
studies the properties of populations-population size- population density-patterns ofdispersion-demographics- population growth-limits on population growth TERM 2
population size
DEFINITION 2 the number of individuals living in the defined area TERM 3
factors that alter population
size
DEFINITION 3 -birth-death-immigration-emigration*removes individuals TERM 4
how to estimate the size of a population
DEFINITION 4 -basic census-mark recapture TERM 5
basic census
DEFINITION 5 count all individuals in a group
mark recapture
trap some individuals; mark and release them; note marked individuals in recapture TERM 7
population density
DEFINITION 7 the number of individual organisms per unity area within the defined geographical rangepopulation density = total population/total land areadifferent species exist at different densities in the same environmentthe same species may achieve one density in one environment bu another in another environment TERM 8
pattern of dispersion
DEFINITION 8 how a population is distributed in space-clumped-uniform- random TERM 9
clumped pattern of dispersion
DEFINITION 9 most frequent; aggregations (high densities) in resource-rich areasex.humans that live near cities TERM 10
uniform
DEFINITION 10 equal spacing between individualsex.territorial animals
limits on population growth
-carrying capacity-density dependent factors-density independent factors TERM 17
carrying capacity
DEFINITION 17 the maximum number of individuals that can be supported in a given environmentif all plant growth fed humans and nothing else, earth's resources can support a human population of 20 million TERM 18
density dependent factors
DEFINITION 18 these factors increase with population size-limited food supply-increased risk of disease-increase in waste levels TERM 19
density independent factors
DEFINITION 19 factors not influenced by population numbers-droughts, temperature extremes, natural disasters
