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22 Cards in this Set

  • Front
  • Back
age distribution
the comparative percentages of different age groups within a populaton
biotic potential
the inherent reproductive capacity
the number of individuals born per thousand individuals in the population per year
carrying capacity
the optimum number of individuals of a species that can be supported in an area over an extended period of time
the portion of the population growth curve of some organisms that show the population declining
death rate
the number of death per thousand individuals in the population per year
density dependant limiting factors
those limiting facts that become more sever as the suze of the population increases
density independent limiting factors
those limiting factors that are not affected by population size
migration of organisms from a concentrated population into areas with lower population densities
movement out of an area that was once one's place of residence
environmental resistance
the combination of all environmental influences that tend to keep populations stable
exponential growth phase
the period during population growth when the population increases at an ever-increasing rate
movement into an area where one has not previosly resided
large organisms that have relatively long lives, produce few offspring, provide care for their offspring, and typically have populations that stabilize at the carrying capacity
lag phase
the initial stage of population growth during which growth occurs very slowly
limiting factor
the one primary condition of the environment that determines population size of an organism
the number of deaths per year
the number of individuals added to the population through reproduction
population density
a measure of how close organisms are to one another, generall expressed as the number of organisms per unit area
typically, a small organism that has a short life span, produces a large number of offspring,and does not reach a carrying capacity
sex ratio
comparison between the number of males and females in a population
stable equilibrium phase
the phase in a population growth curve in which th4e death rate and birthrate become equal