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Ch. 3 Population Checks and Balances

Across
A straight line of a known length used to sample a population.
Movement of individuals into an area. Immigration adds to population size. Compare with emigration.
A limiting factor that affects a population regardless of how crowded the population is.
A simple method of mark-recapture sampling.
A spreadsheet that helps an ecologist predict how populations will change over time.
A part of an ecosystem that slows or prevents population growth.
Down
The population size for a given area that humans will tolerate. Compare with carrying capacity.
A sampling method used to estimate population size in which individuals are caught, marked in some way, and released back into the population. After time has passed, another group of individuals is caught and checked for marks.
A limiting factor that affects a population in ways related to how crowded the population is.
The number of individuals in a population per unit of area.
The spacing of individuals in a population in relation to each other.
count of every individual in a population.
The number of individual organisms that make up a population
growth—A period of growth during which a population increases by multiplication rather than addition; when a population increases in proportion to its size.
Movement of individuals out of an area. Emigration subtracts from population size. Compare with immigration.
A count of a small portion of the individuals in a population. Samples are used to estimate the total number of individuals in a population.