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22 terms

Prentice Hall Biology Chapter 5

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population density
number of individuals per unit of area
immigration
movement of individuals into an area occupied by an existing population
emigration
movement of individuals out of a population
exponential growth
growth pattern in which the individuals in a population reproduce at a constant rate
logistic growth
growth pattern in which a population's growth rate slows or stops following a period of exponential growth
carrying capacity
largest number of individuals of a population that a given environment can support
density-dependent limiting factor
limiting factor that depends on population size
predator-prey relationship
mechanism of population control in which a population is regulated by predation
density-independent limiting factor
limiting factor that affects all populations in similar ways, regardless of population size
demography
scientific study of human populations
demographic transition
change in a population from high birth and death rates to low birth and death rates
limiting factor
factor that causes the growth of a population to decrease
age-structure diagram
graph of the numbers of males and females within different age groups of a population
population
group of individuals of the same species that live in the same area
species
group of similar organisms that can breed and produce fertile offsprings
biodiversity
biological diverstity; the sum total of the variety of organisms in the biosphere
renewable resources
resource that can regenerate quickly and that is replaceable
nonrenewable resources
resource that cannot be replenished by natural processes
green revolution
introduction of intensive farming practices that lead to a substantial increase in crop yields
biological magnification
increasing concentration of a harmful substance in organisms at higher trophic levels in a food chain or food web
invasive species
plants and animals that have migrated to places where they are not native
monoculture
farming strategy in which large fields are cleared, plowed, and planted with a single, highly productive crop year after year