26 terms

vocab. set 6C

population density
number of individuals per unit area
movement of individuals into an area p=occupied by an existing population
movement of individuals out of an area
exponential growth
growth pattern in whic 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
limiting factor
factor that causes the growth of a population to decrease
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 relationship
limiting factor that affects all populations in similar ways, regardless of size
age-structure diagram
graph of the number of males and females within different age groups of a population
renewable resource
resource that can regenerate quickly and is replaceable
nonrenewable resource
resource that cannot be replenished by natural processes
sustainable development
using natural resources at a rate that does not deplete them
soil erosion
wearing away of surface soil by water and wind
in areas with dry climates, a process caused by a combination of poor farming practices, overgrazing, and drought that turns productive land into desert
destruction of forests
acid rain
rain containing nitric and sulfuric acids
greenhouse effect
natural situation in which heat is retained in earths atmosphere by carbon dioxide, methane, water vapor, and other gases
biological diversity, the sum total of the variety of organisms in the biosphere
endangered species
species whose population size is rapidly declining and will become extinct if the trend continues
biological magnification
increasing concentration of a harmful substance in organisms at higher tropic levels in a food chain or web.
invasive species
plants and animals that have migrated to places where they are not native
wise management of natural resources including the preservation of wildlife and habitats
ozone layer
atmospheric layer in which ozone gas is relatively concentrated
global warming
increase in the average temperatures on earth