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E.S. Ch. 6 vocab

Chapter 6 Vocabulary Practice Terms

age distribution the comparative percentages of different age groups within a population
biotic potential the inherent reproductive capacity
birthrate 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
death phase the portion of the population growth curve that shows the population declining
death rate the number of deaths per thousand individuals in the population per year
density-dependent limiting factors those limiting factors that become more severe as the size of the population increases
density-independent limiting factors those limiting factors that are not affected by population size
dispersal migration of organisms from a concentrated population into areas with lower population densities
emigration movement out of an area that was once one's place of residence
environmental resistance the combination of all environmental influnces that tend to keep populations stable
exponential growth phase the period during population growth when the population increases at an ever-increasing rate
immigration movement into an area in which one has not previously resided
k-strategists 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 factors the one primary condition of the environment that determines the success of an organism
mortality the number of deaths per year
natality the number of individuals added to the population through reproduction
population density a measure of how close organisms are to one another, generally expressed as the number of organisms per unit area
r-strategists 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 the death rate and birthrate become equal
Created by: rburrier