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E.S. Ch. 6 vocab
Chapter 6 Vocabulary Practice Terms
Question | Answer |
---|---|
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 |