Hit Parade (ch6) Flashcards
graphical representation of populations’ ages
age structure pyramids
the fraction of solar energy that is reflected back into space
albedo
the amount that the population would grow if there were unlimited resources in its environment
biotic potential
the number of live births per 1,000 members of the population in a year
birth rate (crude birth rate)
the maximum population size that can be supported by the available resources in a region
carrying capacity
the number of deaths per 1,000 members of the population in a year
death rate (crude death rate)
a model that’s used to predict population trends based on the birth and death rates as well as economic status of a population
demographic transition model
the amount of the earth’s surface that’s required to supply the needs of and dispose of the waste from a particular population
ecological footprint
the movement of individuals out of a population
emigration
the random fluctuations in the frequency of the appearance of a gene in a small isolated population, presumably owing to chance, rather than natural selection
genetic drift
the movement of individuals into a population
immigration
organisms that reproduce later in life, produce fewer offspring, and devote significant time and energy to the nurturing of their offspring
k-selected
when a population is well below the size dictated by the carrying capacity of its region, it will grow exponentially, but as it approaches the carrying capacity, its growth rate will decrease and the size of the population will eventually become stable
logistic population growth
the number of individuals of a population that inhabit a certain unit of land or water area
population density
the number of children a couple must have in order to replace themselves in a population
replacement birth rate
