Studied by 5 people
affluence
having a lot of money.
age distribution
the comparative percentages of different age groups within a population.
asexual reproduction
divide to form new individuals that are identical to the original parent figure.
biotic potential
the inherent productive capacity.
birthrate
the number of individuals born per thousand individuals in the population per year.
carrying capacity
the maximum sustainable population for a species in an area.
death phase
the portion of the population growth curve of some organisms that shows the population declining.
death rate
the number of deaths per thousand individuals in the population per year.
deceleration phase
the part of the population growth curve in which the rate of population increase begins to decline.
demography
the study of human populations, their characteristics, and their changes.
density-dependent limiting factors
those limiting factors that become more severe as the size of the population increases.
dispersal
migration of organisms from a concentrated population into areas with lower population densities.
doubling time
to determine how much time is needed to double the population.
ecological footprint
the area of earth's productive land and water required to supply the resources that an individual or population demands as well as to absorb the wastes that the individual or population produces.
emigration
the movement out of ana rea that was once one's place of residence.
environmental resistance
the combination of all environmental influences that tend to keep the population stable.
exponential growth phase (log phase)
a period during population growth when the population increases at an ever-increasing rate.
extrinsic limiting factors
factors that limit the population size and come from outside the population.
gross national income
an index that measures the total goods and services generated within a country as well as income earned and sent home by citizens of the country who ate living in other countries
immigration
the movement to an area where one has not previously resided.
intrinsic limiting factors
factors that limit the population size that come from within the population.
K-strategists
organisms that typically reach a stable population as the population reaches carrying capacity
lag phase
the initial stage of population growth during which growth occurs very slowly
less-developed countries
countries of the world that typically have a per capita income of less than US $15,000
limiting factors
the primary condition of the environment that determines the population size of an organism.
more-developed countries
countries of the world that typically have a per capita income that exceeds US $15,000
mortality
the number of deaths per year
natality
the number of individuals added to the population through reproduction over a particular time period
population
a group of individuals of the same species occupying a given area
population density
the measure of how close organisms are to one another, generally expressed as the number of organisms per unit area.
population growth rate
the rate at which additional individuals are added to the population; the birth rate minus the death rate.
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
replacement fertility
the number of children per woman needed just to replace the parents.
sex ratio
comparison between the number of males and females in a population
sexual reproduction
the production of numerous seeds, but the seeds must land in appropriate soil conditions before they will germinate to produce a new individual
stable equilibrium phase
the phase in a population growth curve in which the birth rate and death rate become equal
standard of living
an abstract concept that attempts to quantify the quality of life of people. Several factors included in an analysis of the standard of living are: economic well-being, health conditions, and the ability to change one's status in society
survivorship curve
a graph that shows the proportion of individuals likely to survive at each age
total fertility rate
the number of children born per women per lifetime
zero population growth
the stabilized growth stage of human during which births equal deaths and equilibrium is reached
Note 
Flashcard (111)