Vocabulary
Population
The number of people living in an area.
Natality
Birth rate...
Birthrate
Ratio
Live births:Population
Live births:Population
Deathrate
Ratio
Deaths:Population
Deaths:Population
Surviorship curve
A graph showing the number of people of each age group surviving for each species.
All the graphs I found for this looked like a leaf. :)
All the graphs I found for this looked like a leaf. :)
Population Growth Rate
Yearly change in population, measured in percentage.
Sex Ratio
Ratio
Males:Females
Males:Females
Age Distribution
Population pyramid.
Population Density
The number of people in a set amount of space.
Dispersal
The act of distributing things.
Emigration
To leave one place to stay in another.
Immigration
Similar to Emigration, but instead of leaving one place, its coming to one place to stay from another.
Biotic Potential
How well a population with unlimited resources can reproduce.
Lag phase
Time between an action and a response.
Exponential Growth Phase
The time during population growth that the population growth rate keeps increasing.
Deceleration Phase
The declining growth rate phase.
Stable Equilibrium Phase
The phase in a population growth curve in which the death rate and birthrate become equal.
Limiting Factors
The primary condition of the environment that determines the population size for an organism.
Environmental Resistance
The combination of all environmental influences that tend to keep populations stable.
Extrinsic Limiting Factors
Factors that limit population size and that come from outside the population.
Intrinsic Limiting Factors
Factors that limit population size that come from within the population.
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.
Death Phase
The portion of the population growth curve of some organisms that show the population declining.
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.
R-strategist
Typically, a small organism that has a short life span, produces a large number of offspring, and does not reach a carrying capacity.
More developed countries
Countries of the world that typically have a per capita income that exceeds US$10,000; Europe, Canada, United States, Australia, New Zealand, and Japan.
Less Developed countries
Countries of the world that have a per capita income of less than US$5000
Ecological footprint
The area of the Earth's productive land and water required to supply the resources that an individual demands as well as to absorb the wastes that the individual produces.
Demography
The study of human populations, their characteristics, and their changes.
Total Fertility Rate
The number of children born per woman per lifetime.
Replacement Fertility
The number of children per woman needed just to replace the parents.
Zero Population Growth
The stabilized growth stage of human population during which births equal deaths and equilibrium is reached.
Age Distribution
The comparative percentages of different age groups within a population.
Gross National Income
An index that measures the total goods and services generated within a country as well as income earned by citizens of the country who are living in other countries.
Demographic Tranisition
The hypothesis that economies proceed through a series of stages, beginning with growing populations with high birth and death rates and low economic development.
Postwar baby boom
People born during an approximately 15-year period (1947-61) following World War II, when birthrates were much higher than today, and constitute a bulge in the age distribution profile.
Carrying Capacity
The optimum number of individuals of a species that can be supported in an area over an extended period of time.
Standard of Living
The necessities and luxuries essential to a level of existence that is customary within a society.