25 terms

javila79TEACHER

Immigration

the number of people that move into the country

Emmigration

the number of people that move out of the country

Crude Birth Rate (CBR)

the number of births per 1,000 individuals per year

Crude Death Rate (CDR)

the number of deaths per 1,000 individuals per year

Global Population Growth Rate

[CBR - CDR] / 10

(expressed as percentage)

(expressed as percentage)

National Population Growth Rate

[(CBR + immigration) - (CDR + emigration)] / 10 (expressed as percentage)

Doubling Time

The number of years it takes the population to double assuming the growth rate is constant. This number does not depend on the size of the population

70 / r

r is a percentage but use whole number (use 2 for 2%)

70 / r

r is a percentage but use whole number (use 2 for 2%)

Total Fertility Rate (TFR)

an estimate of the average number of children that each woman in a population will bear throughout her childbearing years.

Replacement Level Feritlity

the TFR required to offset the average number of deaths in a population so that it remains stable. Typically the _______ is just over 2 children.

Life Expectancy

the average number of years that an individual in a particular year in a particular country can be expected to live

-generally higher in countries with better healthcare, high resource consumption

-generally higher in countries with better healthcare, high resource consumption

Family Planning

the regulation of the number or spacing of offspring through the use of birth control

- when women have access to this birth rates drop

- when women have access to this birth rates drop

Impacts on TRF

Education

-more education typically = fewer children

Women in the workforce

-women working = fewer children

Family Planning (including contraceptives)

-contraceptives = less children

Income

-less income = more kids to help out

Cultural/Religous values

-large families

-abortion-abstinence

Health Care/Mortality Rate

-Better health care=less kids because they survive.

-more education typically = fewer children

Women in the workforce

-women working = fewer children

Family Planning (including contraceptives)

-contraceptives = less children

Income

-less income = more kids to help out

Cultural/Religous values

-large families

-abortion-abstinence

Health Care/Mortality Rate

-Better health care=less kids because they survive.

population

composed of all individuals that belong to the same species and live in a given area at a particular time

population size

the total number of individuals within a defined area at a given time

population density

the number of individuals per unit area (or volume for aquatic organisms) at a given time

sex ratio

the ratio of males to females

age structure

a description of how many individuals fit into particular age categories

limiting resource

a resource that a population cannot live without and which occurs in quantities lower than the population would require to increase in size

a resource that a population cannot live without

a resource that a population cannot live without

density-dependent factors

individual's probability of survival and reproduction in a manner that depends on the size of the population

carrying capacity; k

population growth slowed as population size increased. There was a limit to how many individuals an ecosystem can support

Density-independent factors

have the same effect on an individuals probability of survival and amount of reproduction at any population size

intrinsic growth rate; r

under ideal conditions, with unlimited resources available, every population has a particular maximum potential for growth

logistic growth model

describes a population whose growth is initially exponential, but slows as the population approaches the carrying capacity of the environment

exponential growth model

under ideal conditions, the future size of the population depends on the current size of the population, the intrinsic rate of the population, and the amount of time over which the population grows

overshoot

when the population becomes larger than the spring carrying capacity