Unit 3 Flashcards
Age distribution
The portion of people that are in different age groups (in certain population )
Age structure
Age distribution in certain population
Age structure pyramid
A graph used to demonstrate a populations growth
Birth control pill
A pill used by women to level hormones and prevent pregnancies
China one child policy
Limits the number of children in families to stop population growths in china
Contraceptives
Medical or physical preventatives to stop pregnancies
Crude birth rate
The number of births per 1000 people per year
Crude death rate
Number of deaths per 1000 individuals in a year
Demographic transition
A social, cultural, or economic change
Demography
The study of statistical changes in human population
Doubling time
The amount of time it will take to double a population
Biotic potential
The max rate a population can reproduce in ideal conditions
Birth rate
Number of live births per 1000 people
Carrying capacity
The max population size an environment sustain based on a number of factors
Death rate
Total number of deans in population per 1000 people
Density dependent factors
A factor that affects a population based on population density
Density independent factors
Factors that is independent to a populations density and will affect its survival all the same
Emigration
Leaving a country
Exponential growth
Growth that starts slowly then grows quicker as population increases
Extinction
Where every single member of a species is gone :(
Generalists
Animals who survive in numerous conditions w/ large range diet
Growth rates
Now a population changes in size
Immigration
Going/coming to a new country
Industrial stage
Population growth slows and stabilizes (stage 3, demography transition)
Infant mortality
Rate at which children under 5 die
K-selected species
Species with high parental care, few offspring, and typically long life spans (type | on survivorship curve)
Limiting factors
Abiotic or biotic factors that tend to slow or stop population growth
Life expectancy
How long the typical lifespan is in a species
Logistic curve mass
Population growth that slows as it reaches currying capacity, causes s shapes curve
Malthus, Thomas
Each and every animal has A carrying capacity, humans tend to overshoot
Population
A species of animal living in certain area
Population density
Number of people per unit of area
Population distribution
Dispersal of population in area
Population ecology
The study of population dynamics
Population size
Countable quantity representing number of individuals population
Post industrial stag
Population starts to shrink cus growth decreases (bulk of ages)
Pre industrial stage
Population is stable high death and birth rates
R-selected species
Low parental care, large amounts offspring, relatively short life (type ill )
Replacement fertility
How many offspring a female needs to have in order to keep stable population
Rule of 70
70/ population growth = doubling time
TFR
How many children a women is having
Transitional stage
Birth rates increase death rates decrease
Sex ratio
Male to female ratio
Specialists
Thrive in certain environment with limited diet
Survivor ship curves
Diagram that shows certain animal lifespans
Growth rate
Global = (CBR - CDR)/10 (for national add emigration and immigration
