Demography notes

Type 1 graph

Lower infant and older population mortality

Type 2 graph

Survival rate is equal at all stages of life

Type 3 graph

Has a high birth rate yet high infant mortality

Population size

Amount of individuals in a population. higher population size, more limited supplies.

Population Density

#of individuals/area

clumped dispersion

Patches of individuals living in a certain area

uniform dispersion

all individuals separated by exact amount of space

Random Dispersion

All individuals at a randomly assigned to places

Population growth

Amount of growth in a population that is usually determined by available resources

Logistical curve/ growth

A curve in a graph that shows how how much a population could grow if it wasn’t facing limited resources

Carrying capacity

The largest amount of growth that a population can have with limited resources

Density dependent factors

Factors that depend on amount of organisms that use them. (dieses, competition, predication)

Density independent factors

Factors that animals have no control over and usually affects more than one population. (natural disasters, humans, weather)

Niche

The best habitat for population to grow. (u living ur best life)

R - strategist

Short lifespan, grow quickly, produce many offspring (turtles, fish, frog)

K - Strategist

longer lifespans and less offspring (gorillas, lions)