Populations

What is a population? Group of organisms that belong to the same species and live in a particular place at a particular time

Population Density

Dispersion

Survivorship Curve

Type III Survivorship = R selected Because they live in an unstable environment with many densitry independent limiting factors they… 1.Remain small 2.Use little energy to make each individual 3.Produce many offspring 4.Mature early 5.Die early 6.Individuals reproduce only once

Type I or II survivorship = K selected Because they live in a stable environment with many density dependent limiting factors they… 1.Are large 2.Use a lot of energy to make each individual 3.Produce few offspring 4.Mature slowly 5.Have long life expectancy 6.Reproduce more than once

Immigration vs. Emigration

Calculate the growth rate if… There is a population of 1500 people 50 people die in one year 75 people are born in the same year

Growth rate = birth rate – death rate Birth rate = # of births/total population Death rate = # of deaths/total population When will population size increase? Decrease?

Exponential Model In order for this to occur, the population requires _____________ resources.

Logistic Model What is K?

Density Independent Factors What are some examples?

Density Dependent Factors What are some examples?

Human Population

Developed vs. Developing Countries