Notes pg 103 Title: Populations How do populations change over time? What makes them change?

Population growth = the birth rate – the death rate

Types of growth Linear growth – steady increase

Types of growth Exponential growth – rapid increase

Island of many rabbits – pg 102 Linear growth – every day one new bunny is added to the population If I have 50 bunnies, how long until I have 100? Exponential growth – every day the population doubles If I have 50 bunnies, how long until I have 100?

Limiting factor = any factor that slows down or stops the growth of a population Write down 2-3 examples of a limiting factor -limited food or water -disease -predators -limited space

Carrying capacity – the number of organisms an environment can sustain If the population is below carrying capacity it will increase If the population is above carrying capacity it will decrease

Primary Succession – happens in land where nothing has grown before. Pioneer species move in and prepare the soil for later species Notes pg 88 Glue the diagram on pg 88 leaving space for notes

Secondary succession – happens after a natural disaster. The soil is mostly ok to live on, and the species that lived there before slowly come back

Logistic or S-shaped growth