Populations

Researchers study  Geographic range  Density distribution  Growth rate  Age structure

Density Distribution  Random  Uniform  Clumped  Act this out!

Density calculations.  Take the number of individuals and divide by the area.  Example

Population Growth  Exponential  Logistic

Example  Begin with one bacteria  Reproduction doubles size of population  Generation time is the exponent.

Factors that affect population growth.  Immigration  Emigration  Birth rate  Death rate

Logistic growth

Limiting factors  What do you think might limit or slow population growth?

Limiting factors  Competition  Predation  Parasitism  Disease  Unusual weather  Natural disaster  Which ones are density dependent?

Human population growth  When will we reach our carrying capacity?  You tube- human pop growth