Population Ecology Ms. Klinkhachorn September 20, 2010 AP Biology

There is no DNA today. Save the handout for tomorrow. Get out a sheet of paper for notes and be ready when the bell rings.

What you NEED to know that we will not cover in class Biomes: aquatic and terrestrial and the characteristics of each – I will give you a graphic organizer so that you can organize your notes on them if you want – Flash cards are also a good option

Population Ecology 3 characteristics of a population: – Density – Dispersion – Demographics

Density Once you’ve defined the boundaries of a population, you can figure out the density Density is variable – it changes all the time – Emigration and immigration, lack of resources, etc Density is the number of individuals in an area or volume – # of individuals in a population / area or volume – Example: 1500 oak trees / square mile

Dispersion How populations are dispersed helps ecologists examine social interactions and environmental interactions 3 main patterns: – Clumped – Uniform – Random

Clumped

Uniform

Random

Dispersion Patterns What are the advantages and disadvantages of each? Dispersion Pattern AdvantagesDisadvantages Clumped Uniform Random

Demographics Demography – study of the vital statistics of population and how they change over time Statistics in the form of: – Life Tables – Survivorship Curves

Life Table

Survivorship Curve

Survivorship Curves CharacteristicsType 1Type 2Type 3 Description Offspring Example Which curves can be associated with semelparity? Iteroparity?