Wake-up 1.What is commensalism? 2.How is predation different from parasitism? 3. E.coli in our stomach helps us break down the food that we consume. What.

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Wake-up 1.What is commensalism? 2.How is predation different from parasitism? 3. E.coli in our stomach helps us break down the food that we consume. What they break down is a food source for the bacteria as well. What type of symbiosis (community interaction) is this an example of?

Populations

What is a Population? Group of similar species/individuals

Why study populations? To predict potential changes in populations; an increase or decrease could have dramatic effects

Factors that can cause a population change: 1. Number of Births

Factors that can cause a population change: 2. Number of Deaths

Factors that can cause a population change: 3. Immigration- Coming into a new environment

Factors that can cause a population change: 4. Emigration: Leaving an environment

Formula for Population Increase # Births and Immigration is GREATER than the # of Deaths and Emigration

Formula for Population Decrease # Births and Immigration is LESS than the # of Deaths and Emigration

J-Shaped Growth Curve (Exponential) # of Individuals Time Rapid Growth Slow Growth

Organisms: J-shaped Graph Organisms with a rapid life cycle; Bacteria, Viruses, Algae, Yeast, etc.Bacteria (Watch Video)

Can the organisms in J-shaped graphs grow infinitely (forever)? Short life spans; they are born, they reproduce, and they die because of limited resources (no more food, water, etc)

S-Shaped Growth Curve (Logistic) # of Individuals Time Rapid Growth Slow Growth Carrying Capacity Leveling Off

Carrying Capacity Maximum number of individuals a population can support (Watch Video)

Limiting Factors Factors that control population growth; Available resources

Organisms: S-shaped Graph Organisms with a long life cycle; most plants and animals (including humans)

Human Growth Curve (Watch Video)

Analyzing Human Population Growth Age Structure Pyramid: Compares the number of males and females within certain age groups of a population

What is the purpose of an age structure diagram? To predict potential population changes

Look at the numbers of pre-reproductive (0- 14), reproductive (15-44), and post- reproductive (45-85+) Slow Growth Decline Growth Rapid Growth

Population Pyramids (aka Age-Structure Diagrams) Watch Video

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