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1. Principles of ecology
Energy flow and productivity in ecosystems
This wikibook explains the basics of energy a flow within an ecosystem. If you go back one page in the tutorial it will also explain what an ecosystem is in case you are not aware of what it is.
When you visit this site you may think âhey this is a high school siteâ. Well you would be right as the name says it is for grades 9-12 education. The big thing is that first year biology often just covers what you learnt in high school. This site has a ton of links to the different cycles that keep our world going.
Population growth and regulation
The pinkmonkey site offers a quick tutorial on population ecology. It does not offer that much as far as advanced knowledge but it does explain all the terms and gives you a general idea of what you will need for the biology CLEP.
Community structure, growth, regulation
As usual the online biology book has a great section on ecosystems that explains biomes and other facts you will need for this section.
Habitat (biotic and abiotic factors)
This page from yahoo answers gives a good overview of what an abiotic and biotic factor is. The top answer also gives some examples to help you understand the difference.
Concept of niche
This tutorial is fairly extensive and was meant for a marine biology course but it explains the niche concept as well as other useful ecology terms. You will have to look through it and decide which parts are most applicable to this section.
This site is in PDF form so you will need adobe reader in order to view it. The page goes quite in depth with island biogeography but you can skim it for the relevant parts if you feel crunched for time.
A short wiki on evolutionary ecology that will get you understanding the basics of this fairly new ecological science.