Interactions between species are what define ecological communities, and community ecology studies these interactions anywhere they take place. Although interspecies interactions are mostly competitive, competition is pretty dangerous, so a lot of interactions are actually about side-stepping direct competition and instead finding ways to divvy up resources to let species get along. Feel the love?

Table of Contents
1) Competitive Exclusion Principle 2:02
2) Fundamental vs. Realized Niche 3:48
3) Eco-lography / Resource Partitioning 5:25
4) Character Displacement 7:29
5) Mutualism 9:15
6) Commensalism 9:55

References
http://www.sciencedaily.com/articles/...
   • Competitive Exclusion Principle  
http://www.instruction.greenriver.edu...
http://www.sciencedaily.com/articles/...
http://www.stanford.edu/group/stanfor...
http://uts.cc.utexas.edu/~varanus/Mac...
http://www.jstor.org/discover/10.2307...
http://www.cals.ncsu.edu/course/ent59...
http://www.eoearth.org/article/Commun...
http://livingseas.org/2011/01/22/kill...
http://www.ecy.wa.gov/programs/sea/pu...
http://www.visitolympicpeninsula.org/...
http://www.annualreviews.org/doi/abs/...
http://eol.org/pages/484359/overview
http://www.geog.ubc.ca/biodiversity/e...
http://www.daviddarling.info/encyclop...
http://blogs.discovermagazine.com/dis...
http://sites.sinauer.com/ecology2e/we...
http://www.stanford.edu/group/stanfor...
http://www.annualreviews.org/doi/pdf/...

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