# Community Ecology: Feel the Love - Crash Course Ecology #4

An episode of [CrashCourse](https://invisiblenetwork.ai/podcast/6809119751), 4 Nov 2026, 17 min.

Audio: https://traffic.megaphone.fm/HD5306022403.mp3

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/c/competitive_exclusion_principle.htm http://www.youtube.com/watch?v=GbRPDGikcnc http://www.instruction.greenriver.edu/mcvay/ES204%20DE/ES%20docs/animations/gause.swf http://www.sciencedaily.com/articles/e/ecological_niche.htm http://www.stanford.edu/group/stanfordbirds/text/essays/MacArthur's_Warblers.html http://uts.cc.utexas.edu/~varanus/MacArthur.html http://www.jstor.org/discover/10.2307/1383283?uid=3739960&uid=2129&uid=2&uid=70&uid=4&uid=3739256&sid=21101174112437 http://www.cals.ncsu.edu/course/ent591k/symbiosis.html http://www.eoearth.org/article/Community_ecology http://livingseas.org/2011/01/22/killer-whales-stalk-greys/ http://www.ecy.wa.gov/programs/sea/pugetsound/beaches/pool.html http://www.visitolympicpeninsula.org/tidepools.html http://www.annualreviews.org/doi/abs/10.1146/annurev.mi.04.100150.000413?journalCode=micro http://eol.org/pages/484359/overview http://www.geog.ubc.ca/biodiversity/efauna/IntroductiontoSeaAnemones.html http://www.daviddarling.info/encyclopedia/S/symbiosis.html http://blogs.discovermagazine.com/discoblog/2012/03/13/hermit-crab-moves-inside-a-living-sea-anemone-using-it-like-a-shell/ http://sites.sinauer.com/ecology2e/webext11.1.html http://www.stanford.edu/group/stanfordbirds/text/essays/MacArthur's_Warblers.html http://www.annualreviews.org/doi/pdf/10.1146/annurev.es.06.110175.000245 Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids Learn more about your ad choices. Visit megaphone.fm/adchoices

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