In this video, Paul Andersen explains how ecosystems work. It begins with a description of how life on the planet is organized from largest to smallest in biomes, ecosystems, communities, population and individuals. It describes the main terrestrial and aquatic biomes of the planet. It then describes interactions at the ecosystem level with food webs. It also explains the importance of the niche, keystone species and the edge effect.

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Music attribution

Introduction
Title: I4dsong_loop_main.wav
Artist: CosmicD
Link to the sound: http://www.freesound.org/people/CosmicD/sounds/72556/
Creative Commons Attribution License

Exit
Title: String theory
Artist: Herman Jolly
http://sunsetvalley.bandcamp.com/track/string-theory

All images are licensed under Creative Commons and Public Domain license:
Daderot. Kelp Forest Tank, Monterey Bay Aquarium, Monterey County, California, USA, April 20, 2012. Daderot. https://commons.wikimedia.org/wiki/File:Kelp_Forest_-_MBA_-_DSC06945.JPG.
"Ecological niche". Wikipedia, the free encyclopedia, May 17, 2015. https://en.wikipedia.org/w/index.php?titleEcological_niche&oldid662726986.
"File: PrecipitationTempBiomes.jpg." Wikipedia, the free encyclopedia, December 23, 2013. https://en.wikipedia.org/w/index.php?titleFile:PrecipitationTempBiomes.jpg&oldid587430172.
“Generalist and specialist species”. Wikipedia, the free encyclopedia, January 28, 2015. https://en.wikipedia.org/w/index.php?titleGeneralist_and_specialist_species&oldid644599063.
“Generalist and specialist species”. Wikipedia, the free encyclopedia, January 28, 2015. https://en.wikipedia.org/w/index.php?titleGeneralist_and_specialist_species&oldid644599063.
"Google image result for https://upload.wikimedia.org/wikipedia/commons/7/76/Edge_Effect.jpg." Accessed September 8, 2015. http://www.google.com/imgres?imgurlhttps://upload.wikimedia.org/wikipedia/commons/7/76/Edge_Effect.jpg&imgrefurlhttps://en.wikipedia.org/wiki/ Edge_effects&h2112&w2816&tbnid1l-bJ0vXrAqrpM:&tbnh160&tbnw213&usg__AUxYLJdRU0uacd52R_eDgKAk0f0&docidCKdWtQVgMZ5r7M&saX&ved0CCIQ9QEwAGoVChMIneyxtdfnxwIVAy -ICh 2FUg9k.
“Greater Yellowstone Ecosystem.” Wikipedia, the free encyclopedia, March 22, 2015. https://en.wikipedia.org/w/index.php?titleGreater_Yellowstone_Ecosystem&oldid653036516.
Joshfn. English: Primary succession is the process characterized by the establishment of soil and organisms in an area devoid of topsoil and vegetation., May 19, 2014. Own work. https://commons.wikimedia.org/wiki/File:AP_Biology_-_Primary_Succession_Drawing.svg.
KennyOMG. French: View of the Pahalgam valley, June 4, 2011. Personal work. https://commons.wikimedia.org/wiki/File:Pahalgam_Valley.jpg.
Laboratory/

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