http://en.wikipedia.org/wiki/Population_ecology
https://home.comcast.net/~sharov/PopEcol/lec1/whatis.html
http://www.nature.com/scitable/knowledge/population-ecology-13228167
http://www.eoearth.org/view/article/155311/
http://education-portal.com/academy/lesson/population-ecology-definition...
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