Editing Competitive exclusion principle (section)

==History==
The competitive exclusion principle is classically attributed to [[Georgy Gause]],<ref name="gause1934">{{Cite book |last=Gause |first=Georgii Frantsevich |url=http://www.ggause.com/Contgau.htm |title=The Struggle For Existence |publisher=Williams & Wilkins |year=1934 |edition=1st |location=Baltimore |access-date=2016-11-24 |archive-url=https://web.archive.org/web/20161128142418/http://www.ggause.com/Contgau.htm |archive-date=2016-11-28 |url-status=dead}}</ref> although he actually never formulated it.<ref name=hardin60/> The principle is already present in Darwin's theory of natural selection.<ref name=Pocheville2015/><ref name="darwin1859">{{Cite book |last=Darwin |first=Charles |url=http://darwin-online.org.uk/content/frameset?itemID=F373&viewtype=text&pageseq=1 |title=On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life |publisher=John Murray |year=1859 |isbn=1-4353-9386-4 |edition=1st |location=London}}</ref>

Throughout its history, the status of the principle has oscillated between ''a priori'' ('two species coexisting ''must'' have different niches') and experimental truth ('we find that species coexisting do have different niches').<ref name=Pocheville2015/>