edge effect
noun
: the effect of an abrupt transition between two quite different adjoining ecological communities on the numbers and kinds of organisms in the marginal habitat
Example Sentences
Recent Examples on the Web My current lipstick look as of late has been that hazy dreamy, blurred-edge effect. 
Sable Yong, Allure, 18 May 2018 Conservationists do already think about edge effects, says Haddad, but typically on the scale of tens of meters—not hundreds. Ed Yong, The Atlantic, 1 Nov. 2017
Sable Yong, Allure, 18 May 2018 Conservationists do already think about edge effects, says Haddad, but typically on the scale of tens of meters—not hundreds. Ed Yong, The Atlantic, 1 Nov. 2017 Word History
First Known Use
1933, in the meaning defined above
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