edge effect

noun Ecology.
the tendency toward greater variety and density of plant and animal populations in an ecotone.

Origin:
1930–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
edge effect   (ěj)  Pronunciation Key 
The influence that two ecological communities have on each other along the boundary (called the ecotone) that separates them. Because such an area contains habitats common to both communities as well as others unique to the transition zone itself, the edge effect is typically characterized by greater species diversity and population density than occur in either of the individual communities.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In many cases, edge effect may determine the distribution and densities of small mammal populations.
The edge effect is maximized by feathering all harrowing boundaries.
The decommissioning will reduce edge effect and habitat fragmentation.
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