Ecotone definitions

ē'kə-tōn', ĕk'ə-
A transitional zone between two communities containing the characteristic species of each.
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A transitional zone between two adjacent communities, containing species characteristic of either as well as other species occurring only within the zone.
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A transitional zone between two communities containing species characteristic of each.
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A transitional zone between two ecological communities, as between a forest and grassland or a river and its estuary. An ecotone has its own characteristics in addition to sharing certain characteristics of the two communities.
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A transition area between two adjacent ecological communities (ecosystems).
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Origin of ecotone

Combination of eco- (“ecology”) +‎ -tone, from the Greek τόνος (tónos, “tension”).