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A transition zone between habitats of two different plant communities, such as forest and grassland; the dividing line between two different ecological communities. It has some of the characteristics of each bordering community and often contains species not found in the overlapping communities. An ecotone may exist in a broad or narrow area. The influence of the two bordering communities on each other is known as the edge effect. An ecotonal area often has a higher density of organisms of one species and a greater number of species than are found in either individual community. Some organisms need this transitional area for activities such as courtship, nesting, or foraging for food.