A transition zone between two different ecological communities is known as

An ecotone is a transition area between two biological communities, where two different ecosystems meet and integrate. It may be narrow or wide, and it may be local (the zone between a field and forest) or regional (the transition between forest and grassland ecosystems).

• Ecotone: Often contains species from both bordering communities and may also contain unique species not found in either, a phenomenon known as the edge effect.
• Ecocline: A gradual, continuous change in the composition of species along an environmental gradient (e.g., altitude or salinity).
• Ecozone: A large-scale biogeographic division of the Earth's surface based on the distribution of plants and animals.
• Ecotype: A genetically distinct population within a species that is adapted to specific environmental conditions.