Which zone is characterized by species from two ecosystems and additional unique species?
An ecotone is the transition zone between two neighbouring ecosystems or communities. Because environmental conditions and resources overlap, it can contain species from both adjoining systems as well as edge specialists that occur mainly in the transition. This combination can produce the edge effect—locally elevated richness, abundance, or interaction intensity. Examples include a forest–grassland margin, an estuary between river and sea, or a marsh–upland boundary. Elevated diversity is not inevitable: abrupt human-created edges may exclude interior specialists, increase predation or invasi
Ref: NCERT Biology Class 12, Ch. 15 Biodiversity and Conservation