What are ecotones? Explain by giving examples. Also write a note on 'edge effect'. (UPSC 2022, 10 Marks, )

इकोटोन्स क्या हैं? उदाहरण देकर समझाएं। 'किनारा प्रभाव' पर भी एक नोट लिखें। (What are ecotones? Explain by giving examples. Also write a note on 'edge effect'.)