A change in crop pattern - from food crop to cash crop - is one of the main reasons for poverty and backwardness in Memarikudy, the remotest tribal settlement in Idukki wildlife sanctuary. Lack of work in forests, improper management of forest wealth and a shift in the sources of income have also adversely affected the livelihood of tribal communities in Kollathikavu and Mulla settlements. This was revealed by a first-of-its-kind social and economic survey of the tribal people, organised by a team of students of Amrita Vishwa Vidyapeetham, Coimbatore, led by anthropologist K. Priya.