construction of dams decline of fish populations Two significant key global river issues Dams reduce river levels Dams block rivers Riparian (streamside) vegetation is harmed Water quality and physical changes Effect of dams on fish migration Socioeconomic impact of dams Dam turbines hurt fish Dams increase predator risk Dams hold back silt, debris, and nutrients Dams alter timing of river flows ENVIS Centre on wetland eosystems including inland wetlands Picture Courtesy: Mohd. Zeesham Malik Poster No.: SACONENVIS#014 Poster Concept by Dr. P.A.Azeez, Dr. Goldin Quadros, Dr. B. Hemambika, Ms. A. Julffia Begam and Mr.A.Srinivasan. Design by Ms. A. Julffia Begam. Sálim Ali Centre for Ornithology and Natural History,Anaikatty, Coimbatore - 641 108, Tamil Nadu. PH.: 0422 2203100 E-mail:[email protected];[email protected] Website: www.sacon.in; www.saconenvis.nic.in.