Emerging reservoir delta-backwaters: biophysical dynamics and riparian biodiversity

Deltas and backwater-affected bottomlands are forming along tributary and mainstem confluences in reservoirs worldwide. Emergence of prograding deltas, along with related upstream hydrogeomorphic changes to river bottomlands in the backwater fluctuation zones of reservoirs, signals the development of new and dynamic riparian and wetland habitats. This study was conducted along the regulated Missouri River, USA to examine delta-backwater formation and describe vegetation response to its development and dynamics. Our research focused specifically on the delta-backwater forming at the confluence of the White River tributary and Lake Francis Case reservoir. Objectives of the research were to: (1) describe and analyze the process of delta-backwater formation over space and time; (2) determine by field sampling and GIS mapping how vegetation has responded to development of the delta-backwater; and (3) compare the woody plant communities of the delta-backwater to those along free-flowing and r...