Nathan Schumaker is a research ecologist at the U.S. Environmental Protection Agency in Corvallis, Oregon. He specializes in simulation model development and applications, landscape ecology, and conservation biology. As part of his research, Schumaker developed the PATCH and HexSim simulation models, which have been used in viability assessments for many terrestrial wildlife populations. His current research projects include the study of stressor interactions, disease ecology, source-sink dynamics, habitat connectivity, and landscape genetics.

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The Willamette River is the 13th largest river in the United States, and its 29,727 square kilometer basin supports a mosaic of agricultural, timber, and recreational resources as well as several growing urban centers and their water supplies. The Willamette River Basin (WRB) has a Mediterranean climate with dry summers and wet winters. The …

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