Wilfred Wollheim
In understanding the environment as an integrated system, WSAG explores the physical, chemical and biological processes that shape hydrological systems, with emphasis on the unique role of humans as agents of change. Our research and educational programs cross the boundaries of traditional scientific disciplines to foster interdisciplinary understanding of environmental change. Through field monitoring, whole ecosystem experiments, novel in situ sensor deployments, and dynamic hydrological and ecosystem modeling, we attempt to understand hydrological and biogeochemical dynamics at scales ranging from individual ecosystems, to whole river systems, to the global systems of inland waters. Built on strong collaborations that are national and international in scope, our group also serves as a teaching platform for the next generation of ecosystem and earth system scientists.
The success of the Water Systems Analysis Group reflects a rapidly emerging scientific field which pursues integrative studies of hydrology, biogeochemistry, and human-water interactions that is necessary to analyze the full dimension of anthropogenic change at local, regional, and global scales.
Courses Taught
- INCO 790: Adv Rsrch Exp/Natural Resource
- NR 504: Freshwater Resources
- NR 707: Environmental Modeling
- NR 751: Aquatic Ecosystems
- NR 791: Proj/Environmental Science I
- NR 905: Grant Writing
- NR 993: Sem/ Science Denialism
Selected Publications
Wollheim, W. M., Bernal, S., Burns, D. A., Czuba, J. A., Driscoll, C. T., Hansen, A. T., . . . Wohl, E. (2018). River network saturation concept: factors influencing the balance of biogeochemical supply and demand of river networks. Biogeochemistry, 141(3), 503-521. doi:10.1007/s10533-018-0488-0
Hopkinson, C. S., Morris, J. T., Fagherazzi, S., Wollheim, W. M., & Raymond, P. A. (2018). Lateral Marsh Edge Erosion as a Source of Sediments for Vertical Marsh Accretion. Journal of Geophysical Research: Biogeosciences, 123(8), 2444-2465. doi:10.1029/2017jg004358
Koenig, L. E., Song, C., Wollheim, W. M., Rüegg, J., & McDowell, W. H. (2017). Nitrification increases nitrogen export from a tropical river network. Freshwater Science, 36(4), 698-712. doi:10.1086/694906
Wollheim, W. M., Mulukutla, G. K., Cook, C., & Carey, R. O. (2017). Aquatic Nitrate Retention at River Network Scales Across Flow Conditions Determined Using Nested In Situ Sensors. Water Resources Research, 53(11), 9740-9756. doi:10.1002/2017wr020644
Contosta, A. R., Adolph, A., Burchsted, D., Burakowski, E., Green, M., Guerra, D., . . . Wollheim, W. (2017). A longer vernal window: the role of winter coldness and snowpack in driving spring transitions and lags. Global Change Biology, 23(4), 1610-1625. doi:10.1111/gcb.13517
Deegan, L. A., Johnson, D. S., Warren, R. S., Peterson, B. J., Fleeger, J. W., Fagherazzi, S., & Wollheim, W. M. (2012). Coastal eutrophication as a driver of salt marsh loss. Nature, 490(7420), 388-392. doi:10.1038/nature11533
Beaulieu, J. J., Tank, J. L., Hamilton, S. K., Wollheim, W. M., Hall, R. O., Mulholland, P. J., . . . Thomas, S. M. (2011). Nitrous oxide emission from denitrification in stream and river networks. Proceedings of the National Academy of Sciences, 108(1), 214-219. doi:10.1073/pnas.1011464108
Webster, J. R., Mulholland, P. J., Tank, J. L., Valett, H. M., Dodds, W. K., Peterson, B. J., . . . Wollheim, W. M. (2003). Factors affecting ammonium uptake in streams - an inter-biome perspective. Freshwater Biology, 48(8), 1329-1352. doi:10.1046/j.1365-2427.2003.01094.x
Peterson, B. J. (2001). Control of Nitrogen Export from Watersheds by Headwater Streams. Science, 292(5514), 86-90. doi:10.1126/science.1056874
Mulholland, P. J., Tank, J. L., Sanzone, D. M., Wollheim, W. M., Peterson, B. J., Webster, J. R., & Meyer, J. L. (2000). NITROGEN CYCLING IN A FOREST STREAM DETERMINED BY A15N TRACER ADDITION. Ecological Monographs, 70(3), 471-493. doi:10.1890/0012-9615(2000)070[0471:nciafs]2.0.co;2
Most Cited Publications