Scientists & Staff
Current ResearchMy research focuses on the effects of change on invertebrate ecology, food webs, organic matter dynamics, and nutrient cycling in freshwater ecosystems, particularly small streams which are most tightly linked to the terrestrial environment. My colleagues and I employ functional measures such as leaf and wood processing rates, secondary production, and diet analyses to assess ecosystem response to a variety of management practices over long time periods and large scales. Our current projects include:
- Linking the complexity of terrestrial leaf inputs with stream ecosystem function
- Examining faunal diversity in peatland watersheds at Marcell Experimental Forest
- Comparing the capacity of forest streams for nutrient uptake in a high and low nitrogen ecosystem
- Quantifying headwater stream food webs in the Salmon Trout River, home to a threatened population of coaster brook trout
- Evaluating impacts of riparian timber harvesting on aquatic organisms and habitat
Why This Research is ImportantWater quality and quantity has become a critical issue for a growing population. Properly managed forests provide a variety of goods and services including clean water for people and wildlife. Small streams, tightly linked to forests and the larger river network, are often overlooked components of the landscape. Understanding the functional responses of stream ecosystems to local and global changes are key to better management decisions and the protection, maintenance, or restoration of the ecosystem services they provide.
- University of Georgia, Ph.D. Ecology,
- Michigan State University, M.S. Fisheries and Wildlife,
- University of Wisconsin-Whitewater, B.S. Biology,
- American Institute of Biological Sciences
- Ecological Society of America
- North American Benthological Society
- Sigma Xi, The Scientific Research Honor Society
- Michigan Entomological Society
Featured Publications & Products
- Wallace, J. Bruce; Eggert, Susan L; Meyer, Judy L.; Webster, Jackson R. 2015. Stream invertebrate productivity linked to forest subsidies: 37 stream-years of reference and experimental data. Ecology. 96(5)
- Eggert, Sue L.; Wallace, J. Bruce; Meyer, Judy L.; Webster, Jackson R. 2012. Storage and export of organic matter in a headwater stream: responses to long-term detrital manipulations. Ecosphere. 3(9): 75. http://dx.doi.org/10.1890/ES12-00061.1.
- Batzer, Darold ; Wu, Haitao ; Wheeler, Terry ; Eggert, Sue. 2016. Peatland Invertebrates. In: Batzer, Darold; Boix, Dani, eds. Invertebrates in freshwater wetlands. Switzerland: Springer International Publishing: 219-250. Chapter 7.
- Wallace, J. Bruce; Eggert, S.L. 2009. Benthic invertebrate fauna, small streams. Encyclopedia of Inland Waters. 2: 173-190.
- Tavshunsky, Ilana ; Eggert, Susan L.; Mitchell, Carl P. J. 2017. Accumulation of Methylmercury in Invertebrates and Masked Shrews (Sorex cinereus) at an Upland Forest-Peatland Interface in Northern Minnesota, USA. Bulletin of Environmental Contamination and Toxicology
- Meyer, Judy L.; Strayer, David L.; Wallace, J. Bruce; Eggert, Sue L.; Helfman, Gene S.; Leonard, Norman E. 2007. The contribution of headwater streams to biodiversity in river networks. Journal of The American Water Resources Association Vol. 43, No. 1
- Eggert, Susan L.; Wallace, J. Bruce. 2003. Litter breakdown and invertebrate detritivores in a resource-depleted Appalachian stream. Arch. Hydrobiology 156(3): 315-338
- Olson, J. C.; Marcarelli, A. M.; Timm, A.L.; Eggert, S.L.; Kolka, R.K. 2017. Evaluating the Effects of Culvert Designs on Ecosystem Processes in Northern Wisconsin Streams. River Research and Applications
Publications & Products
- Hofmeister, Kathryn L.; Eggert, Sue L.; Palik, Brian J.; Morley, David ; Creighton, Emily ; Rye, Marty ; Kolka, Randall K. 2022. The Identification, Mapping, and Management of Seasonal Ponds in Forests of the Great Lakes Region. Wetlands
- McCarter, Colin P. R.; Eggert, Susan L.; Sebestyen, Stephen D.; Kolka, Randall K.; Mitchell, Carl P. J. 2022. Effects of Clearcutting and Residual Biomass Harvesting on Hillslope Mercury Mobilization and Downgradient Mercury Accumulation. Journal of Geophysical Research: Biogeosciences
- Eggert, Sue L.; Heiskary, Steven A.; Kolka, Randy K.; Hill, Brian H.; Monson, Bruce A.; Swain, Edward B. 2021. Chapter 2: Ecoregion 5.2.1 Northern lakes and forests: Marcell Experimental Forest, Minnesota. In: Ryan, Douglas F., ed. 2021. Biological responses to stream nutrients: a synthesis of science from experimental forests and ranges. Gen. Tech. Rep. PNW-GTR-981. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station: 15-44. Chapter 2.
- Rosemond, Amy D.; Bumpers, Phillip M.; Eggert, Sue ; Paul, Michael J. 2021. Chapter 14: Ecoregion 8.4.4 Blue Ridge: Coweeta Hydrologic Laboratory, North Carolina. In: Ryan, D.F., ed. Biological responses to stream nutrients: A synthesis of science from experimental forests and ranges. Gen. Tech. Rep. PNW-GTR-981. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station: 349-387. Chapter 14.
- Eggert, Susan L.; Wallace, J. Bruce; Meyer, Judy L.; Webster, Jackson R. 2020. Trophic basis of production of stream detritivores shifts with reduced forest inputs. Hydrobiologia
- McCarter, Colin P. R.; Sebestyen, Stephen D.; Eggert, Susan L.; Kolka, Randall K.; Mitchell, Carl P. J. 2020. Changes in hillslope hydrology in a perched, shallow soil system due to clearcutting and residual biomass removal. Hydrological Processes
- Youngquist, Melissa B.; Wiley, Chandra ; Eggert, Sue L.; D'Amato, Anthony W.; Palik, Brian J.; Slesak, Robert A. 2020. Foundation Species Loss Affects Leaf Breakdown and Aquatic Invertebrate Resource Use in Black Ash Wetlands. Wetlands
- Tsz-Ki Tsui, Martin ; Liu, Songnian ; Brasso, Rebecka L.; Blum, Joel D.; Kwon, Sae Yun; Ulus, Yener ; Nollet, Yabing H.; Balogh, Steven J.; Eggert, Sue L.; Finlay, Jacques C. 2019. Controls of Methylmercury Bioaccumulation in Forest Floor Food Webs. Environmental Science & Technology. 53(5): 2434-2440.
- Timm, A.; Higgins, D.; Stanovick, J.; Kolka, R.; Eggert, S. 2017. Quantifying fish habitat associated with stream simulation design culverts in northern Wisconsin. River Research and Applications
- Youngquist, Melissa B.; Eggert, Sue L.; D'Amato, Anthony W.; Palik, Brian J.; Slesak, Robert A. 2017. Potential effects of foundation species loss on wetland communities: A case study of black ash wetlands threatened by emerald ash borer. Wetlands
- Dolph, Christine L.; Eggert, Susan L.; Magner, Joe ; Ferrington, Leonard C.; Vondracek, Bruce. 2015. Reach-scale stream restoration in agricultural streams of southern Minnesota alters structural and functional responses of macroinvertebrates. Freshwater Science
- Marcarelli, Amy M.; Huckins, Casey ; Eggert, Susan L. 2015. Sand aggradation alters biofilm standing crop and metabolism in a low-gradient Lake Superior tributary. Journal of Great Lakes Research
- Braccia, A.; Eggert, S.L.; King, N. 2014. Macroinvertebrate colonization dynamics on artificial substrates along an algal resource gradient. Hydrobiologia. 727(1): 1-18.
- Mazur, M.; Mitchell, C.P.J.; Eckley, C.S.; Eggert, S.L.; Kolka, R.K.; Sebestyen, S.D.; Swain, E.B. 2014. Gaseous mercury fluxes from forest soils in response to forest harvesting intensity: A field manipulation experiment. Science of The Total Environment. 496: 678-687.
- Brooks, Robert T.; Eggert, Susan L.; Nislow, Keith H.; Kolka, Randall K.; Chen, Celia Y.; Ward, Darren M. 2012. Preliminary assessment of mercury accumulation in Massachusetts and Minnesota seasonal forest pools. Wetlands 32: 653-663.
- Coleman Wasik, Jill K.; Mitchell, Carl P.J.; Engstrom, Daniel R.; Swain, Edward B.; Monson, Bruce A.; Balogh, Steven J.; Jeremiason, Jeffrey D.; Branfireun, Brian A.; Eggert, Susan L.; Kolka, Randall K.; Almendinger, James E. 2012. Methylmercury declines in a boreal peatland when experimental sulfate deposition decreases. Environmental Science & Technology. 46(12): 6663-6671.
- Stelzer, Robert S.; Drover, Damion R.; Eggert, Susan L.; Muldoon, Maureen A. 2011. Nitrate retention in a sand plains stream and the importance of groundwater discharge. Biogeochemistry. 103: 91-107.
- Davis, John M.; Rosemond, Amy D.; Eggert, Sue L.; Cross, Wyatt F.; Wallace, J. Bruce. 2010. Nutrient enrichment differentially affects body sizes of primary consumers and predators in a detritus-based stream. Liminology and Oceanography. 55(6): 2305-2316.
- Davis, John M.; Rosemond, Amy D.; Eggert, Susan L.; Cross, Wyatt F.; Wallace, J. Bruce. 2010. Long-term nutrient enrichment decouples predator and prey production. Proceedings of the National Academy of Sciences. 107(1): 121-126.
- Merten, Eric; Hemstad, Nathaniel; Eggert, Susan; Johnson, Lucinda; Kolka, Randall; Vondracek, Bruce; Newman, Raymond. 2010. Relations between fish abundances, summer temperatures, and forest harvest in a northern Minnesota stream system from 1997 to 2007. Ecology of Freshwater Fish. 19: 63-73.
- Romito, Angela ; Eggert, Susan ; Diez, Jeffrey ; Wallace, J. 2010. Effects of seasonality and resource limitation on organic matter turnover by Chironomidae (Diptera) in southern Appalachian headwater streams. Limnology and Oceanography 55(3):1083-1092
- Ardón, Marcelo; Pringle, Catherine M.; Eggert, Susan L. 2009. Does leaf chemistry differentially affect breakdown in tropical vs temperate streams? Importance of standardized analytical techniques to measure leaf chemistry. Journal of the North American Benthological Society. 28(2): 440-453.
- Ardon, Marcelo; Pringle, Catherine M.; Eggert, Susan L. 2009. Does leaf chemistry differentially affect breakdown in tropical versus temperate streams? Importance of standardized analytical techniques to measure leaf chemistry. Journal of the North American Benthological Society
- Benstead, Jonathan P.; Rosemond, Amy D.; Cross, Wyatt F.; Wallace, J. Bruce; Eggert, Susan L.; Suberkropp, Keller; Gulis, Vladislav; Greenwood, Jennifer L.; Tant, Cynthia J. 2009. Nutrient enrichment alters storage and fluxes of detritus in a headwater stream ecosystem. Ecology. 90: 2556-2566.
- Entrekin, Sally A.; Wallace, J. Bruce; Eggert, Susan L. 2007. The response of chironomidae (Diptera) to a long-term exclusion of terrestrial organic matter. Hydrobiologia, Vol. 575: 401-413
- Cross, W.F.; Wallace, J.B.; Rosemond, A.D.; Eggert, S.L. 2006. Whole-system nutrient enrichment increases secondary production in a detritus-based ecosystem. Ecology, Vol. 87(6): 1556-1565
- Eggert, Susan L.; Wallace, J. Bruce. 2003. Reduced detrital resources limit Pycnopsyche gentilis (Trichoptera: Limnephilidae) production and growth. Journal North American Benthol. Society 22(3): 388-400
- Meyer, J.L.; Hax, C.; Wallace, J.B.; Eggert, S.L.; Webster, J.R. 2000. Terrestrial litter inputs as determinants of food quality of organic matter in a forest stream. Verhandlungen der Internationalen Vereinigung fur Theoretische und Angewandte Limnologie Volume 27 1346-1350
- Webster, J. R.; Tank, J. L.; Wallace, J. B.; Meyer, J. L.; Eggert, S. L.; Ehrman, T. P.; Ward, B. R.; Bennett, B. L.; Wagner, P. F.; McTammany, M. E. 2000. Effects of litter exclusion and wood removal on phosphorus and nitrogen retention in a forest stream. Verb. International Verein. Limnol. 27:1337-1340 November 2000
National Research Highlights
Black ash is a foundational species in the wetland forests of the northern Great Lakes region, affecting nearly all aspects of ecosystem function. A nonnative insect that has killed millions of ash trees in more than 25 states is edging closer to Minnesota’s black ash forests. USDA Forest Service scientists have unraveled the complex relationships between black ash and ecosystem functions and how loss of the species from emerald ash borer, and potential replacement by new tree species, will impact these relationships.