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Dr. Emma J. Rosi

Aquatic Ecologist | PhD, University of Georgia

Expertise
freshwater, invasive species, human impacts

845 677-7600 x232

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Emma Rosi is advancing our understanding of how land use, urbanization, and climate change shape freshwater ecosystems, with projects exploring environmental contaminants such as pharmaceutical and personal care products, aging wastewater infrastructure, environmental implications of agricultural GMOs, and the effects of dams.

Rosi directs the Baltimore Ecosystem Study (BES), a National Science Foundation Long Term Ecological Research site. As part of BES, Rosi is exploring the role that failing wastewater infrastructure plays in polluting streams and creating antibiotic-resistant ‘superbugs’. She is also revealing how prescription and illicit drugs that enter our waterways impact freshwater quality and aquatic life.

In addition to her work on human-driven threats to freshwaters, Rosi co-leads a long-term project, in collaboration with Yale University, investigating how wildebeest and hippos shape the food web in the Kenyan reach of Africa’s Mara River.

Rosi is a leader in the field of freshwater science and has conducted research on the role of  emerging contaminants shaping these systems.  Rosi serves on the  US Environmental Protection Agency’s Science Advisory Board and her research has implications for our understanding of anthropogenic stressors on freshwater ecosystems. 
 
Watershed studies at the Hubbard Brook Experimental Forest: Building on a long legacy of research with new approaches and sources of data
Campbell, John L., Lindsey E. Rustad, Scott W. Bailey, Emily S. Bernhardt, Charles T. Driscoll, Mark B. Green, Peter M. Groffman, et al. 2021. “Watershed Studies at the Hubbard Brook Experimental Forest: Building on a Long Legacy of Research With New Approaches and Sources of Data”. Hydrological Processes 35 (1). Wiley. doi:10.1002/hyp.14016.
Water column contributions to the metabolism and nutrient dynamics of mid-sized rivers
Reisinger, Alexander J., Jennifer L. Tank, Robert O. Hall, Emma J. Rosi, Michelle A. Baker, and Laurel Genzoli. 2021. “Water Column Contributions to the Metabolism and Nutrient Dynamics of Mid-Sized Rivers”. Biogeochemistry 153 (1). Springer Science and Business Media LLC: 67-84. doi:10.1007/s10533-021-00768-w.
Fate of Environmental Proteins (eProteins) from Genetically Engineered Crops in Streams is Controlled by Water pH and Ecosystem Metabolism
Brandão-Dias, Pedro F. P., Emma J. Rosi, Arial Shogren, Jennifer L. Tank, David T. Fischer, and Scott P. Egan. 2021. “Fate of Environmental Proteins (eProteins) from Genetically Engineered Crops in Streams Is Controlled by Water PH and Ecosystem Metabolism”. Environmental Science & Technology 55 (8). American Chemical Society (ACS): 4688-97. doi:10.1021/acs.est.0c05731.
Environmental concentrations of pharmaceuticals alter metabolism, denitrification, and diatom assemblages in artificial streams
Robson, Stephanie V., Emma J. Rosi, Erinn K. Richmond, and Michael Grace. 2020. “Environmental Concentrations of Pharmaceuticals Alter Metabolism, Denitrification, and Diatom Assemblages in Artificial Streams”. Freshwater Science 39 (2). University of Chicago Press: 256-67. doi:10.1086/708893.
Hydropeaking Operations of Two Run-of-River Mega-Dams Alter Downstream Hydrology of the Largest Amazon Tributary
Almeida, R. M., Stephen K. Hamilton, Emma J. Rosi, N. Barros, C. R. C. Doria, A. S. Flecker, A. S. Fleischmann, A. J. Reisinger, and F. Roland. (2025) 2020. “Hydropeaking Operations of Two Run-of-River Mega-Dams Alter Downstream Hydrology of the Largest Amazon Tributary”. Frontiers in Environmental Science 8.
Predicting high-frequency variation in stream solute concentrations with water quality sensors and machine learning
Green, M. B., L. H. Pardo, S. W. Bailey, J. L. Campbell, W. H. McDowell, E. S. Bernhardt, and Emma J. Rosi. 2020. “Predicting High-Frequency Variation in Stream Solute Concentrations With Water Quality Sensors and Machine Learning”. Hydrological Processes.
Nutrients and Pharmaceuticals Structure Bacterial Core Communities in Urban and Montane Stream Biofilms
Ogata, E. M., M. A. Baker, Emma J. Rosi, T. B. Smart, D. Long, and Z. T. Aanderud. (2025) 2020. “Nutrients and Pharmaceuticals Structure Bacterial Core Communities in Urban and Montane Stream Biofilms”. Frontiers in Microbiology 11.
Theoretical Perspectives of the Baltimore Ecosystem Study: Conceptual Evolution in a Social-Ecological Research Project
Pickett, Steward T. A., M. L. Cadenasso, M. E. Baker, L. E. Band, C. G. Boone, G. L. Buckley, Peter M. Groffman, et al. (2025) 2020. “Theoretical Perspectives of the Baltimore Ecosystem Study: Conceptual Evolution in a Social-Ecological Research Project”. Bioscience 70 (4): 297-314+.
Towards more realistic estimates of DOM decay in streams: Incubation methods, light, and non-additive effects
Kelso, Julia E., Emma J. Rosi, and Michelle A. Baker. 2020. “Towards More Realistic Estimates of DOM Decay in Streams: Incubation Methods, Light, and Non-Additive Effects”. Freshwater Science 39 (3). University of Chicago Press: 559-75. doi:10.1086/710218.
Urban ecology as an integrative science and practice.
Pickett, Steward T. A., Morgan Grove, Shannon L. LaDeau, Emma J. Rosi, and Mary L. Cadenasso. 2020. “Urban Ecology As an Integrative Science and Practice”. In Urban Ecology: Its Nature and Challenges, 122-43. CABI. doi:10.1079/9781789242607.0122.

Current Projects