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Lepak, R., S. Janssen, J. Ogorek, C. Dillman, J. Hoffman, M. Tate, AND P. McIntyre. Can Preserved Museum Specimens Be Used to Reconstruct Fish Mercury Burden and Sources through Time? Environmental Science & Technology Letters. American Chemical Society, Washington, DC, 10(2):165-171, (2023). https://doi.org/10.1021/acs.estlett.3c00009

Vreedzaam, A., P. Ouboter, A. Hindori-Mohangoo, R. Lepak, S. Rumschlag, S. Janssen, G. Landburg, A. Shankar, W. Zijlmans, M. Lichtveld, AND J. Wickliffe. Contrasting mercury contamination scenarios and site susceptibilities confound fish mercury burdens in Suriname, South America. ENVIRONMENTAL POLLUTION. Elsevier Science Ltd, New York, NY, 336:122447, (2023). https://doi.org/10.1016/j.envpol.2023.122447

Keeton, K., J. Hoffman, R. Lepak, J. Gerads, A. Banerji, AND A. Opseth. Lake Michigan 2021 CSMI Lower Food Web Summary. CSMI Lake Michigan Report Out Session 2, NA, NC, February 22, 2023. https://doi.org/10.23645/epacomptox.24601863

Bart, H., A. Besserr, R. Bowes, K. Capps, E. DeArmon, C. Dillman, K. Driscoll, A. Dugger, G. Hamilton, P. Harris, D. Hendrickson, J. Hoffman, J. Knouft, R. Lepak, H. Lopez-Fernandez, F. McCormick, C. Montaña, S. Newsome, A. Pease, W. Smith, C. Taylor, T. Turner, AND R. Welicky. Long-term ecological research in freshwaters enabled by regional biodiversity collections, stable isotope analysis, and environmental informatics. BIOSCIENCE. American Institute of Biological Sciences, MCLEAN, VA, 73(7):1-15, (2023). https://doi.org/10.1093/biosci/biad039

Tate, M., S. Janssen, R. Lepak, L. Fluke, AND D. Krabbenhoft. National-scale assessment of total gaseous mercury isotopes across the United States. JOURNAL OF GEOPHYSICAL RESEARCH: ATMOSPHERES. American Geophysical Union, Washington, DC, 128(8):N/A, (2023). https://doi.org/10.1029/2022JD038276

Balgooyen, S., B. Blackwell, AND R. Lepak. PFAS in Great Lakes Fish: Spatial and Temporal Trends. Great Lakes Fish Health Committee, NA, MN, January 31, 2023. https://doi.org/10.23645/epacomptox.21989573

Hanson, J., J. Hoffman, C. Goldsworthy, N. Peterson, T. Hrabik, V. Brady, R. Lepak, AND M. Gordon. Trophic Niche Overlap Of Lake Superior Nearshore Fishes. Minnesota Chapter of the American Fisheries Society, St. Cloud, MN, January 31 - February 02, 2023. https://doi.org/10.23645/epacomptox.22280740

Bartz, K., M. Hannam, T. Wilson, R. Lepak, J. Ogorek, D. Young, C. Eagles-Smith, AND D. Krabbenhoft. Understanding drivers of mercury in lake trout (Salvelinus namaycush), a top-predator fish in southwest Alaska’s parklands. ENVIRONMENTAL POLLUTION. Elsevier Science Ltd, New York, NY, 330:121678, (2023). https://doi.org/10.1016/j.envpol.2023.121678

Lepak, R., S. Janssen, J. Hoffman, C. Yarnes, J. Ogorek, M. Tate, C. Dillman, AND P. McIntyre. Leveraging Museum-Preserved Fishes for Understanding Spatiotemporal Changes in Mercury Sources from Aquatic Ecosystems. 2022 Joint Meeting of Ichthyologists and Herpetologists, Spokane, WA, July 27 - 31, 2022. https://doi.org/10.23645/epacomptox.20493054

Lepak, R., S. Janssen, J. Hoffman, M. Gordon, C. Yarnes, J. Ogorek, M. Tate, AND T. Rosera. Reconstructing Mercury Trends in Great Lakes Gamefish That Are Complicated by Physical, Biological and Chemical Stressors. 2022 Joint Meeting of Ichthyologists and Herpetologists, Spokane, WA, July 27 - 31, 2022. https://doi.org/10.23645/epacomptox.20492988

Lepak, R., J. Ogorek, K. Bartz, S. Janssen, M. Tate, Y. Runsheng, J. Hurley, D. Young, C. Eagles-Smith, AND D. Krabbenhoft. Using Carbon, Nitrogen, and Mercury Isotope Values to Distinguish Mercury Sources to Alaskan Lake Trout. Environmental Science & Technology Letters. American Chemical Society, Washington, DC, 9(4):312-319, (2022). https://doi.org/10.1021/acs.estlett.2c00096

Lepak, R., M. Tate, J. Ogorek, J. DeWild, J. Hurley, AND D. Krabbenhoft. Aqueous Elemental Mercury Production versus Mercury Inventories in the Lake Michigan Airshed: Deciphering the Spatial and Diel Controls of Mercury Gradients in Air and Water. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 3(1):719-727, (2021).

Gerads, J., D. Bolgrien, A. Cotter, S. Miller, R. Lepak, J. Hoffman, AND A. Banerji. EPA ORD GLTED 2021 Lake Michigan CSMI Sampling. Cooperative Science and Monitoring Initiative (CSMI) Lake Michigan 2021 Data Roundup, Virtual, Michigan, December 10, 2021. https://doi.org/10.23645/epacomptox.18709925

Ogorek, J., R. Lepak, J. Hoffman, J. DeWild, T. Rosera, M. Tate, J. Hurley, AND D. Krabbenhoft. Enhanced sensitivity of methylmercury bioaccumulation into seston of the Laurentian Great Lakes. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 55(18):12714-12723, (2021). https://doi.org/10.1021/acs.est.1c02319

Janssen, S., J. Hoffman, R. Lepak, D. Krabbenhoft, D. Walters, C. Eagles-Smith, G. Peterson, J. Ogorek, J. DeWild, A. Cotter, M. Pearson, M. Tate, R. Yeardley, AND M. Mills. Examining historical mercury sources in the St. Louis River estuary: How legacy contamination influences biological mercury levels in Great Lakes coastal regions. SCIENCE OF THE TOTAL ENVIRONMENT. Elsevier BV, AMSTERDAM, Netherlands, 779:146284, (2021). https://doi.org/10.1016/j.scitotenv.2021.146284

Lepak, R., B. Blackwell, J. Hoffman, A. Cotter, M. Gordon, Dan Villeneuve, AND G. Ankley. Food web energy transfer in Lake Superior to support contaminant research. Twin Ports Freshwater Folks online Webinar, Duluth, MN, September 01, 2021. https://doi.org/10.23645/epacomptox.17108087

Lepak, R., J. Hoffman, S. Janssen, M. Gordon, M. Tate, J. Ogorek, D. Krabbenhoft, E. Murphy, J. Hurley, AND A. Cotter. Reconstructing the energy pathways and contaminant burden to lake trout in contrasting Great Lakes. International Association of Great Lakes Research (IAGLR) Virtual Conference, Duluth, MN, May 17 - 21, 2021. https://doi.org/10.23645/epacomptox.14785365

Hoffman, J., S. Janssen, G. Peterson, R. Lepak, M. Pearson, A. Cotter, AND D. Krabbenhoft. Tracing mercury sources through a Great Lakes coastal wetland food web using a multi-stable isotope approach. International Association of Great Lakes Research (IAGLR) Virtual Conference, Duluth, MN, May 17 - 21, 2021. https://doi.org/10.23645/epacomptox.14757969

Hoffman, J., S. Janssen, R. Lepak, M. Pearson, A. Cotter, AND D. Krabbenhoft. A multiple stable isotope approach to determine how fish life-history effects mercury bioaccumulation. SETAC North America, Fort Worth, TX, November 15 - 19, 2020.

Peterson, B., E. McDaniel, A. Schmidt, R. Lepak, S. Janssen, P. Tran, R. Marick, J. Ogorek, J. DeWild, D. Krabbenhoft, AND K. McMahon. Mercury methylation trait dispersed across diverse anaerobic microbial guilds in a eutrophic sulfate-enriched lake. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 54(24):15840–15851, (2020). https://doi.org/10.1101/2020.04.01.018762

Lepak, R., S. Jannsen, D. Krabbenhoft, J. Ogorek, J. DeWild, M. Tate, J. Hurley, C. Babiarz, R. Yin, E. Murphy, AND D. Engstrom. Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan. MN American Fisheries Society Meeting, Willmar, MN, February 10-12, 2020, Willmar, MN, February 10 - 12, 2020. https://doi.org/10.23645/epacomptox.11766783

Lepak, R., S. Jannsen, D. Krabbenhoft, M. Tate, J. Hurley, R. Yin, D. Engstrom, W. Fitzgerald, AND S. Nagorski. Resolving atmospheric mercury loading and source trends from isotopic records of remote North American lake sediments. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 54(15):9325-9333, (2020). https://doi.org/10.1021/acs.est.0c00579

Lepak, R., J. Hoffman, S. Jannsen, M. Gordon, M. Tate, J. Ogorek, D. Krabbenhoft, E. Murphy, J. Hurley, AND A. Cotter. The historical reconstruction of energy pathways and contaminant accumulation in Lake Trout between two contrasting Great Lakes: Superior and Michigan. Presented at SETAC North America, Fort Worth, TX, November 15 - 19, 2020. https://doi.org/10.23645/epacomptox.13235021

Janssen, S., J. Hoffman, G. Peterson, M. Pearson, R. Lepak, A. Cotter, AND D. Krabbenhoft. Understanding Sources and Cycling of Mercury in the St Louis River using Stable Isotope Approaches. SETAC North America, Fort Worth, TX, November 15 - 19, 2020. https://doi.org/10.23645/epacomptox.13171757

Janssen, S., J. Hoffman, G. Peterson, R. Lepak, M. Pearson, A. Cotter, AND D. Krabbenhoft. Understanding sources and cycling of mercury in the St. Louis River using stable isotope approaches. St Louis River Summit, Duluth, MN, March 03 - 04, 2020. https://doi.org/10.23645/epacomptox.11923401