EPA Data presented in the manuscript. This dataset is associated with the following publication: Lentz, D.L., T.L. Hamilton, N.P. Dunning, V.L. Scarborough, T.P. Luxton, A. Vonderheide, E.J. Tepe, C.J. Perfetta, J. Brunemann, L. Grazioso, F. Valdez, K.B. Tankersley, and A.A. Weiss. Molecular genetic and geochemical assays reveal severe contamination of drinking water reservoirs at the ancient Maya city of Tikal. Scientific Reports. Nature Publishing Group, London, UK, 10316, (2020).

The data represent a shallow mercury chronology using sediment core from a playa lake system situated in a high-altitude setting in northwest Argentina. Archive samples were used from sediment core (LP07-1A) that was collected from a location (lat -22.362100°, lon -66.003600°) in the center of the playa-lake Laguna de Pozuelos in the dry season of 2007, when the water level was 2 to 3 cm. The samples were taken over 1 to 2 cm intervals and had been dried and homogenized. Sediment total mercury analyses were conducted by digesting sediment (0.30 g) in boiling concentrated nitric/sulfuric acid (ratio 3:1), followed by 12 hour oxidation with bromine monochloride, tin chloride reduction, gold amalgamation, and detection by CVAFS.

Data used to generate Figures 2, 3, and 4 as we ll as Table 3. This dataset is associated with the following publication: Banerji, A., M. Bagley, J. Shoemaker, D. Tettenhorst, C. Nietch, J. Allen, and J. Santodomingo. Evaluating putative ecological drivers of microcystin spatiotemporal dynamics using metabarcoding and environmental data. Harmful Algae. Elsevier B.V., Amsterdam, NETHERLANDS, 86: 84-95, (2019).

Data used to create figures in the manuscript. This dataset is associated with the following publication: Eckley, C.S., T.P. Luxton, B. Stanfield, A. Baldwin, J. Holloway, J. McKernan, and M.G. Johnson. Effect of organic matter concentration and characteristics on mercury mobilization and methylmercury production at an abandoned mine site. ENVIRONMENTAL POLLUTION. Elsevier Science Ltd, New York, NY, USA, 271: 116369, (2021).

These hydrology, circulation and water chemistry data were collected in Gulf of Mexico. Data collected as part of Continental Shelf Circulation, Biloxi Bay Hydrology, and St. Louis Bay Hydrology projects was submitted on three diskettes which accompanied three publications by Dr. Charles K. Eleuterius. These publications which are cited below are held by the NOAA Central Library, Silver Spring, Maryland. (1) Circulation on the Continental Shelf Between 87 Deg W and 90 Deg W with Data Appendix Charles K. Eleuterius, Ph.D. and G. Alan Criss August 1994 Final Report, Volume 1 University of Southern Mississippi, Gulf Coast Research Laboratory Physical Oceanography prepared for the Mineral Management Service, USDI 55 pp. (2) Biloxi Bay Hydrology and Selected Chemistry with Data Appendix Charles K. Eleuterius, Ph.D. and G. Alan Criss August 1994 Final Report, Volume 2 University of Southern Mississippi, Gulf Coast Research Laboratory Physical Oceanography prepared for the Minerals Management Service, USDI 15 pp. (3) St. Louis Bay Hydrography and Selected Chemistry with Data Appendix Charles K. Eleuterius, Ph.D. and G. Alan Criss August 1994 Final Report, Volume 3 University of Southern Mississippi, Gulf Coast Research Laboratory Physical Oceanography prepared for the Minerals Management Service, USDI 15 pp.

The dataset contains the raw data used for the correlation analyses. This dataset is associated with the following publications: Schaeffer, B., J. SantoDomingo, and B. Kreakie. SSWR 4.3 Tools for HABs Risk Characterization and Assessment FY20 Report. U.S. Environmental Protection Agency, Washington, DC, USA. Chaffin, J., J. Bratton, E. Verhamme, H. Bair, A. Beecher, C. Binding, J. Birbeck, T. Bridgeman, X. Chang, J. Crossman, W. Currie, T. Davis, G. Dick, K. Drouillard, R. Errera, T. Frenken, H. MacIsaac, A. McClure, R.M. McKay, L. Reitz, J. SantoDomingo, K. Stanislaawczyk, R. Stumpf, Z. Swan, B. Synder, J. Westrick, P. Xue, C. Yancey, A. Zastepa, and X. Zhou. The Lake Erie HABs Grab: A binational collaboration to characterize the western basin cyanobacterial harmful algal blooms at an unprecedented high-resolution spatial scale. Harmful Algae. Elsevier B.V., Amsterdam, NETHERLANDS, 108: 102080, (2021).

Metadata. This dataset is associated with the following publication: Jesus Eulisis, C., M.d.C. Gonzalez-Chavez, R. Carrillo-Gonzalez, K. Scheckel, D. Tapia Maruri, and J. Garcia Cue. Metal(loid) bioaccessibility of atmospheric particulate matter from mine tailings at Zimapan, Mexico. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH. Ecomed Verlagsgesellschaft AG, Landsberg, GERMANY, 28: 19458-19472, (2021).

Metadata. This dataset is associated with the following publication: Jesus Eulisis, C., M.d.C. Gonzalez-Chavez, R. Carrillo-Gonzalez, K. Scheckel, D. Tapia Maruri, and J. Garcia Cue. Metal(loid) bioaccessibility of atmospheric particulate matter from mine tailings at Zimapan, Mexico. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH. Ecomed Verlagsgesellschaft AG, Landsberg, GERMANY, 28: 19458-19472, (2021).

Metadata. This dataset is associated with the following publication: Jesus Eulisis, C., M.d.C. Gonzalez-Chavez, R. Carrillo-Gonzalez, J.L. Garcia-Cue, D. Fernandez-Reynoso, M. Noerpel, and K. Scheckel. Bioaccessibility of potentially toxic elements in mine residue particles. Environmental Science: Processes & Impacts. RSC Publishing, Cambridge, UK, 23(2): 367-380, (2021).

mercury concentrations determined in fish tissue samples collected from the Penobscot River, Maine. This dataset is associated with the following publication: Melnyk, L., J. Lin, D. Kusnierz, K. Pugh, J. Durant, R. Suarez-Soto, R. Venkatapathy, D. Sundaravadivelu, A. Morris, J. Lazorchak, G. Perlman, and M. Stover. Risks from mercury in anadromous fish collected from Penobscot River, Maine. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, USA, 781: 146691, (2021).