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).

Supplementary data for "Vreedzaam A, Ouboter P, Hindori-Mohangoo AD, Lepak R, Rumschlag S, Janssen S, Landburg G, Shankar A, Zijlmans W, Lichtveld MY, Wickliffe JK. Contrasting mercury contamination scenarios and site susceptibilities confound fish mercury burdens in Suriname, South America. Environ Pollut. 2023 Nov 1;336:122447. doi: 10.1016/j.envpol.2023.122447. Epub 2023 Aug 28. PMID: 37648055; PMCID: PMC10756560.". This dataset is associated with the following publication: 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, USA, 336: 122447, (2023).

These data represent Hg concentrations in tissue from 104 analyses of fish samples collected at 7 sites in streams/rivers and lakes during 2004 to 2013 within or near to Bad River Tribal lands. Nine fish species are represented in this dataset. Most fish specimens were collected by the Bad River Tribe, but collection agency was not always indicated in source files.

These data were collected as part of the Southwest Alaska Inventory and Monitoring Network (SWAN) freshwater contaminants protocol. The protocol outlines a framework for monitoring mercury (Hg) concentrations in resident lake fish within SWAN parks. The primary goal of this monitoring is to understand the spatial differences, temporal trends, and health ramifications of Hg contamination in resident lake fish. Monitoring relies on total Hg in fish axial muscle as an indicator of methyl Hg exposure. It targets four high-priority lakes which vary in size, depth, wetland cover, glacial influence, and Hg concentration. These lakes are in Katmai National Park and Preserve (KATM). The focal species is lake trout (Salvelinus namaycush), a widespread, long lived, top predator in SWAN lakes. However, if other species are sampled as bycatch, they may be retained and analyzed if they represent species-specific data gaps in Hg concentration. Two broad types of data are generated from this protocol. The first type includes observations and measurements that are recorded while sampling and processing fish (e.g., length, weight, sex). The second type includes results of analyses performed by contract laboratories (e.g., age, total Hg). This particular dataset includes those two broad types of data for 40 fish sampled in 2021. Of those fish, all 40 were lake trout.

Data were created in order to examine mercury concentrations, cycling, and biotic transfer in the Great Lakes and is in response to mercury concentrations in fish that are above consumption advisory levels. This dataset is associated with the following publication: 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, USA, 55(18): 12714-12723, (2021).

Primary and secondary consumers are important links in the trophic transfer of methylmercury, and their methylmercury concentrations are often measured to assess the potential risk of toxicity to higher trophic level consumers, including humans. A better understanding of the link between methylmercury production in sediments and methylmercury bioaccumulation in tidal marsh primary and secondary consumers will improve the design of contaminant monitoring, remediation, and restoration efforts, thereby protecting human and wildlife health. To advance this goal, we characterized spatial variation in sediment biogeochemistry and methylmercury concentrations of sediments, water, and consumer tissues at a meso-scale among marsh subhabitats. Methylmercury concentrations and stable isotope ratios were measured in 15 genera of tidal marsh primary and secondary consumers (Genera: Assiminea, Myostotella, Geukensia, Macoma, Traskorchestia, Bembidion, Pardosa, Palaemon, Hemigrapsus, Tridentiger, Acanthogobius, Gillichthys, Gambusia, Gasterosteus, and Cottus). Samples were collected in four subhabitats: marsh edges, marsh interiors, 1st order channels, and 3rd order channels during summer of 2006.

Mercury flux and fate (whether mercury was retained in the aquatic ecosystem or exported to the riparian ecosystem via blackfly emergence) was calculated based on animal consumption rates and total mercury concentration of diet items. Consumers and their gut contents were collected at six sites on the Colorado River in the Grand Canyon. Sites ranged from 0-367 river kilometers downstream of Lees Ferry (AZ, USA). Organic matter types and animal tissues were analyzed for total Hg using cold vapor atomic fluorescence (CVAF, Tekran Model 2600 CVAF spectrometer) following EPA Method 7474. Gut content samples used to calculate consumption rates were collected at least quarterly from July 1, 2007 to June 30, 2009. Organic matter types and consumers were collected June 12-28 2008. Data provided in this report include animal consumption rates; total mercury concentrations of food web samples and mean mercury concentrations of diet items; total mercury fluxes from diet items to individual consumers; the total amount of mercury in blackfly larvae that was consumed by fishes, excreted during metamorphosis, or exported via adult blackfly emergence; site locations and river widths; and the total flux of mercury at the scale of entire invertebrate and fish assemblages.

This data release includes results of raw water, soil, seston, and fish tissue samples collected from 14 lakes within Lake Clark National Park and Katmai National Park between 2007 and 2017. Specifically, these data include total mercury and methylmercury concentrations in water, size-sieved seston, and particulate matter. Additionally, these data include soil and volcanic ash measurements from the surrounding watersheds. Finally, these data include energetic profiling of seston, lake trout (Salvelinus namaycush), and sockeye salmon (Oncorhynchus nerka) as well as mercury isotope measurements of the fishes. These data, except for Lake Clark data, were use in interpreting mercury mass balance flows and bioavailability to the food web and are a part of an associated journal article published in Environmental Science and Technology Letters (https://doi.org/10.1021/acs.estlett.2c00096). Lake Clark data include mercury and methylmercury concentrations in water, seston, and fish tissue from 2011 and 2012. Mercury isotope measurements were not collected as part of this assessment. These data were used to understand drivers of bioaccumulation within predator fish from southwest Alaska and are part of an associated journal article published in Environmental Pollution (https://doi.org/10.1016/j.envpol.2023.121678).

This data release includes results of raw water, soil, seston, and fish tissue samples collected from 14 lakes within Lake Clark National Park and Katmai National Park between 2007 and 2017. Specifically, these data include total mercury and methylmercury concentrations in water, size-sieved seston, and particulate matter. Additionally, these data include soil and volcanic ash measurements from the surrounding watersheds. Finally, these data include energetic profiling of seston, lake trout (Salvelinus namaycush), and sockeye salmon (Oncorhynchus nerka) as well as mercury isotope measurements of the fishes. These data, except for Lake Clark data, were use in interpreting mercury mass balance flows and bioavailability to the food web and are a part of an associated journal article published in Environmental Science and Technology Letters (https://doi.org/10.1021/acs.estlett.2c00096). Lake Clark data include mercury and methylmercury concentrations in water, seston, and fish tissue from 2011 and 2012. Mercury isotope measurements were not collected as part of this assessment. These data were used to understand drivers of bioaccumulation within predator fish from southwest Alaska and are part of an associated journal article published in Environmental Pollution (https://doi.org/10.1016/j.envpol.2023.121678).