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Biogeochemical patterns in prey species reveal complex mercury exposure pathways from the environment to Aleutian Steller sea lions.
Mar Pollut Bull
December 2024
Department of Biology and Wildlife, University of Alaska Fairbanks, 2090 Koyukuk Dr, Fairbanks, AK 99775, USA; Institute of Arctic Biology, University of Alaska Fairbanks, 2140 Koyukuk Dr, Fairbank, AK 99775, USA.
Several wildlife species exhibit marked spatial variation in toxicologically relevant tissue concentrations of mercury across the Aleutian Islands of Alaska, most notably the endangered Steller sea lion (Eumetopias jubatus). To unravel potential environmental and trophic pathways driving mercury variation in this species of concern, we investigated spatiotemporal and ecological patterns in total mercury concentrations and stable isotope ratios of carbon and nitrogen from muscle tissues of twelve mid-trophic level prey species of the region (n = 1461). Dividing samples into island groups explained biogeochemical variation better than larger spatial resolutions, with Amchitka Pass and Buldir Pass acting as strong geographic break points.
View Article and Find Full Text PDFMercury isotopes in eclogites constrain the sources and fates of mercury during oceanic subduction and continental collision.
Sci Bull (Beijing)
December 2024
State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China. Electronic address:
Trophic magnification rates of eighteen trace elements in freshwater food webs.
Sci Total Environ
December 2024
Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, Saskatchewan S7N 5B3, Canada; School of Environment and Sustainability, University of Saskatchewan, 117 Science Place, Saskatoon, Saskatchewan S7N 5C8, Canada. Electronic address:
Trace elements play diverse roles in animal physiology ranging from essential micronutrients to potent toxicants. Despite animals accumulating many trace elements through their diets, relationships between trophic positions and biological concentrations of most trace elements remain poorly described. We report trophic transfer rates of Al, As, Ba, Cd, Co, Cu, Fe, Hg, Mn, Ni, Pb, Se, Sr, Ti, Tl, U, V, and Zn from 31 freshwaters located in distinct biogeographic regions.
View Article and Find Full Text PDFMercury speciation and stable isotopes in emperor penguins: First evidence for biochemical demethylation of methylmercury to mercury-dithiolate and mercury-tetraselenolate complexes.
J Hazard Mater
November 2024
Department of Environmental Toxicology, University of California Davis, Davis, CA 95616, USA.
Apex marine predators, such as toothed whales and large petrels and albatrosses, ingest mercury (Hg) primarily in the form of methylmercury (MeHg) via prey consumption, which they detoxify as tiemannite (HgSe). However, it remains unclear how lower trophic level marine predators, termed mesopredators, with elevated Hg concentrations detoxify MeHg and what chemical species are formed. To address this need, we used high energy-resolution X-ray absorption near edge structure spectroscopy paired with nitrogen (N) and Hg stable isotopes to identify the chemical forms of Hg, Hg sources, and species-specific δHg isotopic values in emperor penguin, a mesopredator feeding primarily on Antarctic silverfish.
View Article and Find Full Text PDFQuantifying Altitudinal Mercury Accumulation in Biomonitors along Himalayan Valleys Using Mercury Isotopes.
Environ Sci Technol
December 2024
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
Article Synopsis
- The Himalayan valleys serve as key pathways for transporting atmospheric pollutants, including mercury (Hg), from South Asia to the Tibetan Plateau.
- This study uses biomonitors like tree foliage, bark, mosses, and lichens to analyze the sources and buildup of mercury in these regions.
- Findings indicate variations in mercury concentrations and isotopic compositions among the biomonitors, with most Hg stemming from atmospheric sources linked to human activities in South Asia.
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