Birds (Clark’s grebe, Aechmophorus clarkii; Forster’s Tern, Sterna forsteri), fish (Peacock bass, Cichla temensis, Cichla monoculus; Pescada, Plagioscion squamosissimus) and earthworms were analyzed for selenium, total mercury, and methyl mercury concentration and mercury speciation. A Clark’s grebe was collected from Lake Berryessa (California, United States) in September 2012. A Forster’s Tern was collected from the San Francisco Bay Estuary (California, United States) in June 2018. Bird necropsies were performed at the U.S. Geological Survey (Dixon, CA) to obtain the following tissues: head feather, breast feather, brain, skeletal muscle, kidney, and liver. Fishes were collected in September 2018 from the Tapajós...
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