Publications by authors named "Michelle P Trifari"

Total mercury concentrations ([THg]) exceed thresholds of concern in some Steller sea lion (Eumetopias jubatus) tissues from certain portions of the Aleutian Islands, Alaska. We applied compound-specific stable isotope analyses of both carbon and nitrogen in amino acids from fish muscle tissue to quantify the proportional contributions of primary production sources and trophic positions of eight prey species (n = 474 total) that are part of Steller sea lion diets. Previous THg analyses of fish muscle, coupled with monomethylmercury analyses of a subset of samples, substantiated previous findings that fishes from the west of Amchitka Pass, a discrete oceanographic boundary of the Aleutian Archipelago, have higher muscle Hg concentrations relative to fishes from the east.

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Article Synopsis
  • A proposed mine in Alaska's Bristol Bay watershed raises concerns about how copper (Cu) contamination could affect Pacific salmon species, such as sockeye, Chinook, and coho.
  • Researchers conducted experiments to determine the acute lethal toxicity of Cu to these salmon fry under realistic water conditions and evaluated different models for calculating safe Cu levels.
  • The study found that all models predicted safe Cu concentrations well above lethal levels, with coho salmon being the most sensitive, and emphasized the need for site-specific assessments to improve copper risk evaluations for Pacific salmon.
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