J
Jacob A. Fleck
Researcher at United States Geological Survey
Publications - 35
Citations - 1992
Jacob A. Fleck is an academic researcher from United States Geological Survey. The author has contributed to research in topics: Mercury (element) & Dissolved organic carbon. The author has an hindex of 20, co-authored 35 publications receiving 1621 citations. Previous affiliations of Jacob A. Fleck include California State University.
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Journal ArticleDOI
Optical properties of dissolved organic matter (DOM): Effects of biological and photolytic degradation
Angela M. Hansen,Tamara E.C. Kraus,Brian A. Pellerin,Jacob A. Fleck,Bryan D. Downing,Brian A. Bergamaschi +5 more
TL;DR: In this article, the authors measured changes in commonly used optical properties and indices in DOM leached from peat soil, plants, and algae following biological and photochemical degradation to determine whether they provide unique signatures that can be linked to original DOM source.
Journal ArticleDOI
Alteration of soil microbial communities and water quality in restored wetlands
TL;DR: In this paper, an aeration gradient was defined as the predominant determinant of active microbial communities across soil types and land usage in permanently flooded wetlands, such as those created by wetland restoration on Sacramento-San Joaquin Delta islands in California.
Journal ArticleDOI
Spatial and temporal patterns of mercury concentrations in freshwater fish across the Western United States and Canada.
Collin A. Eagles-Smith,Joshua T. Ackerman,James J. Willacker,Michael T. Tate,Michelle A. Lutz,Jacob A. Fleck,A. Robin Stewart,James G. Wiener,David C. Evers,Jesse M. Lepak,Jay A Davis,Colleen Flanagan Pritz +11 more
TL;DR: It is suggested that fish mercury exposure is widespread throughout Western US and Canada, and that species, habitat type, and region play an important role in influencing ecological risk of mercury in aquatic ecosystems.
Journal ArticleDOI
Mercury in western North America: A synthesis of environmental contamination, fluxes, bioaccumulation, and risk to fish and wildlife.
Collin A. Eagles-Smith,James G. Wiener,Chris S. Eckley,James J. Willacker,David C. Evers,Mark Marvin-DiPasquale,Daniel Obrist,Jacob A. Fleck,George R. Aiken,Jesse M. Lepak,Allyson K. Jackson,Jackson P. Webster,A. Robin Stewart,Jay A Davis,Charles N. Alpers,Joshua T. Ackerman +15 more
TL;DR: Together the findings indicate that developing efforts to control MeHg production in the West may be particularly beneficial for reducing food web exposure instead of efforts to simply control inorganic Hg sources.
Journal ArticleDOI
Quantifying fluxes and characterizing compositional changes of dissolved organic matter in aquatic systems in situ using combined acoustic and optical measurements
Bryan D. Downing,Emmanuel Boss,Brian A. Bergamaschi,Jacob A. Fleck,Megan A. Lionberger,Neil K. Ganju,David H. Schoellhamer,Roger Fujii +7 more
TL;DR: In this article, the authors used coupled optical and acoustic measurements that provide robust quantitative estimates of concentrations and constituent characteristics needed to investigate processes and calculate fluxes of dissolved organic matter (DOM) in tidal and other lotic environments.