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Mapping the infestation of Sesbania punicea along the middle Sacramento River was the first step of a project to remove rattlebox in the Sacramento River ecosystem. This project is funded by a State Wildlife Grant, administered by the US Fish and Wildlife Service.

Mapping the infestation of Sesbania punicea along the middle Sacramento River was the first step of a project to remove rattlebox in the Sacramento River ecosystem. This project is funded by a State Wildlife Grant, administered by the US Fish and Wildlife Service.

Estuaries provide critical habitat for a vast array of fish and wildlife but are also a nexus for core economic activities that mobilize and concentrate contaminants that can threaten aquatic species. Selenium (Se), an essential element and potent reproductive toxin, is enriched in parts of the San Francisco Estuary (SFE) to levels known to cause toxicity, yet the risk of Se to species that inhabit the SFE is not well understood. We quantified Se concentrations in muscle, liver, and ovary of the demersal cyprinid Sacramento Splittail from six regions in the SFE at three time points (fall 2010-11, spring 2017) to evaluate Se exposure risk. Here we report fish morphological attributes, total selenium concentrations in fish boneless skinless muscle, liver, and ovary, as well as carbon, nitrogen and sulfur stable isotope values and elemental mass concentrations in fish muscle.

In response to the rapidly evolving conditions at the Salton Sea, with the emergence of both newly formed wetland habitat and increasing hazards to wildlife, the U.S. Bureau of Reclamation and U.S. Geological Survey have funded a re-evaluation of data gaps regarding selenium concentrations in biota the region. As part of this work, selenium concentrations in biological tissue samples were compiled from published reports, public databases, and unpublished archives into a tabulated spreadsheet. Since the California Department of Water Resources summarized selenium biological data in 2005, our compilation efforts focused on the 2005 through 2020 range. The resulting dataset encompasses all records available to us from 1984 to 2020, although we did not find any selenium records after 2017.

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