title: Geogenic metal mobility in a coastal inlet impacted by cannery discharge, Magdalena Bay, Baja California Sur, Mexico.
abstract: Magdalena Bay is an important habitat for marine organisms, some of which have been the subject of metal bioaccumulation studies. Cannery waste is discharged into the bay providing a plausible source of contamination but this study finds that some metals occur geogenically. Bay sediments and rocks (n=59) were analyzed for total metals and clustered (HCA) into two distinct groups with PCA indicating concentrations of Cr, Cu, Mn, and Ni influenced samples near ophiolite outcrops, which reported some metal concentrations exceeding averages in the crust by an order of magnitude (up to 4450ppm Cr and 1269ppm Ni). Metals at the cannery are rarely elevated above crustal averages except Zn (max. 160ppm), however, acid-extracted Zn was below recommended sediment quality guidelines in contrast to 80% of ophiolitic samples reporting Ni extractability exceeding such guidelines. This study raises awareness of geogenic metals when considering sources of contamination in marine environments.
authors.affiliation: Department of Environmental and Ocean Sciences, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, United States. Electronic address: bethoshea@sandiego.edu.
authors.forename: Beth
authors.initials: B
authors.lastname: O'Shea
authors.affiliation: Department of Environmental and Ocean Sciences, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, United States.
authors.forename: Christian
authors.initials: C
authors.lastname: Capistrano
authors.affiliation: Department of Environmental and Ocean Sciences, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, United States.
authors.forename: William
authors.initials: W
authors.lastname: Lee
mesh_terms: D061006:Bays; D004784:Environmental Monitoring; D019649:Food Industry; D019015:Geologic Sediments; D007220:Industrial Waste; D019216:Metals, Heavy; D008800:Mexico; D014874:Water Pollutants, Chemical
chemical_list: D007220:Industrial Waste; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical
keywords: Cannery; Chromium; Geogenic metals; Magdalena Bay; Nickel; Ophiolite