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Arsenic speciation in food chains from mid-Atlantic hydrothermal vents

January 1, 2012

Arsenic concentration and speciation were determined in benthic fauna collected from the Mid-Atlantic Ridge hydrothermal vents. The shrimp species, Rimicaris exoculata, the vent chimney-dwelling mussel, Bathymodiolus azoricus, Branchipolynoe seepensis, a commensal worm of B. azoricus and the gastropod Peltospira smaragdina showed variations in As concentration and in stable isotope (δ13C and δ15N) signature between species, suggesting different sources of As uptake. Arsenic speciation showed arsenobetaine to be the dominant species in R. exoculata, whereas in B. azoricus and B. seepensis arsenosugars were most abundant, although arsenobetaine, dimethylarsinate and inorganic arsenic were also observed, along with several unidentified species. Scrape samples from outside the vent chimneys covered with microbial mat, which is a presumed food source for many vent organisms, contained high levels of total As, but organic species were not detectable. The formation of arsenosugars in pelagic environments is typically attributed to marine algae, and the pathway to arsenobetaine is still unknown. The occurrence of arsenosugars and arsenobetaine in these deep sea organisms, where primary production is chemolithoautotrophic and stable isotope analyses indicate food sources are of vent origin, suggests that organic arsenicals can occur in a foodweb without algae or other photosynthetic life.

Publication Year 2012
Title Arsenic speciation in food chains from mid-Atlantic hydrothermal vents
DOI 10.1071/EN11134
Authors Vivien F. Taylor, Brian P. Jackson, Matthew R. Siegfried, Jana Navratilova, Kevin A. Francesconi, Julie Kirshtein, Mary Voytek
Publication Type Article
Publication Subtype Journal Article
Series Title Environmental Chemistry
Index ID 70043449
Record Source USGS Publications Warehouse
USGS Organization Branch of Regional Research-Eastern Region