Distribution of arsenic species in an open seagrass ecosystem: relationship to trophic groups, habitats and feeding zones

Amina Price, William Maher, Jason King KIRBY, Elliott DUNCAN, Anne Taylor, Jaimie Potts

    Research output: Contribution to journalArticle

    20 Citations (Scopus)

    Abstract

    The distribution and speciation of arsenic within an open marine seagrass ecosystem in Lake Macquarie, NSW, Australia is described. Twenty-six estuarine species were collected from five trophic groups (autotrophs, suspension-feeders, herbivores, detritivores and omnivores, and carnivores). Sediment, detritus, epibiota and microinvertebrates were also collected and were classified as arsenic source samples. There were no significant differences in arsenic concentrations between trophic groups and between pelagic and benthic feeders. Benthic-dwelling species generally contained higher arsenic concentrations than pelagic-dwelling species. Sediments, seagrass blades and detritus contained mostly inorganic arsenic (50-90 %) and arsenoribosides (10-26 %), with some methylarsonate (9.4-14.6 %) and dimethyarsinate (7.9-9.7 %) in seagrass blades and detritus. Macroalgae contained mostly arsenoribosides (40-100 %). Epibiota and other animals contained predominately arsenobetaine (63-100 %) and varying amounts of dimethyarsinate (0-26 %), monomethyarsonate (0-14.6 %), inorganic arsenic (0-2 %), trimethylarsenic oxide (0-6.6 %), arsenocholine (0-12 %) and tetramethylarsonium ion (0-4.5 %). It was concluded that arsenic concentrations and species within the organisms of the Lake Macquarie ecosystem are species-specific and determined by a variety of factors including exposure, diet and the physiology of the organisms.
    Original languageEnglish
    Pages (from-to)77-88
    Number of pages12
    JournalEnvironmental Chemistry
    Volume9
    Issue number1
    DOIs
    Publication statusPublished - 2012

    Fingerprint Dive into the research topics of 'Distribution of arsenic species in an open seagrass ecosystem: relationship to trophic groups, habitats and feeding zones'. Together they form a unique fingerprint.

    Cite this