Arsenic Species in a Rocky Intertidal marine food chain in NSW, Australia, revisited

Simon Foster, Bill Maher, Ernst Schmeisser, Simon Apte, Anne Taylor, Frank Krikowa

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    37 Citations (Scopus)

    Abstract

    The present study reports total arsenic and arsenic species in a short rocky intertidal marine food chain in NSW, Australia. Total mean arsenic concentrations increased up the food chain in the following order: 4 ± 2 μg g?1 in attached rock microalgae, 31 ± 14 μg g ?1 in Bembicium nanum Lamarck, 45 ± 14 μg g?1 in Cellana tramoserica Sowerby, 58 ± 14 μg g?1 in Nerita atramentosa Reeve, 75 ± 15 μg g?1 in Austrocochlea constrica Lamarck (a herbivore) and 476 ± 285 μg g?1 in the carnivore Morula marginalba Blainville. Significant differences in arsenic concentrations of B. nanum, N. atramentosa and M. marginalba were found among locations and may be related to food availability, spawning or differences in age and/or size classes of individuals. Significant differences in arsenic concentrations were also found within locations among species, and increased in the order: rock microalgae < B. nanum < C. tramoserica < N. atramentosa < A. constricta < M. marginalba. Although small differences in total arsenic concentrations were found among locations for some gastropod species, arsenic species proportions were very consistent within gastropod species across locations. The majority of arsenic in Homosira banksii (macroalgae) was oxo-arsenoribosides, with thio-arsenoribosides making up ∼10% of the total methanol?water extractable arsenic. The rock microalgae contained arsenobetaine (AB) (59 ± 5%) and arsenoribosides (36 ± 15%). The AB content of the herbivores B. nanum, N. atramentosa and A. constricta ranged from 71 to 95%, and that of the carnivore M. marginalba was 98%. Most gastropods contained thio-arsenosugars (up to 13 ± 3% of total extractable arsenic), with C. tramoserica containing higher proportions of thio-phosphate arsenoriboside (7 ± 2%) and lower proportions of AB (69 ± 4%). Glycerol trimethylarsonioribosides (1.4 ± 0.1%) were also found in most of the herbivorous gastropods. Oxo-dimethylarsinoylethanol (oxo-DMAE) was found in N. atramentosa (<1%)
    Original languageEnglish
    Pages (from-to)304-315
    Number of pages12
    JournalEnvironmental Chemistry
    Volume3
    Issue number4
    DOIs
    Publication statusPublished - 2006

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