The degradation of arsenoribosides from Ecklonia radiata tissues decomposed in natural and microbially manipulated microcosms

Bill MAHER, Simon FOSTER, Katarina Mikac

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    Abstract

    We investigated the influence of microbial communities on the degradation of arsenoribosides from E. radiata tissues decomposing in sand and seawater-based microcosms. During the first 30 days, arsenic was released from decomposing E. radiata tissues into seawater and sand porewaters in all microcosms. In microcosms containing autoclaved seawater and autoclaved sand, arsenic was shown to persist in soluble forms at concentrations (9–18 mg per microcosm) far higher than those present initially (,3 mg per microcosm). Arsenoribosides were lost from decomposing E. radiata tissues in all microcosms with previously established arsenoriboside degradation products, such as thio-arsenic species, dimethylarsinoylethanol (DMAE), dimethylarsenate (DMA) and arsenate (AsV) observed in all microcosms. DMAE and DMA persisted in the seawater and sand porewaters of microcosms containing autoclaved seawater and autoclaved sand. This suggests that the degradation step from arsenoribosides-DMAEoccurs on algal surfaces, whereas the step from DMAE-AsV occurs predominantly in the water-column or sand–sediments. This study also demonstrates that disruptions to microbial connectivity (defined as the ability of microbes to recolonise vacant habitats) result in alterations to arsenic cycling. Thus, the re-cycling of arsenoribosides released from marine macro-algae is driven by microbial complexity plus microbial connectivity rather than species diversity as such, as previously assumed.
    Original languageEnglish
    Pages (from-to)289-300
    Number of pages12
    JournalEnvironmental Chemistry
    Volume11
    Issue number3
    DOIs
    Publication statusPublished - 2014

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    Seawater
    microcosm
    Arsenic
    Sand
    Tissue
    Degradation
    degradation
    arsenic
    seawater
    sand
    Biodiversity
    connectivity
    Algae
    porewater
    Macros
    Recycling
    macroalga
    tissue
    arsenate
    Water

    Cite this

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    title = "The degradation of arsenoribosides from Ecklonia radiata tissues decomposed in natural and microbially manipulated microcosms",
    abstract = "We investigated the influence of microbial communities on the degradation of arsenoribosides from E. radiata tissues decomposing in sand and seawater-based microcosms. During the first 30 days, arsenic was released from decomposing E. radiata tissues into seawater and sand porewaters in all microcosms. In microcosms containing autoclaved seawater and autoclaved sand, arsenic was shown to persist in soluble forms at concentrations (9–18 mg per microcosm) far higher than those present initially (,3 mg per microcosm). Arsenoribosides were lost from decomposing E. radiata tissues in all microcosms with previously established arsenoriboside degradation products, such as thio-arsenic species, dimethylarsinoylethanol (DMAE), dimethylarsenate (DMA) and arsenate (AsV) observed in all microcosms. DMAE and DMA persisted in the seawater and sand porewaters of microcosms containing autoclaved seawater and autoclaved sand. This suggests that the degradation step from arsenoribosides-DMAEoccurs on algal surfaces, whereas the step from DMAE-AsV occurs predominantly in the water-column or sand–sediments. This study also demonstrates that disruptions to microbial connectivity (defined as the ability of microbes to recolonise vacant habitats) result in alterations to arsenic cycling. Thus, the re-cycling of arsenoribosides released from marine macro-algae is driven by microbial complexity plus microbial connectivity rather than species diversity as such, as previously assumed.",
    keywords = "algal decomposition, arsenic cycling, macro-algae, microbial ecology.",
    author = "Bill MAHER and Simon FOSTER and Katarina Mikac",
    year = "2014",
    doi = "10.1071/EN13155",
    language = "English",
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    pages = "289--300",
    journal = "Environmental Chemistry",
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    TY - JOUR

    T1 - The degradation of arsenoribosides from Ecklonia radiata tissues decomposed in natural and microbially manipulated microcosms

    AU - MAHER, Bill

    AU - FOSTER, Simon

    AU - Mikac, Katarina

    PY - 2014

    Y1 - 2014

    N2 - We investigated the influence of microbial communities on the degradation of arsenoribosides from E. radiata tissues decomposing in sand and seawater-based microcosms. During the first 30 days, arsenic was released from decomposing E. radiata tissues into seawater and sand porewaters in all microcosms. In microcosms containing autoclaved seawater and autoclaved sand, arsenic was shown to persist in soluble forms at concentrations (9–18 mg per microcosm) far higher than those present initially (,3 mg per microcosm). Arsenoribosides were lost from decomposing E. radiata tissues in all microcosms with previously established arsenoriboside degradation products, such as thio-arsenic species, dimethylarsinoylethanol (DMAE), dimethylarsenate (DMA) and arsenate (AsV) observed in all microcosms. DMAE and DMA persisted in the seawater and sand porewaters of microcosms containing autoclaved seawater and autoclaved sand. This suggests that the degradation step from arsenoribosides-DMAEoccurs on algal surfaces, whereas the step from DMAE-AsV occurs predominantly in the water-column or sand–sediments. This study also demonstrates that disruptions to microbial connectivity (defined as the ability of microbes to recolonise vacant habitats) result in alterations to arsenic cycling. Thus, the re-cycling of arsenoribosides released from marine macro-algae is driven by microbial complexity plus microbial connectivity rather than species diversity as such, as previously assumed.

    AB - We investigated the influence of microbial communities on the degradation of arsenoribosides from E. radiata tissues decomposing in sand and seawater-based microcosms. During the first 30 days, arsenic was released from decomposing E. radiata tissues into seawater and sand porewaters in all microcosms. In microcosms containing autoclaved seawater and autoclaved sand, arsenic was shown to persist in soluble forms at concentrations (9–18 mg per microcosm) far higher than those present initially (,3 mg per microcosm). Arsenoribosides were lost from decomposing E. radiata tissues in all microcosms with previously established arsenoriboside degradation products, such as thio-arsenic species, dimethylarsinoylethanol (DMAE), dimethylarsenate (DMA) and arsenate (AsV) observed in all microcosms. DMAE and DMA persisted in the seawater and sand porewaters of microcosms containing autoclaved seawater and autoclaved sand. This suggests that the degradation step from arsenoribosides-DMAEoccurs on algal surfaces, whereas the step from DMAE-AsV occurs predominantly in the water-column or sand–sediments. This study also demonstrates that disruptions to microbial connectivity (defined as the ability of microbes to recolonise vacant habitats) result in alterations to arsenic cycling. Thus, the re-cycling of arsenoribosides released from marine macro-algae is driven by microbial complexity plus microbial connectivity rather than species diversity as such, as previously assumed.

    KW - algal decomposition

    KW - arsenic cycling

    KW - macro-algae

    KW - microbial ecology.

    U2 - 10.1071/EN13155

    DO - 10.1071/EN13155

    M3 - Article

    VL - 11

    SP - 289

    EP - 300

    JO - Environmental Chemistry

    JF - Environmental Chemistry

    SN - 1448-2517

    IS - 3

    ER -