Total arsenic concentrations and arsenic species present in naturally decomposing Ecklonia radiata tissues collected from various marine habitats

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    Abstract

    To investigate the release and degradation of arsenoribosides associated with the brown alga Ecklonia radiata, tissues were collected in various marine microhabitats (water column, sand intertidal, and rock platform intertidal) to establish the importance of decomposition stage and the micro-habitat in which decomposition occurs on arsenoriboside degradation. Total arsenic concentrations in E. radiata tissues varied in a similar pattern across all three sampling locations (Lake Tabourie, Burrill Lake, and Ulladulla Harbour) with concentrations in live tissues (53–124 µg As g-1 (dry mass)) greater than concentrations in tissues decomposing in the water column (28–90 µg As g-1 (dry mass)), which were in turn higher than concentrations in tissues decomposing in intertidal environments (16– 21 µg As g-1 (dry mass)). Arsenoribosides, specifically sulfonate (SO3-), phosphate (PO4-), and glycerol (Gly-) accounted for all of the arsenic extracted from live E. radiata tissues. Arsenoribosides also accounted for 100 % of the extractable arsenic species in E. radiata tissues decomposing in the water column. The proportions of arsenic species in decomposing E. radiata tissue from intertidal environments varied with sampling location and therefore micro-habitat. In rock platform-based intertidal zones (Burrill Lake and Ulladulla harbour), considerable concentrations of unextractable arsenic (10–60 %) were present plus known arsenoriboside degradation products such as dimethylarsinoylethanol (DMAE), dimethylarsenate (DMA), and arsenate (As(V)). In sand/beach-based intertidal zones, however, the vast majority of arsenic (˜95 %) was unextractable with only small concentrations of arsenoribosides and As(V) present. This study demonstrates that the release and further degradation of arsenoribosides from E. radiata tissues occurs in a two-step process with arsenoribosides released via leaching, whilst E. radiata remains suspended within the water column. Arsenoribosides are then degraded to various intermediate arsenic species once E. radiata tissues settle on intertidal environments; however, the degree of degradation varies relative to whether decomposition occurs on rock platform or sand-based environments. These results illustrate the key role of marine micro- habitats in the degradation of arsenoribosides contained within marine macro-algae.
    Original languageEnglish
    Pages (from-to)2193-2201
    Number of pages9
    JournalJournal of Applied Phycology
    Volume26
    DOIs
    Publication statusPublished - 2014

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    arsenic
    habitat
    degradation
    habitats
    intertidal environment
    microhabitat
    water column
    harbors (waterways)
    rocks
    littoral zone
    sand
    decomposition
    algae
    lakes
    lake
    harbor
    water
    tissue
    tissues
    Ecklonia radiata

    Cite this

    @article{fe6e6a9036914013a5b8673a79863652,
    title = "Total arsenic concentrations and arsenic species present in naturally decomposing Ecklonia radiata tissues collected from various marine habitats",
    abstract = "To investigate the release and degradation of arsenoribosides associated with the brown alga Ecklonia radiata, tissues were collected in various marine microhabitats (water column, sand intertidal, and rock platform intertidal) to establish the importance of decomposition stage and the micro-habitat in which decomposition occurs on arsenoriboside degradation. Total arsenic concentrations in E. radiata tissues varied in a similar pattern across all three sampling locations (Lake Tabourie, Burrill Lake, and Ulladulla Harbour) with concentrations in live tissues (53–124 µg As g-1 (dry mass)) greater than concentrations in tissues decomposing in the water column (28–90 µg As g-1 (dry mass)), which were in turn higher than concentrations in tissues decomposing in intertidal environments (16– 21 µg As g-1 (dry mass)). Arsenoribosides, specifically sulfonate (SO3-), phosphate (PO4-), and glycerol (Gly-) accounted for all of the arsenic extracted from live E. radiata tissues. Arsenoribosides also accounted for 100 {\%} of the extractable arsenic species in E. radiata tissues decomposing in the water column. The proportions of arsenic species in decomposing E. radiata tissue from intertidal environments varied with sampling location and therefore micro-habitat. In rock platform-based intertidal zones (Burrill Lake and Ulladulla harbour), considerable concentrations of unextractable arsenic (10–60 {\%}) were present plus known arsenoriboside degradation products such as dimethylarsinoylethanol (DMAE), dimethylarsenate (DMA), and arsenate (As(V)). In sand/beach-based intertidal zones, however, the vast majority of arsenic (˜95 {\%}) was unextractable with only small concentrations of arsenoribosides and As(V) present. This study demonstrates that the release and further degradation of arsenoribosides from E. radiata tissues occurs in a two-step process with arsenoribosides released via leaching, whilst E. radiata remains suspended within the water column. Arsenoribosides are then degraded to various intermediate arsenic species once E. radiata tissues settle on intertidal environments; however, the degree of degradation varies relative to whether decomposition occurs on rock platform or sand-based environments. These results illustrate the key role of marine micro- habitats in the degradation of arsenoribosides contained within marine macro-algae.",
    keywords = "Arsenic, Arsenoribosides, Ecklonia radiata, Decomposition, Microbial ecology, Degradation, Marine ecosystems.",
    author = "Bill MAHER and Simon FOSTER",
    year = "2014",
    doi = "10.1007/s10811-014-0258-x",
    language = "English",
    volume = "26",
    pages = "2193--2201",
    journal = "Journal of Applied Phycology",
    issn = "0921-8971",
    publisher = "Springer",

    }

    TY - JOUR

    T1 - Total arsenic concentrations and arsenic species present in naturally decomposing Ecklonia radiata tissues collected from various marine habitats

    AU - MAHER, Bill

    AU - FOSTER, Simon

    PY - 2014

    Y1 - 2014

    N2 - To investigate the release and degradation of arsenoribosides associated with the brown alga Ecklonia radiata, tissues were collected in various marine microhabitats (water column, sand intertidal, and rock platform intertidal) to establish the importance of decomposition stage and the micro-habitat in which decomposition occurs on arsenoriboside degradation. Total arsenic concentrations in E. radiata tissues varied in a similar pattern across all three sampling locations (Lake Tabourie, Burrill Lake, and Ulladulla Harbour) with concentrations in live tissues (53–124 µg As g-1 (dry mass)) greater than concentrations in tissues decomposing in the water column (28–90 µg As g-1 (dry mass)), which were in turn higher than concentrations in tissues decomposing in intertidal environments (16– 21 µg As g-1 (dry mass)). Arsenoribosides, specifically sulfonate (SO3-), phosphate (PO4-), and glycerol (Gly-) accounted for all of the arsenic extracted from live E. radiata tissues. Arsenoribosides also accounted for 100 % of the extractable arsenic species in E. radiata tissues decomposing in the water column. The proportions of arsenic species in decomposing E. radiata tissue from intertidal environments varied with sampling location and therefore micro-habitat. In rock platform-based intertidal zones (Burrill Lake and Ulladulla harbour), considerable concentrations of unextractable arsenic (10–60 %) were present plus known arsenoriboside degradation products such as dimethylarsinoylethanol (DMAE), dimethylarsenate (DMA), and arsenate (As(V)). In sand/beach-based intertidal zones, however, the vast majority of arsenic (˜95 %) was unextractable with only small concentrations of arsenoribosides and As(V) present. This study demonstrates that the release and further degradation of arsenoribosides from E. radiata tissues occurs in a two-step process with arsenoribosides released via leaching, whilst E. radiata remains suspended within the water column. Arsenoribosides are then degraded to various intermediate arsenic species once E. radiata tissues settle on intertidal environments; however, the degree of degradation varies relative to whether decomposition occurs on rock platform or sand-based environments. These results illustrate the key role of marine micro- habitats in the degradation of arsenoribosides contained within marine macro-algae.

    AB - To investigate the release and degradation of arsenoribosides associated with the brown alga Ecklonia radiata, tissues were collected in various marine microhabitats (water column, sand intertidal, and rock platform intertidal) to establish the importance of decomposition stage and the micro-habitat in which decomposition occurs on arsenoriboside degradation. Total arsenic concentrations in E. radiata tissues varied in a similar pattern across all three sampling locations (Lake Tabourie, Burrill Lake, and Ulladulla Harbour) with concentrations in live tissues (53–124 µg As g-1 (dry mass)) greater than concentrations in tissues decomposing in the water column (28–90 µg As g-1 (dry mass)), which were in turn higher than concentrations in tissues decomposing in intertidal environments (16– 21 µg As g-1 (dry mass)). Arsenoribosides, specifically sulfonate (SO3-), phosphate (PO4-), and glycerol (Gly-) accounted for all of the arsenic extracted from live E. radiata tissues. Arsenoribosides also accounted for 100 % of the extractable arsenic species in E. radiata tissues decomposing in the water column. The proportions of arsenic species in decomposing E. radiata tissue from intertidal environments varied with sampling location and therefore micro-habitat. In rock platform-based intertidal zones (Burrill Lake and Ulladulla harbour), considerable concentrations of unextractable arsenic (10–60 %) were present plus known arsenoriboside degradation products such as dimethylarsinoylethanol (DMAE), dimethylarsenate (DMA), and arsenate (As(V)). In sand/beach-based intertidal zones, however, the vast majority of arsenic (˜95 %) was unextractable with only small concentrations of arsenoribosides and As(V) present. This study demonstrates that the release and further degradation of arsenoribosides from E. radiata tissues occurs in a two-step process with arsenoribosides released via leaching, whilst E. radiata remains suspended within the water column. Arsenoribosides are then degraded to various intermediate arsenic species once E. radiata tissues settle on intertidal environments; however, the degree of degradation varies relative to whether decomposition occurs on rock platform or sand-based environments. These results illustrate the key role of marine micro- habitats in the degradation of arsenoribosides contained within marine macro-algae.

    KW - Arsenic

    KW - Arsenoribosides

    KW - Ecklonia radiata

    KW - Decomposition

    KW - Microbial ecology

    KW - Degradation

    KW - Marine ecosystems.

    U2 - 10.1007/s10811-014-0258-x

    DO - 10.1007/s10811-014-0258-x

    M3 - Article

    VL - 26

    SP - 2193

    EP - 2201

    JO - Journal of Applied Phycology

    JF - Journal of Applied Phycology

    SN - 0921-8971

    ER -