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  • Seasonal nitrogen and phosphorus dynamics during benthic clam and suspended mussel cultivation

    Author(s)
    Nizzoli, Daniele
    Welsh, David Thomas
    Viaroli, Pierluigi
    Griffith University Author(s)
    Welsh, David T.
    Year published
    2011
    Metadata
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    Abstract
    Effects of suspended mussel and infaunal clam cultivation on sediment characteristics, and benthic organic and inorganic nitrogen and phosphorus fluxes were compared in a shallow coastal lagoon. The two species had different impacts on sediment features, but both created "hotspots" of nutrient fluxes with annual N and P regeneration rates being 4.9 and 13.5 (mussel) and 4.5 and 14.9 (clams) fold greater than those of unfarmed control sediments. Mussel farming also caused considerable nutrient regeneration within the water column with the mussel ropes contributing ~25% of total inorganic N and P production and at times ...
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    Effects of suspended mussel and infaunal clam cultivation on sediment characteristics, and benthic organic and inorganic nitrogen and phosphorus fluxes were compared in a shallow coastal lagoon. The two species had different impacts on sediment features, but both created "hotspots" of nutrient fluxes with annual N and P regeneration rates being 4.9 and 13.5 (mussel) and 4.5 and 14.9 (clams) fold greater than those of unfarmed control sediments. Mussel farming also caused considerable nutrient regeneration within the water column with the mussel ropes contributing ~25% of total inorganic N and P production and at times dominating the sediments (e.g. 95% of SRP production in summer and 45% of DIN production in winter). Such nutrient regeneration rates seriously question the proposal that suspension-feeding bivalves act as a eutrophication buffer, especially during summer when nutrient regeneration rates are maximal, but other nutrient sources (freshwater run-off and unfarmed sediments) are at their lowest.
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    Journal Title
    Marine Pollution Bulletin
    Volume
    62
    Issue
    6
    DOI
    https://doi.org/10.1016/j.marpolbul.2011.03.009
    Subject
    Environmental assessment and monitoring
    Publication URI
    http://hdl.handle.net/10072/42621
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