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  • Changes to chronic nitrogen loading from sewage discharges modify standing stocks of coastal phytoplankton

    Author(s)
    Saeck, Emily A
    O'Brien, Katherine R
    Weber, Tony R
    Burford, Michele A
    Griffith University Author(s)
    Burford, Michele A.
    Saeck, Emily
    Year published
    2013
    Metadata
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    Abstract
    Nutrient delivery in subtropical coastal systems is predominantly via acute episodic high flow events. However, continuous nutrient discharges from point sources alter these natural fluctuations in nutrient delivery, and are therefore likely to lead to different ecosystem responses. The aim of this study was to assess how a reduction in chronic sewage nutrient inputs affected chlorophyll a (chl a) concentrations in a subtropical bay, in the context of seasonal fluctuations in riverine nutrient inflows. Reduced nutrient inputs from a large sewage treatment plant (STP) resulted in lower mean dissolved inorganic nitrogen and ...
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    Nutrient delivery in subtropical coastal systems is predominantly via acute episodic high flow events. However, continuous nutrient discharges from point sources alter these natural fluctuations in nutrient delivery, and are therefore likely to lead to different ecosystem responses. The aim of this study was to assess how a reduction in chronic sewage nutrient inputs affected chlorophyll a (chl a) concentrations in a subtropical bay, in the context of seasonal fluctuations in riverine nutrient inflows. Reduced nutrient inputs from a large sewage treatment plant (STP) resulted in lower mean dissolved inorganic nitrogen and phytoplankton chl a concentrations during both the austral summer wet and winter dry season. This was measurable within 10 y of nutrient reductions and despite the confounding effects of nutrient inflow events. Our study demonstrates that reductions in STP inputs can have significant effects on phytoplankton biomass despite confounding factors over relatively short time frames.
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    Journal Title
    Marine Pollution Bulletin
    Volume
    71
    Issue
    1-2
    DOI
    https://doi.org/10.1016/j.marpolbul.2013.03.020
    Subject
    Environmental Management
    Publication URI
    http://hdl.handle.net/10072/55509
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