The role of bioirrigation in sediment phosphorus dynamics and blooms of toxic cyanobacteria in a temperate lagoon

Y. Zhu, Matthew R. Hipsey, A. Mccowan, J. Beardall, P.L.M. Cook

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    © 2016 Elsevier Ltd
    A 3-D coupled hydrodynamic-biogeochemical/ecological model was developed and validated for the coastal Gippsland Lakes system, Australia, to explore the importance of bioirrigation on sediment phosphorus dynamics and the subsequent effects on the formation of summer blooms of Nodularia spumigena. Bottom water phosphorus concentrations and sediment phosphorus fluxes were most accurately simulated with bioirrigation implemented into the model. Further model simulations showed that bioirrigation selectively increased the flux of phosphorus relative to nitrogen leading to sediment N:P release ratios as low as 2. High summer phosphorus levels controlled the duration, size and severity of N. spumigena blooms; however, temperature and salinity were the primary factors that determined bloom formation and location. An assessment of sensitivity to model complexity identified that the model could only reproduce the observed N. spumigena bloom size when bioirrigation was implemented, highlighting the ecological importance of bioirrigation in phosphorus cycling and cyanobacteria bloom dynamics.
    Original languageEnglish
    Pages (from-to)277-304
    JournalEnvironmental Modelling and Software
    Volume86
    Early online date27 Oct 2016
    DOIs
    Publication statusPublished - Dec 2016

    Fingerprint

    Phosphorus
    cyanobacterium
    lagoon
    Sediments
    algal bloom
    phosphorus
    sediment
    Fluxes
    summer
    bottom water
    Lakes
    Cyanobacteria
    Hydrodynamics
    hydrodynamics
    Nitrogen
    salinity
    nitrogen
    lake
    simulation
    Water

    Cite this

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    title = "The role of bioirrigation in sediment phosphorus dynamics and blooms of toxic cyanobacteria in a temperate lagoon",
    abstract = "{\circledC} 2016 Elsevier LtdA 3-D coupled hydrodynamic-biogeochemical/ecological model was developed and validated for the coastal Gippsland Lakes system, Australia, to explore the importance of bioirrigation on sediment phosphorus dynamics and the subsequent effects on the formation of summer blooms of Nodularia spumigena. Bottom water phosphorus concentrations and sediment phosphorus fluxes were most accurately simulated with bioirrigation implemented into the model. Further model simulations showed that bioirrigation selectively increased the flux of phosphorus relative to nitrogen leading to sediment N:P release ratios as low as 2. High summer phosphorus levels controlled the duration, size and severity of N. spumigena blooms; however, temperature and salinity were the primary factors that determined bloom formation and location. An assessment of sensitivity to model complexity identified that the model could only reproduce the observed N. spumigena bloom size when bioirrigation was implemented, highlighting the ecological importance of bioirrigation in phosphorus cycling and cyanobacteria bloom dynamics.",
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    The role of bioirrigation in sediment phosphorus dynamics and blooms of toxic cyanobacteria in a temperate lagoon. / Zhu, Y.; Hipsey, Matthew R.; Mccowan, A.; Beardall, J.; Cook, P.L.M.

    In: Environmental Modelling and Software, Vol. 86, 12.2016, p. 277-304.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - The role of bioirrigation in sediment phosphorus dynamics and blooms of toxic cyanobacteria in a temperate lagoon

    AU - Zhu, Y.

    AU - Hipsey, Matthew R.

    AU - Mccowan, A.

    AU - Beardall, J.

    AU - Cook, P.L.M.

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    AB - © 2016 Elsevier LtdA 3-D coupled hydrodynamic-biogeochemical/ecological model was developed and validated for the coastal Gippsland Lakes system, Australia, to explore the importance of bioirrigation on sediment phosphorus dynamics and the subsequent effects on the formation of summer blooms of Nodularia spumigena. Bottom water phosphorus concentrations and sediment phosphorus fluxes were most accurately simulated with bioirrigation implemented into the model. Further model simulations showed that bioirrigation selectively increased the flux of phosphorus relative to nitrogen leading to sediment N:P release ratios as low as 2. High summer phosphorus levels controlled the duration, size and severity of N. spumigena blooms; however, temperature and salinity were the primary factors that determined bloom formation and location. An assessment of sensitivity to model complexity identified that the model could only reproduce the observed N. spumigena bloom size when bioirrigation was implemented, highlighting the ecological importance of bioirrigation in phosphorus cycling and cyanobacteria bloom dynamics.

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