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  • Multiple lines of evidence determine robust nutrient load limits required to safeguard a threatened lake/lagoon system

    Author(s)
    Schallenberg, M
    Hamilton, DP
    Hicks, AS
    Robertson, HA
    Scarsbrook, M
    Robertson, B
    Wilson, K
    Whaanga, D
    Jones, HFE
    Hamill, K
    Griffith University Author(s)
    Hamilton, David P.
    Year published
    2017
    Metadata
    Show full item record
    Abstract
    Three independent scientific lines of evidence were sought to determine the nutrient load limits to safeguard the macrophyte community of an intermittently closed and open lake/lagoon (ICOLL): (1) a literature review identified nitrogen load thresholds related to the collapse of macrophytes in similar systems in Australia, Europe and elsewhere, (2) an ICOLL expert carried out an assessment based on current local data and on data from 57 Australian coastal lakes and lagoons, and (3) a deterministic coupled hydrodynamic-ecological model was developed and applied to simulate the ecological outcomes of several nutrient loading ...
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    Three independent scientific lines of evidence were sought to determine the nutrient load limits to safeguard the macrophyte community of an intermittently closed and open lake/lagoon (ICOLL): (1) a literature review identified nitrogen load thresholds related to the collapse of macrophytes in similar systems in Australia, Europe and elsewhere, (2) an ICOLL expert carried out an assessment based on current local data and on data from 57 Australian coastal lakes and lagoons, and (3) a deterministic coupled hydrodynamic-ecological model was developed and applied to simulate the ecological outcomes of several nutrient loading scenarios. The three lines of evidence converged on well-defined nitrogen load estimates required to avoid the collapse of the macrophyte community. Uncertainties were slightly greater in relation to required phosphorus load limits, but the evidence still helped set a precautionary phosphorus load limit that accounted for these uncertainties. Thus, despite the challenges in setting load limits for complex ecosystems, multiple lines of evidence helped derive robust nutrient load limits for managing the ICOLL to safeguard values associated with a healthy macrophyte community.
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    Journal Title
    New Zealand Journal of Marine and Freshwater Research
    Volume
    51
    Issue
    1
    DOI
    https://doi.org/10.1080/00288330.2016.1267651
    Funder(s)
    ARC
    Grant identifier(s)
    DP190101848
    Subject
    Earth sciences
    Environmental sciences
    Environmental management not elsewhere classified
    Biological sciences
    Publication URI
    http://hdl.handle.net/10072/336687
    Collection
    • Journal articles

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