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  • Parameterizing plankton functional type models: insights from a dynamical systems perspective

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    Author(s)
    Cropp, Roger
    Norbury, John
    Griffith University Author(s)
    Cropp, Roger A.
    Year published
    2009
    Metadata
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    Abstract
    The spectre of anthropogenic global climate change has focused attention on biogeochemical cycling in the oceans as marine plankton ecosystems are involved in the cycling of several compounds thought to have significant implications for climate. To better understand these processes, modellers are developing plankton functional type (PFT) models that group plankton according to their biogeochemical properties. There is some debate as to whether our understanding of plankton ecosystems is sufficiently well developed for PFT models to be reliable and for their predictions to be treated with confidence. In this paper, we examine ...
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    The spectre of anthropogenic global climate change has focused attention on biogeochemical cycling in the oceans as marine plankton ecosystems are involved in the cycling of several compounds thought to have significant implications for climate. To better understand these processes, modellers are developing plankton functional type (PFT) models that group plankton according to their biogeochemical properties. There is some debate as to whether our understanding of plankton ecosystems is sufficiently well developed for PFT models to be reliable and for their predictions to be treated with confidence. In this paper, we examine the dynamical properties of a generic predator-prey-prey PFT model, then apply these analysis techniques to a simple example PFT model with two phytoplankton and one zooplankton in order to explore its parameter space. We find that parameter combinations for which all PFTs stay extant for all time appear rare, but develop a simple heuristic that allows such parameter sets to be identified relatively easily for many PFT models. We observe that such systems often have phytoplankton with similar growth rates, but that differ in other properties such as differing nutrient utilisation strategies or different susceptibilities to grazing. We also note that persistent PFT systems are more likely if neither phytoplankton have a low specific mortality rate or is a highly nutritious food for the grazer.
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    Journal Title
    Journal of Plankton Research
    Volume
    31
    Issue
    9
    Publisher URI
    http://plankt.oxfordjournals.org/
    DOI
    https://doi.org/10.1093/plankt/fbp042
    Copyright Statement
    This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Journal of Plankton Research following peer review. The definitive publisher-authenticated version Journal of Plankton Research, 2009 31(9):939-963 is available online at: http://dx.doi.org/10.1093/plankt/fbp042
    Subject
    Biological oceanography
    Ecosystem function
    Ecology
    Zoology
    Fisheries sciences
    Publication URI
    http://hdl.handle.net/10072/25994
    Collection
    • Journal articles

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