Patterns of primary and heterotrophic productivity in an arid lowland river

Ben Gawne, Chester Merrick, David Williams, Gavin Rees, Roderick Oliver, Patricia Bowen, Simon Treadwell, Gillian Beattie, Iain Ellis, Judy Frankenberg, Zygmunt Lorenz

    Research output: Contribution to journalArticle

    36 Citations (Scopus)

    Abstract

    Three river conceptual models make differing predictions about the major source of primary production in lowland rivers, acknowledging the importance of primary productivity in the ecology and management of lowland rivers. Patterns of primary production in lowland rivers are still an area of considerable uncertainty. The objective of this study was to examine the major sources and transformations of organic matter in an Australian lowland river and compare them to the predictions of existing models. The broad approach adopted was to quantify the contribution from the major ecosystem components and compare these with estimates of system metabolism determined using open water measures of diel oxygen change. Three 4-km river reaches were selected to represent the extent of variation found along the free-flowing lowland sections of the Murray River, one of Australia's largest and most regulated rivers. Annual open water gross primary production (GPP) estimates for the Murray R. during this study ranged from 221 to 376 gC m−2 y−1 and were similar to other large rivers. Examination of the net contribution of organic matter to the channel indicates that primary productivity in the Murray R. is derived from a combination of phytoplankton, riparian vegetation and macrophytes, but that the major source varies both spatially and temporally. The present study confirms that the River Continuum Concept (RCC), the Flood Pulse Concept (FPC) and Riverine Productivity Model (RPM) all have some application to Australian lowland rivers, but that synthesis of the models will be difficult until we can incorporate the extent, causes and consequences of primary production variability. This study also highlights the importance of the microbial loop and macrophytes in the ecology of the Murray
    Original languageEnglish
    Pages (from-to)1070-1087
    Number of pages18
    JournalRiver Research and Applications
    Volume23
    Issue number10
    DOIs
    Publication statusPublished - 2007

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    Productivity
    Rivers
    productivity
    river
    primary production
    Ecology
    open water
    Biological materials
    ecology
    microbial loop
    organic matter
    Water
    Phytoplankton
    riparian vegetation
    prediction
    Metabolism
    Ecosystems
    metabolism
    phytoplankton
    Oxygen

    Cite this

    Gawne, B., Merrick, C., Williams, D., Rees, G., Oliver, R., Bowen, P., ... Lorenz, Z. (2007). Patterns of primary and heterotrophic productivity in an arid lowland river. River Research and Applications, 23(10), 1070-1087. https://doi.org/10.1002/rra.1033
    Gawne, Ben ; Merrick, Chester ; Williams, David ; Rees, Gavin ; Oliver, Roderick ; Bowen, Patricia ; Treadwell, Simon ; Beattie, Gillian ; Ellis, Iain ; Frankenberg, Judy ; Lorenz, Zygmunt. / Patterns of primary and heterotrophic productivity in an arid lowland river. In: River Research and Applications. 2007 ; Vol. 23, No. 10. pp. 1070-1087.
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    abstract = "Three river conceptual models make differing predictions about the major source of primary production in lowland rivers, acknowledging the importance of primary productivity in the ecology and management of lowland rivers. Patterns of primary production in lowland rivers are still an area of considerable uncertainty. The objective of this study was to examine the major sources and transformations of organic matter in an Australian lowland river and compare them to the predictions of existing models. The broad approach adopted was to quantify the contribution from the major ecosystem components and compare these with estimates of system metabolism determined using open water measures of diel oxygen change. Three 4-km river reaches were selected to represent the extent of variation found along the free-flowing lowland sections of the Murray River, one of Australia's largest and most regulated rivers. Annual open water gross primary production (GPP) estimates for the Murray R. during this study ranged from 221 to 376 gC m−2 y−1 and were similar to other large rivers. Examination of the net contribution of organic matter to the channel indicates that primary productivity in the Murray R. is derived from a combination of phytoplankton, riparian vegetation and macrophytes, but that the major source varies both spatially and temporally. The present study confirms that the River Continuum Concept (RCC), the Flood Pulse Concept (FPC) and Riverine Productivity Model (RPM) all have some application to Australian lowland rivers, but that synthesis of the models will be difficult until we can incorporate the extent, causes and consequences of primary production variability. This study also highlights the importance of the microbial loop and macrophytes in the ecology of the Murray",
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    Gawne, B, Merrick, C, Williams, D, Rees, G, Oliver, R, Bowen, P, Treadwell, S, Beattie, G, Ellis, I, Frankenberg, J & Lorenz, Z 2007, 'Patterns of primary and heterotrophic productivity in an arid lowland river', River Research and Applications, vol. 23, no. 10, pp. 1070-1087. https://doi.org/10.1002/rra.1033

    Patterns of primary and heterotrophic productivity in an arid lowland river. / Gawne, Ben; Merrick, Chester; Williams, David; Rees, Gavin; Oliver, Roderick; Bowen, Patricia; Treadwell, Simon; Beattie, Gillian; Ellis, Iain; Frankenberg, Judy; Lorenz, Zygmunt.

    In: River Research and Applications, Vol. 23, No. 10, 2007, p. 1070-1087.

    Research output: Contribution to journalArticle

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    T1 - Patterns of primary and heterotrophic productivity in an arid lowland river

    AU - Gawne, Ben

    AU - Merrick, Chester

    AU - Williams, David

    AU - Rees, Gavin

    AU - Oliver, Roderick

    AU - Bowen, Patricia

    AU - Treadwell, Simon

    AU - Beattie, Gillian

    AU - Ellis, Iain

    AU - Frankenberg, Judy

    AU - Lorenz, Zygmunt

    PY - 2007

    Y1 - 2007

    N2 - Three river conceptual models make differing predictions about the major source of primary production in lowland rivers, acknowledging the importance of primary productivity in the ecology and management of lowland rivers. Patterns of primary production in lowland rivers are still an area of considerable uncertainty. The objective of this study was to examine the major sources and transformations of organic matter in an Australian lowland river and compare them to the predictions of existing models. The broad approach adopted was to quantify the contribution from the major ecosystem components and compare these with estimates of system metabolism determined using open water measures of diel oxygen change. Three 4-km river reaches were selected to represent the extent of variation found along the free-flowing lowland sections of the Murray River, one of Australia's largest and most regulated rivers. Annual open water gross primary production (GPP) estimates for the Murray R. during this study ranged from 221 to 376 gC m−2 y−1 and were similar to other large rivers. Examination of the net contribution of organic matter to the channel indicates that primary productivity in the Murray R. is derived from a combination of phytoplankton, riparian vegetation and macrophytes, but that the major source varies both spatially and temporally. The present study confirms that the River Continuum Concept (RCC), the Flood Pulse Concept (FPC) and Riverine Productivity Model (RPM) all have some application to Australian lowland rivers, but that synthesis of the models will be difficult until we can incorporate the extent, causes and consequences of primary production variability. This study also highlights the importance of the microbial loop and macrophytes in the ecology of the Murray

    AB - Three river conceptual models make differing predictions about the major source of primary production in lowland rivers, acknowledging the importance of primary productivity in the ecology and management of lowland rivers. Patterns of primary production in lowland rivers are still an area of considerable uncertainty. The objective of this study was to examine the major sources and transformations of organic matter in an Australian lowland river and compare them to the predictions of existing models. The broad approach adopted was to quantify the contribution from the major ecosystem components and compare these with estimates of system metabolism determined using open water measures of diel oxygen change. Three 4-km river reaches were selected to represent the extent of variation found along the free-flowing lowland sections of the Murray River, one of Australia's largest and most regulated rivers. Annual open water gross primary production (GPP) estimates for the Murray R. during this study ranged from 221 to 376 gC m−2 y−1 and were similar to other large rivers. Examination of the net contribution of organic matter to the channel indicates that primary productivity in the Murray R. is derived from a combination of phytoplankton, riparian vegetation and macrophytes, but that the major source varies both spatially and temporally. The present study confirms that the River Continuum Concept (RCC), the Flood Pulse Concept (FPC) and Riverine Productivity Model (RPM) all have some application to Australian lowland rivers, but that synthesis of the models will be difficult until we can incorporate the extent, causes and consequences of primary production variability. This study also highlights the importance of the microbial loop and macrophytes in the ecology of the Murray

    U2 - 10.1002/rra.1033

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    SN - 0886-9375

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    Gawne B, Merrick C, Williams D, Rees G, Oliver R, Bowen P et al. Patterns of primary and heterotrophic productivity in an arid lowland river. River Research and Applications. 2007;23(10):1070-1087. https://doi.org/10.1002/rra.1033