River metabolism and carbon dynamics in response to flooding in a lowland river

R.A. Cook, B. Gawne, R. Petrie, D.S. Baldwin, G.N. Rees, D.L. Nielsen, N.S.P. Ning

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    Lowland riverine-floodplain systems often have significant but irregular inputs of allochthonous carbon. However, the importance of this carbon to riverine systems remains poorly understood. We assessed open water dissolved organic carbon (DOC) concentrations, metabolism and biofilm stable isotope (δ13C) signatures, upstream and downstream of an extensive floodplain forest on the Murray River, Australia, before and after a flood event. Prior to flooding, all sites had similar concentrations of DOC, rates of metabolism and biofilm δ13C signatures. During the flood DOC concentration increased up to three-fold downstream of the forest, gross primary production (GPP) increased at all sites, but community respiration (CR) increased only at the downstream sites, resulting in decreased in NPP downstream and a slight increase upstream. Biofilm δ13C signatures became depleted by between 4 and 7‰ downstream of the forest during the flood, reflecting a rapid incorporation of allochthonous carbon into the biofilm. These results indicate that flooding led to a substantial increase to the energy budget of the Murray River through the provisioning of large quantities of allochthonous carbon and that terrestrial carbon was processed within the river biofilms. Allochthonous carbon assimilation within biofilms during flooding provides a potential pathway for allochthonous carbon to be incorporated into the metazoan foodweb. © CSIRO 2015.
    Original languageEnglish
    Pages (from-to)919-927
    Number of pages9
    JournalMarine and Freshwater Research
    Volume66
    Issue number10
    DOIs
    Publication statusPublished - 2015

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    biofilm
    lowlands
    flooding
    metabolism
    rivers
    carbon
    dissolved organic carbon
    river
    floodplains
    floodplain forest
    metazoan
    stable isotopes
    energy budget
    primary productivity
    open water
    primary production
    floodplain
    stable isotope
    respiration
    fold

    Cite this

    Cook, R. A., Gawne, B., Petrie, R., Baldwin, D. S., Rees, G. N., Nielsen, D. L., & Ning, N. S. P. (2015). River metabolism and carbon dynamics in response to flooding in a lowland river. Marine and Freshwater Research, 66(10), 919-927. https://doi.org/10.1071/MF14199
    Cook, R.A. ; Gawne, B. ; Petrie, R. ; Baldwin, D.S. ; Rees, G.N. ; Nielsen, D.L. ; Ning, N.S.P. / River metabolism and carbon dynamics in response to flooding in a lowland river. In: Marine and Freshwater Research. 2015 ; Vol. 66, No. 10. pp. 919-927.
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    abstract = "Lowland riverine-floodplain systems often have significant but irregular inputs of allochthonous carbon. However, the importance of this carbon to riverine systems remains poorly understood. We assessed open water dissolved organic carbon (DOC) concentrations, metabolism and biofilm stable isotope (δ13C) signatures, upstream and downstream of an extensive floodplain forest on the Murray River, Australia, before and after a flood event. Prior to flooding, all sites had similar concentrations of DOC, rates of metabolism and biofilm δ13C signatures. During the flood DOC concentration increased up to three-fold downstream of the forest, gross primary production (GPP) increased at all sites, but community respiration (CR) increased only at the downstream sites, resulting in decreased in NPP downstream and a slight increase upstream. Biofilm δ13C signatures became depleted by between 4 and 7‰ downstream of the forest during the flood, reflecting a rapid incorporation of allochthonous carbon into the biofilm. These results indicate that flooding led to a substantial increase to the energy budget of the Murray River through the provisioning of large quantities of allochthonous carbon and that terrestrial carbon was processed within the river biofilms. Allochthonous carbon assimilation within biofilms during flooding provides a potential pathway for allochthonous carbon to be incorporated into the metazoan foodweb. {\circledC} CSIRO 2015.",
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    Cook, RA, Gawne, B, Petrie, R, Baldwin, DS, Rees, GN, Nielsen, DL & Ning, NSP 2015, 'River metabolism and carbon dynamics in response to flooding in a lowland river', Marine and Freshwater Research, vol. 66, no. 10, pp. 919-927. https://doi.org/10.1071/MF14199

    River metabolism and carbon dynamics in response to flooding in a lowland river. / Cook, R.A.; Gawne, B.; Petrie, R.; Baldwin, D.S.; Rees, G.N.; Nielsen, D.L.; Ning, N.S.P.

    In: Marine and Freshwater Research, Vol. 66, No. 10, 2015, p. 919-927.

    Research output: Contribution to journalArticle

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    AU - Cook, R.A.

    AU - Gawne, B.

    AU - Petrie, R.

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    N2 - Lowland riverine-floodplain systems often have significant but irregular inputs of allochthonous carbon. However, the importance of this carbon to riverine systems remains poorly understood. We assessed open water dissolved organic carbon (DOC) concentrations, metabolism and biofilm stable isotope (δ13C) signatures, upstream and downstream of an extensive floodplain forest on the Murray River, Australia, before and after a flood event. Prior to flooding, all sites had similar concentrations of DOC, rates of metabolism and biofilm δ13C signatures. During the flood DOC concentration increased up to three-fold downstream of the forest, gross primary production (GPP) increased at all sites, but community respiration (CR) increased only at the downstream sites, resulting in decreased in NPP downstream and a slight increase upstream. Biofilm δ13C signatures became depleted by between 4 and 7‰ downstream of the forest during the flood, reflecting a rapid incorporation of allochthonous carbon into the biofilm. These results indicate that flooding led to a substantial increase to the energy budget of the Murray River through the provisioning of large quantities of allochthonous carbon and that terrestrial carbon was processed within the river biofilms. Allochthonous carbon assimilation within biofilms during flooding provides a potential pathway for allochthonous carbon to be incorporated into the metazoan foodweb. © CSIRO 2015.

    AB - Lowland riverine-floodplain systems often have significant but irregular inputs of allochthonous carbon. However, the importance of this carbon to riverine systems remains poorly understood. We assessed open water dissolved organic carbon (DOC) concentrations, metabolism and biofilm stable isotope (δ13C) signatures, upstream and downstream of an extensive floodplain forest on the Murray River, Australia, before and after a flood event. Prior to flooding, all sites had similar concentrations of DOC, rates of metabolism and biofilm δ13C signatures. During the flood DOC concentration increased up to three-fold downstream of the forest, gross primary production (GPP) increased at all sites, but community respiration (CR) increased only at the downstream sites, resulting in decreased in NPP downstream and a slight increase upstream. Biofilm δ13C signatures became depleted by between 4 and 7‰ downstream of the forest during the flood, reflecting a rapid incorporation of allochthonous carbon into the biofilm. These results indicate that flooding led to a substantial increase to the energy budget of the Murray River through the provisioning of large quantities of allochthonous carbon and that terrestrial carbon was processed within the river biofilms. Allochthonous carbon assimilation within biofilms during flooding provides a potential pathway for allochthonous carbon to be incorporated into the metazoan foodweb. © CSIRO 2015.

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