Longitudinal spatial variation in ecological conditions in an in-channel floodplain river system during flow pulses

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dc.contributor.authorKobayashi, Ten_AU
dc.contributor.authorRyder, DSen_AU
dc.contributor.authorRalph, TJen_AU
dc.contributor.authorMazumder, Den_AU
dc.contributor.authorSaintilan, Nen_AU
dc.contributor.authorIles, Jen_AU
dc.contributor.authorKnowles, Len_AU
dc.contributor.authorThomas, Ren_AU
dc.contributor.authorHunter, Sen_AU
dc.date.accessioned2011-07-28T02:33:13Zen_AU
dc.date.available2011-07-28T02:33:13Zen_AU
dc.date.issued2011-05-01en_AU
dc.date.statistics2011-07-28en_AU
dc.description.abstractA field survey was conducted during flow pulses to investigate the longitudinal spatial patterns in water quality, dissolved inorganic and organic matter, phytoplankton, planktonic bacteria, zooplankton, gross primary productivity (GPP) of phytoplankton and planktonic respiration (PR) in channels of the large floodplain system (similar to 124 km in length) of the Macquarie Marshes, south-eastern Australia. Four river reaches (areas) with distinct hydrogeomorphological characteristics within the distributary zone of the lower Macquarie River were chosen for analysis of abiotic and biotic variables in their in-stream environments. The results showed marked longitudinal spatial variation in the values within and among the measured environmental variables including such functional aspects as primary productivity and PR. The variables that tended to have increasing values in a downstream direction were conductivity, total nitrogen (TN), total phosphorus (TP), dissolved reactive phosphorus (DRP), dissolved silica, dissolved organic carbon (DOC), dissolved organic nitrogen (DON), dissolved organic phosphorus (DOP), ratio of DOC/DON and counts of planktonic bacteria. Conversely, the values that tended to decrease downstream were the ratios of TN/TP, DIN/DRP, DOC/DOP, DON/DOP and GPP/PR. Variables that had a localized peak(s) were dissolved oxygen, turbidity, dissolved inorganic nitrogen, GPP, PR and counts of cyanobacteria, diatoms, green algae, cryptomonads, protozoans, rotifers, copepods and cladocerans. Overall, two distinct ecological zones were identified within the broader distributary functional process zone (FPZ): these being the upstream zone with relatively high levels of DO, turbidity, diatoms and GPP/PR ratio, and the downstream zone with relatively high levels of nutrients, dissolved organic matter, cyanobacteria, planktonic bacteria, protozoans and cladocerans. The results of this study describe the spatial connectivity of ecological processes related to hydrogeomorphological factors within a FPZ of a riverine ecosystem, and support the predictions of the riverine ecosystem synthesis framework that ecological patterns and processes can be discontinuous on a longitudinal spatial scale. Copyright (C) 2010 John Wiley & Sons, Ltd.en_AU
dc.identifier.citationKobayashi, T., Ryder, D.S., Ralph, T.J., Mazumder, D., Saintilan, N., Iles, J., Knowles, L., Thomas, R., Hunter, S. (2011). Longitudinal spatial variation in ecological conditions in an in-channel floodplain river system during flow pulses. River Research and Applications, 27(4). 461-472. doi:10.1002/rra.1381en_AU
dc.identifier.govdoc2344en_AU
dc.identifier.issn1535-1459en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleRiver Research and Applicationsen_AU
dc.identifier.pagination461-472en_AU
dc.identifier.urihttp://dx.doi.org/10.1002/rra.1381en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3631en_AU
dc.identifier.volume27en_AU
dc.language.isoenen_AU
dc.publisherWiley-Blackwellen_AU
dc.subjectRiversen_AU
dc.subjectVariationsen_AU
dc.subjectEcosystemsen_AU
dc.subjectFloodsen_AU
dc.subjectWater qualityen_AU
dc.subjectEcologyen_AU
dc.titleLongitudinal spatial variation in ecological conditions in an in-channel floodplain river system during flow pulsesen_AU
dc.typeJournal Articleen_AU
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