, Volume 702, Issue 1, pp 45–62 | Cite as

Zooplankton dynamics in response to the transition from drought to flooding in four Murray–Darling Basin rivers affected by differing levels of flow regulation

  • Nathan S. P. Ning
  • Ben Gawne
  • Robert A. Cook
  • Daryl L. Nielsen
Primary Research Paper


Extreme low and high flow periods associated with droughts and floods regularly influence many river systems, yet little is known regarding their role in shaping riverine zooplankton communities. This study investigated zooplankton dynamics in response to the transition from drought to flooding in four southern Murray–Darling Basin rivers managed by different levels of flow regulation. Results indicated that the onset of flooding was associated with an increase in the taxon richness and total transport (abundance) of zooplankton in the unregulated Ovens and Kiewa Rivers, and an increase in the total transport of zooplankton in the mildly regulated Broken River. In comparison, no significant flood effects on zooplankton taxon richness or transport were detected in the highly regulated Murray River. This suggests that the flooding was beneficial for enhancing zooplankton abundance in the Ovens, Kiewa and Broken Rivers, whereas any potential benefits were comparatively short-term and/or reduced in the Murray River. We hypothesise that the relatively short-term and/or reduced response of the zooplankton community to the flooding in the Murray River was probably largely due to the occurrence of a hypoxic blackwater event in suppressing zooplankton emergence.


Australia Disturbance Hydrology Productivity Regulated river 



We gratefully acknowledge Professor Marti Anderson for providing advice regarding statistical analysis. We also thank all of The MDFRC staff who assisted with field work and sample processing, particularly Helen Gigney, Rochelle Petrie, John Pengelly, Simon Maffei, Jonathon Thompson, and Karla Williams. This study was funded by the Department of Sustainability, Environment, Water, Populations and Communities and the Murray–Darling Basin Authority.


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Nathan S. P. Ning
    • 1
    • 2
  • Ben Gawne
    • 1
    • 2
  • Robert A. Cook
    • 1
    • 2
  • Daryl L. Nielsen
    • 1
    • 3
  1. 1.The Murray-Darling Freshwater Research CentreWodongaAustralia
  2. 2.La Trobe UniversityWodongaAustralia
  3. 3.CSIRO Land and WaterWodongaAustralia

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