NDLI: Hypoxic blackwater events suppress the emergence of zooplankton from wetland sediments

Content Provider	Springer Nature Link
Author	Ning, Nathan S. P. Petrie, Rochelle Gawne, Ben Nielsen, Daryl L. Rees, Gavin N.
Copyright Year	2014
Abstract	The increased incidence of severe hypoxic ‘blackwater’ (high dissolved organic carbon, DOC) events as a consequence of river regulation and other river management practices poses a threat to the management of many river-floodplain systems. However, there is still a lack of fundamental knowledge regarding the effects of hypoxic blackwater events on the aquatic biota. Zooplankton occupy a central position in river-floodplain food webs, as consumers of algae, fungi and bacteria, and as potential prey items for fish, waterbirds, amphibians and macroinvertebrates. We investigated the impact of hypoxic blackwater events on river-floodplain zooplankton assemblages by examining the effects of varying DOC and dissolved oxygen concentrations on zooplankton emerging from the sediments of two floodplain wetlands in the southern Murray–Darling Basin, Australia. Hypoxic conditions significantly reduced the taxon richness and abundance of zooplankton emerging from the sediments of each wetland, whereas DOC concentration alone had no consistent effects. The effects of hypoxia on zooplankton were partially reversed when oxygen concentrations were returned to normal values within 3 weeks. These findings suggest that hypoxic blackwater events can reduce the availability of food resources to planktivorous biota through their reductions in zooplankton abundance; although these resources may be restored reasonably quickly if oxygenated conditions are returned within a short time.
Starting Page	221
Ending Page	230
Page Count	10
File Format	PDF
ISSN	10151621
Journal	Aquatic Sciences
Volume Number	77
Issue Number	2
e-ISSN	14209055
Language	English
Publisher	Springer Basel
Publisher Date	2014-11-09
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dissolved organic carbon Emergence Hypoxia Microinvertebrates Resilience River-floodplain system Freshwater & Marine Ecology Marine & Freshwater Sciences Oceanography Ecology Life Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Water Science and Technology Ecology, Evolution, Behavior and Systematics

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