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RESEARCH ARTICLE

Open water metabolism and dissolved organic carbon in response to environmental watering in a lowland river–floodplain complex

Todd A. Wallace A B and Deborah Furst A
+ Author Affiliations
- Author Affiliations

A School of Biological Sciences, The University of Adelaide, Adelaide, SA 5005, Australia.

B Corresponding author. Email todd.wallace@adelaide.edu.au

Marine and Freshwater Research 67(9) 1346-1361 https://doi.org/10.1071/MF15318
Submitted: 13 August 2015  Accepted: 19 November 2015   Published: 5 February 2016

Abstract

The relative importance of autochthonous and allochthonous organic material in fuelling ecosystem metabolism is increasingly understood for some river systems. However, in south-eastern Australia, the majority of studies have been conducted during low flows when the supply of allochthonous carbon was limited. Consequently, the importance of episodic inputs of terrestrially derived material in supporting these food webs remains poorly understood. We assessed the influence of return flows from two different scales of environmental watering actions on dissolved organic carbon and open-water productivity in receiving waters adjacent to the watered area. For the wetland-scale event, gross primary productivity and ecosystem respiration increased in the receiving waters during the period of return flows. During the floodplain-scale watering, differences were observed among sites. Within the managed inundation zone, values for net ecosystem productivity switched from near zero during the baseline to strongly negative during the impact period, whereas values at the river sites were either near zero or positive. The results contribute to our understanding of the relative role of allochthonous material in supporting aquatic food webs in lowland rivers, and demonstrate potential for watering actions to have a positive influence on riverine productivity during periods of low water availability.

Additional keywords: allochthonous, net ecosystem production, environmental flows.


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