The effect of water extraction regime on the chemistry and macro invertebrates of a subtropical coastal freshwater wetland

Parkyn, J. and Specht, A. (2011) The effect of water extraction regime on the chemistry and macro invertebrates of a subtropical coastal freshwater wetland. Proceedings of the Royal Society of Queensland, 117 225-238.

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Author Parkyn, J.
Specht, A.
Title The effect of water extraction regime on the chemistry and macro invertebrates of a subtropical coastal freshwater wetland
Journal name Proceedings of the Royal Society of Queensland   Check publisher's open access policy
ISSN 0080-469X
Publication date 2011
Sub-type Article (original research)
Volume 117
Start page 225
End page 238
Total pages 14
Editor A. H. Arthington
T. J. Page
C. W. Rose
S. Raghu
Place of publication St. Lucia, QLD, Australia
Publisher Royal Society of Queensland
Collection year 2012
Language eng
Formatted abstract
In this paper it is demonstrated, through an instance of a localized short-term oscillating mode of water extraction from a large coastal oligotrophic hind-dune peat swamp, Eighteen Mile Swamp, North Stradbroke Island, that the mode of water extraction is as important as the amount of water extracted. A six-year duration, high-frequency drought-wetting cycle imposed by a point-source extraction regime has had apparently irreversible effects on the adjacent peat and macro invertebrates. The legacy of this short-term alteration in hydrological conditions has been the disintegration of the peat with consequent release oflarge amounts of otherwise captured nutrients and a significant increase in biological oxygen demand. This is associated with significant reductions in macroinvertebrate abundance and richness, with a reduction in soft-bodied taxa as Coleoptera becoming dominant. Although full suites of biota were present in nearby unaffected locations, the substrate is sufficiently altered that there can be no short-term prospect of rehabilitation of the area affected by this water extraction. This chain of events illustrates a catastrophic regime shift or 'ecological surprise'. Defining the point of no return (a threshold) would have to be demonstrated experimentally.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published under "Wildlife, Wild Plants". Special issue: "A Place of Sandhills: Ecology, Hydrogeomorphology and Management of Queensland’s Dune Islands".

Document type: Journal Article
Sub-type: Article (original research)
Collections: Faculty of Science Publications
Official 2012 Collection
 
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Created: Thu, 31 May 2012, 14:29:24 EST by Jon Swabey on behalf of Terrestrial Ecosystem Research Network