ORCID Profile
0000-0002-9612-4862
Current Organisations
Macquarie University
,
NSW Department of Planning, Industry and Environment
,
Charles Sturt University
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Publisher: Springer Science and Business Media LLC
Date: 15-04-2014
Publisher: Springer Science and Business Media LLC
Date: 20-01-2009
Publisher: Springer Science and Business Media LLC
Date: 03-08-2013
DOI: 10.1007/S00267-013-0130-9
Abstract: Hypoxic blackwater events occur when large amounts of organic material are leached into a water body (e.g., during floodplain inundation) and rapid metabolism of this carbon depletes oxygen from the water column, often with catastrophic effects on the aquatic environment. River regulation may have increased the frequency and severity of hypoxic blackwater events in lowland river systems, necessitating management intervention to mitigate the impacts of these events on aquatic biota. We examine the effectiveness of a range of mitigation interventions that have been used during large-scale hypoxic blackwater events in the Murray-Darling Basin, Australia and that may be applicable in other environments at risk from hypoxic blackwater. Strategies for hypoxia mitigation include: delivery of dilution flows enhancement of physical re-aeration rates by increasing surface turbulence and ersion of blackwater into shallow off-channel storages. We show that the impact of dilution water delivery is determined by relative volumes and water quality and can be predicted using simple models. At the dilution water inflow point, localized oxygenated plumes may also act as refuges. Physical re-aeration strategies generally result in only a small increase in dissolved oxygen but may be beneficial for local refuge protection. Dilution and natural re-aeration processes in large, shallow lake systems can be sufficient to compensate for hypoxic inflows and water processed in off-channel lakes may be able to be returned to the river channel as dilution flows. We provide a set of predictive models (as electronic supplementary material) for estimation of the re-aeration potential of intervention activities and a framework to guide the adaptive management of future hypoxic blackwater events.
Publisher: Oxford University Press (OUP)
Date: 10-09-2011
Publisher: CSIRO Publishing
Date: 2021
DOI: 10.1071/WF20081
Abstract: The devastating bushfires of the 2019–20 summer are arguably the most costly natural disaster in Australian recorded history. What is little known is that these fires severely affected the temperate highland peat sw s on sandstone (THPSS), a form of upland wetland that occurs in the water supply catchments of Sydney in the Greater Blue Mountains World Heritage Area and National Park. During the fires, 59% of THPSS was burnt and 72% of those by a high severity burn. Upland sw s at Newnes were the most affected, with 96% of sw s burnt and 84% of these experiencing a very high burn severity. We present an analysis of the spatial extent and severity of the bushfire on the THPSS and discuss some of the likely consequences on their geomorphological, hydrological and ecological structure, function and recovery potential.
Publisher: Springer Science and Business Media LLC
Date: 28-04-2017
Publisher: Springer Science and Business Media LLC
Date: 04-2022
DOI: 10.1007/S13157-022-01550-W
Abstract: Ponds and wetlands around the world face anthropogenic pressures that threaten key ecosystem processes such as nutrient and organic matter cycling. Wetlands in arid and semi-arid regions are particularly at risk from uncertainty of water availability and competing pressures for use. Such threats are most acute for non-perennial systems that rely on occasional surface water flows to maintain important ecological functions. This study investigates the decomposition of an endemic macrophyte Cycnogeton procerum (R.Br.) Buchenau as a key ecosystem process in a chain-of-ponds wetland system, located in the intermittently flowing Mulwaree River, New South Wales, Australia. The aims of this study were to identify spatial and temporal patterns and the relative importance of microbial activity in macrophyte decomposition to improve our understanding of ecological processes in these intermittent systems. Exponential decomposition rates (proportional mass loss (g)) were highest during spring and summer (0.07-0.10 kd -1 ) and slower during autumn and winter (0.03-0.04 kd -1 ), reflecting seasonal drivers. Decomposition was significantly different in 9 mm and 150 μm mesh bags only during spring, suggesting decomposition was mostly performed by microbes, with invertebrate herbivores possibly only a factor during spring lotic conditions. Mesotrophic conditions, regulated by flow and internal macrophyte and algal dynamics appear to maintain a highly productive, macrophyte-dominated aquatic wetland system. Temperature was a major factor in decomposition rates and expected increases due to climate change will accentuate pressure on the resilience of the macrophyte community. Alterations caused by changing climate and anthropogenic land use place the ponds at high risk.
Publisher: Wiley
Date: 31-05-2019
DOI: 10.1002/RRA.3453
Location: Australia
Location: No location found
No related grants have been discovered for Lorraine Hardwick.