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Testing the Flood Pulse Concept for rivers with variable flow regimes. For floodplain rivers the major unifying conceptual model linking hydrology, biogeochemistry and ecology is the Flood Pulse Concept (FPC). The model is based on rivers that have a seasonally predictable and long duration inundation of floodplain habitats. Recent reviews of the FPC indicate that the model needs to be broadened to describe the function of rivers with more variable flow regimes. This project will test some of th ....Testing the Flood Pulse Concept for rivers with variable flow regimes. For floodplain rivers the major unifying conceptual model linking hydrology, biogeochemistry and ecology is the Flood Pulse Concept (FPC). The model is based on rivers that have a seasonally predictable and long duration inundation of floodplain habitats. Recent reviews of the FPC indicate that the model needs to be broadened to describe the function of rivers with more variable flow regimes. This project will test some of the predictions of the FPC for variable dryland rivers by investigating how food webs in the channels of a floodplain reach respond to flows of different magnitude, seasonal timing and duration.Read moreRead less
Establishing an ecological basis for stocking density of Australian bass in freshwaters: Experimental field tests of a general numerical model. Large numbers of the Australian public go fishing, particularly in rivers and impoundments. Angling in these waterways provides a strong source of income for rural and regional communities. The stocking of native fish to support inland angling also sustains much of the aquaculture industry in western NSW and Queensland. This study will develop an optimal ....Establishing an ecological basis for stocking density of Australian bass in freshwaters: Experimental field tests of a general numerical model. Large numbers of the Australian public go fishing, particularly in rivers and impoundments. Angling in these waterways provides a strong source of income for rural and regional communities. The stocking of native fish to support inland angling also sustains much of the aquaculture industry in western NSW and Queensland. This study will develop an optimal approach to stocking Australian bass which is relevant for other stocked freshwater species, and will allow stocking to be undertaken in an environmentally responsible manner. This will both enhance the outcome of investment of public funds in stocking, and enhance the recreational fishing experience that is so important to rural regional communities.Read moreRead less
Fine-scale responses of freshwater fish to environmental flows in arid-zone rivers and wetlands. The community is demanding that river health be improved to sustainable levels through increased river flows. This will come through the efficient use of available environmental water that supports the ecology of Australia's river systems. This project will substantially inform the operational management of water for native fish populations and other organisms to specific wetlands and will guide the ....Fine-scale responses of freshwater fish to environmental flows in arid-zone rivers and wetlands. The community is demanding that river health be improved to sustainable levels through increased river flows. This will come through the efficient use of available environmental water that supports the ecology of Australia's river systems. This project will substantially inform the operational management of water for native fish populations and other organisms to specific wetlands and will guide the delivery of environmental flows to maintain native fish stocks. The project will help management of declining fish populations and more generally wetlands by improving our understanding of the role of environmental flows.Read moreRead less
Molecular biosignatures for isolating pollution problems in aquatic ecosystems using macroinvertebrate bioindicators. Aquatic ecosystems are under increasing threat by human activities. This has been further exacerbated by drought and climate change. In the future, understanding the major factors impairing aquatic ecosystems will be a vital part of sustaining water resources. This project develops new molecular tools to better monitor and assess aquatic pollution. We will develop a new high-tech ....Molecular biosignatures for isolating pollution problems in aquatic ecosystems using macroinvertebrate bioindicators. Aquatic ecosystems are under increasing threat by human activities. This has been further exacerbated by drought and climate change. In the future, understanding the major factors impairing aquatic ecosystems will be a vital part of sustaining water resources. This project develops new molecular tools to better monitor and assess aquatic pollution. We will develop a new high-tech deoxyribonucleic acid (DNA) approach to identify insect indicator species and combine this with a field-based microcosm method that uses local aquatic insects to isolate pollution effects from other impacts. This proposal will facilitate fast identification of pollution problems and provide the water industry with an innovative means to assess pollution and monitor remedial actions.Read moreRead less
Mining, irrigation, and groundwater: Towards a reliable protocol for assessing the impacts of extraction on groundwater fauna and ecology. Groundwater fluctuations associated with mining and increased irrigation demands, potentially threaten many of Australia's unique groundwater invertebrates (stygofauna) with extinction. Stygofauna represent a hidden store of biodiversity and are thought to have a critical, but poorly understood, role in enhancing groundwater quality. Environmentally sustainab ....Mining, irrigation, and groundwater: Towards a reliable protocol for assessing the impacts of extraction on groundwater fauna and ecology. Groundwater fluctuations associated with mining and increased irrigation demands, potentially threaten many of Australia's unique groundwater invertebrates (stygofauna) with extinction. Stygofauna represent a hidden store of biodiversity and are thought to have a critical, but poorly understood, role in enhancing groundwater quality. Environmentally sustainable development of groundwater resources is hampered by a dearth of information on the ecological needs of stygofauna and how they respond to human-induced change. Using field and laboratory experiments, we aim to determine how water table fluctuations threaten stygofauna. From our results we will develop sampling and management protocols to monitor and protect stygofauna communities.Read moreRead less
How does forestry impact headwater streams? Although headwater streams make up much of the catchment of rivers, the effects of forestry on instream species composition, habitat types, and ecosystem functions remain uninvestigated. We aim to fill these three gaps so that managers can: 1. determine whether stream side buffers are necessary and 2. identify which species and ecosystem functions are the most sensitive and reliable variables for future monitoring of instream ecosystem health.
Early warning of cyanobacteria blooms in drinking water reservoirs by means of evolutionary algorithms. Estimated economic cost of cyanobacteria blooms to Australia are at $150 million p.a. Early warning for cyanobacteria blooms will inform water managers to conduct preventive and operational control in reservoirs and water works, and significantly lower risks for public health and costs for monitoring and treatment. Resulting early warning systems will be novel prototypes for cyanobacteria bloo ....Early warning of cyanobacteria blooms in drinking water reservoirs by means of evolutionary algorithms. Estimated economic cost of cyanobacteria blooms to Australia are at $150 million p.a. Early warning for cyanobacteria blooms will inform water managers to conduct preventive and operational control in reservoirs and water works, and significantly lower risks for public health and costs for monitoring and treatment. Resulting early warning systems will be novel prototypes for cyanobacteria blooms in drinking water reservoirs based on forecasting models adaptable to environmental and climate change. Model-based scenario analysis will also assist in informed decisions on effects of drought, injection of recycled water and global warming to cyanobacteria growth.Read moreRead less
The impact of endocrine disrupting compounds (EDCs) in sewage contaminated waters on aquatic biota and identification of the causative compounds. The project's aims are to determine a) the impact of endocrine disrupting compounds (EDCs) such as contraceptive pills and detergents in sewage effluent on aquatic biota; and b) which EDCs contribute to the impact. This project will provide the first comprehensive assessment of whether EDCs are causing effects in rivers downstream of sewage treatment p ....The impact of endocrine disrupting compounds (EDCs) in sewage contaminated waters on aquatic biota and identification of the causative compounds. The project's aims are to determine a) the impact of endocrine disrupting compounds (EDCs) such as contraceptive pills and detergents in sewage effluent on aquatic biota; and b) which EDCs contribute to the impact. This project will provide the first comprehensive assessment of whether EDCs are causing effects in rivers downstream of sewage treatment plants and will identify the chemicals responsible. New biological tests for detecting endocrine disruption will also be developed for research and commercial use. The findings will assist regulatory bodies and water service providers to develop appropriate legislative, management and technological strategies to minimise EDC impacts on ecosystem health.Read moreRead less
Ecological renovation of constructed wetlands: changing state from algae to macrophyte dominated systems. Mars Confectionary's constructed wastewater treatment wetlands no longer purify its waste waters. Over-burdening has tipped the balance from a plant dominated, clear water system to an algae dominated, turbid system. This project will aid restoration of the Mars wetlands by (1) improving our understanding of alage-macrophyte dynamics in shallow water basins; (2) producing a series of soft en ....Ecological renovation of constructed wetlands: changing state from algae to macrophyte dominated systems. Mars Confectionary's constructed wastewater treatment wetlands no longer purify its waste waters. Over-burdening has tipped the balance from a plant dominated, clear water system to an algae dominated, turbid system. This project will aid restoration of the Mars wetlands by (1) improving our understanding of alage-macrophyte dynamics in shallow water basins; (2) producing a series of soft engineering, ecologically based techniques for the management / rehabilitation of natural and constructed shallow water bodies which receive high nutrient loads; (3) improve decision support tools for the renovation and sustainable management of the Mars Confectionary, and similar food processing industry constructed wetlands.Read moreRead less
Complex system dynamics: restoring riparian and riverine ecosystems. Attempts to restore damaged ecosystems reveal inadequacies in theories describing ecosystem structure and function. For rivers, it is unclear whether theories relating to fluvial geomorphology and ecosystem dynamics are adequate to predict system trajectories following restoration. We will use empirical data on a degraded river to develop cross-scale models of system function, and predict ecosystem structure and dynamics follow ....Complex system dynamics: restoring riparian and riverine ecosystems. Attempts to restore damaged ecosystems reveal inadequacies in theories describing ecosystem structure and function. For rivers, it is unclear whether theories relating to fluvial geomorphology and ecosystem dynamics are adequate to predict system trajectories following restoration. We will use empirical data on a degraded river to develop cross-scale models of system function, and predict ecosystem structure and dynamics following restoration. Following revegetation of riparian habitats and replacement of large woody debris in in-stream habitats of the river, we will test theoretical predictions about changes to physical processes, biotic community assemblage rules and food webs to develop improved ecosystem-based restoration guidelines.Read moreRead less