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Sediment-derived scenarios of wetland status and change, the Lower River Murray, SA. River Murray wetlands changed early in European settlement so the pre-impact conditions are invisible to managers relying on anecdote or monitoring. Baseline conditions of wetlands can be derived from ecological archives preserved in sediments. Fossil diatom assemblages, reflective of past water quality, and other fossils, will be exhumed from sediment sequences to reconstruct wetland conditions. The integration ....Sediment-derived scenarios of wetland status and change, the Lower River Murray, SA. River Murray wetlands changed early in European settlement so the pre-impact conditions are invisible to managers relying on anecdote or monitoring. Baseline conditions of wetlands can be derived from ecological archives preserved in sediments. Fossil diatom assemblages, reflective of past water quality, and other fossils, will be exhumed from sediment sequences to reconstruct wetland conditions. The integration of multiple indicators of the past will generate graphic re-enactments of natural wetland dynamics. These will provide a vision for community and government on-ground managers enabling them to perceive appropriate targets for wetland state and so generate measures to work towards sustainable conditions.Read moreRead less
Retrospective ecological character assessment for a review of Ramsar status of The Coorong, SA. Integrated analyses of the chemical and biological remains contained in the sediments of the Coorong will provide for a reconstruction of ecological change and variability over the last several thousand years. Detailed analyses of the recent sediments will measure how the condition of the Coorong has departed from this natural background and so provide an audit of human impact on the last wetland in t ....Retrospective ecological character assessment for a review of Ramsar status of The Coorong, SA. Integrated analyses of the chemical and biological remains contained in the sediments of the Coorong will provide for a reconstruction of ecological change and variability over the last several thousand years. Detailed analyses of the recent sediments will measure how the condition of the Coorong has departed from this natural background and so provide an audit of human impact on the last wetland in the Murray darling Basin. This evidence will directly inform the determination of the ecological character of this Ramsar listed, national ecological asset and steer its management for a sustainable future. Read moreRead less
Spatial scale of influence of riparian and catchment land use on stream ecosystem health. Human activities at the landscape scale comprise one of the greatest threats to the ecological integrity of river ecosystems. Government and community groups across Australia are making significant efforts in riparian protection and rehabilitation in an attempt to improve the health of degraded waterways but are hampered in their goal to maximise the environmental gains for every dollar or unit effort inve ....Spatial scale of influence of riparian and catchment land use on stream ecosystem health. Human activities at the landscape scale comprise one of the greatest threats to the ecological integrity of river ecosystems. Government and community groups across Australia are making significant efforts in riparian protection and rehabilitation in an attempt to improve the health of degraded waterways but are hampered in their goal to maximise the environmental gains for every dollar or unit effort invested. The proposed research on understanding the spatial scale of influence of land use and the aggregative effects on stream ecosystems will provide a robust framework to assess various options and optimise benefits from management actions. 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
Setting rehabilitation targets for regulated floodplain wetlands: linking system structure and function. Limited understanding of ecosystem processes in floodplain wetlands impedes adaptive management strategies for combating the decline in aquatic productivity and biodiversity. This project addresses three knowledge gaps critical for effective floodplain wetland management: 1) hierarchical spatial and temporal patterns of structural diversity; 2) correspondence between patterns of structural d ....Setting rehabilitation targets for regulated floodplain wetlands: linking system structure and function. Limited understanding of ecosystem processes in floodplain wetlands impedes adaptive management strategies for combating the decline in aquatic productivity and biodiversity. This project addresses three knowledge gaps critical for effective floodplain wetland management: 1) hierarchical spatial and temporal patterns of structural diversity; 2) correspondence between patterns of structural diversity, rates of system production, and food web structure, and 3) conceptual models of relationships between hydrologic regime and wetland structure and function. The project will improve understanding of the impacts of regulation on floodplain wetlands, contribute to adaptive management, and set rehabilitation targets for delivery of environmental flows for ecosystem sustainability.Read moreRead less
Transformations of catchment nutrients in southeast Queensland. Human activity in catchments throughout southeast Queensland has increased nutrient loads in receiving waters. However, until recently there has been a lack of accurate quantification of these loads, and little understanding of their role in stimulating algal blooms. This proposal will examine the links between catchment nutrient inputs to waterways, their transformations and effects on stimulating algal growth in freshwater systems ....Transformations of catchment nutrients in southeast Queensland. Human activity in catchments throughout southeast Queensland has increased nutrient loads in receiving waters. However, until recently there has been a lack of accurate quantification of these loads, and little understanding of their role in stimulating algal blooms. This proposal will examine the links between catchment nutrient inputs to waterways, their transformations and effects on stimulating algal growth in freshwater systems. The outcomes from this research will be information on how catchment nutrients are affecting water quality, thus providing a vehicle for targeting management strategies designed to reduce nutrient loads.Read moreRead less
Overcoming multiple constraints to wetland forest restoration. This project aims to determine the efficacy of different approaches for restoring wetland forests at the landscape scale. The death and decline of Victoria’s wetland forests, crucial habitat for the endangered helmeted honeyeater and Leadbeater's possum, most likely result from modified flooding patterns, low native tree and shrub recruitment and increased competition from understorey plants. The project intends to reinstate a more n ....Overcoming multiple constraints to wetland forest restoration. This project aims to determine the efficacy of different approaches for restoring wetland forests at the landscape scale. The death and decline of Victoria’s wetland forests, crucial habitat for the endangered helmeted honeyeater and Leadbeater's possum, most likely result from modified flooding patterns, low native tree and shrub recruitment and increased competition from understorey plants. The project intends to reinstate a more natural flood regime, planting native species and reducing competition from dense understorey vegetation. In this way, the project aims to test and advance ecological theory, guide wetland restoration and inform management plans for saving Victoria’s iconic fauna.Read moreRead less
New approaches for protecting stream health in temperate Australia: Devising nutrient and salinity guidelines using diatoms. Salinity and nutrient enrichment are the most significant forms of water quality degradation in Australian lowland rivers. This project will identify the biological effect of the water quality pollution and develop new methods for its assessment. Most importantly, through the identification of water quality "thresholds" which result in reduced biodiversity, better guidelin ....New approaches for protecting stream health in temperate Australia: Devising nutrient and salinity guidelines using diatoms. Salinity and nutrient enrichment are the most significant forms of water quality degradation in Australian lowland rivers. This project will identify the biological effect of the water quality pollution and develop new methods for its assessment. Most importantly, through the identification of water quality "thresholds" which result in reduced biodiversity, better guidelines for maintaining stream health will be developed.Read moreRead less
Restoring functional links between riparian zones and streams by enhancing structural retention. This project aims to test whether structural retention, whereby plant detritus (logs, bark, leaves) is trapped and retained within river channels, can offset the impacts caused by widespread clearance of vegetation along river banks, a widespread problem in Australia and the world. Theoretically, retention is a major environmental driver of ecosystem change in rivers, but this has rarely been tested, ....Restoring functional links between riparian zones and streams by enhancing structural retention. This project aims to test whether structural retention, whereby plant detritus (logs, bark, leaves) is trapped and retained within river channels, can offset the impacts caused by widespread clearance of vegetation along river banks, a widespread problem in Australia and the world. Theoretically, retention is a major environmental driver of ecosystem change in rivers, but this has rarely been tested, particularly in a restoration context. The aim of this project is to show that increasing retention results in higher species diversity, thus providing managers with a relatively straightforward method for improving the environmental conditions of rivers, while simultaneously testing three hypotheses about rectifying ecosystem degradation caused by human impacts.Read moreRead less
Restoration trajectories of stream ecosystems degraded by urban stormwater runoff: a large-scale experiment in urban hydrology and stream ecology. This project aims to assess innovative dispersed stormwater retention systems in catchments for protection and restoration of urban streams. It will improve the ecological condition of several study streams and provide scientific support for new policies and practices for urban water management, with multiple environmental and community benefits.