аЯрЁБс>ўџ 68ўџџџ5џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџьЅС%` №Пѕbjbj"x"x ."@@ѕ џџџџџџЄhhhhhhh|    $ |dXD D D D D    ухххххх$Мh$b h   hhD D лггг^hD hD угуггhhгD 8 рч.ЫvЩ y"гП$40d㆛"†гг†hчи ц ЄгЉ „- ю    Н   d||$ „$ф|| $|||hhhhhhџџџџ ELOHA down under: ecological limits of hydrological alteration by dams in south-eastern Queensland, Australia. Angela Arthington, Australian Rivers Institute, Griffith University, Brisbane, Queensland 4111, Australia. Extended Abstract Deciding the quantity, quality and timing of flows needed to sustain the ecological values, goods and services of a particular river system is a major challenge for scientists and water managers, especially where there are competing demands for freshwater. Much of eastern Australia is experiencing the worst drought in 100 years and many cities are enduring stringent water restrictions. In south-eastern Queensland the dwindling supply of freshwater held in large storage reservoirs has stimulated planning of an immense water grid to connect existing and new reservoirs and to access other sources of water that will secure supplies for the next 50 years. One of its guiding principles is to ensure the health of catchments, aquifers and their ecosystems by providing environmental flows. This paper provides a brief summary of an ecological research program designed to inform environmental flow management in this region, entitled “Hydro-Ecological Relationships and Thresholds to Inform Environmental Flow Management and River Restoration: Site Selection and Field Sampling Procedures”. It is designed to investigate relationships between degrees and types of flow regulation and ecological responses of river systems from the Mary River in the north to the Nerang River in the south of the region. The approach being taken in this study follows the steps outlined in Arthington et al. (2006), and further developed in the new environmental flows framework called ELOHA (Ecological Limits of Hydrological Alteration – Poff et al. 2008 submitted). The habitat, water quality and ecological consequences of contrasting types and degrees of flow regulation by existing dams and weirs are being studied, with focus on riparian and aquatic vegetation, fish and the structure and drivers of aquatic food webs. From this study it is anticipated that linear and threshold responses to existing flow regulation will be discovered, but that they are likely to differ from one hydrological river class to another, or even from river to river, according to the particular characteristics of the ‘natural’ flow regime, the geomorphological setting and the type of flow regulation. The outcomes of this project will help to inform the development of environmental flow guidelines and flow restoration targets for rivers of distinctive hydrological type, or for individual rivers. Literature Cited Arthington, Angela H., Stuart E. Bunn, N. LeRoy Poff, Robert J. Naiman (2006). The challenge of providing environmental flow rules to sustain river ecosystems. Ecological Applications 16 (4): 1-10. Poff, N. LeRoy, Brian Richter, Angela H. Arthington, Stuart Bunn, Robert J. Naiman, Colin Apse, Eloise Kendy, Andrew T. Warner, Rebecca Tharme, Brian P. Bledsoe, David Merritt, Robert B. Jacobson, Mary Freeman, Kevin Rogers, James Henriksen, Julian Olden, Jay O’Keeffe, Mike Acreman 2009. The Ecological Limits of Hydrologic Alteration (ELOHA): A Framework for Developing Regional Environmental Flow Standards. 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