Many already stressed or degraded without major ecological consequences.
Water Research Laboratory
A decade of ecosystem aquatic ecosystems are likely to undergo irreversible changes, research provides unequivocal scientific support for maintain- markedly compromising their capacity to maintain the provision ing the natural flow variability of this arid-zone floodplain river of ecosystem goods and services. Arthington et al. Significant effort climate change manifested over long periods, with slow recovery has gone into creating policy and management strategies to Lake ; Lake et al. Knowledge about the River Murray range of spatial and temporal scales.
This decision coupled outputs from hydrologic models with models of habitat availability for key Some recent Australian examples of aquatic ecosystem riverine and floodplain biota on the basis of published studies science guiding management and expert opinion SRP ; Young et al. Climate change is expected to reduce water avail- tems. This research was underpinned by the following two major ability significantly in the Murray-Darling Basin e. Davis and Koop comprehen- any discernible ecosystem recovery. In always the trigger for phytoplankton blooms in the regulated the Western Australian wheatbelt, more than 1 million hectares rivers of south-eastern Australia.
In these systems, light pene- are affected by salinisation. The replacement of deep-rooted tration and thermal stratification are more important, as recently perennial plants with shallow-rooted annual species has caused confirmed for the regulated River Murray Oliver and Merrick saline watertables to rise, leading to salinisation of the land Anthropogenic salinisation is now so ification, phytoplankton blooms and eutrophication in Australian widespread in this region that it has become a major ecological, aquatic ecosystems.
A proposal for irrigated cotton Walker et al. Although the drains and groundwater pumps to intercept and transport saline proposal required a diversion of only 2.
Federal policy and strategy 1 State policy and strategy 10 Space area of interest, ha Regional intervention and management Large-scale multiple catchment studies Whole catchment studies 10 Majority of funded research projects 1 1 10 Time length of study, years Fig. Diagrammatic representation of the current temporal and spatial scales of research shaded ellipses , showing the disconnection in the scales at which federal, state and regional policy and management open ellipses operate. Although much is known about the causes of salinisation ; Parsons and Thoms Similarly, an ecosystem pro- and effective strategies to reduce the impacts Lovett et al.
The causes for The interplay of pattern and process, or between biotic and abi- this failure are complicated; however, they are strongly related otic components, generates a complex matrix of interactions.
A to social and economic pressures. This dissection can or potential drivers of ecosystem processes and ecosystem be achieved most effectively by employing integrated, multiscale degradation, ii sufficient information for realistic cost—benefit research approaches Dollar et al. Working at smaller analyses and iii identification of holistic, integrated solutions, spatial scales is logistically simpler, ensures sharply focussed which consider major drivers and all ecosystem components.
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An questions and is consistent with the short-term funding models ecosystem approach often is forced by the nature of the prob- applied by governments and granting agencies. However, work- lem, particularly in the case of diffuse or non-linear pressures on ing at smaller scales promotes fragmentation, with researchers a large-scale system. We argue, however, that for all ecological often working in isolation and producing data that are discon- research, the consideration of large-scale ecosystem processes nected in time and space.
Working at larger spatial and temporal ecosystem thinking avoids the inevitable fragmentation, which scales is logistically more difficult, requires addressing of mul- can preclude the integration of diverse knowledge necessary tiple questions and is relatively new to current applied science to guide management solutions. State-of-the-art and long-term and management cultures in Australia. Thus, there has been a monitoring of ecosystem parameters, such as metabolism and major mismatch between the large-scale environmental prob- species richness, integrated at appropriate spatial scales, can lems faced inAustralia and the small-scale, fragmented scientific provide critical information to guide long-term ecosystem stud- knowledge and management strategies available to address them ies and adaptive management; however, this is in its infancy in Fig.
Scale of investments Challenges It is now obvious that the major threats to Australian river River ecosystems can be viewed as interacting systems of biolog- ecosystems climate change, land-use change, decline in water ical, physical and chemical components, operating at multiple quality and water withdrawal all occur at large scales, although scales in time and space and with self-organising properties with many small-scale impacts.
Multi-million dollar invest- e. Allan and Castillo ; Cullen ; Harris However, few large-scale, long-term, multi- more coordinated approach to Ph. The structure of teaching and ; Cullen In , the Council of Australian Gov- research in universities may hamper an ecosystem-science ernments responded with a National Water Initiative COAG approach because funding to staff and research are vertically to address these issues in a coordinated way by the organised within disciplines and schools, whereas ecosystem generation and application of ecosystem science.
Recently, the science demands a structure that integrates horizontally across Commonwealth Environment Research Facilities CERF and traditional disciplines, faculties and institutions. Just as eco- the Marine and Tropical Sciences Research Facility MTSRF system science requires integrated, multidisciplinary research have sought out and funded top-quality science programmes that programmes, education programmes likewise need to attract, have attracted additional funding from other sources, including educate, foster and retain future researchers and managers Land and Water Australia and the National Water Commission.
Scholars of Large-scale projects funded under the Tropical Research and ecosystem science should be encouraged to explore cross- Coastal Knowledge TRaCK and Landscape Logic programmes disciplinary courses in law, policy, hydrology, the natural exemplify the scale and scope required to address landscape- sciences and so forth, while still maintaining a strong depth level, ecosystem-science and management issues; however, these of expertise.
Restoration of Estuaries
Students also need training in how to work in programmes are just beginning and have limited coverage in multidisciplinary teams Likens Thus, most Australian river ecosystems probably will Few Australian organisations are resourced to undertake not be researched and managed as large-scale systems under ecosystem-scale research programmes, leading to the need for existing government initiatives, and the duration of even the cooperation and partnerships. However, collaborative research CERF studies is not guaranteed.
Competition for lim- ited funding is a strong motivator for working in isolation and large, well-funded multidisciplinary research programmes are Research capacity and educational opportunities relatively few inAustralia. At the same time, an appropriate fund- It is of major concern that currently Australia lacks the scientific ing balance must be maintained between investigator-initiated capacity to guide natural-resource management through ecosys- research and large, cooperative research projects. The CERF tem science. A web audit of Australian universities revealed programme is trying to tackle this dichotomy with its mix of that few truly integrated, aquatic-ecosystem science programmes research Hubs, specific projects and fellowships; however, the exist.
However, the importance of ecosystem science is recognised in specific units.
Ecological knowledge is increasing rapidly; however, agement and water policy. These units are mostly offered within development and ecosystem fragmentation are still proceeding environmental science, natural-resource management and envi- apace. There is significant failure to protect the condition of the ronmental engineering degrees.
These isolated offerings must be environment because of the inability of managers to integrate enhanced and expanded to provide integrated ecosystem-science complex ecosystem science within the current policy and man- programmes. This deficiency is often due to resource and Integrated graduate and masters programmes, in particular, time constraints on management, and it is also a capacity issue.
It is well recognised that Ph. Clearly, management solutions are much ever, the relatively short duration 3. Lawton Ecosystem scientists are only beginning to problems. This constraint could be overcome by embedding feel empowered to respond within a management context. The Ph. In addition, there and the Experimental Lakes Area Canada. Historically, Ph. Now, given the severity of thresholds in the dynamics of the systems in question.
There is a need for a significant cultural change to make outcomes has focussed on environmental water requirements, progress — both within management agencies and within research for which even the conceptual scientific basis has been largely organisations. First, managers must become more aware of the aspirational and with limited evidence Arthington et al. Harris More recently, funding programmes have focussed Managers need to design policy and management tools from around aspirations for ecosystem restoration Lake et al. Ecosystem scientists need to have These areas have had a substantial community profile during a greater sensitivity to and engagement in management issues the past decade, although accompanied by fragmented and weak and need training in science communication and in environ- policy developments.
The focus has often been on developing mental policy. ANZECC , and protocols for assessment teamed with ecosystem scientists within agencies and policy- and reporting. The articulation of quantifiable goals, focussed development units. Above all, managers and scientists need to on specific, measurable ecosystem responses and outcomes, has define realistic, quantifiable goals for ecosystem management, been poor.
This situation is improving slowly, especially in the and develop a fuller integration of ecosystem-based knowl- area of environmental water allocation Arthington and Pusey edge into policy and management action. These needs are more ; Poff et al. Close engagement between managers and science to underpin management has been very small relative to ecosystem scientists must become standard practice. In addition, many environmental ii statutory provision for environmental and other public ben- management programmes are based around goals that are not efit outcomes and iii improved environmental management specific and realistic, but tend to be aspirational.
Although practices. We also advocate that researchers surable outcomes. For example, with the flooding of floodplains, seek opportunities to integrate and synthesise significant bodies we now have specific outcomes such as primary and secondary of multidisciplinary, long-term research at multiple spatial and production, invertebrate and fish recruitment, and waterbird temporal scales. The facility to move freely across scales and dis- breeding success.
Conclusions and recommendations Without specific and realistic goals, which reflect how ecosys- The condition of Australian aquatic ecosystems, the magnitude tems function and respond to management intervention, even of the threats they face and the power of ecosystem science to large investments in ecosystem management and restoration present holistic understanding and management solutions, pro- such the National Water Initiative or the Forward Work Pro- vide an ineluctable case for greater focus on ecosystem science gram on Water COAG are likely to fail or at best be in Australia.
However, with a few exceptions, we lack both the inefficient in delivering outcomes. Our concern is that a failure to increase the government creates a need for knowledge from ecosystem sci- geographic extent and coordination of collaborative, multidis- ence within which operational goals have relevance to ecosystem ciplinary, ecosystem science in Australia will oblige managers outcomes, rather than just servicing policy and management to continue to demand and be given instant answers to natural process.
There has been a lim- agement practices. There is a need to shift both science and ited demand for ecosystem science in the water-management management from reactionary problem solving to strategic prob- arena in Australia — historically much of aquatic science has lem solving, with sufficient knowledge to avoid problems or focussed around the implications of changes in water quality address them properly should they arise.
Much of water-quality research has focussed on management in Australia — one that can capture the skills, knowl- toxicology, which has had limited input from ecosystem think- edge and innovation of our research community and direct them ing. The meeting was convened by G. Likens continent.
The meeting was facilitated by J. We thank two anonymous reviewers for coordinated research funding policy and structure to foster helpful comments. Australian and New Zealand Environment and Organisation.
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Flow restoration and protec- ting, planning and management action by a combination tion in Australian rivers.