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This position paper sets out to examine value creation in the engineering enterprise, a process that has mostly been associated with innovation and entrepreneurs. An analysis of the literature on engineering value creation in business studies, engineering and engineering education publications shows that there has been surprisingly little empirical study and thus the means by which most engineers contribute value is unclear in the literature. Analysis of published data and data from studies by the authors in engineering workplaces in Australia, South East Asia and Portugal suggests that the work performed by most engineers has little to do with innovation. Based on these data the authors identify 14 ways in which engineers create value. An important finding is that routine engineering performances by a majority of engineers, not associated with innovation or entrepreneurial activities, not only can be shown to create value, but also to protect accumulated value from inadvertent destruction. The paper outlines the educational implications of these findings and proposes measures that engineering educators can adopt to improve the understanding of engineering graduates about engineering value creation.

Despite the essentiality of freshwater to all life on the planet, the populous has inadequate understandings of water. Formal education plays a key role in shaping how individuals and communities make sense of water, its accessibility, management, consumption, and hazards. This article seeks to bring attention to the infuence of cultural framings of freshwater and extreme freshwater events (such as food and drought) in government-mandated school curricula in two water-vulnerable geographical regions of Australia and Canada. We seek to identify and respond to hegemonic social constructions that become naturalised if left unexamined. By examining the agendas and language around freshwater and extreme freshwater events in formal educational curricula, we gain a better understanding of the perceptions and assumptions made about freshwater. The results highlight that freshwater and extreme freshwater events are minimally conceptualised within these curricula as 'nature-based', rather than being part of a dialectical relationship with societal agendas and practices. This article discusses the implications of this framing and the psychological barriers that may affect the acknowledgment and investigation of extreme freshwater events. We conclude by offering curricular suggestions that invite community-based understandings of the dialectic relationship freshwater has with communities and regional ecosystems.

There is on-going international interest in the relationships between assessment instruments, students' understanding of science concepts and context-based curriculum approaches. This study extends earlier research showing that students can develop connections between contexts and concepts--called "fluid transitions"--when studying context-based courses. We provide an in-depth investigation of one student's experiences with multiple contextual assessment instruments that were associated with a context-based course. We analyzed the student's responses to context-based assessment instruments to determine the extent to which contextual tests, reports of field investigations, and extended experimental investigations afforded her opportunities to make connections between contexts and concepts. A system of categorizing student responses was developed that can inform other educators when analyzing student responses to contextual assessment. We also refine the theoretical construct of "fluid transitions" that informed the study initially. Implications for curriculum and assessment design are provided in light of the findings.

Using a participatory learning approach, we report on the delivery and evaluation of a climate change and risk assessment tool to help manage water risks within the agricultural sector. Post-graduate water-professional students from a range of countries, from both developed and emerging economies were involved in using this tool. Our approach included participative learning tools--group discussion, software, and risk matrices. The materials developed met the needs of the students, allowing these students to incorporate their learning and adapt the package of materials for use in their home countries. Analysis of evaluations show that the tools and materials are particularly useful and emphasizes the need for sound learning materials and tools, funding to deliver training, and policy support to accelerate education and adoption of authentic climate change adaptation practices. The expected benefits for water professionals about climate change will be translated into improved socioeconomic and environmental outcomes if adopted.

Purpose: This paper aims to report on case-study research that explores the role of leadership practices, in particular, in enhancing the capacity of an enterprise to learn to create new value from a diverse range of sources. The capacity to sustain value creation over time, and across turbulent environments, increasingly differentiates enterprise performance. Under the umbrella term of "dynamic capabilities", a range of practices have been identified in the literature as contributing to an enterprise's ability to learn to perform this task successfully. Design/methodology/approach: The paper is based on case studies of three enterprises whose founders have sustained the creation of new value for customers over decades. Through a series of unstructured interviews with each founder, the tacit knowledge gained from years of learning how to create, and re-create, value, is made explicit through hermeneutic analysis of the interview transcripts. Findings: The data identify four key areas of leadership practice that underpin the capacity to learn to continuously create new value over significant periods of time. The most important of these are the social practices that generate and leverage the intangible capital resources (in particular, the resource of trust) that underpin the collaborative learning on which value creation processes depend. Research limitations/implications: As interpretive research, the knowledge accessed through this research is context-dependent and cannot be readily generalised. The validity of the knowledge is high, however, as the epistemological and ontological assumptions of the interpretive research paradigm recognise the political nature of organisations and, thus, of learning and value creation. As such, the knowledge generated by the case analyses offers a rich alternative perspective on the issue under research. Practical implications: The cases illuminate the nature of learning that supports continuous value creation in enterprises. Such learning is framed by several leadership practices that enable the self-reflexivity that underpins the continuous conversion of action-generated tacit knowledge into more strategically useful explicit knowledge. At the core of these leadership practices is stakeholder collaboration and intellectual humility. Social implications: The results show that learning to create sustainable value over time and diverse contexts, has a socio-political dimension in that it depends heavily on generating and leveraging the intangible resources (such as trust, commitment, ideas) that reside within social relationships. Originality/value: The research is located within the interpretive research paradigm and thus offers an alternative view to that of conventional positivist research. Furthermore, the results indicate that learning is a strategic priority in rapidly changing environments and, thus, is a key leadership responsibility. Furthermore, the results show that value creation is a collaborative stakeholder achievement.

Access to clean drinking water is a major problem for many people across the world. Desalination is being increasingly used in many countries to provide this important resource. Desalination technology has received varying degrees of support in the communities in which this technology has been adopted. Productive communication suggests we understand the views of both "interested publics" and the views of water experts about these "interested publics". In this paper, we analyse the views of 16 water scientists involved in desalination research projects. We used a fourfold science communication typology to analyse scientists' discourse. While most participants expressed views which can be summarised as "We just need to educate the public," there are glimpses of more thoughtful approaches which could lead to more productive interaction between water experts and "interested publics".

Curriculum developers and researchers have promoted context-based programmes to arrest waning student interest and participation in the enabling sciences at high school and university. Context-based programmes aim for student connections between scientific discourse and real-world contexts to elevate curricular relevance without diminishing conceptual understanding. This interpretive study explored the learning transactions in one 11th grade context-based chemistry classroom where the context was the local creek. The dialectic of agency/structure was used as a lens to examine how the practices in classroom interactions afforded students the agency for learning. The results suggest that first, fluid transitions were evident in the student-student interactions involving successful students; and second, fluid transitions linking concepts to context were evident in the students' successful reports. The study reveals that the structures of writing and collaborating in groups enabled students' agential and fluent movement between the field of the real-world creek and the field of the formal chemistry classroom. Furthermore, characteristics of academically successful students in context-based chemistry are highlighted. Research, teaching, and future directions for context-based science teaching are discussed. (Contains 1 table,)

Increasingly, partnerships and other cooperative forms of governance are common-place in addressing problems of environmental management in rural landscapes. These forms of governance are multi-dimensional in the policy instruments employed; the make-up of actors; and, the types of rationalities that actors use to debate the problem and proposed solutions. This paper pursues the question of how different modes of social action, represented in argumentative claims of participants, influence social coordination in these governance arenas. An empirical study is presented of agri-environmental governance in Australia where actors debate planning and policy initiatives to reduce diffuse water quality impacts from farms on the adjacent Great Barrier Reef. Forester's conceptualisation of practical social action which locates communicative action in the "real world" of interest-based planning contexts, is used as an analytical frame to identify: (i) the type of claims made by governments, farmer groups and other actors in argumentation; (ii) the claims association with communicative, strategic and instrumental modes of action; and, (iii) their consequence for social coordination in formation and maintenance of inclusive, legitimate and viable forms of governing. The study finds that the interconnected character of claims made by actors, and the ready switching between modes of action observed, point to a situated and dynamic expression of rationality within these contested and prolonged debates on how to legitimately and effectively govern rural environments. (Contains 1 table.)

In this article we present the results from an exploratory study conducted in the Wet Tropics in Australia. The study was initiated as part of a larger research program to support the development of a water quality improvement plan. Seven schools were invited to participate in this study. Students were asked to develop visions for the future of their local area. Results suggest that integrating a futures perspective into formal educational programs provides a mechanism to connect students with their local community and their local environment, and at the same time, encourages critical thinking and environmental citizenship beyond the classroom. (Contains 1 table and 4 figures.)

Purpose: The purpose of this paper is seek to characterise sustainable attitudes and behaviours (including recycling and waste minimisation, energy efficiency, water conservation and "green" purchasing) amongst non-academic staff within Griffith University, Queensland. Design/methodology/approach: For this study, the attitudes and behaviour of 100 individuals from a cross-sectional sample from a single Department, along with the determinants of pro-environmental behaviours were investigated. The survey tool administered used the theory of planned behaviour (TPB) and was delivered via an online survey, which was e-mailed directly to all participating staff across Griffith's five campuses. Findings: The research sought to pilot the use of the TPB to determine sustainable behaviours amongst staff. The survey successfully showed that the TPB was effective at determining staff attitudes and behaviours and determined that staff were overall satisfied with the current efforts by Griffith University to become more sustainable. However, a number of barriers were identified that should be addressed in order to more comprehensively incorporate sustainability into the work environment. Significant differences in opinions were more prevalent amongst various demographic groups rather than between other characteristics such as department/function. Originality/value: The TPB has been widely adopted to determine both waste minimisation and recycling behaviours amongst householders. This is a new focus for the tool, to determine if it can accurately determine a suite of additional attitudes and behaviours associated with sustainability and why these differences occur. (Contains 7 tables.)

Interest and participation in science in schools has been declining for many years and there is a genuine need to rejuvenate interest in science at the high school level. One possible solution is the completion of challenging science projects which fulfill an authentic purpose in the community. This paper discusses the results of ongoing research into the establishment of a rural and regional Science Challenge which makes use of partnerships with local industries and community groups to encourage the development of authentic science projects. In the development of the Science Challenge, many issues are emerging in relation to teachers' work, resources, administration and school cultures. This paper reports on the preliminary findings and indicates directions for the future. (Contains 4 tables.)

This paper reports on the outcomes of a pilot project to support secondary teachers of science in rural and regional Tasmania. The pilot project involved eight regional schools and was based on the provision of a kit of materials and an associated learning program that used brine shrimp or "sea-monkeys" to test for water quality. The unit was developed as one of a number of small projects organised by the Tasmanian SiMERR Hub. It involved collaboration between staff from two faculties at the University of Tasmania (UTAS): the Faculty of Science and the Faculty of Education. Two local secondary teachers were seconded to develop the teaching materials. The outcomes of the project were that, while the teachers appreciated the resource materials, there were some barriers which reduced the effectiveness of this approach to supporting the professional development (PD) of teachers. The findings are then considered in the context of relevant literature concerning teacher PD and the effective use of Information and Communication Technology (ICT) to support the PD of teachers in rural and regional areas. (Contains 1 table.)

This article provides some stories of primary school teachers' and students' experiences of implementing new science teaching and learning strategies through an action research process that have also led to more environmental education occurring in the schools' curriculum. The stories have been constructed from the coordinators' journals, observations and interviews with the teachers and students in the schools. The teachers in the schools are consciously engaged in an action research-based model of curriculum change in science teaching and learning. The stories also acknowledge the critiques of critical theory in environmental education and the possibilities for a socially critical approach in environmental education within a context of the limited opportunities for both science and environmental education in primary schools. (Contains 2 tables, 1 figure and 4 notes.)

Compliance with many agri-environmental programs fails to meet expectations due to enforcement difficulties. One response has been devolution of enforcement rights and responsibilities to industry organisations. This kind of response is based on a belief that farmers cooperate more with their industry organisations than with government in ensuring compliance, both in terms of sanctioning one another's compliance and supporting their organisations in providing third-party sanctioning. A case study involving complementary use of qualitative and quantitative research methods was undertaken to assess this belief. The case involves farmers in the central-Murray region of New South Wales in Australia faced with potentially worsening problems of irrigation salinity and waterlogging. Their jointly owned irrigation company has been devolved responsibility for enforcing implementation of collective action plans the farmers have developed and agreed to carry out. The case study revealed "inter alia" that the farmers are more prepared to support sanctioning from their company than they would be from government, but that--at least at this early stage of the implementation process--they remain reluctant to directly punish one another's non-compliance through peer pressure or other informal mechanisms.

Managers and decision-makers are under increasing pressure to engage community members along with experts in considering and resolving environmental degradation. This is especially the case with respect to decisions concerning water quality and quantity in Australia. The commitment of citizens and government to sustainable catchment management and their willingness to participate actively in an authentic and inclusive decision-making process is critical to ensuring a healthy future complete with clean and sufficient water supply. This process must involve social learning by all stakeholders because "we all use water." Indeed, the water crisis stems from all of our lifestyle choices (Robinson, 2001). This article examines a national workshop series conducted collaboratively by research, industry, and community organizations during 2002 to foster informed community involvement in environmental decision-making. This reflective case study articulates the rationale for the workshop series and lessons learned. Two main themes shape the discussion: professional development for water educators, and an informed and engaged community. (Contains 3 footnotes.)

Introduces a teaching strategy for Year 10 and senior biology students to demonstrate food and energy processes along a river ecosystem. In studying the River Continuum Concept, groups of students undertake a series of interrelated projects as a means of understanding the big picture of the food and energy interrelationships evident in healthy functioning ecosystems. Also includes sample hypotheses and support materials. (PVD)

"Teaching Science" has, as one of its predecessors, the "Investigating" journal, which first appeared in 1988. Looking back ten years, the winner of the "Most Valuable Paper Award" for 1999 was Kimberley Pressick-Kilborn for her article--"Steps to Fostering a Learning Community in the Primary Science Classroom". In this edition of "Teaching Science" we revisit Kimberley's article, describing a Year Three class that becomes part of a knowledge building community as they investigate ways to assess water quality. (Contains 3 figures.)

Long-term declines in coastal water quality and sedimentation can affect the restoration success of ecosystems such as seagrass and shellfish reefs. Resnagging coastal seascapes offers a potential alternative restoration method that is not reliant on abiotic conditions and which may enhance degraded landscapes for fish and fisheries. While common in freshwater ecosystems, such interventions are unusual for coastal seascapes despite log snags supporting significant benefits for coastal fish. In this study, we identify the spatial (e.g. seascape connectivity), habitat condition (e.g. log snag complexity and food availability) and water quality variables that best explain variation in fish assemblages on log snags to help prioritise the placement and design of resnagging efforts in estuaries. We surveyed fish assemblages on log snags using underwater videography at 363 sites across 13 estuaries in southeast Queensland, Australia, over 3 years. Sites less than 10,000 m from the estuary mouth, more than 2500 m from urban structures and located in water depths of < 3 m harboured more diverse fish assemblages. Sites less than 10,000 m from the estuary mouth with lower (< 25%) algae cover harboured greater total fish abundance and harvested fish abundance. Similar trends were found for the abundance of individuals from key functional groups, although these trends were mediated by other seascape contexts (e.g. the area of natural habitat) and water quality variables (e.g. chlorophyll-a concentration and dissolved oxygen saturation). Our results indicate that log snag placement in estuaries for benefits to fish and fisheries can be maximised if sites are planned strategically. [ABSTRACT FROM AUTHOR]

Over the past decade, escalating extreme weather events have significantly affected New South Wales (NSW), Australia, with unprecedented droughts and intense fires. Yet, the impact on water quality and purification processes remains insufficiently studied. This research focuses on the immediate changes in NSW's environmental water quality and issues in water purification unit operations following the 2019 bushfires. Water samples and maintenance records from affected catchments, intakes, purification units, and reservoirs were analysed. Compared to control samples, post-bushfire water exhibited high turbidity. Sediment and ash shock loads posed significant threats to aquatic ecosystems. Elevated turbidity, suspended sediments, pH, and alkalinity were major concerns for water purification. Raw water samples showed turbidity exceeding 195 NTU, with flocculation and sedimentation most impacted. Immediate measures included sediment traps, aeration, pre-chlorination, and inline monitoring. These findings inform strategies to mitigate bushfire impacts on water quality and optimise water purification in fire-prone regions. [ABSTRACT FROM AUTHOR]

The estimation of water quality properties through satellite remote sensing relies on (1) the optical characteristics of the water body, (2) the resolutions (spatial, spectral, radiometric and temporal) of the sensor and (3) algorithm(s) applied. More than 80% of global water bodies fall under Case I (open ocean) waters, dominated by scattering and absorption associated with phytoplankton in the water column. Globally, previous studies show significant correlations between satellite-based retrieval methods and field measurements of absorbing and scattering constituents, while limited research from Australian coastal water bodies appears. This study presents a methodology to extract chlorophyll a properties from surface waters from near-coastal environments, within 2 km of coastline, in Tasmania, south-eastern Australia. We use general purpose, global, long-time series, multi-spectral satellite data, as opposed to ocean colour-specific sensor data. This approach may offer globally applicable tools for combining global satellite image archives with in situ field sensors for water quality monitoring. To enable applications from local to global scales, a cloud-based geospatial analysis workflow was developed and tested on several sites. This work represents the initial stage in developing a semi-automated near-coastal water-quality workflow using easily accessed, fully corrected global multi-spectral datasets alongside large-scale computation and delivery capabilities. Our results indicated a strong correlation between the in situ chlorophyll concentration data and blue-green band ratios from the multi-spectral sensor. In line with published research, environment-specific empirical models exhibited the highest correlations between in situ and satellite measurements, underscoring the importance of tailoring models to specific coastal waters. Our findings may provide the basis for developing this workflow for other sites in Australia. We acknowledge the use of general purpose multi-spectral data such as the Sentinel-2 and Landsat Series, their corrections and algorithms may not be as accurate and precise as ocean colour satellites. The data we are using are more readily accessible and also have true global coverage with global historic archives and regular, global collection will continue at least 10 years in the future. Regardless of sensor specifications, the retrieval method relies on localised algorithm calibration and validation using in situ measurements, which demonstrates close-to-realistic outputs. We hope this approach enables future applications to also consider these globally accessible and regularly updated datasets that are suited to coastal environments. [ABSTRACT FROM AUTHOR]

In this paper, we analyse the uncertainty and parameter sensitivity of a conceptual water quality model, based on a travel time distribution (TTD) approach, simulating electrical conductivity (EC) in the Duck River, Northwest Tasmania, Australia for a 2‐year period. Dynamic TTDs of stream water were estimated using the StorAge Selection (SAS) approach, which was coupled with two alternate methods to model stream water EC: (1) a solute‐balance approach and (2) a water age‐based approach. Uncertainty analysis using the Differential Evaluation Adoptive Metropolis (DREAM) algorithm showed that: 1. parameter uncertainty was a small contribution to the overall uncertainty; 2. most uncertainty was related to input data uncertainty and model structure; 3. slightly lower total error was obtained in the water age‐based model than the solute‐balance model; 4. using time‐variant SAS functions reduced the model uncertainty markedly, which likely reflects the effect of dynamic hydrological conditions over the year affecting the relative importance of different flow pathways over time. Model parameter sensitivity analysis using the Variogram Analysis of Response Surfaces (VARS‐TOOL) framework found that parameters directly related to the EC concentration were most sensitive. In the solute‐balance model, the rainfall concentration Crain and in the age‐based model, the parameter controlling the rate of change of EC with age (λ) were the most sensitive parameter. Model parameters controlling the age mixes of both evapotranspiration and streamflow water fluxes (i.e., the SAS function parameters) were influential for the solute‐balance model. Little change in parameter sensitivity over time was found for the age‐based concentration relationship; however, the parameter sensitivity was quite dynamic over time for the solute‐balance approach. The overarching outcomes provide water quality modellers, engineers and managers greater insight into catchment functioning and its dependence on hydrological conditions. [ABSTRACT FROM AUTHOR]

In their recent paper, Williams et al. (2022) evaluated salinity management in the Murray-Darling Basin (MDB) as 'unsustainable', and a risk to water availability and quality in the Basin. However, this evaluation was weakened first by a failure to analyse the Basin salinity strategies of the last thirty-five years, noting that these have led to Basin salinity target being met since 2010; and second to not providing Basin-specific data to support their evaluation. Contrary to Williams et al. comments, existing evidence indicates that infrastructure intended to improve water use efficiency (e.g. salt leaching, salt disposal basins) will generally reduce stream salinity. The requirement for a leaching efficiency means that there is a lower limit to water use efficiency improvements, but this is unlikely itself to be a major risk. We agree that the changes that have occurred over the last twenty years would warrant a review of salt storage options in the MDB that better matches future needs. [ABSTRACT FROM AUTHOR]

Drones are revolutionising earth system observations, and are increasingly used for high resolution monitoring of water quality. The objective of this research was to test whether drone-based multispectral imagery could predict important water quality parameters in an ICOLL (intermittently closed and opened lake or lagoon). Three water quality sampling campaigns were undertaken, measuring temperature, salinity, pH, dissolved oxygen (DO), chlorophyll (CHL), turbidity, total suspended sediments (TSS), coloured dissolved organic matter (CDOM), green algae, crytophyta, diatoms, bluegreen algae and total algal concentrations. DistilM statistical analyses were conducted to reveal the bands accounting for the most variation across all water quality data, then linear correlations between specific band/band ratios and individual water quality parameters were performed. DistilM analyses revealed the NIR band accounted for most variation in March, the Green band in April and the RE band in May, and showed that the most important contributors varied significantly among campaigns and variables. Significant linear correlations with R2 > 0.4 were obtained for eleven of the water quality parameters tested, with the strongest correlation obtained for CHL and the green band (R2 = 0.72). The relative importance of predictor bands and observed water quality parameters varied temporally. We conclude that drones with a multispectral sensor can produce useful 'snapshot' prediction maps for a range of water quality parameters, such as chlorophyll, bluegreen algae and dissolved oxygen. However, a single model was insufficient to reproduce the temporal variation of water parameters in dynamic estuarine systems. [ABSTRACT FROM AUTHOR]

Succession occurs when river biota recovers from the loss of biomass and diversity caused by flood disturbance, and has rarely been examined in the tropical savannah biome. Hypotheses are tested which address the environmental context and recovery of riffle macroinvertebrates in an Australian perennial, tropical savannah river, located in a catchment with low anthropogenic impact. Recovery occurred over a 32‐week dry‐season period of gradually declining discharge with near‐stable water quality, after a 23‐week wet‐season flood‐disturbance period, which was typical of the river's flow regime. Prolonged, benign environmental conditions during recovery facilitated the accrual of macroalgae. Macroinvertebrate abundance, mediated by macroalgal biomass, and diversity increased at a logarithmic, asymptotic rate over the recovery period. Macroinvertebrate assemblages and functional feeding groups (FFGs) tended to become more similar between consecutive sample dates as recovery progressed, though with variable abundances of core taxa (Orthocladiinae, Hydropsychidae, Orthotrichia, Chironominae and Pyralidae) and prominence of Hydroptila late in the recovery period. Filterer abundances fluctuated most, whilst the relative abundance of herbivorous shredders and predators generally increased. The return of macroinvertebrate abundance and diversity to its pre‐disturbance state is attributed to the similar pre‐ and post‐disturbance environmental conditions. Recovery broadly agreed with the secondary succession paradigm for macroinvertebrates. Macroinvertebrate succession was probably driven mainly by biotic factors, after the initial colonisation period. However, this requires elucidation and expansion of the current paradigm of river benthic succession from flood disturbance to address macroinvertebrate population dynamics under benign abiotic environmental conditions. [ABSTRACT FROM AUTHOR]

This study combined a catchment model and one-dimensional lake model (GLM-AED) to simulate the response of hydrodynamics and water quality of subtropical Advancetown Lake (South-East Queensland, Australia) to future changing climates from 2040 to 2069 and 2070 to 2099 under Representative Concentration Pathway (RCP) 4.5 and 8.5 and increased water demand from a 50% increase in population over current levels. The simulation adequately reproduced water temperature (RMSE of 0.6 °C), dissolved oxygen (DO) (RMSE of 2 mg/L), and other water quality variables, such as nitrogen, phosphorus, and chlorophyll a (Chl-a). Warming temperatures dominated the change in thermal structure and hydrodynamic status of the lake under future climate change conditions. Projected changes in precipitation and hydrological response from the upstream catchment might, however, partly offset the warming temperatures under future climate change. Increased water withdrawal due to population growth, which involved water extraction from the epilimnion, showed antagonistic effects on water stability compared to those from climate change. Under a high emission scenario of RCP8.5 during the 2080s, there is an increased likelihood of winter turnover failure in Advancetown Lake. Nutrient concentrations were simulated to decrease from reduced catchment loads under future climate change conditions. However, Chl-a concentrations were simulated to increase, especially during the period after winter turnover, under these future conditions. The depth of the hypoxia front during stratification is expected to decrease and move towards the water surface, attributable to the warming water temperatures and prolonged thermal stratification, which might affect biogeochemical processes and exchange fluxes between the hypolimnion and bottom sediments. These potential changes may present challenges for water resource management under future conditions of climate change and population growth. [ABSTRACT FROM AUTHOR]

Bioavailability models, for example, multiple linear regressions (MLRs) of water quality parameters, are increasingly being used to develop bioavailability‐based water quality criteria for metals. However, models developed for the Northern Hemisphere cannot be adopted for Australia and New Zealand without first validating them against local species and local water chemistry characteristics. We investigated the applicability of zinc chronic bioavailability models to predict toxicity in a range of uncontaminated natural waters in Australia and New Zealand. Water chemistry data were compiled to guide a selection of waters with different zinc toxicity‐modifying factors. Predicted toxicities using several bioavailability models were compared with observed chronic toxicities for the green alga Raphidocelis subcapitata and the native cladocerans Ceriodaphnia cf. dubia and Daphnia thomsoni. The most sensitive species to zinc in five New Zealand freshwaters was R. subcapitata (72‐h growth rate), with toxicity ameliorated by high dissolved organic carbon (DOC) or low pH, and hardness having a minimal influence. Zinc toxicity to D. thomsoni (reproduction) was ameliorated by both high DOC and hardness in these same waters. No single trophic level–specific effect concentration, 10% (EC10) MLR was the best predictor of chronic toxicity to the cladocerans, and MLRs based on EC10 values both over‐ and under‐predicted zinc toxicity. The EC50 MLRs better predicted toxicities to both the Australian and New Zealand cladocerans to within a factor of 2 of the observed toxicities in most waters. These findings suggest that existing MLRs may be useful for normalizing local ecotoxicity data to derive water quality criteria for Australia and New Zealand. The final choice of models will depend on their predictive ability, level of protection, and ease of use. Environ Toxicol Chem 2023;42:2614–2629. © 2023 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC. [ABSTRACT FROM AUTHOR]

Reactive oxygen species (ROS) such as superoxide radicals O2−, hydroxyl radicals OH−, and hydrogen peroxide H2O2 may have detrimental effects on marine organisms, including their integuments and visual appearances. Although some studies have described the impact of ROS on marine ecosystems and species ecology, the influence on the optical response of the integuments of marine species and on their visual appearances remains unknown. In this article, we used histology and optical characterisation to show, for the first time, that skin melanophores (melanin-containing chromophores) of the coral reef fish, Stegastes apicalis, change their shapes and fluorescent proprieties upon oxidation with H2O2 radicals. Our observations also suggest that pheomelanosomes may occur in fish integuments, where, previously, it was thought that fish melanosomes only contain eumelanin. This investigation relied on light and electron microscopy and steady-state fluorimetry, as well as time-resolved streak imaging systems. We suggest that the changes in the morphological and spectral characteristics of melanophores can be used as a marker of physiological stress induced by environmental factors such as ROS. Moreover, S. apicalis may be used as a potential model for studying the interaction between the surrounding environment and natural organisms in biologically diverse ecosystems, such as the Great Barrier Reef in Australia. [ABSTRACT FROM AUTHOR]

Invasive deer have undesirable impacts on native ecosystems. Culling is commonly used to reduce those impacts, but is expensive and sometimes controversial. It is therefore important to robustly assess how culling reduces the impacts of invasive deer.We conducted a Before‐After Control‐Impact (BACI) experiment to determine how culling affects the impacts of invasive sambar deer Cervus unicolor in an endangered alpine peatland ecosystem in south‐eastern Australia. We established two blocks, each with four 4300‐ha experimental units, in which two units were randomly assigned to a treatment of deer culling and the other two were non‐treatment areas. Sambar deer relative abundance (faecal pellet count) and three impacts (ground degradation, pugging intensity and water turbidity) in three peatland features (peatlands, natural pools and sambar deer wallows) were surveyed before and after culling was implemented. We used four metrics to quantify the culling intensity in each treatment unit: treatment versus non‐treatment, number of deer culled on each unit, deer culled within a 500‐m buffer of impact monitoring sites and local probability of use by the cullers (1‐ha grid). The effects of culling on deer abundance and impacts were estimated using Bayesian generalised linear mixed models.Our analysis revealed that the effect of culling differed between the two experimental blocks. In one block, culling reduced deer abundance and three impacts. In the other block, culling did not reduce deer abundance but reduced three impacts and increased two impacts. The effects of culling were generally stronger when culling was estimated using finer‐scale (500‐m) than coarser‐scale (experimental unit) culling metrics.Synthesis and applications. Our study provides experimental evidence that culling invasive sambar deer reduces some of their undesirable impacts on endangered peatlands. That not all impacts were reduced by culling suggests that some effects of invasive species are slow to recover or require higher culling intensities to be reversed. [ABSTRACT FROM AUTHOR]

The effective management of surface water bodies, such as rivers, lakes, and reservoirs, necessitates a comprehensive understanding of water quality status. Altered precipitation patterns due to climate change may significantly affect the water quality and influence treatment procedures. This study aims to identify the most suitable water quality prediction models for the assessment of the water quality status for three water supply reservoirs in Toowoomba, Australia. It employed four machine learning and two deep learning models for determining the Water Quality Index (WQI) based on five parameters sensitive to rainfall impact. Temporal WQI variations over a period of 22 years (2000–2022) are scrutinised across 4 seasons and 12 months. Through regression analysis, both machine learning and deep learning models anticipate WQI gauged by seven accuracy metrics. Notably, XGBoost and GRU yielded exceptional outcomes, showcasing an R2 value of 0.99. Conversely, Bidirectional LSTM (BiLSTM) demonstrated moderate accuracy with results hovering at 88% to 90% for water quality prediction across all reservoirs. The Coefficient of Efficiency (CE) and Willmott Index (d) showed that the models capture patterns well, while MAE, MAPE and RMSE provided good performance metrics for the RFR, XGBoost and GRU models. These models have provided valuable knowledge that can be utilised to assess the adverse consequences of extreme climate events such as shifts in rainfall patterns. These insights can be used to improve strategies for managing water bodies more effectively. [ABSTRACT FROM AUTHOR]

During the twentieth century, inadequate management of mine waste at the Mount Lyell Copper Mine affected the ecology of the Queen–King Rivers and Macquarie Harbour, western Tasmania, Australia. Over the past two decades, the water quality of the river system has been measured semi-annually to investigate the long-term hydrochemical and environmental impacts caused by these historical mine practices and the waste associated with the Mount Lyell mine to the Queen–King Rivers. At sample sites below the confluence of Haulage Creek, the water pH was below pH 3.5, remaining below pH 5 across all sites to Macquarie Harbour. Local baseline rivers ranged from pH 4.0 to 8.4. Elemental concentrations of dissolved metals in water samples downstream of Haulage Creek were above the Australian and New Zealand Environment and Conservation Council (ANZECC) water quality guidelines. Copper, Fe, and Zn were not attenuated along the length of the river, with concentrations remaining elevated to the King River Delta. Mineralogical analyses demonstrated secondary minerals in sediments at Haulage Creek and pyrite concentrated at the King River Delta. Static tests on mining-affected sediments indicated risk of AMD and metal(loid) leaching in the river system. Since 2016, after flooding of the Prince Lyell mine, dissolved metal levels in the Queen–King Rivers have decreased; however, concentrations remain above guidelines. Almost three decades after legacy mine waste disposal ended, it still poses a long-term risk to the downstream environment, implying that without effective management of these historical mine wastes, the Queen–King Rivers will continue to be severely impacted. [ABSTRACT FROM AUTHOR]

Headwater streams are critical to the integrity of the stream network, yet they are being rapidly degraded, channelized, or lost through land-cover and land-use change, particularly in urbanizing areas. We refined the definition of a headwater stream, reviewed the headwater stream ecosystem literature using examples from southeastern Australia and globally, and identified 4 critical knowledge gaps that are hampering the management of these unique systems: 1) inadequate high-resolution mapping and, thus, low-accuracy estimates of headwater stream locations and extents within catchments; 2) insufficient characterization of headwater stream typologies across varying geological, topographical, climatic, and anthropogenic conditions; 3) incomplete quantification of headwater stream structure, function, and ecosystem services across varying scales; and 4) limited understanding of the effects of urbanization on headwater streams against a backdrop of climate change. We propose a series of research questions to address these gaps and, finally, hypothesize and discuss the most effective ways to protect headwater streams in urbanizing environments given our current state of understanding. Of particular importance are the need to 1) shift perceptions of these systems as dry, insignificant depressions in the landscape; 2) manage both the headwater stream catchment and the channel; and 3) prioritize protection of the natural flow regime. [ABSTRACT FROM AUTHOR]

Climate and anthropogenic change, particularly agricultural runoff, increase blue-green algae/cyanobacteria blooms. This article researches cyanobacteria alert-level identification, management, and risk communication in Lake Hume, Australia. Two methods, document and content analysis, evidence contamination events and risk communication, reflect water governance and data management limitations. Results found that Lake Hume had amber or red alerts for only one week, December 2021–December 2022. This failed to prevent government tourism promotion of recreational usage, contravening water authority red alert advice. Lake-use restrictions lacked compliance enforcement. Events during amber alerts lacked risk communication to vulnerable populations (children). Lake Hume's governance by the Murray–Darling Basin Authority restricted risk communication to one authority that reproduced generic advice in minimal outlets/time points. Geophysical signage failed to address diversity needs (language, literacy, age, and disabilities). No risk communication was found for residents with diseases exacerbated by aerosolization. Despite WHO promoting cyanotoxin investigation, Australian research is absent in international literature. Further, Lake Hume cyanobacteria produce potentially carcinogenic microcystein. This coexists with census data revealing cancer rates higher than the national average in a waterside town. The results demonstrate the need to incorporate robust public health risk assessments, communication, and management into water management and advocate international legislation changes based on evidence-based research to reduce blooms and prevent agricultural runoff. [ABSTRACT FROM AUTHOR]

Citizen science is increasingly recognised as an important, indeed necessary, contribution to environmental research and policy, as well as for fostering stronger relationships between scientists and the broader community. Well-established citizen science projects offer valuable insights by virtue of the long-term contribution of volunteers to sustained research and monitoring activities. Here we draw on two of Australia's longest running citizen science projects, Waterwatch and the Australian Shorebird Monitoring Program (formerly Shorebirds 2020), to argue that such projects reflect successful citizen science in terms of their program persistence, reputation and impact. This success has been enabled by (1) developing a clear vision; (2) effective knowledge management; (3) relationship building; (4) meaningful volunteer engagement; and (5) a capacity to adapt to change. We recommend that new and emerging projects embed these principles in their program development, particularly those aiming to generate longitudinal datasets while building motivated, informed and connected communities. Long-term citizen science programs offer important insights for new and emerging projects by virtue of their persistence, reputation and impact. Developing a clear vision, effective knowledge management, relationship building, meaningful volunteer engagement, and adapting to change will help programs measure environmental change while building motivated, informed and connected communities. [ABSTRACT FROM AUTHOR]

It has been widely assumed that after prolonged droughts, catchment runoff recovers to pre‐drought levels. This assumption has recently been evaluated and challenged using empirical observations. However, water quality response and recovery, or otherwise, during and after prolonged droughts remains an open question. Answering this question potentially identifies any changes in catchment hydrological processes and water balance (e.g., the proportion of groundwater contribution to streamflow), thus informing the mechanisms for runoff non‐recovery after prolonged drought. Water quality responses to drought can also inform any long‐term water quality changes beyond what is observable from trend analyses. Here stream salt load changes were investigated using hidden Markov models (HMMs), where monthly rainfall was included as a predictor of stream salt loads. Monthly riverine salt fluxes at eight sites in Victoria (Australia) were examined before, during and after a prolonged drought in South‐East Australia—the Millennium Drought. Two‐state models, where salt loads varied between 'normal' and 'low' states, were found to better predict in‐stream salt loads compared to single‐state models. The results showed that catchments shifted to a low salt load state generally after the catchment changed to a low runoff state. As groundwater is understood to be the major source of salts in these catchments, this suggests that reductions in groundwater flow into rivers occur as a result of the shift to a lower runoff state. Understanding how readily water quality in catchments shift to different states during and after prolonged droughts enables appropriate catchment management based on our understanding of changes to catchment hydrology. [ABSTRACT FROM AUTHOR]

Using a three-infrastructures (grey, soft, and green) framework, we examined key risks to water availability and quality in the Murray-Darling Basin, Australia. These risks include increased irrigation efficiency, without a quantitative knowledge of the impact on water flow pathways, particularly return flows, growth in farm dams and floodplain harvesting, and unsustainable management of salinity. Critical to mitigating these risks are the metering, monitoring, and auditing of water flows, effective linkages between evidence and analysis, and accountability of decision-makers operating in the public interest. We contend that these approaches need to be supported by innovative risk assessments, which are fit-for-purpose under the MDB Plan, wherein the 'who, what, when and where' are assessed in relation to cumulative, systemic, and cascading risks from human actions. [ABSTRACT FROM AUTHOR]

In Australia's Murray – Darling Basin (MDB), the law explicitly requires strategies for managing risks to water quality and quantity. In this paper, we analyse water governance in the Basin, identifying inadequate governance standards and practices. Current arrangements in the MDB demonstrate deficiencies and vulnerabilities that limit capabilities for dealing with known or emerging risks and erode the legitimacy of governing institutions. Our analysis of the problems and opportunities for reform is informed by the OECD's principles of good water governance and the legal concept of the rule of law. We conclude that ignoring opportunities to adopt better-practice water governance is a severe risk to the MDB's shared waters. To overcome reactionary crisis-reaction reform, we propose reforms that empower critical evaluations of governance structures, rules, practices and participation. Therefore, proposed reforms of policy, institutions and legislation do not simply attempt one-off changes to enhance transparency and accountability but instead seek to enshrine processes of continuous, ongoing improvements to water governance. [ABSTRACT FROM AUTHOR]