Environmental Watering Research Articles

Extensive Tracking of Nomadic Waterbird Movements Reveals an Inland Flyway.

Waterbirds are highly mobile and have the ability to respond to environmental conditions opportunistically at multiple scales. Mobility is particularly crucial for aggregate-nesting species dependent on breeding habitat in arid and semi-arid wetlands, which can be ephemeral and unpredictable. We aimed to address knowledge gaps about movement routes for aggregate-nesting nomadic waterbird species by tracking them in numbers sufficient to make robust assessment of their movement patterns. We hypothesised that analysis of long-distance movements would identify common routes with consistent environmental features that would be useful as context for conservation management. We used GPS satellite telemetry to track the movements of 73 straw-necked ibis (Threskiornis spinicollis) and 42 royal spoonbills (Platalea regia) over 7 years (2016-2023). We used these data to identify long-distance movements and to demarcate and characterise movement routes. We identified common routes used by both species, including a 'flyway' over 2000 km long, spanning Australia's Murray-Darling Basin from the south-west to the north-east. This flyway connects important breeding sites and is characterised by flat, open/unforested areas with low elevations of < 350 m and mid to high rainfall. The flyway corresponds to an area west of Australia's Great Dividing Range, which appears to act as a low-permeability barrier to the movement of both species. Identification of an inland flyway for waterbirds in Australia provides important context for multi-jurisdictional cooperation and strategic management. Where resources are limited, water and wetland management efforts (e.g., environmental watering) should be preferentially located within this route. Similarly, targeting threat mitigation within common movement routes may have disproportionate importance for long-term population viability. Given the widespread distribution of similar species globally, there are likely to be other flyways worthy of scientific and conservation management attention that could be identified using our approach.

Smart Poultry Farm Automation

Our case-study paper entitled "Smart Poultry Farm Automation" aims to enhance the efficiency and productivity of poultry farming through the application of advanced automation technologies. Poultry farming plays a crucial role in meeting the growing global demand for poultry products. However, traditional farming methods often face challenges related to labor intensity, resource management, and monitoring. This project proposes the design and implementation of a comprehensive automation system for poultry farms. The system will integrate sensors, actuators, and IoT (Internet of Things) technologies to automate various tasks such as environmental control, feeding, watering, and health monitoring of poultry. Real-time data collection and analysis will enable farmers to optimize farm conditions, improve bird health, and minimize resource wastage. Key components of the proposed system include environmental sensors for monitoring temperature, humidity, and ventilation; automated feeders and waterers controlled by IoT devices; and health monitoring systems utilizing image processing or sensor data for early disease detection. The system will be designed to provide farmers with remote access and control through a user-friendly interface, allowing them to monitor farm operations and receive alerts or notifications. The expected outcomes of this project include increased productivity, reduced operational costs, improved animal welfare, and better decision-making for farmers. By leveraging automation and IoT technologies, the proposed system will contribute to the modernization and sustainability of poultry farming practices

Зоотехния лабораторных песчанок

For the maintenance of laboratory gerbils, which are a valuable test system in preclinical studies, it is necessary to pay attention to such zootechnical parameters as the conditions of their placement, taking into account the parameters of the microclimate, feeding rations appropriate to their needs, as well as options for providing environmental enrichment. An important process in the maintenance of this type of animal is the selection and provision of a suitable enrichment environment in order to reduce their stress and anxiety levels. In order to maintain the number of available gerbils or increase it, it is necessary to take into account their reproductive indicators, as well as species characteristics when composing parental pairs. To carry out a traditional analysis of the scientific literature on the zootechny of laboratory gerbils. The search for publications was performed in the PubMed and Google Scholar databases. The review included searchable publications as of September 11, 2023. In this review, the main aspects of keeping gerbils were identified, namely: optimal floor area, frequency of cell replacement, as well as features of proper animal capture, optimal microclimate conditions (permissible temperature, humidity, ventilation and lighting conditions), types of environmental enrichment, feeding and watering of animals depending on their age and physiological conditions, as well as reproductive indicators of gerbils, including features of the selection of parental pairs. When analyzing the literature data, the main recommendations on the maintenance of gerbils were collected, taking into account all zootechnical needs for their placement and reproduction.

Stochastic metapopulation dynamics of a threatened amphibian to improve water delivery

AbstractWater extraction and climate change are altering the availability of surface water globally, thereby contributing to amphibian population declines. The managed delivery of water to benefit environmental values (environmental watering) is a promising conservation technique that can support amphibian recruitment and maintain viable populations. Environmental water can be delivered in various spatial patterns and with different frequencies, but comparing the effectiveness of competing strategies is complicated by variable and interactive environmental processes. We built a spatially explicit, stochastic, hydroecological metapopulation model to compare the effects of five environmental‐watering scenarios on the probability of persistence of threatened southern bell frogs (Litoria raniformis) in a major river reach in southern Australia. We compared a no‐intervention control to two managed watering frequencies (moderate and frequent) delivered in two spatial designs (managed wetlands grouped or spread across the reach). More frequent water provision to intervention sites improved the reach‐wide (metapopulation) probability of persistence, and spreading intervention sites across the reach improved persistence more than grouping intervention sites together. When re‐examined under severe drought conditions, L. raniformis had a 0.04 probability of persistence without intervention, which improved to 0.56 with high watering frequency. Model‐guided environmental water provision can improve reach‐wide persistence of amphibian metapopulations by guiding spatial and temporal delivery patterns to reduce the risk of extinction.

Browsing impacts on seedling survival of Black Box (Eucalyptus largiflorens)

SummaryBlack Box (Eucalyptus largiflorens F. Muell) is a dominant floodplain tree across the Murray‐Darling Basin. At Hattah‐Kulkyne National Park (northwest Victoria), historical changes in the hydrological regime and land use have degraded Black Box populations, with the majority of trees in poor health and with limited recruitment. To mitigate this threat, environmental watering has been implemented to improve condition, but successful regeneration has been limited. A 17‐month trial (April 2021 to September 2022) was undertaken to evaluate the effectiveness of different management techniques in promoting Black Box regeneration (natural regeneration, seed‐scattering, tube stock and browsing control: guarded and unguarded tube stock). At the end of the trial, only four of the initial 63 seedlings remained alive (two guarded tube stock and two natural regeneration). Most seedling death was attributed to browsing (likely kangaroos), which was evident in the first three months, with unguarded plants heavily impacted. No germinants were recorded in the seed—scattering plots. Our findings of high browsing impacts on Black Box seedling survival, corroborates existing data on browsers (abundance levels and management thresholds) and emphasises the importance of incorporating herbivore browsing management in floodplain vegetation management strategies that aim to promote regeneration within Hattah‐Kulkyne National Park.

Evaluating and optimising performance of multi-species call recognisers for ecoacoustic restoration monitoring.

Monitoring the effect of ecosystem restoration can be difficult and time-consuming. Autonomous sensors, such as acoustic recorders, can aid monitoring across long time scales. This project successfully developed, tested and implemented call recognisers for eight species of frog in the Murray-Darling Basin. Recognisers for all but one species performed well and substantially better than many species recognisers reported in the literature. We achieved this through a comprehensive development phase, which carefully considered and refined the representativeness of training data, as well as the construction (amplitude cut-off) and the similarity thresholds (score cut-offs) of each call template used. Recogniser performance was high for almost all species examined. Recognisers for Crinia signifera, Limnodynastes fletcherii, Limnodynastes dumerilii, Litoria peronii and Crinia parinsignifera all performed well, with most templates having receiver operating characteristics values (the proportion of true positive and true negatives) over 0.7, and some much higher. Recognisers for L. peronii, L. fletcherii and L. dumerilii performed particularly well in the training data set, which allowed for responses to environmental watering events, a restoration activity, to be clearly observed. While slightly more involved than building recognisers using commercial packages, the workflows ensure that a high-quality recogniser can be built and the performance fine-tuned using multiple parameters. Using the same framework, recognisers can be improved on in future iterations. We believe that multi-species recognisers are a highly effective and precise way to detect the effects of ecosystem restoration.

The Dammed and the Saved: a Conservation Triage Framework for Wetlands under Climate Change in the Murray–Darling Basin, Australia

As the impacts of climate change and water demands from irrigation continue to increase in the Murray–Darling Basin, water for the environment is becoming more scarce and the ecological conditions of many wetlands is poor. With water scarcity, conservation triage is becoming an increasingly relevant management option for environmental watering of wetlands. However, triage is controversial; being considered contrary to current conservation objectives and practices. We assessed environmental watering at two Ramsar wetlands, Macquarie Marshes and Gunbower Forest, based on international environmental treaty obligations and domestic policy settings, changes to flow regimes, wetland condition and current management. Triage decision making was found to be in tacit use at Macquarie Marshes, based on ‘rules of thumb’ and experiential ecohydrological knowledge, whereas formal environmental watering planning formed the basis for triage decision making at Gunbower Forest. We developed a framework for conservation triage of wetlands in the Murray–Darling Basin to stimulate change in the decision context for wetland conservation and adaptation under climate change. Conservation triage entails reframing of relationships between people and nature and values, rules and knowledge used by stakeholders. Because water is the medium by which wetland conservation outcomes eventuate, trade-offs between competing water uses can be realised with the triage framework.

The Role of Environmental Water and Reedbed Condition on the Response of Phragmites australis Reedbeds to Flooding

Globally, wetlands have experienced significant declines in area and condition. Reedbeds are a key attribute of many wetlands and are typically composed of Phragmites australis (common reed), a globally distributed emergent aquatic perennial grass. Environmental water is increasingly used to support functioning river and floodplain ecosystems, including reedbeds, where maintaining wetland vegetation condition is a common objective. Drone-based remote sensing allows for the consistent collection of high-quality data in locations such as wetlands where access is limited. We used unoccupied aerial vehicles (UAVs) and convolutional neural networks (CNNs) to estimate the cover of Phragmites australis and examine the role of reedbed condition and prior environmental watering in the response of reedbeds to flooding. Data were collected from a large inland reedbed in semi-arid western New South Wales, Australia between October 2019 and March 2021 using UAVs and processed using CNNs. Prior to the flood event, sites that had received environmental water had a significantly greater cover of Phragmites australis. The sites that were not managed with environmental water had very low cover (&lt;1%) of reeds prior to the flood event and transitioned from a Critical condition to a Poor or Medium condition following flooding. Using UAVs and CNNs we demonstrated the role environmental water plays in filling the gaps between large flood events and maintaining the condition and resilience of reedbeds.

Environmental Flows to Estuaries and Coastal Lagoons Shape the Salinity Gradient and Generate Suitable Fish Habitat: Predictions From the Coorong, Australia

Freshwater flows to estuaries shape habitat, transport nutrients to drive productivity, and generate a salinity gradient that impacts water quality and provides spawning cues for fish. The aim of this study was to quantify how environmental flows improved outcomes for a coastal lagoon system (the Coorong, South Australia), considering the export, and prevention of ingress, of salt from the system, and the increased available habitat for key fish biota. A hydrodynamic model was used to simulate salinity and water temperature, and to determine the salt exchange between the Coorong and ocean for the observed conditions with environmental water release included. Scenario simulations showed that maintaining river flow is shown to arrest salt intrusion from the ocean into the Coorong. Without environmental water, the net import of salt into the Coorong would have been considerably greater, ranging between 1.86 million tonnes in 2018–19 to approximately 2.33 million tonnes in 2019–20. The fresher conditions created by environmental water provision supported a considerable expansion of suitable fish habitat area, derived from a simple habitat index based on salinity and water temperature. Without environmental water the habitat suitable for mulloway would have contracted by 38% over the 3 year investigation period. A similar trend is evident for black bream, Tamar goby, greenback flounder, yelloweye mullet, congolli and smallmouth hardyhead. The results highlighted the importance of cumulative benefits from delivering environmental water over multiple years, with different results obtained if the environmental water provided regularly or just focused over a single year. The approach used in this work to relate hydrological changes from water management to indicators of habitat suitability through changes to physical attributes provides information to inform the evaluation of environmental watering, as well as a tool to support future decision making to maximise the benefits from this precious resource.

Effects of inundation on water quality and invertebrates in semi-arid floodplain wetlands

Floodplain wetlands play a significant role in the storage of sediment and water and support high levels of nutrient cycling that is driven by intermittent inundation. In regulated rivers, there is often a reduction in the frequency and duration of inundation and managed floodplain inundation is used as a tool to help restore wetlands. It is important to quantify the outcomes of re-introducing water to floodplain wetland systems. We examined the effects of environmental floodplain watering on water quality and three groups of invertebrates, including benthic and pelagic microinvertebrates and macroinvertebrates, in two wetlands systems on the Gwydir River system in the north of the Murray-Darling Basin. We hypothesised that a wetland inundated for longer periods of time would have altered water quality and support a greater richness and abundance of invertebrates, thus altering their assemblage structures. Water quality and the assemblage structure of all three invertebrate groups in the wetlands was significantly influenced by the time since connection (TSC) to their rivers and therefore the length of inundation. However, the response of water quality and the microinvertebrate assemblages to TSC differed between the two wetlands. Water quality was affected by an increase in six variables, including the nutrient TN and a decrease in the nutrient SRP. Microinvertebrate abundance was positively associated with TSC, but the abundance of macroinvertebrates was not. The relationships demonstrated between TSC and invertebrates indicate that the duration of inundation is important in maintaining the ecology and food webs in these and other semi-arid floodplain wetlands.

Rethinking Condition: Measuring and Evaluating Wetland Vegetation Responses to Water Management

Environmental water management is increasingly used to restore riverine, wetland and floodplain ecosystems and requires an understanding of what the flow regime or restoration objectives are, why these objectives are being targeted and how outcomes will be evaluated. This perspective paper focuses on non-woody vegetation, an important component of river-floodplain ecosystems and a targeted outcome for many environmental flow management programs, such as the Basin wide environmental watering strategy for the Murray-Darling Basin in Australia. Effective management of non-woody vegetation using environmental water requires identifying a suite of measurable condition outcomes (the “what”), understanding how these relate to broader functions and values (the “why”) and developing clear cause-and-effect relationships between management and outcomes (the “how”). A critical component of this process is to characterise what constitutes management success, which requires reimagining current definitions of condition to better incorporate dynamic functions and diverse values. We identify the need to characterise condition in a structured framework using both ecological data and societal values. This approach will not only help inform the development of benchmarks, watering objectives and monitoring metrics, but will also facilitate engagement by a broader spectrum of the community with the management and outcomes of environmental watering.

Watering of wetlands on Indigenous Country in the Murray–Darling Basin, Australia

Context Water managers in the Murray–Darling Basin increasingly recognise the cultural and environmental benefits generated by Indigenous co-management of environmental water. However, traditional knowledge and values are subsidiary to western technical and scientific perceptions when prioritising environmental water use. Aims and methods We mapped the locations and volumes of Commonwealth Environmental Water Office environmental watering events onto the wetlands within the land area represented by different state-determined Indigenous organisations and discuss how this relates to the varied nature and extent of Indigenous engagement in environmental watering decisions. Key results Between 2014–15 and 2018–19, one organisation had nearly 13% of the area of wetlands watered, but the average was less than 3%. In all, 18 of the 26 organisations received no environmental water. Conclusions The distribution of environmental flows does not meet the cultural needs of Indigenous nations due to physical restrictions and policy limitations. Yet, there are clear environmental and cultural co-benefits where Indigenous peoples have developed partnerships with environmental water managers. Developing stronger partnerships and increasing Indigenous water entitlements from the current 0.17% of issued entitlements would maximise these benefits in catchments where environmental water is prioritised. Implications The reviews of the Water Act and the Basin Plan scheduled for 2024–26 present opportunities to implement reforms.

Seedling root growth experiments for two Australian dryland riparian eucalypts provide new insights for environmental watering

AbstractIn dryland environments where rivers have been modified by water resource developments, the use of environmental water provides a management tool to restore or maintain riparian vegetation conditions. Relevant management actions include watering to promote the recruitment of highly valued woody species. However, for many riparian trees, little is known about the watering regimes needed to achieve successful recruitment. We conducted a glasshouse experiment to investigate the early growth of 5‐week old seedlings of two Australian dryland riparian tree species, coolibah (Eucalyptus coolabah) and river red gum (Eucalyptus camaldulensis), in floodplain soil cores to provide insights into their requirements for successful establishment in dryland habitats. Both species exhibited similar growth patterns for their above‐ground components. E. coolabah root penetration through soil cores was consistent over the 12‐week experiment. In contrast, E. camaldulensis root penetration appeared to be considerably slower during the first 6 weeks, but then became more rapid over the following 6 weeks, with similar rooting depths after 12 weeks observed to those of E. coolabah. These findings suggest that coolibah seedlings are more likely to establish under rapidly drying conditions than river red gum seedlings. Such differences in early growth for these iconic species should be considered when determining the provision of environmental water for their management.

Determining water requirements for Black Box (Eucalyptus largiflorens) floodplain woodlands of high conservation value using drip‐irrigation

AbstractBlack Box (Eucalyptus largiflorens F. Muell.), is a keystone tree species of lowland semi‐arid floodplain ecosystems in south‐eastern Australia. E. largiflorens woodlands are of high conservation value and threatened by climate change‐induced drought and irrigation water diversions due to their location on upper floodplain areas where flood frequency has declined. Water requirements of E. largiflorens have not been well quantified using empirical data. Accordingly, knowledge gaps exist in relation to volumes of environmental water required to maintain and improve ecological condition for disconnected floodplain woodlands. To further assist conservation and water resource management, we tested the use of drip irrigation to provide a variety of water regimes to experimental plots in order to monitor tree responses. Water was provided via irrigation delivery across four regimes representing known volumes of water, referred to as an environmental water provision, applied over a 22‐week period for two Austral summers. Benefits to trees were identified by measuring transpiration and plant water status using sap flow sensors and a Scholander pressure chamber, respectively. Results indicate that volumes of 0.3, 0.4, 0.7 and 0.8 ML increased transpiration and improved plant water status in comparison to a control, with delivery recommended to commence early autumn. Greater volumes (1.4 ML), substantially increased transpiration and improved water status, especially when delivered at a rate of ~25 mm week−1 compared to a monthly 'burst' which broadly represented natural, sporadic summer rainfall in the region. For an environmental watering provision of 25 mm week−1, ~178 ha of E. largiflorens woodland can be watered with a 1 GL environmental water allocation. The study methods presented are relevant worldwide and our results further the collective understanding of the benefits environmental water provides to E. largiflorens.

A multiple‐lines‐of‐evidence approach for prioritising environmental watering of wetland and floodplain trees

AbstractLong‐lived vegetation is a key attribute of lowland river floodplains; yet dieback is increasingly being reported globally, with prior studies identifying salinity, drought and altered flow regimes as key stressors. In the Murray–Darling Basin (Australia), many floodplain/wetland areas have management strategies that aim to maintain the condition of floodplain tree communities. Environmental water delivery is a key tool used to achieve such outcomes. Currently, one of the primary tools for determining the need for environmental water delivery is a qualitative visual assessment of tree crown condition. To advance to more quantitative assessment and understanding of tree condition, we present a suite of techniques ranging from low‐cost, rapid visual assessment of tree crown condition to laboratory analysis of components of soil condition and in situ measurement of tree physiology. The aim is to address a number of key knowledge gaps on how to use the linkages between soil water availability ↔ tree physiology ↔ tree visual condition to quantitatively inform environmental water delivery decisions to meet management objectives. We have developed a multiple‐lines‐of‐evidence management assessment framework that presents a pathway to enable managers to improve prioritisation management actions. Furthermore, increased confidence in predicted outcomes should assist water holders and floodplain managers to optimise timing and maximise the benefits of environmental watering. Application of outcomes of this research will increase the efficiency of environmental water use.

Flow to nowhere: the disconnect between environmental watering and the conservation of threatened species in the Murray–Darling Basin, Australia

The Murray–Darling Basin Plan was established with the objective of restoring water from irrigation to the environment, thereby conserving wetlands and biodiversity. We examined whether the Plan is achieving this objective by assessing whether environmental watering has helped conserve threatened flow-dependent fauna. Two frog species, two waterbirds and four fishes, were assessed for their conservation status in relation to (1) whether they were targeted in environmental watering plans, (2) whether population monitoring had occurred and (3) evidence of population recovery. We determined indicators of abundance and occurrence of species between 2012–13 and 2018–19 and found widespread inconsistencies in the targeting of environmental watering for these species, including their being overlooked in watering plans and actions in several catchments. Environmental watering had some positive outcomes for some threatened species in some locations on some occasions, but benefits, and their monitoring and reporting, are patchy and inconsistent. Monitoring of temporal trends in distribution, occurrence and abundance of species is inadequate to evaluate success. If the Plan is to achieve its objective and uphold Australia’s international environmental treaty obligations, more needs to be done to target and deliver environmental water for threatened species and improve the monitoring and reporting of outcomes.

Lacking character? A policy analysis of environmental watering of Ramsar wetlands in the Murray–Darling Basin, Australia

Freshwater ecosystems are among the most vulnerable and endangered in the world, facing continued uncertainty under climate change, development of water resources and land use change. The Ramsar Convention on Wetlands (1971) is one of the longest-standing international agreements on biodiversity conservation. Its central objective is the maintenance of the ecological character of Wetlands of International Importance and the wise use of all wetlands. Here, we examine how the maintenance of ecological character has been addressed in Australia as part of the Murray–Darling Basin Plan, one of the most ambitious water reform programs to be undertaken globally and intended to restore water from irrigated agriculture to the environment. We analyse policy and planning documents from Commonwealth and state jurisdictions on the management of environmental water. Despite stated objectives to conserve Ramsar wetlands in the Basin Plan, we found a pattern of complex and convoluted arrangements for delivering environmental water to Ramsar wetlands and a lack of transparency and accountability about how Ramsar obligations are considered within each jurisdiction. We conclude that consideration of the ecological character of Ramsar wetlands has been marginalised by governments when managing environmental water, despite the statutory requirements to maintain these wetlands.

A trickle, not a flood: environmental watering in the Murray–Darling Basin, Australia

Environmental flows are an integral component for the conservation and management of rivers, flood plains and other wetlands in the Murray–Darling Basin. Under the Basin Plan, environmental water is managed by the Commonwealth Environmental Water Office (CEWO) and the states. We assessed CEWO environmental flows (2014–15 to 2018–19), compared our findings with expected outcomes for vegetation in the Basin-wide Environmental Watering Strategy (EWS) and interviewed water managers about the efficacy of environmental watering. Some 21% of CEWO water was delivered as flood events, to 9 of 19 river valleys, inundating 7% of wetland area in those valleys annually and 0.8% of major Basin wetlands. A consistent pattern was the watering of many small wetlands on the South Australian Murray with small volumes (median area 43ha, volume 125ML). Just 12% of the area of river red gum subject to EWS expected outcomes was flooded, and half these events were likely suboptimal to achieve ecological benefits. Wetlands have not received the water they need and vegetation outcomes cannot be met by completion of the Plan in 2024. Rules that constrain flooding of private land must be relaxed if the Plan is to achieve its statutory requirement of wetland conservation.

A standardised approach to calculating floodplain tree condition to support environmental watering decisions

Ground-based visual assessment of crown condition is a cornerstone of tree condition assessment globally, and numerous condition assessment approaches have evolved to address the needs and perspectives of different users. In Australia’s iconic Murray–Darling Basin (MDB), stands of floodplain eucalypts are increasingly vulnerable to a range of interacting stressors related to climate change and over-extraction of water for consumptive and agricultural use. A standardised approach developed in 2008 for assessing floodplain trees within the MDB provides extensive guidance to ensure field data is collected consistently. However, there is minimal instruction on how to interpret data, and consequently a range of evaluation approaches have evolved. The lack of a standardised reporting framework generated by these different approaches makes it difficult for floodplain managers and environmental water holders to make repeatable, robust decisions for prioritising water allocations across competing locations. To provide improved lines of evidence to support decision making, this paper describes a ‘best-practise’ approach to calculating a tree condition score from field data. Within, we document existing approaches in the southern Murray–Darling Basin, and recommend a method that meets the needs of floodplain managers as a pragmatic reporting, communication and decision support tool that does not require statistical analysis. Case studies and a revised conceptual model of tree decline and recovery are provided to demonstrate the validity of the recommended approach.

Investigating the impact of artificial environmental watering on a semi‐arid, highly saline floodplain using electromagnetics and surface nuclear magnetic resonance

Investigating the impact of artificial environmental watering on a semi‐arid, highly saline floodplain using electromagnetics and surface nuclear magnetic resonance