A5034766783- Fish Ecology and Management Studies
- Water Quality and Pollution Assessment
- Freshwater macroinvertebrate diversity and ecology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Hydrology and Sediment Transport Processes
- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Soil erosion and sediment transport
- Nietzsche, Schopenhauer, and Hegel
- Fish Biology and Ecology Studies
- Fecal contamination and water quality
- Coastal and Marine Management
- Diatoms and Algae Research
- Marine and coastal ecosystems
- Environmental Science and Water Management
- Aquatic Ecosystems and Biodiversity
- Fire effects on ecosystems
- Marine and fisheries research
- Marine Biology and Ecology Research
- Pharmacology and Obesity Treatment
- Water Treatment and Disinfection
- Chronic Kidney Disease and Diabetes
- Microbial Community Ecology and Physiology
- Salmonella and Campylobacter epidemiology
Charles Darwin University
2010-2024
Sainsbury Wellcome Centre
2024
Department of Environment, Parks and Water Security
2024
Ambulance Service of New South Wales
2024
Sainsbury Laboratory
2024
Government of the Northern Territory
1996-2021
University of Exeter
2016-2020
NSW Department of Planning and Environment
2005
Plan International
2004
1. Northern Australia is characterised by a tropical wet–dry climate that regulates the distinctive character of river flow regimes across region. There marked hydrological seasonality, with most occurring over only few months year during wet season. Flow also high variability between years, and in degree cessation, or intermittency, dry 2. At present, relatively low human population density demand for water region means rivers have largely unmodified regimes. These therefore provide good...
Abstract The modification of river flow regimes poses a significant threat to the world’s freshwater ecosystems. Northern Australia’s resources, particularly dry season flows, are being increasingly modified support human development, potentially threatening aquatic ecosystems and biodiversity, including fish. More information is urgently needed on ecology fishes in this region, their habitat requirements, water policy management ensure future sustainable development. This study used...
Balancing the freshwater needs of humans and ecosystems is a fundamental challenge for management rivers worldwide. River regulation water extraction can affect all components natural flow regime, yet few studies have investigated effects on low-flow end hydrograph. Low-flow periods are hydrologically distinctive ecologically important, varying in nature among climatic zones. Tropical savannah characterized by highly seasonal predictable regimes, but with high interannual variation...
The hierarchy of factors that control the growth and biomass Spirogyra sp. was examined for an 18-km reach Daly River in wet/dry tropics northern Australia. On annual temporal scale, hydrological disturbances Spirogyra. Over wet season (typically December–April), frequent runoff events prevent colonisation River. This is followed, however, by a lengthy period May–November) without river velocities favour benthic algal growth. In 2001, became visible mid-May, then grew to maximum early August...
In this paper, the dynamics of primary production in Daly River tropical Australia are investigated. We used diurnal-curve method for both oxygen and pH to calculate photosynthesis respiration rates as indicators whole-river productivity. The has maximum discharges during summer, monsoonal season. Flow dry season is maintained by groundwater discharge via springs. study investigated how evolve period low flow river (April–November). relationship between availability light nutrients enabled...
The temporal pattern of river metabolism was estimated for high-order rivers (5–7th) in the Daly watershed, tropical Australia, during dry season (May–October) when discharge supplied predominantly by groundwater. Rates photosynthesis (P) and respiration (R) were calculated at 4 sites using open-channel method based on a model river's O2 budget measured diurnal cycles dissolved concentrations temperatures. shallow (average depth = 0.8 m), clear (1–2 NTU), had low nutrients (≤15 µg/L soluble...
Microbial source tracking is an area of research in which multiple approaches are used to identify the sources elevated bacterial concentrations recreational lakes and beaches. At our study location Darwin, northern Australia, water quality harbor generally good, however dry-season beach closures due Escherichia coli enterococci counts a cause for concern. The these high bacteria currently unknown. To address this, we sampled sewage outfalls, other potential inputs, such as urban rivers...
Summary 1. The cellular nutrient contents of microalgae, when growing at or approaching maximum rates, approximate the Redfield C : N P (molar) ratio 106 16 Deviations from this optimal can be used to infer limitation microalgal growth. However, may not applicable macroalgae, which are distinguished microalgae by forming a thallus that is discrete structure visible naked eye. utility growth macroalgae was tested for Spirogyra fluviatilis in field experiment conducted tropical Australia. 2....
Current speed could affect algal responses to river eutrophication and flow regulation via its influence on nutrient availability benthic algae. In laboratory experiments, the thickness of diffusive boundary layer decreases with increasing current speed, enhancing rates mass transfer by molecular diffusion across cell wall. rivers streams, this phenomenon may be masked grazing physical losses. We used a 10-wk field experiment test hypothesis that response algae addition was function speed....
The dissolved oxygen concentrations in Darwin River Reservoir (DRR) and Manton (MRR), both located the wet/dry tropics of Australia, were investigated over an 8‐year period. Average lower MRR than DRR, indicating dominance consumptive processes not compensated by photosynthetic production oxygen, despite MRR’s higher chlorophyll a concentration. With onset thermal stratification, hypolimnion each reservoir was depleted at average rates 3.4–7.1 mg L −1 month . These are reported for temperate...
Analysis of otolith strontium isotope ratios ( 87 Sr/ 86 Sr) is an increasingly utilized approach for studying fish migration. We analysed surface and ground water from the Daly River catchment in wet–dry tropics northern Australia over 2 years. Analyses Sr were also conducted freshwater sooty grunter (Hephaestus fuliginosus) putatively diadromous diamond mullet (Liza ordensis). Spatial variation was high (range: 0.71612–0.78059), there strong seasonality Sr, with highest values wet season....
Abstract The Mary River, in the Australian wet/dry tropics, flows seasonally to inundate a coastal floodplain. In dry season, river reduces series of disconnected lakes located along main channel. This paper examines impact riverine inflow, at beginning wet on limnology Shady Camp Lake, and addresses broader water quality management issues. first season flow River carried high biological oxygen demand that reduced lake's concentration. resulting hypoxic conditions prompted fish avoidance...
Abstract This paper furthers the understanding of Nietzsche's project increasing prevalence higher individuals. I do this by opposing dominant tendency in Nietzschean scholarship constructing a single ideal‐type. argue that Nietzsche actually describes multiple types, with incommensurable physiological and psychological characteristics, attempts to collapse these into one type obscure nuance richness his thought. Furthermore, claim types are not ahistorical ideals; instead, their emergence...
Under high flows, the biomass of riverine phytoplankton can be constrained by short transport times and advective losses. However, under slower flows longer times, secondary factors sometimes their interaction with flow may constrain biomass. To contribute to a wider understanding conditions that biomass, we tested hypothesis Daly River (tropical Australia) was time during dry-season base flow. The river is virtually undisturbed, oligotrophic nutrient concentrations dry season. most...
Storm-flow disturbances are frequent during the wet season of Australian tropical savannas. We examined benthic algal resistance and resilience in open-canopy streams Daly River watershed. Storm flows occurred every 2 to 3 d at 1st- 4th-order sites, with sharp rises falls relatively long periods shallow, low-turbidity base flow. At a 5th-order site, storm-flow duration was longer were deeper more turbid. hypothesized that: 1) storm flow would dislodge biomass, 2) baseflow biomass be low, 3)...
Top-down and bottom-up forces (consumer resource limitation, respectively) influence biomass of primary producers consumers in natural food webs. Few investigators experimentally examine both concert, especially the tropics. Tropical systems probably are more sensitive than temperate to eutrophication other disturbances, such as destruction riparian canopy cover, because wide windows ecological opportunity. We examined relative importance top-down effects at 2 sites Edith River Australian...