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Journal articles on the topic 'Swan-Canning Estuary'

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Published: 4 June 2021
Last updated: 31 January 2023

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1

Masini, R. J., and Arthur J. McComb. "Production by microphytobenthos in the Swan-Canning Estuary." Hydrological Processes 15, no. 13 (2001): 2519–35. http://dx.doi.org/10.1002/hyp.290.

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2

Peters, Norman E., and Robert Donohue. "Nutrient transport to the Swan-Canning Estuary, Western Australia." Hydrological Processes 15, no. 13 (2001): 2555–77. http://dx.doi.org/10.1002/hyp.304.

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3

Thompson, Peter A. "Temporal variability of phytoplankton in a salt wedge estuary, the Swan-Canning Estuary, Western Australia." Hydrological Processes 15, no. 13 (2001): 2617–30. http://dx.doi.org/10.1002/hyp.289.

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4

Rippingale, RJ, and SJ Kelly. "Reproduction and survival of Phyllorhiza punctata (Cnidaria: Rhizostomeae) in a seasonally fluctuating salinity regime in Western Australia." Marine and Freshwater Research 46, no. 8 (1995): 1145. http://dx.doi.org/10.1071/mf9951145.

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Although medusae of the scyphozoan Phyllorhiza punctata are abundant in the Swan-Canning estuary during summer, they are absent when surface waters are dominated by low-salinity runoff water following winter rains. In the laboratory, scyphistomae of P. punctata are shown to survive in conditions of temperature and salinity that occur in the estuary during winter in waters deeper than 5 m. It is postulated that areas of deep water provide a winter refuge for scyphistomae and that asexual production of both ciliary buds and ephyrae enables rapid growth of the P. punctata population in the spring of each year.
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5

Atkins, R., T. Rose, R. S. Brown, and M. Robb. "The Microcystis cyanobacteria bloom in the Swan River - February 2000." Water Science and Technology 43, no. 9 (May 1, 2001): 107–14. http://dx.doi.org/10.2166/wst.2001.0518.

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In February 2000 the Swan-Canning estuary in Western Australia experienced a record bloom of the toxic cyanobacteria Microcystis aeruginosa. At its height, concentrations of M. aeruginosa reached integrated water column cell counts of 15,000/ml and formed bright green scums in sheltered bays, where counts of 130 million cells/ml were recorded. Due to public health concerns parts of the river were closed from 10 to 22 February 2000. Two unseasonably large summer rain events in early and late January 2000 created conditions for the bloom. Freshwater runoff, estimated at 270 GL, was enough to fill the Swan-Canning estuary five times over and brought with it high levels of nutrients, mainly nitrogen (>2.0mg/L TN) and phosphorus (>0.15mg/L TP). A number of methods to reduce bloom accumulations were tried, including an attempt to increase the salinity of the surface water above the critical 10 ppt level for Microcystis; using a bentonite clay and poly-aluminium chloride mixture to flocculate and sink the algae; and sucking up scums using oil spill equipment. Over 900 tonnes of M. aeruginosa were removed and safely disposed using sewage treatment facilities. The bloom collapsed when the freshwater flush subsided and seawater intrusion from the Indian Ocean re-established itself, raising the salinities above the tolerance of Microcystis.
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6

Astill, Helen, and Paul S. Lavery. "The dynamics of unattached benthic macroalgal accumulations in the Swan-Canning Estuary." Hydrological Processes 15, no. 13 (2001): 2387–99. http://dx.doi.org/10.1002/hyp.292.

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7

Greenop, B., K. Lovatt, and M. Robb. "The use of artificial oxygenation to reduce nutrient availability in the Canning River, Western Australia." Water Science and Technology 43, no. 9 (May 1, 2001): 133–44. http://dx.doi.org/10.2166/wst.2001.0524.

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Artificial oxygenation has been used for two summer periods to improve the water quality of the Canning River in Perth, Western Australia. The project is part of the Swan Canning Cleanup Program, which aims to reduce the frequency and severity of nuisance and toxic algal blooms in the Swan-Canning estuary. The trials have proved that oxygenation has increased the dissolved oxygen concentrations in the water column, particularly in the bottom waters where dissolved oxygen concentrations are frequently below a critical level of three milligrams per litre. Oxygenation has had a positive impact on nutrient concentrations in the water column and nitrogen cycling processes. Reductions in nutrient concentrations were highlighted by drops in ammonium and total phosphorus concentrations of 97% and 64% following the recommencement of oxygenation after a plant shutdown. Results of a microbiological study combined with the data analysis indicate that the number of nitrifying microbes have increased due to oxygenation. However, comparisons between oxygenated and control areas were inconclusive about the ability of the oxygenation plant to reduce total nitrogen and phosphorus levels. This could be explained by factors such as spatial variability, water flow during the trials and measurement limitations in the monitoring program. Future work will concentrate on assessing the impact of the oxygenation plant on nutrient concentrations.
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8

Gerritse, R. G., P. J. Wallbrink, and A. S. Murray. "Accumulation of Phosphorus and Heavy Metals in the Swan-Canning Estuary, Western Australia." Estuarine, Coastal and Shelf Science 47, no. 2 (August 1998): 165–79. http://dx.doi.org/10.1006/ecss.1998.0349.

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9

Wright, Joné, Renae K. Hovey, Harriet Paterson, Jessica Stead, and Andrew Cundy. "Microplastic accumulation in Halophila ovalis beds in the Swan-Canning Estuary, Western Australia." Marine Pollution Bulletin 187 (February 2023): 114480. http://dx.doi.org/10.1016/j.marpolbul.2022.114480.

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10

Smith, Anthony J., and Jeffrey V. Turner. "Density-dependent surface water-groundwater interaction and nutrient discharge in the Swan-Canning Estuary." Hydrological Processes 15, no. 13 (2001): 2595–616. http://dx.doi.org/10.1002/hyp.303.

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11

Webb, D., and Marthe Monique Gagnon. "MFO induction potential of fish species native to the Swan-Canning Estuary, Western Australia." Environmental Toxicology 17, no. 1 (2002): 87–92. http://dx.doi.org/10.1002/tox.10030.

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12

Huang, Peisheng, Kerry Trayler, Benya Wang, Amina Saeed, Carolyn E. Oldham, Brendan Busch, and Matthew R. Hipsey. "An integrated modelling system for water quality forecasting in an urban eutrophic estuary: The Swan-Canning Estuary virtual observatory." Journal of Marine Systems 199 (November 2019): 103218. http://dx.doi.org/10.1016/j.jmarsys.2019.103218.

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13

Cottingham, Alan, Andrew Bossie, Fiona Valesini, James R. Tweedley, and Eve Galimany. "Quantifying the Potential Water Filtration Capacity of a Constructed Shellfish Reef in a Temperate Hypereutrophic Estuary." Diversity 15, no. 1 (January 13, 2023): 113. http://dx.doi.org/10.3390/d15010113.

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Shellfish reefs have been lost from bays and estuaries globally, including in the Swan-Canning Estuary in Western Australia. As part of a national program to restore the ecosystem services that such reefs once provided and return this habitat from near extinction, the mussel Mytilus galloprovincialis was selected for a large-scale shellfish reef construction project in this estuary. To assess the potential filtration capacity of the reef, estuary seston quality, mussel feeding behavior, and valve gape activity were quantified in the laboratory and field during winter and summer. In general, estuary water contained high total particulate concentrations (7.9–8.7 mg L−1). Standard clearance rates were greater in winter (1.9 L h−1; 17 °C) than in summer (1.3 L h−1; 25 °C), the latter producing extremely low absorption efficiencies (37%). Mussel valves remained open ~97% and ~50% of the time in winter and summer, respectively. They often displayed erratic behavior in summer, possibly due to elevated temperatures and the toxic microalgae Alexandrium spp. Despite numerous stressors, the reef, at capacity, was estimated to filter 35% of the total volume of the estuary over winter, incorporating 42.7 t of organic matter into mussel tissue. The reefs would thus make a substantial contribution to improving estuary water quality.
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14

Horner Rosser, S. M. J., and Peter A. Thompson. "Phytoplankton of the Swan-Canning Estuary: a comparison of nitrogen uptake by different bloom assemblages." Hydrological Processes 15, no. 13 (2001): 2579–94. http://dx.doi.org/10.1002/hyp.288.

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15

Hamilton, David P., and Jeffrey V. Turner. "Integrating research and management for an urban estuarine system: the Swan-Canning Estuary, Western Australia." Hydrological Processes 15, no. 13 (2001): 2383–85. http://dx.doi.org/10.1002/hyp.299.

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16

Webb, Diane, Marthe Monique Gagnon, and Tom Rose. "Metabolic enzyme activities in black bream (Acanthopagrus butcheri) from the Swan-Canning Estuary, Western Australia." Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology 141, no. 4 (August 2005): 356–65. http://dx.doi.org/10.1016/j.cbpc.2005.07.010.

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17

Twomey, L., and J. John. "Effects of rainfall and salt-wedge movement on phytoplankton succession in the Swan-Canning Estuary, Western Australia." Hydrological Processes 15, no. 13 (2001): 2655–69. http://dx.doi.org/10.1002/hyp.287.

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18

Tweedley, James R., Chris S. Hallett, Richard M. Warwick, K. Robert Clarke, and Ian C. Potter. "The hypoxia that developed in a microtidal estuary following an extreme storm produced dramatic changes in the benthos." Marine and Freshwater Research 67, no. 3 (2016): 327. http://dx.doi.org/10.1071/mf14216.

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Runoff from an extreme storm on 22 March 2010 led, during the next 3 months, to the formation of a pronounced halocline and underlying hypoxia in the upper reaches of the microtidal Swan–Canning Estuary. Benthic macroinvertebrates were sampled between January 2010 and October 2011 at five sites along 10km of this region. By mid-April, the number of species, total density, Simpson’s evenness index and taxonomic distinctness had declined markedly, crustaceans had disappeared and the densities of annelids and molluscs had declined slightly. These faunal attributes (except Simpson’s index) and species composition did not recover until after the end of the hypoxia. The survival of annelids and loss of crustaceans in this period reflects different sensitivities of these taxa to severe environmental stress. The results emphasise that microtidal estuaries with long residence times are highly vulnerable to the effects of environmental perturbations, particularly during warmer periods of the year.
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19

Hillman, K., A. J. McComb, and D. I. Walker. "The distribution, biomass and primary production of the seagrass Halophila ovalis in the Swan/Canning Estuary, Western Australia." Aquatic Botany 51, no. 1-2 (July 1995): 1–54. http://dx.doi.org/10.1016/0304-3770(95)00466-d.

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20

Donohue, Robert, W. Angus Davidson, Norman E. Peters, Samuel Nelson, and Brad Jakowyna. "Trends in total phosphorus and total nitrogen concentrations of tributaries to the Swan-Canning Estuary, 1987 to 1998." Hydrological Processes 15, no. 13 (2001): 2411–34. http://dx.doi.org/10.1002/hyp.300.

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21

Linderfelt, William R., and Jeffrey V. Turner. "Interaction between shallow groundwater, saline surface water and nutrient discharge in a seasonal estuary: the Swan-Canning system." Hydrological Processes 15, no. 13 (2001): 2631–53. http://dx.doi.org/10.1002/hyp.302.

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22

Connell, E. L., and D. I. Walker. "Nutrient cycling associated with the seagrassHalophila ovalis in the Swan-Canning Estuary based on seasonal variations in biomass and tissue nutrients." Hydrological Processes 15, no. 13 (2001): 2401–9. http://dx.doi.org/10.1002/hyp.291.

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23

Cui, Lei, Paul Cheong, Ridge Adams, and Thomas Johnson. "AmBot: A Bio-Inspired Amphibious Robot for Monitoring the Swan-Canning Estuary System." Journal of Mechanical Design 136, no. 11 (October 8, 2014). http://dx.doi.org/10.1115/1.4028094.

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This paper describes the AmBot, a centipede-inspired amphibious robot for monitoring the Swan-Canning River, the most important estuary system in Western Australia. The major challenge in developing such a robot lies in that the limited physical size of the robot allows only one type of propulsion system to be used both on land and on water. This is in contrast to large amphibious robots that use wheels or track systems when on land and switch to propellers when on water. The focus of this paper is on the design of a single propulsion method suited to a small-sized amphibious robot. To achieve this, centipede-inspired tracks were engineered with each track-piece consisting of an aluminum base and a polystyrene-block float. It was hypothesized that tracks fixed with floats might be able to provide effective actuation both on land and on water for small-sized robots. When on water, the tracks provide propulsion force and buoyancy so that the waterline is well controlled. When on land, the tracks effectively spread the contact force across multiblocks, leading to effective actuation and low pressure on the sandy terrain, hence protecting the beach ecosystem. Finite element analysis (FEA) was applied to optimize the main components of the AmBot for weight reduction without sacrificing functionality and safety. The AmBot uses an Android-based remote-control system via the Internet, where the accelerometer, gyroscope, global positioning system (GPS), and camera on the Android device provide integrated navigation and monitoring sensing. A prototype was developed to validate the proposed design by conducting empirical studies.
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24

Campbell, Theo I., James R. Tweedley, Danielle J. Johnston, and Neil R. Loneragan. "Crab Diets Differ Between Adjacent Estuaries and Habitats Within a Sheltered Marine Embayment." Frontiers in Marine Science 8 (February 18, 2021). http://dx.doi.org/10.3389/fmars.2021.564695.

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Portunid crabs contribute to significant commercial and recreational fisheries globally and are commonly fished in estuaries and/or marine embayments, which are amongst the most degraded of all aquatic ecosystems. Portunus armatus were collected seasonally between April and February from five locations across three systems in temperate south-western Australia. The dietary composition of crabs was quantified and compared between two estuaries (Peel-Harvey and Swan-Canning) and a sheltered marine embayment (Cockburn Sound) containing three distinct habitats: shallow seagrass, shallow sand and deep sand. Overall, crabs ingested large volumes of bivalves (both live organisms and dead shell), polychaetes, crustaceans (e.g., amphipods, small decapods), and smaller volumes of teleosts, echinoderms and plant material (seagrass, algae). Analysis of Similarities showed that dietary composition varied significantly among the five locations (two estuaries and three habitats within Cockburn Sound) and seasons, with greater location than seasonal differences in the two estuaries. Diets were most distinct in the Cockburn Sound seagrass due to greater volumes of decapods and teleosts and smaller volumes of bivalve shell consumed in this habitat. Crabs from both estuaries consumed greater quantities of bivalves than those from Cockburn Sound. Seasonal differences in both estuaries were greatest between summer and winter, with a more diverse range of prey and large quantities of bivalves ingested in summer, whereas small bivalves and bivalve shell in the Peel-Harvey and polychaetes and other crustaceans in the Swan-Canning, were consumed in greater quantities in winter. The summer diet in the Peel-Harvey Estuary in the current study was compared to that 20 years previous and with documented change in the benthic macroinvertebrate fauna. Currently, crabs consume smaller volumes of high-calorie prey, i.e., polychaetes, small bivalves and teleosts, and instead ingest greater proportions of calcareous material than previously. This marked shift in dietary composition parallels changes in benthic macroinvertebrates in the Peel-Harvey Estuary. Overall, prey availability appears to be the major factor influencing the spatial and temporal differences in P. armatus diets in these three coastal systems.
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25

Martin, Belinda C., Marta Sanchez Alarcon, Deirdre Gleeson, Jen A. Middleton, Matthew W. Fraser, Megan H. Ryan, Marianne Holmer, Gary A. Kendrick, and Kieryn Kilminster. "Root microbiomes as indicators of seagrass health." FEMS Microbiology Ecology 96, no. 2 (December 16, 2019). http://dx.doi.org/10.1093/femsec/fiz201.

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ABSTRACT The development of early warning indicators that identify ecosystem stress is a priority for improving ecosystem management. As microbial communities respond rapidly to environmental disturbance, monitoring their composition could prove one such early indicator of environmental stress. We combined 16S rRNA gene sequencing of the seagrass root microbiome of Halophila ovalis with seagrass health metrics (biomass, productivity and Fsulphide) to develop microbial indicators for seagrass condition across the Swan-Canning Estuary and the Leschenault Estuary (south-west Western Australia); the former had experienced an unseasonal rainfall event leading to declines in seagrass health. Microbial indicators detected sites of potential stress that other seagrass health metrics failed to detect. Genera that were more abundant in ‘healthy’ seagrasses included putative methylotrophic bacteria (e.g. Methylotenera and Methylophaga), iron cycling bacteria (e.g. Deferrisoma and Geothermobacter) and N2 fixing bacteria (e.g. Rhizobium). Conversely, genera that were more abundant in ‘stressed’ seagrasses were dominated by putative sulphur-cycling bacteria, both sulphide-oxidising (e.g. Candidatus Thiodiazotropha and Candidatus Electrothrix) and sulphate-reducing (e.g. SEEP-SRB1, Desulfomonile and Desulfonema). The sensitivity of the microbial indicators developed here highlights their potential to be further developed for use in adaptive seagrass management, and emphasises their capacity to be effective early warning indicators of stress.
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26

O’Dea, Caitlyn M., Paul S. Lavery, Chanelle L. Webster, and Kathryn M. McMahon. "Increased extent of waterfowl grazing lengthens the recovery time of a colonizing seagrass (Halophila ovalis) with implications for seagrass resilience." Frontiers in Plant Science 13 (August 29, 2022). http://dx.doi.org/10.3389/fpls.2022.947109.

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Herbivore distributions and abundance are shifting because of climate change, leading to intensified grazing pressure on foundation species such as seagrasses. This, combined with rapidly increasing magnitudes of change in estuarine ecosystems, may affect seagrass resilience. While the overall resilience of seagrasses is generally well-studied, the timeframes of recovery has received comparatively little attention, particularly in temperate estuaries. We investigated how the recovery time (RT) of seagrass is affected by simulated grazing in a southwestern Australian estuary. Whilst excluding swans, we simulated different grazing intensities (25, 50, 75, and 100% removal from 1 m2 plots) at four locations in the Swan-Canning Estuary, Western Australia during summer and tracked the recovery of seagrass over 3 months, using seagrass cover as the main measure of recovery. We found that seagrass recovered within 4–6 weeks from the lower grazing intensities (25 and 50%) and 7–19 weeks from the higher grazing intensities (75 and 100%) across the estuary. Increased grazing intensity led to not only longer recovery times (RTs), but also greater variability in the RT among experimental locations. The RT from the higher grazing intensities at one location in particular was more than double other locations. Seagrass recovery was through vegetative mechanisms and not through sexual reproduction. There was a significant grazing treatment effect on seagrass meadow characteristics, particularly belowground biomass which had not recovered 3 months following grazing. As the pressure of climate change on estuarine environments increases, these quantified RTs for seagrass provide a baseline for understanding grazing pressure as a singular disturbance. Future work can now examine how grazing and other potentially interacting pressures in our changing climate could impact seagrass recovery even further.
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27

Gu, Ruiting, John Statton, Susi Rahmawati, Renae Hovey, Yi Zhou, Jianwu Tang, Shuo Yu, and Gary A. Kendrick. "Seed bank dynamics and quality in the seagrass Halophila ovalis along estuarine salinity gradients—a case in the Swan-Canning Estuary." Frontiers in Marine Science 9 (November 22, 2022). http://dx.doi.org/10.3389/fmars.2022.1025615.

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The seed bank of Halophila ovalis is crucial for resilience to disturbance through re-establishment. Understanding seasonal changes in abundance and quality of seeds in natural seed banks is critical for seed-based restoration. We selected an estuary in southwestern Australia and investigated the seasonal changes of seed distribution and viability in H. ovalis seed banks. We also adapted an X-ray viability test used for terrestrial seeds to test the viability of H. ovalis seeds. We then simulated the effect of low salinity on seed viability through a short-term indoor experiment. Seed density was significantly different between sites and seasons (0 to 43590 seeds·m-2), and the highest seed density in the seed banks was found after the reproductive season (May). The proportion of viable seeds in the seed bank was less than 22%, and was not subjected to substantial seasonal variability. The density of seeds in the seed bank decreased in spring, which indicated winter conditions were not prompt seed loss. We also predicted that extreme rainfall events and the resulting extremely low salinity would significantly reduce seed viability, and could decrease in seed germination; limit population recruitment. As it rapidly colonizes marine sediments from seeds, H. ovalis was considered an ideal seagrass for restoration purposes. Our results provide physiological information for H. ovalis seed banks to support seed-based restoration plans. Such understanding would enable accurate predictions about seagrass population resilience to extreme climate events in estuaries, where variable and extremely low salinity may limit seagrass population recovery from seeds through decreasing their viability.
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