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- Seagrasses -- Ecology -- Western Australia -- Jurien Bay (2)
- Cetacea|xCounting -- Western Australia (1)
- Image processing -- Digital techniques (1)
- Kelps -- Western Australia -- Perth Metropolitan Area (1)
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- Marine biology -- Western Australia -- Cockburn Sound (1)
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- Marine fishes -- Habitat (1)
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- Sabellida -- Western Australia -- Cockburn Sound (1)
- Seagrasses -- Ecology -- Western Australia -- Perth Metropolitan Area (1)
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- Seagrasses ecology (1)
- Stable isotopes in ecological research (1)
Articles 1 - 9 of 9
Full-Text Articles in Marine Biology
Do Different Levels Of Fishing Pressure, Through Spatial Management, Influence Communities And Ecological Interactions In Seagrass Meadows In South Western Australia?, Karina Inostroza
Theses : Honours
Marine Protected Areas (MPAs) are internationally recognised as a significant spatial management and cost-effective strategy to restore and conserve the marine ecosystems structure and function from human impact. MPAs have been declared with the aim to address a single or a set of management objectives in response to anthropogenic threats, such as fishing, which can have repercussions on biodiversity through indirect interactions or top-down control within an ecosystem or across ecosystems where consumers migrate to forage. However, this indirect impact of fishing remains poorly understood, and as a consequence, the effectiveness of MP As in conserving those ecological processes and …
The Use Of Detached Kelp (Ecklonia Radiata) By Seagrass-Associated Mesograzers In Temperate South-Western Australia, Christopher Doropoulos
The Use Of Detached Kelp (Ecklonia Radiata) By Seagrass-Associated Mesograzers In Temperate South-Western Australia, Christopher Doropoulos
Theses : Honours
The movement of nutrients and organisms between habitats provide important spatial subsidies on local and regional scales, resulting in increased primary and secondary production, especially where inputs supplement habitats of relatively low levels of comparable resources. In coastal south-western Australia, the brown kelp, Ecklonia radiata, is produced in large quantities on offshore reefs from where it detaches and passes through neighbouring habitats. This allochthonous resource is present in large quantities in seagrass meadows and thereby potentially influences the trophic dynamics of this habitat, providing an additional food source for grazers to those produced in situ. This study investigated the effects …
The Effects Of Light Reduction Treatments On Mobile Epifaunain An Amphibolis Griffithii (Black) Den Hartog Seagrass Ecosystem, Helen Barwick
The Effects Of Light Reduction Treatments On Mobile Epifaunain An Amphibolis Griffithii (Black) Den Hartog Seagrass Ecosystem, Helen Barwick
Theses : Honours
One of the main anthropogenic disturbances to seagrass meadows in Australia is reduction in light availability, through nutrient enrichment or suspended sediments. Dredging can create suspended sediment plumes from the expulsion of particulates into the water column and in tum reduces light penetration to seagrass ecosystems. Preliminary investigations have demonstrated that light reduction for different intensities and durations results in reduced seagrass and epiphytic algae biomass. The main aim of this study was to determine the effects of different intensities and durations of light reduction on epifaunal assemblages in Amphibolis griffithii seagrass meadows in Jurien Bay, Western Australia. This was …
Determining Carbon And Nitrogen Stable Isotope Discrimination For Marine Consumers, Emily N. Gates
Determining Carbon And Nitrogen Stable Isotope Discrimination For Marine Consumers, Emily N. Gates
Theses : Honours
The application of stable isotope ratios to food web studies is increasing, and the use of generalised discrimination values (0.4±1.4%0 for δ13C and 3.4±1.1%0 for δ15N), which are being widely applied to many studies, may not be valid. The broad objective of this study was to evaluate the assumption that these discrimination values are applicable to a range of benthic marine consumers, and therefore appropriate to be used in trophic analyses using carbon (C) and nitrogen (N) stable isotopes in marine food webs. The first aim was to determine if there were differences in …
Automated Photo-Identification Of Cetaceans : An Integrated Software Solution, Daniel Griggs
Automated Photo-Identification Of Cetaceans : An Integrated Software Solution, Daniel Griggs
Theses : Honours
This study investigates current techniques used for automated photo-identification of cetaceans (i.e. dolphins and whales). The primary focus constitutes various techniques that can be applied to identify and extract dorsal fins from digital photographs. A comprehensive analysis of these techniques demonstrates the most effective software solution. To further support this analysis, four prototypes are developed to demonstrate the effectiveness of each technique in a practical environment. The analysis bases its final conclusions on test results generated from these prototype software examples. Final conclusions provide recommendations for an effective, accurate, and practical software solution. This software solution allows dorsal fins to …
Effects Of Temporary Par Reduction On The Seagrass Amphibolis Griffithii (Black) Den Hartog, Paul R. Mackey
Effects Of Temporary Par Reduction On The Seagrass Amphibolis Griffithii (Black) Den Hartog, Paul R. Mackey
Theses : Honours
Declines in seagrass health and distribution are commonly caused through human induced reductions in the availability of photosynthetically active radiation (PAR). These reductions can result from a variety of human-induced perturbations, including channel dredging. The impetus for the research was driven by the broad-scale degradation of the ecologically important southern-Australian endemic seagrass Amphibolis griffithii (Black) den Hartog in Champion Bay, Geraldton, Western Australia. The study investigated the affects of reduced PAR on A. griffithii and identified responses that may be useful in developing management triggers to minimise the impact of PAR limitation events. The study was carried out during late …
Does Plant Morphology Influence Fish Fauna Associated With Seagrass Meadows?, Michael C. Burt
Does Plant Morphology Influence Fish Fauna Associated With Seagrass Meadows?, Michael C. Burt
Theses : Honours
Three distinct seagrass habitats were sampled to determine whether fish assemblages differed between meadows comprising of different seagrass species with different morphological characteristics and whether plant morphology influences species assemblages. Three seagrass habitats consisting of Posidonia sinuosa, Posidonia coriacea and meadows of a mixture of P. coriacea and Heterozostera tasmanica in the Success Bank region, off the coast of Fremantle, Western Australia were selected. For each habitat, sampling was carried out using a 1m wide beam trawl over a distance of 50m at six replicated locations, on three occasions between June and September 2002. Seagrass samples were collected at each …
The In Vitro Propagation Of Seagrasses : Halophila Ovalis, Ruppia Megacarpa And Posidonia Coriacea, Melissa Grace Henry
The In Vitro Propagation Of Seagrasses : Halophila Ovalis, Ruppia Megacarpa And Posidonia Coriacea, Melissa Grace Henry
Theses : Honours
Seagrass communities are of high ecological and economic significance. They provide a nursery area for commercial and recreational juvenile fish and crustacea. Seagrasses also play an important role in influencing the structure and function of many estuarine and nearshore marine environments. Unfortunately, the decline of seagrasses, as a result of human impact, has increased in recent years. This decline has become a major problem throughout the world. Current methods used to restore degraded seagrass beds are limited, the most promising being transplanting material from healthy donor beds. This approach is expensive because it is labor intensive and damages the donor …
The Filtration Rate, Oxygen Consumption And Biomass Of The Introduced Polychaete Sabella Spallanzanii Gmelin Within Cockburn Sound : Can It Control Phytoplankton Levels And Is It An Efficient Filter Feeder?, Geordie Clapin
Theses : Honours
Sabella spallanzanii, a filter feeding, sabellid polychaete worm which is common in the Mediterranean Sea, was recently discovered in Cockburn Sound, Western Australia. The species has been in Port Phillip Bay, Victoria for about 10 years, where it has spread widely, competes with native species and has economic impacts on the local scallop fishery. In Cockburn Sound, S. spallanzanii has colonised a shallow, sandy area known as the Southern Flats, reaching a mean biomass of 258 gDW m2 , as well as almost all artificial structures such as jetties and navigational marker pylons. A large biomass of this introduced …