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Comparative phylogeography and patterns of diversification in Amazonian fishes. I anticipate that this project will increase the research profile of Australia in the international scientific community by answering fundamental questions about the origin of biodiversity in the world's most diverse ecosystem, the lowland forests of central Amazonia. This will be achieved by analysing what will be the most comprehensive phylogeographic data set ever generated for Amazonian organisms. The project wil ....Comparative phylogeography and patterns of diversification in Amazonian fishes. I anticipate that this project will increase the research profile of Australia in the international scientific community by answering fundamental questions about the origin of biodiversity in the world's most diverse ecosystem, the lowland forests of central Amazonia. This will be achieved by analysing what will be the most comprehensive phylogeographic data set ever generated for Amazonian organisms. The project will provide information for comparing with patterns seen in the Australian wet tropics and will be inspirational for studies on population diversification of Australian fishes. Read moreRead less
Trophic cascades in Australian seagrasses: linking nutrients to survival and growth of commercially-important fishes. Despite its high conservation status and importance to commercial and recreational fisheries, seagrass is still declining in Australian waters. By investigating a trophic cascade that links nutrient pollution to the growth and survivorship of seagrass and commercially-important juvenile fishes, our study fills knowledge gaps crucial for improved future management of seagrass hab ....Trophic cascades in Australian seagrasses: linking nutrients to survival and growth of commercially-important fishes. Despite its high conservation status and importance to commercial and recreational fisheries, seagrass is still declining in Australian waters. By investigating a trophic cascade that links nutrient pollution to the growth and survivorship of seagrass and commercially-important juvenile fishes, our study fills knowledge gaps crucial for improved future management of seagrass habitats. The primary outcome of this study will be a model that can predict how changes in nutrient pollution will influence population dynamics of commercially-important fish species supported by seagrass. This information has, therefore, direct relevance to managers of estuarine and coastal environments at all levels of government - local, state and federal.Read moreRead less
Prediction of fishery year-class-strengths from larval growth and zooplankton size structure. The abundance of young fish produced in the ocean each year is highly variable, and banks or managers need to prepare for these future changes when the fish reach market size. Therefore many nations conduct special trawl surveys of juvenile fish each year, but these are expensive, particularly when Australia has over 200 commercially harvested fish. We propose that the growth of fish larvae, recorded as ....Prediction of fishery year-class-strengths from larval growth and zooplankton size structure. The abundance of young fish produced in the ocean each year is highly variable, and banks or managers need to prepare for these future changes when the fish reach market size. Therefore many nations conduct special trawl surveys of juvenile fish each year, but these are expensive, particularly when Australia has over 200 commercially harvested fish. We propose that the growth of fish larvae, recorded as daily growth rings within the earstone of undersized fish from the fishery, could predict future abundance. We will link growth to a cost-effective assessment of their zooplankton prey in spawning areas that lead to Australia's South East Trawl region.Read moreRead less
Stocking of fish and prawns at ecologically determined densities into Australian estuaries. Increasing numbers of people like to go fishing, and to catch a fish, which translates into tourism income and aquaculture business. Restocking is a fisheries management option when the natural supply or survival of larvae is limited. This study will determine for the first time the ecologically appropriate abundance of small mulloway and prawns that an estuary can sustain. We will assess the extra eff ....Stocking of fish and prawns at ecologically determined densities into Australian estuaries. Increasing numbers of people like to go fishing, and to catch a fish, which translates into tourism income and aquaculture business. Restocking is a fisheries management option when the natural supply or survival of larvae is limited. This study will determine for the first time the ecologically appropriate abundance of small mulloway and prawns that an estuary can sustain. We will assess the extra effort needed to release larvae into particular key habitats, and develop new technologies to identify our larvae from the wild. Our findings will be relevant to restocking of Australia's inland rivers, which at present has little ecological basis.Read moreRead less
Ecological impacts of QX Oyster disease and its management strategies. QX disease is responsible for mass mortality of oysters, and, as a result, economic and job losses. QX disease also threatens ecosystem services provided by wild oysters, such as biodiversity enhancement and fish production. This project will provide estuarine managers with information about how proposed QX management solutions will impact wild oyster populations and vital ecosystem services. It will also contribute to traini ....Ecological impacts of QX Oyster disease and its management strategies. QX disease is responsible for mass mortality of oysters, and, as a result, economic and job losses. QX disease also threatens ecosystem services provided by wild oysters, such as biodiversity enhancement and fish production. This project will provide estuarine managers with information about how proposed QX management solutions will impact wild oyster populations and vital ecosystem services. It will also contribute to training of early career researchers in strategies to ensure the sustainable use of Australia's biodiversity. As QX outbreaks appear to be increasing, this research and training is urgently needed to underpin management to ensure long-term sustainability of valuable estuarine resources.Read moreRead less
Intersexual arms races - are individuals within marine meta-populations less able to interbreed than assumed? A meta-population structure is thought to describe the inter-connected nature of many populations of marine animals with dispersive larvae. However, new theory predicts some of these populations might be not very inter-connected at all, despite larval migration. In some circumstances, independent, co-evolutionary arms races between sexes might develop within local populations, resulting ....Intersexual arms races - are individuals within marine meta-populations less able to interbreed than assumed? A meta-population structure is thought to describe the inter-connected nature of many populations of marine animals with dispersive larvae. However, new theory predicts some of these populations might be not very inter-connected at all, despite larval migration. In some circumstances, independent, co-evolutionary arms races between sexes might develop within local populations, resulting in individuals becoming increasingly less able to interbreed freely. I will directly test for this, measuring how successfully broadcast spawners can cross-fertilise across populations. This will reveal the genetic structure of these populations and if these animals really do live in a meta-population.Read moreRead less