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Surviving in a toad-colonised landscape: manipulating predator behaviour to reduce the impact of the cane toad invasion. Invasive species pose a major threat to biodiversity; and within Australia, cane toads are widely viewed as one of the biggest such problems. Vigorous attempts at toad control have failed to slow the invasion front, and toads are now entering the Kimberley region. If we can’t stop the toads, are there other ways to reduce the numbers of native predators killed by eating thes ....Surviving in a toad-colonised landscape: manipulating predator behaviour to reduce the impact of the cane toad invasion. Invasive species pose a major threat to biodiversity; and within Australia, cane toads are widely viewed as one of the biggest such problems. Vigorous attempts at toad control have failed to slow the invasion front, and toads are now entering the Kimberley region. If we can’t stop the toads, are there other ways to reduce the numbers of native predators killed by eating these poisonous invaders? Predators given nausea-inducing chemicals with their first toad meal rapidly learn to avoid cane toads as prey, enabling them to survive even where toads are present. The study will develop those methods for several vulnerable native species, including techniques for deployment of aversion-inducing baits in advance of the toad invasion.Read moreRead less
Sex and the generation gap: seasonal changes in sex allocation. Answering the question 'When is it better to produce more sons than daughters?' has shed important insights into fundamental questions in biology and led to theory that can be applied to problems in agriculture, fisheries and conservation. The project will extend the current theory to increase its applicability, and test it using an introduced pest fish.
Ecology, impact and control of cane toads on the southern invasion front. The invasion of cane toads has killed many native animals in tropical Australia, but the toads’ southern (NSW) invasion front remains unstudied. This project will build on recent research to understand how toads affect southern biodiversity, and will develop new ways to reduce that impact.
Discovery Early Career Researcher Award - Grant ID: DE230100373
Funder
Australian Research Council
Funding Amount
$447,320.00
Summary
The role of resource fluctuations in structuring microbial communities. The flow of nutrients through ecological systems fluctuates through time and yet the impact this variability has on the maintenance of biodiversity is poorly understood. Drawing on emerging theory and a tight integration of modelling and experiments in a model microbial system, this project aims to investigate the impact of modified nutrient regimes on the structure and stability of ecological communities. This project expec ....The role of resource fluctuations in structuring microbial communities. The flow of nutrients through ecological systems fluctuates through time and yet the impact this variability has on the maintenance of biodiversity is poorly understood. Drawing on emerging theory and a tight integration of modelling and experiments in a model microbial system, this project aims to investigate the impact of modified nutrient regimes on the structure and stability of ecological communities. This project expects to generate new knowledge at the forefront of research into diversity maintenance, ecosystem functioning and higher-order interactions. The outcomes should provide a deep mechanistic understanding of microbial community dynamics, with applications from animal health to environmental flows and insect pest management.Read moreRead less
Do microbes facilitate the invasion of marine plants? Worldwide, management of invasive species is limited by the understandings of processes that allow invasive species to establish and proliferate in a new environment. It is believed that marine microbes play a critical, but untested, role in the establishment of invasive marine macrophytes. This project aims to test the theory by integrating cutting edge microbial ecology with eukaryote ecology, two largely disparate research areas. Invasive ....Do microbes facilitate the invasion of marine plants? Worldwide, management of invasive species is limited by the understandings of processes that allow invasive species to establish and proliferate in a new environment. It is believed that marine microbes play a critical, but untested, role in the establishment of invasive marine macrophytes. This project aims to test the theory by integrating cutting edge microbial ecology with eukaryote ecology, two largely disparate research areas. Invasive species are a serious threat to biodiversity globally and cost more than $4 billion annually. This project aims to create new knowledge essential for safeguarding Australia’s marine ecosystems from invasive pests, and will place Australia at the forefront of invasion ecology.Read moreRead less
Preliminary Assessment Of The Distribution And Potential Impact Of The Introduced Seastar Asterias Amurensis In Tasmanian Waters
Funder
Fisheries Research and Development Corporation
Funding Amount
$17,896.00
Summary
Objectives: 1. Using available information assess the current and potential impact of the seastar Asterias amurensis on SE Australian fisheries, aquaculture and ecosystems
A Preliminary Assessment Of The Genetic Population Structure Of Asterias Amurensis In Tasmania
Funder
Fisheries Research and Development Corporation
Funding Amount
$38,343.00
Summary
Objectives: 1. Determine whether the introduced seastar is the southern sub-species, Japanese and Russian populations of Asterias amurensis versicolor or a northern sub-species 2. Determine whether the Tasmanian populations are derived from one or several introductions 3. Determine whether the invasion of Tasmanian waters has been accompanied by a loss of genetic variation with respect to native populations
Colonisation Of New South Wales By Non-indigenous Marine Species: Baseline Studies At Twofold Bay, NSW
Funder
Fisheries Research and Development Corporation
Summary
Objectives: 1. Provide an inventory of the fauna of Twofold Bay that is subject to regular discharge of ballast water. 2. Ascertain if any exotic species have become established in the Bay
NCCP: Defining Best Practice For Viral Susceptibility Testing Of Non-target Species To Cyprinid Herpesvirus 3 -a Discussion Paper Based On Systematic Quantitative Literature Reviews
Funder
Fisheries Research and Development Corporation
Funding Amount
$124,626.00
Summary
The National Carp Control Plan (NCCP), an initiative of the Australian government, aims to reduce common carp numbers in Australian waters. A key aspect of this plan is to use a biological control agent to kill common carp in waters of the Murray-Darling basin. Since 2008 CSIRO researchers have been investigating the potential for Cyprinid herpesvirus 3 (CyHV-3) to control common carp numbers in this region as well as exploring potential negative outcomes arising from the introduction of this ex ....The National Carp Control Plan (NCCP), an initiative of the Australian government, aims to reduce common carp numbers in Australian waters. A key aspect of this plan is to use a biological control agent to kill common carp in waters of the Murray-Darling basin. Since 2008 CSIRO researchers have been investigating the potential for Cyprinid herpesvirus 3 (CyHV-3) to control common carp numbers in this region as well as exploring potential negative outcomes arising from the introduction of this exotic virus. One critical issue is the potential for non-target species (NTS) to be infected and negatively affected by CyHV-3. Susceptibility studies performed in vitro and in vivo were undertaken and used to predict in situ outcomes. These studies indicated that NTS tested were not susceptible to CyHV-3. However, since the publication of these results, stakeholder groups have raised several concerns. These concerns must be resolved to mitigate against the infection of NTS by CyHV-3 and to ensure continued stakeholder engagement. Six areas of concern have been raised by stakeholders. 1. Immune-competency status of fish was not considered in susceptibility studies 2. Techniques used to determine viral infection were perceived to be unreliable 3. Undiagnosed mortalities of NTS were not adequately addressed 4. Positive PCR test results observed in NTS were not adequately explained 5. Only mature or advanced juvenile fish were assessed for susceptibility to CyHV-3 6. The range of NTS investigated for susceptibility was limited and did not include a number of species that may be exposed to CyHV-3 It is proposed that a discussion paper be prepared to examine these issues. This paper would determine if previous susceptibility testing for CyHV-3 in the NCCP adequately addressed those issues detailed above. Using the information collected, recommendations for susceptibility testing of NTS to CyHV-3 in the context of the NCCP would be presented. The current understanding of what constitutes best practice for viral susceptibility testing at the time of the review would also be discussed. This would include a commentary on the predictive capacity of in vitro and in vivo studies when translated to the in situ environment.
Objectives: 1. The overarching objective of this project is to investigate potential problems, limitations and concerns related to viral susceptibility testing of NTS to CyHV-3 in the context of the NCCP and to define what constitutes best practice in viral susceptibility testing. 2. Review and discuss the implications of immune-competency status in pathogen susceptibility testing of aquatic organisms. 3. Review the range of techniques for assessing viral infection in aquatic animals and evaluate their accuracy and reliability. 4. Discuss the occurrence and implications of undiagnosed mortalities and ‘false positives’ in pathogen susceptibility studies. 5. Determine, based on existing literature, potential differences in the susceptibility of larval, juvenile and mature fish to viruses. 6. Investigate, based on existing literature, the potential for fish and other aquatic organisms beyond those previously investigated by the NCCP to become infected by CyHV-3 as a result of actions of the NCCP. Read moreRead less
Rebuilding Ecosystem Resilience: Assessment Of Management Options To Minimise Formation Of ‘barrens’ Habitat By The Long-spined Sea Urchin (Centrostephanus Rodgersii) In Tasmania
Funder
Fisheries Research and Development Corporation
Funding Amount
$828,551.00
Summary
There is clearly potential for C. rodgersii barrens to cover ~50% of nearshore reefs on the east coast of Tasmania, as is already the case in NSW and the Kent Group in Bass Strait. This would reduce both the Tasmanian abalone and rock lobster fisheries by ~15%, with a loss of value totalling ~$25M (before processing). The need for a management response is self evident.
Large rock lobsters (=135 mm CL) are the key predators of C. rodgersii in Tasmania, and experiments have shown clearly ....There is clearly potential for C. rodgersii barrens to cover ~50% of nearshore reefs on the east coast of Tasmania, as is already the case in NSW and the Kent Group in Bass Strait. This would reduce both the Tasmanian abalone and rock lobster fisheries by ~15%, with a loss of value totalling ~$25M (before processing). The need for a management response is self evident.
Large rock lobsters (=135 mm CL) are the key predators of C. rodgersii in Tasmania, and experiments have shown clearly they can prevent sea urchin populations from building to the point where overgrazing occurs. There is urgent need to assess the viability of controlling C. rodgersii populations through changing current management of the rock lobster fishery, and through targeted removal by divers as a tactical response on small scales.
However, before management instruments are invoked in an attempt to minimise the risk of further development of barrens habitat or rehabilitate existing barrens, it is imperative to carefully evaluate the effectiveness of potential management strategies. The proposed research will provide the necessary information and knowledge base to enable robust management decisions.
The proposed work has strong support from managers and the fishing industry in Tasmania, is acknowledged as a high priority by the relevant RAGs, and addresses several high priorities on both the State and TAFI strategic research plans. Objectives: 1. To assess the effectiveness of translocating large rock lobsters (=135 mm CL) en masse as means of preventing formation of incipient barrens and rehabilitating incipient and extensive barrens. 2. To assess the effectiveness of a range of management options (e.g. imposing upper size limits and spatial management) in building the biomass of large (=135 mm CL) rock lobsters to levels sufficient to limit C. rodgersii populations. 3. To assess the effectiveness of killing or removing sea urchins by abalone divers during the conduct of their fishing activity, as a means of preventing formation of incipient barrens and rehabilitating incipient and extensive barrens. Read moreRead less