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• W13853841 abstract "Abstract Biodiversity can be conceptualised as a nested hierarchy of elements of biological organisation: gene, species, ecosystem and landscape. Integrating conservation of these levels of biodiversity through a comprehensive system of protection is challenging. At times, conservation management of these different levels can be conflicting. This thesis addresses the issue of conserving naturally restricted species in a fragmented landscape in Queensland, using a case study bioregion and species. The endangered species Acacia porcata occurs within a 3 km2 area in the highly fragmented Auburn-Banana subregion within the Brigalow Belt South bioregion. It provides a scientific basis for the conservation of a natural restricted vascular plant (Acacia porcata) known from a single location in a granite outcrop in south east Queensland. Three research questions are addressed: 1) How does detailed ecological and genetic information about threatened species contribute to conserving threatened species? 2) Does Queensland have the legislative and policy frameworks, based on protecting threatened ecosystems in fragmented landscapes, to also protect naturally rare plant species? 3) What strategies are required for protecting naturally restricted species? These questions are considered in the context of: the autecology of a naturally restricted species and how this information contributes to its management and conservation; the relationship between threatened species and ecosystems in a case study bioregion; and the existing legislative and policy frameworks in place in Queensland for protecting rare and threatened species. Conclusions are then drawn about improvements to protect naturally restricted species. To answer the above questions, I analysed field data collected over three years as a basis for the autecology and used laboratory technology for the genetic analysis of the species. I used a GIS analysis to support the assessment of the relationship between landscape fragmentation, threatened species and ecosystems. I assessed whether the Queensland legislative and policy frameworks for protecting rare species are appropriate and adequate for protecting the case study species qualitatively. vi I described the ecology, genetics and undertook a population viability analysis of Acacia porcata. The data show that A. porcata has the capacity to flower and produce viable seed. Establishment of new seedlings is dependent on fire and the number of seedlings fluctuates with mass germination following fire. Using a population viability analysis, I determined that a fire frequency of five years is required minimise extinction risk. A. porcata has high genetic variability and high gene flow between subpopulations. The main causes of rarity of A. porcata are likely to be the inter-relationship between its population dynamics and life history strategies that require fire for seedling generation in association with stochasticity related to fire events. Taxon age may be important in its capacity to survive as a very small, restricted population. The only known location of the species is a newly declared national park, with fire management the most critical requirement for its survival. I considered the relationship between threatened species and ecosystems in a landscape context in the Brigalow Belt South bioregion and found that the distribution of threatened species and ecosystems in the fragmented landscape are not coincidental and using ecosystems as a surrogate for biodiversity protection will not ensure the conservation of threatened plant species. All components of the Brigalow Belt South bioregion, including the relictual and variegated subregions, contribute to species survival and conservation priorities that focus only on large intact remnants will miss opportunities for securing the survival of threatened species in small remnant patches and in non-remnant areas. Any reserve selection program to improve the representation of threatened species in the protected area requires specific information about the location and range of threatened species. While a number of mechanisms do exist to protect naturally restricted species, a category recognising species with restricted distributions or low populations that are not directly under threat is highly desirable in recognition of the large number of endemic species within Australia. This would require legislative change at the State and Commonwealth levels. vii While there have been criticisms that recovery plans do not demonstrate a positive impact on threatened species status, such as changing its conservation status from endangered to vulnerable did not occur, I argue that such an expectation is unrealistic for naturally restricted species. Although the threats of extinction may be reduced through appropriate management, the naturally limited spatial distribution of the species is not likely to increase, resulting in A. porcata remaining of the endangered/critically endangered lists under IUCN and Australian legislation. Finally I recommend future research to pollinator/seed dispersal mechanisms and seedbank longevity and the further development of the population viability model to take this information into account. I also propose that a comprehensive case study to monitor the effects of climate change on naturally restricted species in Beeron National Park is established involving universities, national park managers and climate change scientist." @default.
• W13853841 created "2016-06-24" @default.
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• W13853841 date "2011-11-01" @default.
• W13853841 modified "2023-09-27" @default.
• W13853841 title "Protecting naturally restricted species in fragmented landscapes…A case study from the Brigalow Belt South bioregion, Queensland Australia." @default.
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