Environment Institute
Permanent URI for this community
Browse
Browsing Environment Institute by Issue Date
Now showing 1 - 20 of 6490
Results Per Page
Sort Options
Item Open Access Problems in plasma dynamics and fluid mechanics(Adelaide,, 1967) Wigley, Tom Michael Lampe; Dept. of Mathematical PhysicsItem Open Access The eocene megafossil flora of Nerriga, New South Wales / by Robert S. Hill(1980) Hill, Robert Stephen; Dept. of BotanyItem Metadata only Vegetation of North-eastern South Australia(Nature Conservation Society of S.A., 1981) Lewis, M.Item Open Access The biology and ecology of Clubiona species (Araneae : Clubionidae) and their scelionid parasitoids (Hymenoptera) / by Andrew Donald Austin(1982) Austin, Andrew Donald; Dept. of EntomologyItem Metadata only Women in environmental sciences: an investigation of increased female participation in environmental education and careers(Department of Employment, Education & Training, 1989) Lewis, M.; Schaffer, K.This study investigates student' motivation to pursue careers and courses in environmental sciences with particular reference to the differential experiences of males and females involved in non-traditional training and career areas for females. Although males and females were found to have much in common some important differences emerged in relation to perception of skills and abilities, experience of sexual bias, relationships with educators and the importance of certain role models. These results may have implications for further research, training and education programmes, teach staff/student relationships and the role of on-the-job supervisors.Item Open Access A molecular and evolutionary study of the [beta]-globin gene family of Sminthopsis crassicaudata / by Steven J.B. Cooper(1991) Cooper, Steven John Baynard; Dept. of GeneticsItem Metadata only Genetic evidence for extra-pair fertilisations in socially monogamous Short-tailed Shearwaters, Puffinus tenuirostris (Procellariiformes: Procellariidae), using DNA fingerprinting(CSIRO Publishing, 1993) Austin, J.; Carter, R.; Parkin, D.Genetic relationships between adults and nestlings of the short-failed shearwater, Puffinus tenuirostris, were analysed by multilocus DNA fingerprinting. Short-tailed shearwaters are socially monogamous, forming strong pair bonds, often for many years. The human polycore minisatellite probe, 33-6, revealed sufficient variation in shearwater DNA to allow individual-specific identification. A total of 22 nestlings and 32 adults, comprising 10 trios of nestling and both parents, and 12 pairs of nestling and only one parent, were examined. Analysis of fingerprint profiles revealed four cases where a nestling was not related to one of the attendant adults, and may have resulted from an extra-pair fertilisation. Extra-pair fertilisations, as an alternative breeding strategy, are discussed with respect to the biased and low reproductive output of this long-lived species.Item Metadata only Hatching success of the Short-tailed Shearwater (Puffinus tenuirostris) in two Tasmanian colonies(Australian Bird Study Association, 1994) Austin, J.; Edmunds, M.Considerable variation between colonies and yearsItem Metadata only Current research in active control of noise(Auburn University, 1994) Hansen, C.Item Metadata only Critical flow and blooms of the cyanobacterium Anabaena circinalis in the Murray River system(Australian Water and Wastewater Association, 1994) Burch, M.; Steffenson, D.; Bursill, D.; Bain, D.; Ganf, G.; Brookes, J.; Environmental Flows Seminar (25-26 August 1994 : Canberra, ACT)Item Metadata only Separation of forms of Microcystis from Anabaena in mixed populations by the application of pressure(CSIRO, 1994) Brookes, J.; Ganf, G.; Burch, M.Critical-pressure distributions of gas vesicles in Anabaena circinalis, Microcystis aeruginosa f. aeruginosa and M. a. f. flos-aquae were determined for suspensions both in hypertonic sucrose solutions and in reservoir water. The differences between the critical and apparent critical pressures of gas vesicles suggested that differential pressurization could be used to separate these taxa. Subsequent experiments successfully separated (>90%) the two formae of Microcystis by the application of 500 kPa and M. a. f. aeruginosa from A, circinalis by the application of 300 kPa. This technique has the potential to provide sufficiently pure material to distinguish the relative toxicity of the two formae of Microcystis in the presence of a neurotoxic A. circinalis.Item Metadata only Species composition related to spectral classification in an Australian spinifex hummock grassland(Taylor and Francis, 1994) Lewis, M.This paper demonstrates a methodology for relating objective vegetation classifications to spectral classifications in order to map variation in species composition within natural vegetation. Landsat MSS data was used to map spinifex-dominated vegetation units for an island conservation reserve and oil production field on the north-western shelf of Western Australia. A significant relationship was established between an agglomerative hierarchical classification of ground samples, characterized by percentage cover of plant species and physical cover components, and a similar classification of spectral means for sample pixels. Assignment of spectral means to mapping classes was guided by both ground and spectral sample clustering. The strong relationship between the spectral classification and vegetation groups meant that cover classes mapped on the basis of spectral properties could be characterized by quantitative ground data meaningful to vegetation ecology. The resultant groups were differentiated largely on the basis of percentage cover of the three major spinifex species and the proportion of plant litter and exposed soil and surface rock. The study confirms the utility of ground cover as a quantitative variable for developing relationships with spectral classifications, and demonstrates a methodology which may have a wider application for mapping natural vegetation communities.Item Metadata only Population genetic structure of a philopatric, colonial nesting seabird, the Short-tailed Shearwater (Puffinus tenuirostris)(American Ornithologists Union, 1994) Austin, J.; White, R.; Ovenden, J.Short-tailed Shearwaters (Puffinus tenuirostris) are a numerous, colonially nesting seabird that is strongly philopatric. We applied restriction-enzyme analysis of mitochondrial DNA (mtDNA) to 335 individuals from 11 colonies across southeastern Australia to assess population-genetic structure and the amount of genetic variability in this species. Eleven 6/5.33-base and four 4-base restriction enzymes revealed 25 and 48 mtDNA haplotypes in two overlapping surveys of 215 individuals from seven colonies and 231 individuals from eight colonies, respectively. A low mean sequence diversity among individuals (0.247%) and lack of spatial structuring of mtDNA haplotypes suggest a lack of population-genetic structure and a reduced ancestral population size during glaciation, followed by a population and range expansion. Intracolony mtDNA diversities in three recently established colonies and in one colony that has experienced a recent bottleneck were comparable to mtDNA diversities within larger and older colonies. This suggests that, despite strict philopatry in those colonies, colony founding and recovery from population reduction occurs via immigration of a large number of individuals.Item Metadata only Complexation of fluorinated amino acid derivatives by b- and g-cyclodextrin in aqueous solution. A 19F nuclear magnetic resonance study(CSIRO, 1995) Brown, S.; Easton, C.; Lincoln, S.Item Metadata only Nematodes as biocontrol agents of Helicid snails(Australasian Association of Nematologists, 1995) Charwat, S.; Davies, K.; Fraser, H.Item Metadata only Increased genetic diversity in mitochondrial genes is correlated with the evolution of parasitism in the Hymenoptera(Springer International, 1995) Dowton, M.; Austin, A.A higher AT content and rate of mtDNA sequence divergence was found in parasitic wasps (Apocrita) compared with nonparasitic wasps (Symphyta). The compositional bias was reflected in extreme codon bias for a cytochrome oxidase I protein coding gene fragment as well as in the types of amino acid substitutions that have occurred during the evolution of this gene fragment. In some instances, compositional bias influenced the definition of a conservative amino acid change. The increased rate of mtDNA sequence evolution probably arose during the early Jurassic, coincident with the first appearance of parasitic wasps in the fossil record. Our results suggest a causal link between the rate of sequence divergence and the parasitic lifestyle.Item Metadata only Complexes of fluorinated amino acid derivatives and hexakis (2,3,6-tri-O-methyl a-cyclodextrin) in aqueous solution. A 19F nuclear magnetic resonance study(Royal Society of Chemistry, 1995) Brown, S.; Easton, C.; Lincoln, S.Item Metadata only The quasi-stationary behavior of quasi-birth-and-death processes(Institute of Mathematical Statistics, 1995) Bean, N.; Bright, L.; Latouche, G.; Pearce, C.; Pollett, P.; Taylor, P.For evanescent Markov processes with a single transient communicating class, it is often of interest to examine the limiting probabilities that the process resides in the various transient states, conditional on absorption not having taken place. Such distributions are known as quasi-stationary (or limiting-conditional) distributions. In this paper we consider the determination of the quasi-stationary distribution of a general level-independent quasi-birth-and-death process (QBD). This distribution is shown to have a form analogous to the matrix-geometric form possessed by the stationary distribution of a positive recurrent QBD. We provide an algorithm for the explicit computation of the quasi-stationary distribution.Item Metadata only Reduction of radiated sound by use of actively controlled perforated panels(Elsevier, 1995) Burgemeister, K.; Hansen, C.Item Metadata only Stable coexistence of grandiderite and kornerupine during medium pressure granulite facies metamorphism(Mineralogical Society, 1995) Carson, C.; Hand, M.; Dirks, P.AbstractPetrological and mineral chemical data are presented for two new occurrences of co-existing borosilicate minerals in the Larsemann Hills, East Antarctica. The assemblages contain kornerupine and the rare borosilicate, grandidierite (Mg,Fe)A13BSiO9. Two distinct associations occur: (1) At McCarthy Point, 1–10 mm thick tourmaline-kornerupine-grandidierite layers are hosted within quartzofeldspathic gneiss; and (2) Seal Cove, where coexisting kornerupine and grandidierite occur within coarse-grained, metamorphic segregations with Mg-rich cores of cordierite-garnet-spinel-biotite-ilmenite and variably developed plagioclase halos. The segregations are hosted within biotite-bearing, plagio-feldspathic gneiss. Textural relationships from these localities indicate the stability of co-existing kornerupine and grandidierite.The grandidierite- and kornerupine-bearing segregations from Seal Cove largely postdate structures developed during a crustal thickening event (D2) which was coeval with peak metamorphism. At McCarthy Point, grandidierite, kornerupine and late-tourmaline growth predates, or is synchronous, with F3 fold structures developed during a extensive granulite grade, normal shearing event (D3) which occurred prior to, and synchronous with, near-isothermal decompression. Average pressure calculations on assemblages that coexist with the borosilicates at Seal Cove, indicate the prevailing conditions were 5.2–5.5 kbar at ∼ 750°C for formation of the grandidierite-kornerupine assemblage.