2,109 research outputs found
Ichthyoplankton assemblages associated with pink snapper (Pagrus auratus) spawning aggregations in coastal embayments of southwestern Australia
No full textPink snapper (Pagrus auratus) form spawning aggregations during the austral spring/summer in three adjacent, sheltered, coastal embayments in southwestern Australia (Cockburn Sound, Warnbro Sound and Owen Anchorage). Larval fishes were sampled in these embayments, as well as in the more exposed adjacent waters of Five Fathom Bank, to ascertain which teleost species utilised these areas for spawning concurrently with P. auratus. Obliquely towed bongo nets (500 μm mesh) were used to collect icthyoplankton in November 2007 over three days during the new moon period when spawning of P. auratus is known to peak. A total of 13 270 larvae from 30 teleost families was collected with an overall mean larval fish concentration of 1.91 m -3 (± s.e. 0.28). Larval fish assemblages were significantly different in each of the three embayments and Five Fathom Bank, reflecting the degree of shelter, water-circulation patterns and associated benthic habitats. The highest larval fish concentrations were recorded in Cockburn Sound (3.69 m -3 ± s.e. 0.05) and the lowest along Five Fathom Bank (0.16 m -3 ± s.e. 0.02). P. auratus larvae were only present in samples from the three embayments. The most abundant larvae were those of the Australian anchovy (Engraulis australis), which occurred predominantly in Cockburn Sound and, to a lesser extent, Owen Anchorage. The most ubiquitous larvae included the longspine dragonet (Callionymus goodladi) and leatherjackets (Monacanthidae). This study provides circumstantial evidence that eggs and larvae of P. auratus and other teleosts are retained in the sheltered waters of Cockburn and Warnbro Sounds during spring/summer
Fish assemblages associated with natural and anthropogenically-modified habitats in a marine embayment: Comparison of baited videos and opera-house traps
No full textMarine embayments and estuaries play an important role in the ecology and life history of many fish species. Cockburn Sound is one of a relative paucity of marine embayments on the west coast of Australia. Its sheltered waters and close proximity to a capital city have resulted in anthropogenic intrusion and extensive seascape modification. This study aimed to compare the sampling efficiencies of baited videos and fish traps in determining the relative abundance and diversity of temperate demersal fish species associated with naturally occurring (seagrass, limestone outcrops and soft sediment) and modified (rockwall and dredge channel) habitats in Cockburn Sound. Baited videos sampled a greater range of species in higher total and mean abundances than fish traps. This larger amount of data collected by baited videos allowed for greater discrimination of fish assemblages between habitats. The markedly higher diversity and abundances of fish associated with seagrass and limestone outcrops, and the fact that these habitats are very limited within Cockburn Sound, suggests they play an important role in the fish ecology of this embayment. Fish assemblages associated with modified habitats comprised a subset of species in lower abundances when compared to natural habitats with similar physical characteristics. This suggests modified habitats may not have provided the necessary resource requirements (e.g. shelter and/or diet) for some species, resulting in alterations to the natural trophic structure and interspecific interactions. Baited videos provided a more efficient and non-extractive method for comparing fish assemblages and habitat associations of smaller bodied species and juveniles in a turbid environment
Erythrocyte complement receptor 1 (CR1) expression level is not associated with polymorphisms in the promoter or 3' untranslated regions of the CR1 gene
No full textComplement receptor 1 (CR1) expression level on erythrocytes is genetically determined and is associated with high (H) and low (L) expression alleles identified by a HindIII restriction fragment-length polymorphism (RFLP) in intron 27 of the CR1 gene. The L allele confers protection against severe malaria in Papua New Guinea, probably because erythrocytes with low CR1 expression, are less able to form pathogenic rosettes with Plasmodium falciparum-infected erythrocytes. Despite the biological importance of erythrocyte CR1, the genetic mutation controlling CR1 expression level remains unknown. We investigated the possibility that mutations in the upstream or 3' untranslated regions of the CR1 gene could control erythrocyte CR1 level. We identified several novel polymorphisms; however, the mutations did not segregate with erythrocyte CR1 expression level or the H and L alleles. Therefore, high and low erythrocyte CR1 levels cannot be explained by polymorphisms in transcriptional control elements in the upstream or 3' untranslated regions of the CR1 gene
A priori error estimates for numerical methods for scalar conservation laws. Part I: The general approach
No full textCockburn, Bernardo; Gremaud, Pierre-Alain. (1994). A priori error estimates for numerical methods for scalar conservation laws. Part I: The general approach. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/2658
Optimisation of Metallic FibreNetwork Materials for Compact Heat Exchangers
No full textThis paper describes an experimental and analytical study of conductive and convective heat transport in metallic fibre network materials. Thermal profiles were measured while gas flowed through such networks. The lateral heat flow rate was found to be proportional to the logarithm of the mean temperature difference between the inlet gas and the wall. Such behaviour is expected when transverse heat flow is a dominant process. An analytical model is developed to simulate the performance of compact heat exchangers based on fibre networks. A study is presented of the inter-relationships between heat transfer performance, fibre network properties, system dimensions and pump characteristics. Some guidelines are presented for controlling the architecture of such fibre network materials, so as to optimise their performance as heat exchangers
Cooperating Intelligent Systems for Electricity Distribution
No full textThis paper concentrates on the project's CIDIM (Cooperating Intelligent Systems for DIstribution Syste
Recovery of donor meadows of posidonia sinuosa and posidonia australis contributes to sustainable seagrass transplantation
No full textDonor meadow recovery is important in deciding whether removal of material from natural seagrass meadows is a sustainable activity. Thus an investigation into meadow regrowth was undertaken as part of a large-scale seagrass rehabilitation effort in Cockburn Sound, Western Australia. Several plug extraction configurations were examined in Posidonia sinuosa and Posidonia australis meadows to monitor shoot growth into plug scars. No significant differences in shoot growth between extraction configurations were observed, and both species increased their shoot numbers over two years, with P. sinuosa showing a significantly better recovery rate than P. australis. P. sinuosa shoot recovery into extracted areas was 2.2 0.1 shoots over 24 months, similar to shoot changes in controls (2.3 shoots over the same period). P. australis shoot recovery for each configuration was 0.8 0.3 shoots in 24 months compared with 1.5 shoots in the controls. Based on the number of regrowing shoots, the predicted recovery time of a meadow is estimated at 4 years for P. sinuosa and three years for P. australis. Different plug extraction configurations do not appear to affect meadow recovery, and it can be concluded that established meadows of both species are sustainable providers of planting units for rehabilitation measures
Catharine Trotter Cockburn against Theological Voluntarism
No full textCatharine Trotter Cockburn challenges voluntarist views held by British moral philosophers during the first half of the eighteenth century. After introducing her metaphysics of morality, namely, her account of human nature, and her account of moral motivation, which for her is a matter concerning the practice of morality, I analyze her arguments against theological voluntarism. I examine, first, how Cockburn rejects the view that God can by an arbitrary act of will change what is good or evil; second, how she challenges views that understand the initial creation of the world solely in terms of divine will and draws attention to the role that the divine understanding plays in God’s creation; and third, how she argues that moral obligation does not require a superior lawmaker. I conclude by highlighting how Cockburn’s arguments not only challenge voluntarist views, but also offer support for her moral fitness theory
Catharine Trotter Cockburn against Theological Voluntarism
No full textCatharine Trotter Cockburn challenges voluntarist views held by British moral philosophers during the first half of the eighteenth century. After introducing her metaphysics of morality, namely, her account of human nature, and her account of moral motivation, which for her is a matter concerning the practice of morality, I analyze her arguments against theological voluntarism. I examine, first, how Cockburn rejects the view that God can by an arbitrary act of will change what is good or evil; second, how she challenges views that understand the initial creation of the world solely in terms of divine will and draws attention to the role that the divine understanding plays in God’s creation; and third, how she argues that moral obligation does not require a superior lawmaker. I conclude by highlighting how Cockburn’s arguments not only challenge voluntarist views, but also offer support for her moral fitness theory
An essay upon the propitious and glorious reign of our gracious sovereign Anne, [electronic resource] : Queen of Great Britain, France and Ireland, Defender of the Faith. To which are subjoined the characters of several eminent ministers of state, and Renowned Generals and Officers of the Army; with a brief Account of the Lords Commissioners of the Admiralty, &c.
No full textDedication signed: Will. Cockburn.'Characters of several ministers of state' has a separate titlepage; pagination and register are continuous.Electronic reproduction.English Short Title Catalog,Reproduction of original from British Library
- …
