ORCID Profile
0000-0003-2238-1740
Current Organisation
University of Adelaide
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Publisher: Springer Science and Business Media LLC
Date: 14-01-2014
Publisher: IEEE
Date: 07-2013
Publisher: Wiley
Date: 09-08-2016
DOI: 10.1002/MBO3.392
Abstract: Viral communities are important for ecosystem function as they are involved in critical biogeochemical cycles and controlling host abundance. This study investigates riverine viral communities around a small rural town that influences local water inputs. Myoviridae, Siphoviridae, Phycodnaviridae, Mimiviridae, Herpesviridae, and Podoviridae were the most abundant families. Viral species upstream and downstream of the town were similar, with Synechoccocus phage , salinus , Prochlorococcus phage , Mimivirus A, and Human herpes 6A virus most abundant, contributing to 4.9–38.2% of average abundance within the metagenomic profiles, with Synechococcus and Prochlorococcus present in metagenomes as the expected hosts for the phage. Overall, the majority of abundant viral species were or were most similar to those of marine origin. At over 60 km to the river mouth, the presence of marine communities provides some support for the Baas‐Becking hypothesis “ everything is everywhere , but, the environment selects .” We conclude marine microbial species may occur more frequently in freshwater systems than previously assumed, and hence may play important roles in some freshwater ecosystems within tens to a hundred kilometers from the sea.
Publisher: CSIRO Publishing
Date: 1990
DOI: 10.1071/MF9900581
Abstract: Apparent and inherent optical properties were determined for a range of water types in the Murray- Darling basin by using a combination of field and laboratory techniques. The absorption coefficient was calculated directly from in situ irradiance measurements of photosynthetically active radiation, whereas the scattering coefficient was determined from the irradiance measurements in conjunction with published nomograms relating the apparent and inherent optical properties. The validity of the nomograms for use in these waters was confirmed by comparing values of the average cosine calculated directly from in situ measurements with those estimated from the nomograms. These were closely correlated except for sites with chlorophyll concentrations greater than 200 mg m-3. The scattering coefficients estimated from the nomograms were approximately numerically equal to the turbidity in nephelometric turbidity units, but the variability of the relationship made it unsuitable for checking the validity of the nomograms. The relative role of dissolved and particulate components in the absorption and scattering of irradiance was examined by using spectrophotometry and linear regression of inherent optical properties on concentrations of the components. Estimates of specific absorption and scattering coefficients for algae, non-chlorophyllous suspended particles, and dissolved yellow colour were comparable to similar coefficients reported in the literature. The relative importance of these components to absorption and scattering varied considerably between sites and demonstrated the need for information on inherent optical properties in understanding the factors causing changes in optical water quality.
Publisher: Springer Science and Business Media LLC
Date: 04-05-2011
Publisher: Wiley
Date: 04-1994
Publisher: Wiley
Date: 04-09-2010
DOI: 10.1002/RRA.1309
Publisher: Informa UK Limited
Date: 05-2003
Publisher: Wiley
Date: 2010
Publisher: Oxford University Press (OUP)
Date: 1988
Publisher: Wiley
Date: 11-12-2003
Publisher: Springer Netherlands
Date: 2012
Publisher: Informa UK Limited
Date: 09-1987
Publisher: CSIRO Publishing
Date: 2009
DOI: 10.1071/MF08188
Abstract: Freshwater ecosystems are a foundation of our social, cultural, spiritual and economic well being. The degraded condition of many of Australia’s river ecosystems is testament to our failure to manage these resources wisely. Ecosystem science involves the holistic study of complex biophysical systems to understand the drivers that influence ecological pattern and process. Ecosystem science should underpin both water management and policy. Our understanding of aquatic ecosystems lags behind the increasing problems caused by past land and water management. Current post-graduate training programmes will not provide the aquatic ecosystem scientists needed by government and management agencies to prevent further degradation. We advocate new initiatives to capture the skills, knowledge and innovation of our research community by engaging scientists and managers in large-scale, long-term ecosystem science programmes across Australia and to integrate these programmes with community aspirations, policy, planning and management. We call on management agencies to increase their support for and uptake and use of ecosystem science. We also advocate establishment of national archives for long-term ecologically-relevant data and s les, and clear custodial arrangements to protect, update and facilitate knowledge-transfer. These initiatives need to be supported by more extensive, better-funded post-graduate and post-doctoral programmes in ecosystem science and management.
Publisher: Elsevier BV
Date: 11-2003
Publisher: Oxford University Press (OUP)
Date: 09-2003
Publisher: Springer Science and Business Media LLC
Date: 1999
Publisher: CSIRO Publishing
Date: 2004
DOI: 10.1071/MF03133
Abstract: An optical fibre technique for measuring the absorption of water-borne pigment in the present of significant suspended sediment concentration has been evaluated. Based on the absorption of the evanescent field of light propagating down a single glass (silica) fibre, the fibre evanescent field absorption (FEFA) technique has been demonstrated to be approximately 10-fold less sensitive to absorbing species than traditional bulk absorption methods. However, unlike traditional optical absorption measurements, the FEFA technique is insensitive to scattering by the suspended particles for particle concentrations expected in typical inland waters. A simple calculation estimates that this insensitivity persists for sediment concentrations up to 2000-fold those expected in Australian inland rivers. In addition to experimental results, a discussion of the potential operational use of this technique in measuring optical absorption properties of water containing suspended sediment is presented.
Publisher: Wiley
Date: 16-08-2013
DOI: 10.1111/FWB.12219
Publisher: Wiley
Date: 15-06-2023
DOI: 10.1002/RRA.1033
Publisher: Oxford University Press (OUP)
Date: 16-05-2013
Publisher: Public Library of Science (PLoS)
Date: 19-01-2016
Publisher: Inter-Research Science Center
Date: 12-08-2016
DOI: 10.3354/AME01788
Publisher: Informa UK Limited
Date: 09-1987
Publisher: Wiley
Date: 22-05-2006
Publisher: Informa UK Limited
Date: 09-1987
Location: Australia
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Roderick Oliver.