Professor Bradley D Eyre BSc(Hons)(Adel) PhD(QUT) Research Interests: Estuarine and Coastal Biogeochemistry My initial work used simple mixing models, including the development of modified mixing models, to improve our understanding of the way nutrients are cycled in tropical and sub-tropical systems. The role of physical forcing events (i.e. floods) was emphasised in this early work (see Eyre, 2000). I then began focusing, in conjunction with my colleague Angus Ferguson, on the benthic metabolism of tropical and sub-tropical estuarine and coastal ecosystems. In particular, benthic carbon production and remineralisation and its link to nitrogen cycling processes such as benthic fluxes of inorganic and organic nitrogen, denitrification and N-fixation, and also the flow of carbon and nitrogen through lower food webs. I use a modified Membrane Inlet Mass Spectrometer (see Eyre et al., 2002) that allows us to measure direct 28N2 gas fluxes as well as 29N2 and 30N2 production following 15N additions allowing us to get simultaneous measurements of denitrification, N-fixation and net 28N2 gas fluxes. I received the 1999 Cronin Award by the Estuarine Research Federation (ERF) for my work on estuarine biogeochemistry. Whole Ecosystem Scale C. N and P Budgets I always had an interest in mass balance budgets as I see them as a way of constraining what we know, and what we do not know, about whole ecosystem scale flows of carbon, nitrogen and phosphorus. Budgets also provide a means of quantitatively comparing different coastal ecosystems. However, rarely do we have sufficient data sets available to construct these type of budgets (see Eyre and Mckee, 2002). Much of my estuarine coastal biogeochemical work is being undertaken in the context of providing information to fill data gaps in sub-tropical and tropical C, N and P budgets. And I will always go back to the budget framework when I have sufficient data sets. I have also been involved in LOICZ C, N, and P budgeting exercise having developed a number of budgets for Australian systems. Comparison of Tropical and Temperate Systems A common theme through much of my work is the comparison of tropical and temperate systems. I am interested in identifying the factors that modify the response of estuarine and coastal ecosystems from different climate zone to nutrient over-enrichment, in particular the role of benthic-pelagic coupling.
Applying cavity ring-down spectroscopy for the measurement of dissolved nitrous oxide concentrations and bulk nitrogen isotopic composition in aquatic systems: Correcting for interferences and field application (with Dirk V. Erler, T M. Duncan, R Murray, Damien T. Maher, Isaac R. Santos, J R. Gartland, and P Mangion), Limnology and Oceanography (2015)
Laser spectroscopy is an emerging technology for measuring nitrous oxide (N2O) dynamics in the environment,...
Drivers of carbon isotopic fractionation in a coral reef lagoon: predominance of demand over supply (with Matheus Carvalho de Carvalho, Isaac R. Santos, Damien T. Maher, T Cyronak, A McMahon, and K G. Schultz), Geochimica et Cosmochimica Acta (2015)
The carbon isotopic signature (δ13C) of coral skeletons is influenced by isotopic fractionation (εorg) during...
Examining 239+240Pu, 210Pb and historical events to determine carbon, nitrogen and phosphorus burial in mangrove sediments of Moreton Bay, Australia (with Christian J. Sanders, Isaac R. Santos, Damien T. Maher, Joshua L. Breithaupt, Joseph M. Smoak, Michael Ketterer, and Luciana Sanders), Journal of Environmental Radioactivity (2015)
Two sediment cores were collected in a mangrove forest to construct geochronologies for the previous...
High CO2 evasion during floods in an Australian subtropical estuary downstream from a modified acidic floodplain wetland (with Sergio Ruiz-Halpern, Damien T. Maher, and Isaac R. Santos), Limnology and Oceanography (2015)
Dissolved CO2 dynamics associated with flooding and postflood recovery were investigated in the lower estuary...
Spatial and temporal variability of carbon dioxide and methane fluxes over semi-diurnal and spring–neap–spring timescales in a mangrove creek (with Mitchell Call, Damien T. Maher, Isaac R. Santos, S Ruiz-Halpern, Perrine Mangion, Christian J. Sanders, Dirk V. Erler, Joanne M. Oakes, and R Rosentreter), Geochimica et Cosmochimica Acta (2015)
Automated in situ instrumentation captured high-resolution surface water pCO2, CH4 and 222Rn data at the...
Structure and function of warm temperate east Australian coastal lagoons: implications for natural and anthropogenic changes (with Damien T. Maher), Coastal lagoons: critical habitats of environmental change (2010)
Sediment biogeochemical indicators for defining sustainable nutrient loads to coastal ecosystems (with Angus JP Ferguson), Proceedings & presentations [electronic resource] / Coast to coast 2002, Australia's National Coastal Conference (2002)
Receiving waters ecological health monitoring program for the Skennars Head wastewater treatment plant (with Joanne Margaret Oakes), Centre for Coastal Biogeochemistry Report No. 2010-01 (2010)
Potential for ecological health impacts of discharges from Skennars Head Wastewater Treatment Plant (with Joanne Margaret Oakes), Centre for Coastal Biogeochemistry Report No. 2009-02 (2009)
Causes of deoxygenation in the Richmond River estuary, Final report to Environmental Trust (2001/RD/60005) (with Geoffrey Kerr and Leigh A. Sullivan), School of Environmental Science and Management Papers (2005)
Evaluation of the impact of nitrogen and phosphorous loads from the Alstonville, Wardell and Ballina sewage treatment plants on water quality in Richmond River catchment and estuary (with Peter R. Pepperell), School of Environmental Science and Management Papers (2001)