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. 

Journal articles

Link

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,...

 

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Behaviour of estrogenic endocrine-disrupting chemicals in permeable carbonate sands (with Benjamin O. Shepherd, Dirk V. Erler, Douglas R. Tait, Lukas van Zwieten, and Stephen Kimber), Environmental Science and Pollution Research (2015)

The remediation of four estrogenic endocrine-disrupting compounds (EDCs), estrone (E1), estradiol (E2), ethinylestradiol (EE2) and...

 

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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...

 

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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...

 

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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...

 

Book chapters

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)
 

Conferences

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)
 

Reports

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)
 

Nitrogen and phosphorous budgets for Tuggerah Lakes, Australia (with Peter R. Pepperell), School of Environmental Science and Management Papers (2001)