Mr Ryan Dunn

BEnvSc (Honours)

Contact details for Mr Ryan Dunn ryan.dunn@griffith.edu.au

Thesis
Biogeochemical processes with Coombabah Lake and surrounding intertidal sediments (southern Moreton Bay, Australia)
Description
My research focuses on surface sediment biogeochemical processes within the shallow semi-urbanised sub-tropical Coombabah Lake system and regional sandier sediments of southern Moreton Bay. The principal objectives of my research include the investigation into the source and distribution of organic matter, and the seasonal variation of solute fluxes and nutrient cycling within Coombabah Lake sediments. Furthermore the research aims to investigate the effects of different burrowing macrofaunal groups on surface sediment biogeochemistry in muddy and mangrove detritus enriched sandy sediments.
Supervisors
A/Prof Charles Lemckert
Dr David Welsh
Dr Peter Teasdale

Research expertise

  • Estuarine physicochemical parameter dynamics
  • Sediment biogeochemistry
  • In situ sampling techniques within coastal waters and sediments

Current teaching areas

  • Pollution chemistry
  • Environmental chemistry
  • Earth Sciences
  • Urban Infrastructure and Pollution

Publications

  • Research articles in peer reviewed journals

  • Dunn, R.J.K., Welsh, D.T., Lee, S.Y., Lemckert, C.J., Teasdale, P.R., Meziane, T., 2008. Investigating the distribution and sources of organic matter in surface sediment of Coombabah Lake (Australia) using elemental, isotopic and fatty acid biomarkers. Continental Shelf Research doi:10.1016/j.csr.2008.04.009
  • Knight, J.M., Dale, P.E.R., Dunn, R.J.K., Broadbent, G.J., Lemckert, C.J., 2008. Patterns of tidal flushing within a mangrove forest: Lake Coombabah, South East Queensland Australia. Estuarine, Coastal and Shelf Science 76, 580-593.
  • Dunn, R.J.K., Ali, A., Lemckert, C.J., Teasdale, P.R., Welsh, D.T., 2007. Short-term variability of physico-chemical parameters and the estimated transport of filterable nutrients and chlorophyll-a in the urbanised Coombabah Lake and Coombabah Creek system, southern Moreton Bay, Australia. Journal of Coastal Research 50 SI, 1062-1068.
  • Dunn, R.J.K., Lemckert, C.J., Teasdale, P.R. and Welsh, D.T., 2007. Distribution of nutrients in surface and sub-surface sediments of Coombabah Lake, southern Moreton Bay (Australia). Marine Pollution Bulletin 54, 606-614.
  • Dunn, R.J.K., Teasdale, P.R., Warnken, J., Jordan, M., Arthur, M. 2007. Evaluation of the time-integrated, in situ DGT technique by monitoring changes in heavy metal concentrations in estuarine waters in response to natural and anthropogenic processes. Environmental Pollution 148, 213-220.
  • Lee, S.Y., Dunn, R.J.K., Young, R.A., Connolly, R.M., .Dale, P.E.R., Dehayr, R., Lemckert, C.J., McKinnon, S., Powell, B., Teasdale, P.R., Welsh, D.T. 2006. Impact of urbanization on coastal wetland structure and function. Austral Ecology 31, 149-163.
  • Warnken, J., Dunn, R.J.K., Teasdale, P.R. 2004. Investigation of recreational boats as a source of copper at anchorage sites using time-integrated diffusive gradients in thin film and sediment measurements. Marine Pollution Bulletin 49, 833-843.
  • Dunn, R.J.K., Teasdale, P.R., Warnken, J., Schleich, R.R. 2003. Evaluation of the diffusive gradient in a thin film technique for monitoring trace metal concentrations in estuarine waters, Environmental Science and Technology 37, 2794-2800.

  • Technical reports

  • Warnken, J., Teasdale, P., Dunn, R., 2007. Ship sources pollutants from small to medium recreational and tourist vessels: Stage 3 Heavy metal concentrations. Technical Report CRC for Sustainable Tourism Pty Ltd.
  • Teasdale, P.R., Jordan, M.A., Dunn, R.J.K., Welsh, D., 2006. Assessment of Sediment Chemistry and Relationships with Intertidal Wetland Habitats in Gladstone, Queensland. Chapter 3 in: Connolly, R.M., Currie, D.R., Danaher, K.F., Dunning, M., Melzer, A., Platten, J.R., Shearer, D., Stratford, P.J., Teasdale, P.R. and Vandergragt, M. 2006. Intertidal wetlands of Port Curtis: ecological patterns and processes, and their implications. Technical Report No. 43, CRC for Coastal Zone, Estuary and Waterway Management, Brisbane.
  • Powell, B., Dunn, R.J.K., Welsh, D.T., Teasdale, P.R., 2006. Characterisation of the physical, chemical and biological composition of Coombabah Lake sediments. Chapter 2 in: Lee, S.Y., Connolly, R.M., Dale, P.E.R., Dunn, R.J.K., Knight, J.M., Lemckert, C.J., McKinnon, S., Powell, B., Welsh, D.T., Young, R. 2006. Impact of Urbanisation on Coastal Wetlands: A Case Study of Coombabah Lake, Southeast Queensland. Technical Report No. 54, CRC for Coastal Zone, Estuary and Waterway Management, Brisbane.
  • Lemckert, C.J., Dunn, R.J.K., Ali, A., 2006. Components of Sediment Transport: Lake Coombabah, South East Queensland Australia. Chapter 3 in: Lee, S.Y., et al. 2006. Impact of Urbanisation on Coastal Wetlands: A Case Study of Coombabah Lake, Southeast Queensland. Technical Report No. 54, CRC for Coastal Zone, Estuary and Waterway Management, Brisbane.
  • Knight, J.M., Dale, P.E.R., Dunn, R.J.K., Lemckert, C.J., 2006. Patterns of tidal flushing within a mangrove forest: Lake Coombabah, South East Queensland Australia. Chapter 4 in: Lee, S.Y., et al. 2006. Impact of Urbanisation on Coastal Wetlands: A Case Study of Coombabah Lake, Southeast Queensland. Technical Report No. 54, CRC for Coastal Zone, Estuary and Waterway Management, Brisbane.

Conference works

  • Dunn, R.J.K., Welsh, D.T., Jordan, M.A., Teasdale, P.R., 2007.Influence of the marine yabby (Trypaea australiensis) and organic matter on benthic metabolism, sediment-water column nutrient exchanges and nitrogen cycling: Insights from long-term mesocosm experiments. Griffith School of Engineering Research Conference, 2007 (G-SERC), Brisbane, Australia. Full written non-referred research article and Oral presentation.
  • Dunn, R.J.K., Jordan, M.A., Welsh, D.T., Teasdale, P.R., Lemckert, C.J., 2007. Seasonal variation in benthic metabolism, nutrient fluxes, denitrification and DNRA in an urbanised sub-tropical estuarine lagoon, Coombabah Lake (Australia). Symposium on Microbial Ecology (SAME10), Faro, Portugal. Oral presentation.
  • Dunn, R.J.K., Welsh, D.T., Jordan, M.A., Teasdale, P.R., 2007. Influence of the marine yabby (Trypaea australiensis) and organic matter on benthic metabolism, sediment-water column nutrient exchanges and nitrogen cycling: Insights from long-term mesocosm experiments. Symposium on Microbial Ecology (SAME10), Faro, Portugal. Poster presentation.
  • Dunn, R.J.K., Ali, A., Lemckert, C.J., Teasdale, P.R., Welsh, D.T., 2007. Short-term variability of physico-chemical parameters and the estimated transport of filterable nutrients and chlorophyll-a in the urbanised Coombabah Lake and Coombabah Creek system, southern Moreton Bay, Australia. International Coastal Symposium 2007 (ICS2007), Gold Coast, Australia. Poster presentation.
  • Dunn, R.J.K., Miurhead, S., Williamsky, M., van Ryn, V., Teasdale, P.R., Lee, S.Y., 2004. Measuring sulphide concentrations in sediments using the Diffusive Gradients in Thin Film (DGT) Technique. Royal Australian Chemistry Institute, Interact Conference (RACI 2004), Gold Coast, Australia. Poster presentation.
  • Dunn, R.J.K., Teasdale, P.R., Schleich, R.R., Warnken, J. 2002. Comparison of DGT (Diffusive Gradient in Thin Film) measurements of trace metal concentrations in the Gold Coast Broadwater with conventional techniques. Royal Australian Chemistry Institute, Interact Conference (RACI 2002), Sydney, Australia. Poster presentation.

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