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Water Quality

Dr. Deniz Özkundakci

Post-doctoral Researcher

Deniz Özkundakci leads Intermediate Outcome 1 (IO1); Harmful Algal Bloom Management for Lake Biodiversity Restoration. This research will provide action to arrest the decline of lake biodiversity from harmful algal blooms (HABs) and eutrophication generally. It aims to understand critical aspects of the ecology of HABs in New Zealand, and use this knowledge to develop new tools and technologies for early detection and mitigation of HABs and to plan scenarios to address planning scenarios for future lake state. The key components of IO1 include genetic tools for identification of cyanobacteria (blue-green algae), model applications to address future land use and lake water quality scenarios, and examination of chemical treatments for nutrient inactivation.

Deniz’s research interests range from lake management and in-lake restoration methods to advanced chemical analytical techniques such as ³¹P Nuclear Magnetic Resonance for phosphorus speciation. Deniz also has a particular interest in lake ecosystem modelling for simulating eutrophication control.

Deniz has been with the OBI research program since 2005 and has been involved in collaborative work between the University of Waikato and NIWA, Environment Bay of Plenty, Environment Waikato, SCION, and AgResearch, Department of Conservation, and the University of Otago.

E-mail: denizo@waikato.ac.nz

Expand to see publications by Deniz Özkundakci

Publications

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Journal, book, and conference publications

Papers

Abell, J.M., Özkundakci, D., Hamilton, D.P., and Miller, S.D. 2011. Relationships between land use and nitrogen and phosphorus in New Zealand lakes. Marine and Freshwater Research 62: 162-175. Read abstract.

Özkundakci, D., Duggan, I.C. and Hamilton, D.P. 2011. Does sediment capping have post-application effects on zooplankton and phytoplankton? Hydrobiologia 661: 55-64. Read abstract.

Özkundakci, D., Hamilton, D.P. and Gibbs, M. 2011. Hypolimnetic phosphorus and nitrogen dynamics in a small, eutrophic lake with a seasonally anoxic hypolimnion. Hydrobiologia 661: 5-20. Read abstract.

Özkundakci, D., Hamilton, D. P. and D. Trolle, 2010. Modelling the response of a highly eutrophic lake to reductions in external and internal nutrient loading. New Zealand Journal of Marine and Freshwater Research, 45: 165-185. Read abstract.

Gibbs, M. M., Hickey, C. W. and D. Özkundakci, 2010. Sustainability assessment and comparison of efficacy of four P-inactivation agents for managing internal phosphorus loads in lakes: sediment incubations. Hydrobiologia, DOI 10.1007/s10750-010-0477-3. Read abstract.

Abell, J.M., Özkundakci, D. and D.P. Hamilton. 2010. Nitrogen and phosphorus limitation of phytoplankton growth in New Zealand lakes: Implications for eutrophication control. Ecosystems DOI: 10.1007/s10021-010-9367-9. Read abstract

Gibbs, M. and D. Özkundakci, 2010. Effects of a modified zeolite on P and N processes and fluxes across the lake sediment-water interface using core incubations, Hydrobiologia, DOI 10.1007/s10750-009-0071-8
Read abstract

Özkundakci, D., Hamilton, D. P. and P. Scholes, 2009. Effect of intensive catchment and in-lake restoration procedures on phosphorus concentrations in a eutrophic lake. Ecological Engineering, DOI: 10.1016/j.ecoleng.2009.11.006.
Read abstract

Reports

Özkundakci, D. and D. Hamilton, 2007. Recent studies of sediment capping and flocculation for nutrient stabilisation. CBER Contract Report No. 53. Report prepared as part of the Lake Ecosystem Restoration New Zealand (LERNZ). Centre for Biodiversity and Ecology Research, Department of Biological Sciences, School of Science and Engineering, The University of Waikato, Hamilton.

Gibbs, M., Dudli, S., Vopel, K., Hickey, C., Wilson, P., and D. Özkundakci, 2007. P-inactivation efficacy of Z2G1 as capping agent on Lake Okaro sediment. NIWA client report prepared for Environment Bay of Plenty, 33p.

Beaton, R., D. Hamilton, M. Brokbartold, C.Brakel and D. Özkundakci, 2007. Nutrient budget and water balance for Lake Ngaroto. CBER Contract Report No. 54. Centre for Biodiversity and Ecology Research, Department of Biological Sciences, School of Science and Engineering, The University of Waikato, Hamilton.

Paul, W., Özkundakci, D. and D. P. Hamilton, 2008. Modelling of restoration scenarios for Lake Ngaroto. CBER Contract Report No. 81 Centre for Biodiversity and Ecology Research, Department of Biological Sciences, School of Science and Engineering, The University of Waikato, Hamilton.

Gibbs, M., Bremner, D., van Kooten, M. and D. Özkundakci, 2008. Comparison of efficacy of four P-inactivation agents on Lake Rotorua sediments. NIWA client report prepared for Environment Bay of Plenty, 62p.

Oral presentations

Özkundakci, D, Abell, J.M. and D.P. Hamilton. Temporal variations in nitrogen and phosphorus concentrations in 11 volcanic lakes in New Zealand: The role of trophic state, lake morphology and catchment connectivity. Presentation at the 31st congress of the International Limnological Society, Cape Town, South Africa, 15-20 August 2010.

Özkundakci, D., Hamilton, D. The impact of sediment treatment on pore water chemistry in a eutrophic lake. Presentation at the joint conference of the New Zealand Freshwater Sciences Society and the Australian Society for Limnology. Queenstown, New Zealand, 3-7 December, 2007.

Özkundakci, D., Hamilton, D. The impact of sediment treatment on pore water chemistry in a eutrophic lake. Presentation at the 11th International Symposium on the Interactions Between Sediments and Water. Esperance, Australia, 17-22 February, 2008.

Özkundakci, D., Hamilton, D. Restoration of Lake Okaro. Presentation at the LERNZ information day. University of Waikato, Hamilton, New Zealand, 18 April, 2008.

Özkundakci, D. Restoration of Lake Okaro using modified zeolite. Seminar at Scion Research, Rotorua, 15 August 2008.

Özkundakci, D., Hamilton, D. and P. Scholes. Phosphorus reduction in the water column of a eutrophic lake in response to intensive catchment and in-lake restoration measures. Presentation at the New Zealand Freshwater Sciences Society annual conference, New Plymouth, New Zealand, 24-27 November 2008.

Özkundakci, D. and D. Hamilton. Locking up nutrients in lake sediments while the world is running short of phosphorus – a 31P NMR study. Presentation at the Annual science review meeting Lake Ecosystem Restoration New Zealand (LERNZ) and Invasive Animals Cooperative Research Centre (IA CRC) University of Waikato 23-25 June 2009.

Özkundakci, D., Hamilton, D. and D. Trolle. Modelling eutrophication control: the importance of phosphorus versus nitrogen reductions. Presentation at the joint conference of the New Zealand Hydrological and New Zealand Freshwater Sciences Society, Whangarei, New Zealand, 23-27 November, 2009.

Poster presentations

McBride, C.. Hamilton, D. P. and D. Özkundakci. Modelling lake response to land use change: Improving model accuracy using buoy data. Poster presentation Global Lake Ecological Observatory Network meeting, Torres, Brazil, May 2010.

Özkundakci, D., Hamilton, D., Langdon, A., Mathieson, G., and T. Stuthridge. Speciation and dynamics of phosphorus in relation to lake restoration methods. Poster presentation at the New Zealand Freshwater Sciences Society annual conference. Rotorua, New Zealand, 27-30 November, 2006.

Özkundakci, D. and D. Hamilton. Restoration of Lake Okaro. Poster presentation at the Lakes Water Quality Society Symposium, Nutrient Sensitive Zones, Heritage Hotel, Rotorua, 12-13 August 2008.

Gibbs, M., Bremmer, D., Hickey, C. and D. Özkundakci. Lake Remediation using sediment capping: the pros and cons. Poster presentation at the New Zealand Freshwater Sciences Society annual conference, New Plymouth, New Zealand, 24-27 November 2008.

Other publications

Özkundakci, D., McBride, C. and A. Taylor, 2008. Lake Okaro and its restoration. Soils 2008 Australian and New Zealand 4th joint soils conference 1-5 December 2008, p. 136-141, In: Lowe, D. (Ed.), Ashes and Issues, Guidebook for pre-conference North Island field trip 28-30 November 2008, 194 p.