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Bioindicators used to detect prawn farm and sewage effluent

Marine Botany The University of Queensland. Bioindicators used to detect prawn farm and sewage effluent. Adrian Jones, James Udy, Mark O’Donohue & William Dennison Department of Botany, The University of Queensland, Brisbane, Queensland, Australia. Acknowledgements.

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Bioindicators used to detect prawn farm and sewage effluent

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  1. Marine Botany The University of Queensland Bioindicators used to detect prawn farm and sewage effluent Adrian Jones, James Udy, Mark O’Donohue & William Dennison Department of Botany, The University of Queensland, Brisbane, Queensland, Australia

  2. Acknowledgements • Brisbane River and Moreton Bay Wastewater Management Study (Task - DIBM) • Ian McLeod & Tom Taranto - CSIRO Marine Research

  3. Aims • Develop bioindicators to identify different biotic responses for prawn farm effluent versus sewage effluent • Use bioindicator responses to determine the extent of prawn farm and sewage impacts

  4. Experimental Design • Develop bioindicators by comparing two separate tidal creeks:- prawn effluent discharge only - sewage discharge only • Use the identified responses in the bioindicators to detect sewage and prawn effluent discharging into the same water body

  5. Water Quality Comparison

  6. Impacted Unimpacted Study Sites - Two Creeks Moreton Bay Brisbane Logan R Prawn Farm STP

  7. 10-20 5-10 1-2 Water Column Nutrients NH4+ (µM) NO3-/NO2- (µM) PO43- (µM) Moreton Bay Brisbane Logan R Prawn Farm 130 STP

  8. 10-20 5-10 1-2 Chlorophyll a (µg l-1) Moreton Bay Brisbane Logan R Prawn Farm STP

  9. 50-100 20-50 1-20 Phytoplankton Productivity (mg C m-3 h-1) Moreton Bay Brisbane Logan R Prawn Farm STP

  10. 2-3 1.5-2.0 1-1.5 Tissue %N - Seagrass 2.0 Moreton Bay Brisbane 2.4 2.0 Logan R 2.8 Prawn Farm 2.0 2.8 1.7 STP

  11. Amino Acid Profile - Seagrass Glutamine + Asparagine (nmol g-1 wet wt) 17 Moreton Bay Brisbane 60 18 Logan R 22 Prawn Farm 19 20 10 STP

  12. Moreton Bay Brisbane Logan R Prawn Farm STP d15N - Seagrass 5.0 7.1 5.6 6.8 8.0 7.8 4.7

  13. Study Area

  14. Study Sites

  15. Sewage Effluent

  16. Prawn Farm Plume

  17. Prawn Farm Plume

  18. Water Quality Comparison

  19. Water Column Nutrients

  20. Chlorophyll a Map

  21. Amino Acid Profile - Mangroves Glutamine + Asparagine (nmol g-1 wet wt)

  22. Macroalgal d15N Map

  23. Conclusions • Sewage effluent • higher in dissolved nutrients • proportionally more NO3- and PO43- • Prawn effluent • predominantly NH4+ • higher in chlorophyll a and total suspended solids • Bioindicators were responsive to nutrients from both prawn and sewage effluent. • Bioindicator parameters identified a greater geographical influence than traditional water quality • Location of discharge may be important in controlling the impacts

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