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Assessing estuary pressures and the relationships with catchment conditions

Assessing estuary pressures and the relationships with catchment conditions. Michaela Dommisse, Multi-regional projects (#203029). Estuaries and human activities. Kidneys of the sea. 23. 9. 17. 41. 18. 123 bays, inlets and estuaries

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Assessing estuary pressures and the relationships with catchment conditions

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  1. Assessing estuary pressures and the relationships with catchment conditions Michaela Dommisse, Multi-regional projects (#203029)

  2. Estuaries and human activities Kidneys of the sea 23 9 17 41 18 123 bays, inlets and estuaries Lifestyle, freshwater, fertile land, fish catch and shipping

  3. Victoria in context of national landscape healthFuture population projection >10 people per km2 in catchments = muddy estuary (Edgar, 2001)

  4. Ranging from Values of estuaries short long intermittent mouth open mouth microtidal macrotidal open coast sheltered embayment 500 m 500 m Anglesea Cardinia

  5. The Project in a nutshell 1 2 4 3 5 Link whole of ecosystem pressure to state Make sure it happens Incorporate into management plans outcomes outputs

  6. Human activities and estuaries Catchment use Environmental flow Coastal development Harvest and use Mouth opening

  7. Steps for science outputs • Summarise information on estuary pressures in a GIS or tagged database - Barton PhD (31 estuaries, phyico/chem data) • Develop conceptual models linking pressures to estuary condition (building on SERM and Ozestuaries) • Validate methodology (in situ) • Develop Interim guidelines

  8. Cause-effect 1 • Spatial comparison across estuaries with different catchment characteristics, mouth opening/closing regimes etc. • broad-scale correlation • Barton PhD - EPA data • 31 estuaries ranging from degraded (e.g. Curdies) through “pristine” (e.g. St George, Tidal Rivers)

  9. Cause-effect 2 • Evaluate response of estuaries to specific management actions • environmental flow releases (e.g. Coorong and Murray flows) • nutrient management schemes (e.g. regularly monitoring algal blooms) • estuary mouths artificially opened or closed (e.g. non-management action in Surry)

  10. W E Em Microbial function- condition Highly nMDS Stress 0.14 Intermediate Minimally Low Diagram from Jan Barton (EPA, Flinders)

  11. Steps to make it happen • Consideration in broad strategies – regional catchments strategies (Advocacy group) • Incorporation into existing plans and strategies as science becomes available (agency participation) – regional river health strategies

  12. Time frames? Pressures summary Biophysical classification Indicators and conceptual models Final report Start Methods Sept 07 Aug 05 March 06 Dec 06 March 07 Dec 07 Sept 07 Nov05 Increase the profile of Victoria’s estuaries Nov 05 April 06 Feb 07 Dec 07 Housing the science www.dse.vic.gov.au

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