Queensland branch meeting

TIME: 5:30 pm talk followed by Pizza at 6:30, Tuesday 20 November 2018
COST: Free
VENUE: Queensland University of Technology, Gardens Point, S Block, GP-S-314
TITLE: The multi-substance Potentially Affected Fraction as a measure of ecological risk to the Great Barrier Reef

SPEAKER: Catherine Neelamraju, Senior Scientist, Water Quality and Investigations, Department of Environment and Science, Queensland Government

The Reef 2050 Water Quality Improvement Plan (WQIP) 2017–2022 water quality targets are based on the need to improve the health and resilience of the Great Barrier Reef (GBR). The new pesticide target is risk-based and aims to protect at least 99% of aquatic species at the mouth of rivers from the adverse effects of all pesticides during the wet season. This target replaces the original load-based and the subsequent toxic-load based target previously used. The adoption of the new target is a fundamental change to the way that pesticides are assessed and reported, and represents a move to more ecologically-relevant reporting of pesticides for GBR catchments. In order to measure current catchment condition (risk) and progress toward meeting the pesticide target (improvement) it is necessary to be able to estimate the toxicity due to the presence of multiple pesticides in terms of percent species impacted. This is done using the multi-substance potentially affected fraction (ms-PAF) method that provides an estimate of the risk based on the fundamental theory of mixture toxicity and toxic mode of action (TMoA) of compounds in a mixture.

Catherine is an applied scientist with expertise in assessing interactions across landscapes and conducting water quality risk assessment to inform decision-support frameworks for environmental managers. She has worked in both research and monitoring of catchment water quality for the past 15 years, and has recently taken the position of Senior Scientist in the GBR Water Quality Investigations Team (DES). Catherine is currently developing a risk assessment metric for the impact of pesticide mixtures to the aquatic environment, as a move toward more ecologically relevant assessment of pesticide risk to the GBR Lagoon under the Reef 2050 Water Quality Improvement Plan.

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Queensland branch meeting
When: 20/11/2018
Time: 5:30 pm - 6:30 pm
Cost: Free

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