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Title: Tan Teck Guan Medal Presentation to Sasi Nayar & Talk on Seagrass Death in Adelaide
Date: Mon 9 July 2007
Time: 7.00pm to 8.30pm
Location: Gardens Briefing Room @ the Botanic Gardens Visitor Centre (next to Nature's Niche)
This Event is Open to the Public

The Tan Teck Guan Medal will be presented to Sasi Nayar for his 2003 doctoral thesis on Nutrient and Biotic Fluxes in Relation to Dispersal of Pollutants in Ponggol River. Sasi Nayar will then speak on his current research in Adelaide with the South Australian Research and Development Institute:

What killed the seagrasses off the Adelaide coast in Southern Australia?
Since the 1940s, over 5000 ha of nearshore meadow forming seagrasses, Amphibolis and Posidonia, have been lost from the Adelaide metropolitan coastline in Southern Australia.

The loss of these seagrasses is of major concern due to their importance to near-shore productivity, seabed stability, and biodiversity. Engineering works and urbanisation during the 20th century substantially increased coastal inputs via rivers, stormwater drains, and wastewater treatment plant (WWTP) outfalls. Due to various coastal inputs, the metropolitan coast is no longer pristine, with elevated levels of nutrients, toxicants, and turbidity being detected and reported regularly over the last 30 years. Each of these potential stressors has been implicated in the historical loss of seagrasses. This talk will specifically address the effect of nutrients on seagrass assessed from in situ chamber incubations, field experiments and mesocosm trials.

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