Chartrand, K.M., and Rasheed, M.A. (2010) Developing a model for tropical seagrass light requirements in a turbid port environment. In: [Presented at the World Seagrass Conference & 9th International Seagrass Biology Workshop]. p. 64. From: World Seagrass Conference & 9th International Seagrass Biology Workshop, 20-25 November 2010, Phuket & Trang, Thailand.

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Abstract

In Australian coastal waters and embayments, tropical seagrasses are often subject to dynamic light environments as naturally turbid waters and large tidal flux create periods of extreme high and low light over relatively short time scales (i.e. hours). Large port developments in these areas have the potential to confound the complex relationships between seagrass physiology and the light field with the onset of dredging and their associated plumes. Understanding the capacity for seagrasses to respond to changes in the quantity and quality of the light environment will allow for prediction of how seagrass species and populations will tolerate changes in light attenuation as may occur during large scale dredging. We present a strategy for determining whole plant light requirements for an intertidal tropical seagrass community in a port environment. Locally relevant light requirements are established by describing the relationships among photosynthetic inputs and losses, tidal exposure, shifts in spectral quality of light, seasonality and the capacity to utilise below ground carbon reserves. The outcomes of the model may provide definitive guidelines for a mitigation strategy that is focussed on maintaining critical windows of light to support seagrass growth and longer term survival in such turbid environments.

Item ID:	80253
Item Type:	Conference Item (Abstract / Summary)
Keywords:	seagrass, light requirements, dredging, management, Great Barrier Reef
Date Deposited:	04 Sep 2023 23:46
FoR Codes:	41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410402 Environmental assessment and monitoring @ 30% 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410404 Environmental management @ 70%
SEO Codes:	18 ENVIRONMENTAL MANAGEMENT > 1805 Marine systems and management > 180501 Assessment and management of benthic marine ecosystems @ 100%
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