13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...

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Wallis Lake Estuary Management Plan E.5 Management Area A, B, C, D, E, F Management Objective Establish abundance and distribution data for aquatic vegetation within the estuary Action Action Indicative Priority Responsibilities Progress No Cost E.5.1 Continue with Posidonia australis surveys on a regular basis $5,000 + staff time Medium (B5) GLC First survey conducted in 2002 E.5.2 Continue the seagrass monitoring program, coordinated under the HLP In HLP Medium (B5) GLC Ongoing budget E.5.3 Record the timing, frequency, magnitude, location and species of phytoplankton Staff time High (A5) GLC and macro-algae blooms Comments Posidonia australis surveys conducted approximately biannually will allow a detailed assessment of any changes in the health and size of all Posidonia australis beds in the estuary. Whereas the SMP will provide information on any seasonal and long-term changes in health and density for a selection of seagrass beds containing Posidonia australis, Zostera spp, Ruppia sp and Halophila sp. Sporadic phytoplankton and macro-algae (eg Elodea, Eurasian Watermilfoil, Chaetomorpha sp) blooms that may occur after rainfall events or during Spring when water temperatures warm up are likely to be missed during aquatic vegetation surveys. Details on these blooms should be recorded so that any patterns in their occurrence or information on the causes of the blooms can be assessed. NSW DPI repeated the survey of West et al (1985) in 2004 to accurately determine the current distribution of aquatic habitats and identify and assess any long-term changes. This will help identify aquatic habitat areas under threat that require immediate management action. 46
Wallis Lake Estuary Management Plan [Figure 4.8: Location of sites for the seagrass monitoring program] 47
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13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...

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