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The relationships between seagrasses and the processes at accretion and erosion at Towra Bay, Botany Bay.

Author:

D Leadbitter

Abstract

Towra Point is a low-lying promontory located near the mouth of the Georges River in the south-western sector of Botany Bay (Fig.1). It is connected to the Kurnell Peninsula by Towra Peninsula, much of which is bordered by extensive saltmarshes and mangrove stands. The north-eastern and north-western perimeters of Towra Point are bounded by narrow, sandy beaches. Behind Towra Beach lies a series of low-lying dunes (max. Elevation approx. 5 metres) orientated east-west and covered by sclerophyll forest. Subtidally, the beaches support extensive meadows of seagrasses, dominated by Posidonia australis and Zostera capricorni, to a depth of about 3 metres. The geology of the area is dominated by unconsolidated sands deposited after sea level reached its present level about 6,000 years B. P., following the Holocene Marine Transgression. These sediments are constantly being reworked by winds and waves although terrestrial and Subtidal vegetation moderate this process considerably.
How to Cite: Leadbitter, D., 2009. The relationships between seagrasses and the processes at accretion and erosion at Towra Bay, Botany Bay.. Wetlands Australia, 6(1), pp.33–37. DOI: http://doi.org/10.31646/wa.90
Published on 13 Oct 2009.
Peer Reviewed

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