Seagrass, sediment and infauna - a comparison of Posidonia australis, Posidonia sinuosa and Amphibolis antarctica, Princess Royal Harbour, South-Western Australia I. Seagrass biomass, productivity and contribution to sediments

The above- and below-ground biomass of three seagrass species, Posidonia australis, Posidonia sinuosa and Amphibolis antarctica, were measured within Princess Royal Harbour. Three sites were used of varying water movement and eutrophication. Sediment samples (to measure grain size and composition) were taken from below seagasses and from adjacent non-vegetated areas for comparsion and productivity measurements were carried out in situ.