In Southeast Asia, a Vulnerable seagrass species (H. beccarii) as
well as several species of Least Concern are in decline as a
result of aquaculture (Fig. 2b), artisanal fisheries and heavy
watershed siltation. In southern Australia, P. sinuosa (Vulnerable)with a high proportion of species in decline, need priority regional
conservation, even when globally the species are not in threatened
categories