Abstract
Princess Royal Harbour (PRH) and Oyster Harbour (OH) are adjacent embayments on the south coast of Western Australia. Both harbours have received similar long-term nutrient loadings although the sources are different; inputs into PRH are primarily from industry, agriculture and community whereas most nutrients enter OH via agricultural runoff in river discharge. In both harbours prolific growth of algae has resulted in widespread dieback of seagrass meadows as a result of shading and smothering. PRH contains about ten times the macroalgal biomass of OH and biological, chemical and photic factors do not appear to completely explain this anomaly. A comparison of physical measurements of the density structure in PRH and OH suggests that the contrasting hydrodynamic characteristics of these systems play dominant roles in controlling their ecological status.
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