Abstract
Summary The most recent trends in the economic development of Saldanha Bay are towards the tourist and mariculture industries, both of which are dependent on a high quality of water. Yet this water quality is now under threat. In this study, the extent of human induced changes to the characteristics of the water body are assessed in terms of their effects on the macrobenthic communities of the bay. Such effects are evaluated on the basis of changes in biomass, community structure and species composition using data from recent surveys as well as a limited quantity of historical data. Whilst gross effects are essentially confined to an area adjacent to the major fish factory outfall, the data do suggest a broader impact. There are substantial differences between the communities of ‘Big Bay’ and ‘Small Bay’, with an apparent increase in deposit feeding species and decline in suspension feeders in the latter. These changes are attributed to the organic loading from the fish factories and mariculture industrie...
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