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Summary
The ecological segregation of nerites was examined both horizontally and vertically. Two groups of species were found Nenta undata and N. chamaeleon inhabit the rocky shores of the Exmouth Gulf side of North-West Cape where the water has a high silt content. Nerita plicata and N. albicilia live on the Indian Ocean side of the Cape where water turbidity is low.The temperate species N. atramentosa extends as far north as the southern end of North-West Cape, where it occurs sympatrically with N. plicata and N. aibicilla. In each group of species one lives high on the shore (N. undata or N. plicata) and one is lower (N. chamaeleon or N albicilial, Where N. atramentosa occurs it occupies an area slightly above N albicilla and below N. plicata. These findings are compared with the results of other studies on the patterns of ecological segregation in nerites.