Land, Sea and People in the New Millennium.
The present study was undertaken to investigate the observation that dolorite and shale shores in the Transkei tended to have less algal cover and to support more grazers than sandstone shores. The structure of rocky intertidal communities is determined by the interaction of a number of biotic and abiotic factors. The chemical and physical nature of the substratum has been shown to have an influence on colonization, but few studies have attempted to quantify experimentally the differences in succession observed on different substrata. Rock tiles (10 x 10 cm) cut from shale, dolorite and sandstone were placed on three shores, each dominated by one of the rock types, and monitored photographically for 18 months. Within each type two treatments consisting of smooth and rugose surfaces were applied to assess the influence of rugosity on colonization. Experiments were intitiated in summer and in winter to assess the influence of season on the colonization process. The rate of heating when e.....
Citation10th Southern African Marine Science Symposium
- Miscellaneous