IN THE SOUTH-WEST INDIAN OCEAN* SUMMARYWaters of the southern African east coast are characterized by the Agulhas Current and related circulatory systems, a narrow continental shelf, the entry of many rivers into the sea and pronounced longshore sediment transport. An attempt is made to elucidate the response of marine life and in particular planktonic organisms, spiny lobsters, marine turtles, sharks, and estuarine and marine teleost fishes to this environmental regime. OPSOMMINGDie waters van die suidelike ooskus van Afrika word gekenmerk deur die Agulhasstroom en verwante patrone van watersirkulasie, 'n smal vastelandsplat, die invloei van ' n groot getal riviere en grootskaalse sedimentvervoer parallel met die kus. In hierdie referaat word gepoog om die reaksie van mariene organismes, veral plankton, krewe, seeskilpaaie, haaie, en estuariene-en mariene teleost visse tot hierdie omgewingsregime uiteen te sit.

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During a week in February, 1968, a series of detailed BT transects of the frontal zone and out to 100 miles seawards demonstrated the location of the surface front between zones of inshore and offshore divergence, and between zones of surface mixing to seaward and bottom mixing beneath and inshore of the front. Marked changes in surface temperature patterns within hours of wind vector reversals emphasize the sensitivity of the wind stress/surface front intensity relationship but, due to more random variability, corresponding changes are not detectable at depth. The action of mixing cells within the front is shown to combine with overturning events to produce transient sub‐thermoclinal sheets of relatively homogenous water. The cells also provide a postulated trans‐frontal advection mechanism for small quanta.

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