Figure 1.

Map of the sampling area. Samples of the mudprawn Upogebia africana used for genetic analyses came from the four sampling sites indicated in boldface, and those for the larval rearing experiments from the northernmost (Mngazana) and southernmost site (Swartkops). The Haga Haga Estuary is the southernmost site at which mudprawns of the subtropical lineage have so far been recorded, and the Mthatha Estuary the northernmost site at which individuals of the warm-temperate lineage have been found. The chequered area gives the approximate position of cooler water inshore of the Agulhas Current [60]. The insert shows the location of the Wild Coast region in South Africa and the distribution range of U. africana.