Summary of physical environment.

<p>Average water-depth and sediment texture encountered at each of the sites sampled off southwestern Africa during 2003: Shannon Index (H’) describing diversity of Folk’s (1954) sediment group, and sampling date also shown. Data as mean (standard deviation); N = 9, in all cases.</p><p>* Similar sampling depths, as determined from Tukey post-hoc testing, shown by common symbol.</p><p>‡ Similar sampling depths, as determined from Tukey post-hoc testing, shown by common symbol.</p><p>Summary of physical environment.</p>