One hundred and seven insects and arachnids were found associated with the succulent-leaved annual Zygophyllum L. (Zygnphyllaceae) in the central Namib Desert . The species are tabulated according to trophic niche. Resident species are discussed with emphasis on behaviour, diet and seasonal periodicity. Several parasitoids were reared and associated with their hosts. Many of the species found on Z. simplex appear to be undescriptionbed.
Food or Proteles cristatus in the Namib Desert during two years consisted mainly of termites Trinervitermes sp. with other insects playing a subsidiary role. Foraging involves patch utilisation, with up to 15 min. feeding in one patch resulting. Patches can be up to 100 m apart, and time spent in patches and distance between patches probably reflect patterns or food abundance. Aardwolves cover just over 1 km h 1 while foraging and home ranges overlap extensively.
Wild springbok Antidorcos marsupalis, in the Ethosha National Park, were observed while feeding in groups of varying size, and the numbers of vigilant (neck erect, head up) animals recorded. The proportion of vigilant springbok declined as group size increased. However, an individual's feeding time apparently does not increase and may even decline in groups larger than about 25 animals. These findings are discussed In relation to anti-predator and other benefits resulting from grouping.
The food intake of eight ostriches in the Namib-Naukluft Park, South West Africa, was determined through the analysis of stomach contents. Additional data were obtained by direct field observation of two hand-reared individuals. According to this the ostrich is an opportunistic feeder which utilises a wide variety of plant species.
In 1974 the authors elaborated an initial geomorphological outline of the Kuiseb River valley up-stream of Gobabeb. Subsequently other authors contributed to the geomorphology of this region and published differing results. Consequently we re-checked the area in 1978 and obtaind the following conclusions: The beginning of gramadulla formation can hardly be pinpointed (? Post-Stormberg), the depth of incision has to be explained tectonically to a large extent.
Rainfall distribution during individual storm was monitored over a 100 km2 m of the Namib Desert Park during 1974. Five of these storms and cumulative totals of precipatation are examined. The explanations for storm occurence and for precipitation distribution within the study area are not obvious. The availability of additional data of this nature may assist with interpretation.