Zooplankton associations in some Ethiopian crater lakes

SUMMARY. 1. The zoopiankton associations in five crater lakes in Ethiopia were examined in April 1984. The two least alkaline lakes had the most diverse zoopiankton.
2. The large diaptomid copepod Lovenula africana was present in the lakes with alkalinities between 10 and 63 meq l⁻¹, but was absent from Lake Chitu (239 meq l⁻¹).
3. The contribution of the zoopiankton to the nocturnal deoxygenation of Lake Aranguadi is negligible.