Original Articles

ZOOPLANKTON AND ENVIRONMENTAL CONDITIONS IN GROENVLEI, SOUTHERN CAPE, DURING 1976

DOI: 10.1080/03779688.1980.9633200
Author(s): D.J. CoetzeeCape Department of Nature and Environmental Conservation, South Africa

Abstract

The zooplankton and environmental conditions in Groenvlei were studied during 1976 as part of an overall ecological study of the zooplankton of the Wilderness Lakes system. The Groenvlei water was found to be well mixed and low in dissolved PO4−P, The mean zooplankton standing crop was 10 mg dry mass m−1, and the zooplankton numbers reached a maximum in autumn (April/May). The zooplankton population was dominated by cyclopoid copepods, including Mesocyclops leuckarti. The majority of the taxa occurred near the bottom of the lake during daytime. Groenvlei contains a relict estuarine fauna consisting of invertebrates such as Grandidierella lignorum and Pseudosphaeroma barnardi, and the fish species Gilchristella aestuarius and Hepsetia breviceps.

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