The zooplankton of Mgazana, a mangrove estuary in Transkei, Southern Africa

  • T Wooldridge


Mgazana, a mangrove estuary inTranskei, was investigated from May 1972 to March 1973 at six-week intervals. Salinities were consistently above 25 parts per thousand in the middle and lower estuary. In the upper estuary the salinity varied between 4 and 29 parts per thousand. Water temperatures varied between I5.5°C and 28°C. One hundred and fifteen taxa of zooplankton organisms were recorded in the samples. The copepods Acartia naialensis and Oithona brevicornis reached high population densities and numbers exceeding 100 000/m3 of water were recorded. Mysids were major contributors to zooplankton biomass. A maximum biomass of I 200 mg/m3 was recorded in February in the middle estuary and was attributed to the mysid Mesopodopsis africana. Species of mysids showed clear seasonal and spatial patterns of distribution in the estuary.

Journal Identifiers

eISSN: 2224-073X
print ISSN: 1562-7020