The Hydrochemistry and Plankton Dynamics of a Closed Eutrophic Tropical Lagoon

  • D.T Nwankwo
  • T.I Owoseni
  • D.A Usilo
  • I Obinyan
  • A.C Uche
Keywords: Closed lagoon, eutrophic, hydroclimate, plankton dynamics, tropical

Abstract

The hydrochemistry and plankton dynamics of the Kuramo lagoon was investigated between November 2000 and
August 2001. Whereas the lagoon remains low brackish (S°/oo < 4.39°/oo) and alkaline (pH > 7.8) all through the
sampling period, the dissolved oxygen (DO) and biochemical oxygen demand (BOD5) values (< 3.50 mgl-1; > 21
mgl-1) indicated stress. Although nutrient levels at the lagoon were high (NO3- N > 1.58 mgl-1; PO4-P < 0.35 mgl-1;
SO42- > 449.9 mgl-1), heavy metal values were low (Fe < 1.91 mgl-1, Cu < 0.32 mgl-1, Pb Trace). The occurrence of
Nitzschia palea, Cyclotella meneghiniana, Gomphonema parvulum, Pinnularia pyrum, P. gibba (diatoms), Euglena viridis,
Lepocinclis texta (euglenoids), Microcystis aeruginosa, M. flos-aquae (cyanobacteria), Brachionus
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Articles

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eISSN: 1015-079X