Journal of
Ecology and The Natural Environment

  • Abbreviation: J. Ecol. Nat. Environ.
  • Language: English
  • ISSN: 2006-9847
  • DOI: 10.5897/JENE
  • Start Year: 2009
  • Published Articles: 389

Full Length Research Paper

Temporal variations in water chemistry and chlorophyll-a at the Tomaro creek Lagos, Nigeria

Nwankwo, D. I1, Adesalu2, T. A, Amako, C. C1, Akagha, S.C1 and Keyede, J. D2.
1Department of Marine Sciences, University of Lagos, Akoka, Lagos. Nigeria. 2Department of Botany, University of Lagos, Akoka, Lagos, Nigeria.  
Email: [email protected]

  •  Accepted: 22 May 2013
  •  Published: 31 July 2013

Abstract

Temporal variations of the water chemistry and chlorophyll-a dynamics at the Tomaro creek Lagos were investigated for six months (October, 2007 to March, 2008). Temperature remained high (>27°C) all through the sampled period while total suspended solids andtransparency increased in the dry months. Total dissolved solids were high (≥8160 mg/L) between December and March while lower values (≤2529 mg/L) were recorded between October and November. Salinity, conductivity and pH values increased steadily during the sampled months. Chemical oxygen demand and biological oxygen demand values at the site remained low (<12.80 mg/L; ≤2.0 mg/L) between the period free of organic pollution and moderately (≤52.2 mg/L; 7.0 mg/L) organically polluted period. Heavy metals (Pb, Fe, Cu) especially Fe followed almost same pattern as chlorophyll-a recorded. Phytoplanktonabundance dropped (80cells/ml) between November and December. Phytoplankton diversity was high while the species were evenly distributed.

 

Key words: Tidal creek, water chemistry, chlorophyll-a, phytoplankton