Response of Four Phytoplankton Species Found in Some Sectors ofNigerian Coastal Waters to Crude Oil in Controlled Ecosystem
2010
Identification and enumeration of phytoplankton species from Ilaje and
Lagos sectors of the Nigerian coastal waters were conducted using
standard procedures. Effects of different crude oil concentrations (6
to 50 ppm) on population of Coscnodiscus centralis , Thalassionema
frauenfeldii , Odontella mobiliensis , and Ceratium trichoceros at
different exposure periods (6 to 42h) via microcosm experiments were
then assessed. Results showed that the phytoplankton species consisted
of diatoms (83.33%) and dinoflagellates (16.67%) whose abundance ranged
from 2 to 516 Cell/mL. Crude oil toxicity varied from 0.06 to 36.43%
for C. centralis, 1.41 to 35.58% for C.trichoceros, 1.71 to 46.11% for
T. frauenfeldii and 0.66 to 44.90% for O. mobiliensis and showed direct
relationship (r -+ 0.81 to +0.97; p < 0.001) with concentration but
inverse with exposure period (r = -0.83 to – 0.90; p < 0.001).
Vulnerability within 24-h contact decreased in the order: T.
frauenfeldii > O. mobiliensis > C. centralis > C. trichoceros.
Study is a contribution to the scarce data bank on crude oil
doseresponse assessment on plankton species in Nigeria, demonstrating
that influx of crude oil into the Nigerian coastal waters is a risk
factor to ecological status.
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