Abstract
The rate of phytoplankton production in Ogelube lake, Opi was investigated for one year using oxygen light and dark bottle technique. Water samples were collected from a mid-lake location at three depths and incubated in situ for four hours around midday. The phytoplankton population in the acidified samples was estimated using sedimentation technique. Primary productivity increased with increase in phytoplankton population. Mean rate of gross production for the period of investigation was 204.18 mg Carbon/m3/hr. Mean rate of net production was 71.22 mg C/m3/hr. Mean daily gross production rate for the lake was 1582.17 mg Carbon/m3/day and mean net production was 569.75mg C/m3/day. Gross production was highest in December and lowest in May, the latter having a negative value. Primary production decreased with depth. Based on the low net production obtained, the lake can be said to be oligotrophic. Key Words: Phytoplankton, Ogelube lake, Nigeria Bio-Research Vol.1(1) 2003: 83-96
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