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80 D. I. Nwankwo. andl.C. Onyema DISCUSSION From the study there were comparatively fewer numbers of species for this study viz a viz other seasonal microalgal investigations in the coastal waters of Nigeria (Nwankwo, 1988b; Nwankwo et al., 2003, Onyema et al., 2003). Comparatively, higher abundance and diversity of planktonic algal species was recorded for the dry season (November ‐ April) than in the wet season (May ‐October). For instance species ofCoscinodiscus, Chaetocerus, Biddulphia, Ditylum and Ceratium occurred more frequently in the dry season. A good number of the species encountered for this study have been recorded in marine situations elsewhere (Subramanyan, 1946, Newell and Newell, 1966; Wimmpenny, 1966). Furthermore, the occurrence of dinoflagellates species such as Ceratium furca, Ceratium fusus, Ceratium tripos and diatoms such as Chaetoceros convolutus, Cerataulina bergonii and Coscinodiscus centralis among other diatoms have also been reported to impose anoxia, clogging and damage of fish gills under bloom conditions in the same region (Nwankwo et al., 2003 a,b). The occurrence of the cyanobacteria Trichodesmium thiebautii was observed only in warm, stratified, relatively nutrient poor waters in the dry season. Nwankwo et al., (2003b) have reported that Trichodesmium thiebautii blooms in the coastal waters of south‐western Nigeria and clogging of fishing nets in bloom conditions have also been reported in the same region for this cyanobacterium Species of Oscillatoria and Phormidium encountered during the study are likely immigrant forms from land brought in with floodwaters during the rains. REFERENCES. Chinda, A.C and Pudo, J. (1991). "A preliminary checklist of algae found in plankton of Bonny River in Niger Delta, Nigeria". Fragmflor. Geobot.36 (1): 112‐126. Desikachary, T.V. (1959). Cyanophyta. Indian Council of Agric. Research, New Delhi. 686pp. Egborge, A.M.B. (1973). "A preliminary check list of the phytoplankton of the Oshun river, Nigeria". Freshwater Biol. 4: 177 ‐ 191. Foged, N. (1966). "Freshwater diatoms from Ghana". Biologiske Skrifter Det Kongelige Dansfe Videnskabernes Selskab. 15(1). 160pp F.A.O. (1969). Fisheries Survey in the Western and Mid‐ Western Regions of Nigeria. FAO/Sf: 74/NIR 6. 142pp. Fox, M. (1957). "A first list of marine algae from Nigeria". Jour. Linn. Soc. London. LV (365): 615‐631. Hendey, N.I. (1958). "Marine diatoms from West African Ports". Journal of Royal Microscopic, Society. 77: 28‐88.
A Checklist ofPlanktonic Algae off Lagos Coast Hendey, N.I. (1964). An introductory account of the smaller algae of British coastal waters. Part 5. Bacillariophyceae (diatoms) London. N.M.S.O. 317pp. Hill, M.B. and Webb, J.E. (1958). "The ecology of Lagos lagoon II. The topography and physical features of the Lagos harbour and Lagos lagoon". Philosophical Transaction of Royal Society, London. 241:307‐417. Holden, M.J. and Green, J. (1960). "The hydrology and plankton of River Sokoto". J. anim. Ecol. 29: 65 ‐ 84. Ibe, A. C. (1988). Coastline erosion in Nigeria. University Press, Ibadan. 217pp. Imevbore, A.M.A. (1965). "A preliminary checklist of the planktonic organism of the Eleiyele Reservoir, Ibadan, Nigeria". Journal of West Africa Science Association. 10: 156 ‐ 160. Kadiri, M.O. (1999). "Phytoplankton distribution in some coastal waters of Nigeria". Nigeria Journal of 'Botany.12 (1): 51 ‐ 62. Lackey, J.B. (1938). The manipulation and counting of river plankton and changes in some organism due to formalin preservation. U.S. Public Health Reports. 63, 2080‐2093. Mills, F.W. (1932). "Some diatoms from Warri, Southern Nigeria". J.R.Micro. Soc., 52:383 ‐ 394. Newell, G.E and Newell, R.C. (1966). Marine plankton: a practical guide. Revised Edition. Hutchinson London. 225pp. Nwadiaro, C.S. and Ezefili, E.O. (1986). "A preliminary checklist of the phytoplankton of New Calabar river, lower Niger delta, Nigeria". Hydrobiol. Bull. 19: 133 ‐ 138 Nwankwo D. I. (1984). "Seasonal Variation of Phytoplankton of Lagos Lagoon and the Adjacent Sea inRelation to EnvironmentalFactors"..P/i.,D77zesi's, University of Lagos, Akoka. 447pp. Nwankwo, D. I. (1988a). "A Checklist of Nigerian Marine Algae (Tarkwa Bay)". Nigerian Journal of Botany 1: 47‐50. Nwankwo, D.I. (1988b). "A preliminary checklist of planktonic algae in Lagos lagoon Nigeria". Nigerian Journal ofBotanica I Applied Sciences.. 2: 73‐85. Nwankwo, D.I. (1990). "Contribution to the Diatom flora of Nigeria. Diatoms of Lagos lagoon and the adjacent sea". Nig. J. Bot. 3: 53‐70. Nwankwo, D.I. (2004a). The Microalgae: Our indispensable allies in aquatic monitoring and biodiversity sustainability. University of Lagos Press. Inaugural lecture series. 44pp. Nwankwo, D.I. (2004b). A Practical Guide to the Study of Algae. JAS Publishers, Lagos. Nigeria. Nwankwo, D.I; Onyema, I.C.; Adesalu, T.A.; Olabode, R.J.;Osiegbu, G.O. and Owoseni, T.I. ( 2003a). "Additions to a preliminary check‐list of planktonic algae in Lagos lagoon, Nigeria". Journal of Science Technology and Environmental. 3(1). 8‐12. Nwankwo, D.I., Onyema, I.C. and Adesalu, T.A.(2003b). " survey of harmful algae in coastal waters of south‐western Nigeria". Journal of Nigerian Environmental Society. 1(2): 241 ‐ 246. Olaniyan, C.I.O. (1969). "The seasonal variation in the hydrology and total plankton of the lagoons of South West, Nigeria". Nigerian Journal of Science. 3(2): 101‐119. 81
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