ADEDEJI Adebukola Adenike (nee Okunade)

Zoology Department, OAU > Instructors > Our Lecturer > ADEDEJI Adebukola Adenike (nee Okunade)

ADEDEJI Adebukola Adenike (nee Okunade)

Professor
Ph.D

PUBLICATIONS

Theses/Dissertations:

  • Okunade, A.A. (1995): The Reproduction of Cichlid fish (Oreochromis niloticus) in Opa Reservoir, O.A.U, Ile Ife, Nigeria. B.Sc. Dissertation, Obafemi Awolowo University, Ile-Ife, Nigeria. 50pp
  • Okunade, A.A. (2000): The composition and distribution of rotifera fauna of the surface waterbodies of the Benue Trough, Nigeria. M.Sc. Thesis, Obafemi Awolowo University, Ile-Ife, Nigeria. 140pp
  • Adedeji, A.A. (2011): The Water quality, Zooplankton and Macrobenthic Invertebrate Faunae in relation to Aquacultural practice and Management of Fishponds in Ife North Area, Osun State, Nigeria. PD. Thesis, Obafemi Awolowo University, Ile-Ife, Nigeria. 285pp

Books and Monographs: (List in this order with dates, Pages, references and Publisher)

Authored: Nil

Edited: Nil

Contribution to books: Nil

Published Journal Articles:

Olaleye, V.F. and Adedeji, A.A. (2005): Water and planktonic quality of a palm oil effluent impacted river in Ondo State, Nigeria. International Journal of Zoological Research 1 (1):15-20 (Pakistan) DOI: 10.3923/ijzr.2005.15.20

  • Adedeji, A.A. and Adeniyi I.F. (2006): The Rotifera fauna of waterbodies in the Gongola River drainage basin, Nigeria. Science Focus 11 (10): 66-71 (Nigeria) ISSN: 1596-7026

 

  • Adeniyi, I.F. and Adedeji, A.A. (2007): The Rotifera fauna of Gongola River basin, Northeast Nigeria. Ife Journal of Science 9(1): 1-16 (Nigeria) ISSN 0794-4896
  • Olaleye, V.F., Adewumi, A.A., Adedeji, A.A. and Ogbogu, S. S. (2009): Effects of Soy-based allochthonous nutrient inputs on intensively cultured female Clarias gariepinus (Burchell) brooder’s growth performance and on the in-dwelling net microplanktonic populations. Journal of Environmental Science and Technology 3 (2): 050 – 058 (USA) DOI: 10.5897/AJEST09.069
  • Adedeji, A.A., Aduwo, A. I., Aluko, O. A. and Awotokun, F (2011): Effect of chicken droppings as organic fertilizer on water quality and planktonic production in an artificial culture media. Ife Journal of Science 13(2): 239-249 (Nigeria) ISSN 0794-4896
  • Adedeji, A.A., Adeniyi, I.F. and Adetokunbo, O.R. (2012): The sediment characteristic and benthic macro-invertebrate fauna of some fish ponds in Ife North LGA, Nigeria. International Journal of Fisheries and Aquaculture 4(1): 7-12 (USA) DOI: 10.5897/IJFA10.005

 (vii) Adedeji, A.A., Adeniyi, I.F. and Masundire, H. (2013) Zooplankton abundance and diversity of fishponds exposed to different management practices. International Journal of Biological and Chemical Sciences 7(2): 631-640. (Cameroon) DOI: 10.4314/ijbcs.v7i2.19

(viii) Adedeji, A.A. and Adeniyi, I.F. (2013): Effects of Pond Fertilization on the Physico-chemical water Quality of selected Earthen Fishponds in Ife North Local Government Area, Osun State, Nigeria. The Zoologist 11: 13-20. (Nigeria) ISSN 1596 972X

(ix) Komolafe, O.O., Adedeji, A.A. and Fadairo, B. (2014): Assessment of the water quality parameters in relation to fish community of Osinmo reservoir, Ejigbo, Osun State, Nigeria. International Journal of Biological and Chemical Sciences 8(2): 596-609 (Cameroon) DOI: 10.4314/ijbcs.v8i2.18

(x) Komolafe, O. O., Arawomo, G. A. O., Idowu, E.O. and Adedeji, A.A. (2014): Status and economic impact of the fisheries of Osinmo reservoir, Ejigbo, Nigeria. Ife Journal of Science 16(2): 309-317. (Nigeria) ISSN 0794-4896

(xi) Adedeji, A.A., Komolafe, O.O., Akinrele, O. A. and Adeleke, O. (2015): Water quality and plankton biota of Osinmo reservoir, Osun State, South-west Nigeria. Zoology and Ecology 25(2):143-153. (Lithuania)

       DOI: 10.1080/21658005.2015.1029355

(xii) Komolafe O.O., Olofinmehinti M.O., Adedeji A.A. and Adewole H. A. (2016): The Distribution, composition and abundance of Fish species in two abandoned gold mine Reservoirs, Igun, Osun State Nigeria. Ife Journal of Science 18(1): 095-102. (Nigeria) ISSN 0794-4896

(xiii) Adesakin, T.A., Adedeji, A. A., and Taiwo Y.F. (2016): Temporal and spatial fluctuations in the heavy metals of Opa reservoir, Obafemi Awolowo University Ile Ife, Nigeria. African Journal of Aquatic Science 41(4): 435 – 443 (South Africa). DOI:10.2989/16085914.2016.1246355

(xiv) Adesakin, T.A., Adedeji, A. A., Aduwo, A. I. and Taiwo Y.F. (2017): Effect of discharges from re-channeled rivers and municipal runoff on water quality of Opa reservoir, Ile-Ife, Southwest Nigeria. African Journal of Environmental Science and Technology 11(1): 56-70. (USA) DOI:10.5897/AJEST2016.2086

(xv) Adedeji A.A., Olajide J.S., Aluko T.I., Muhibbu-din I. O. (2017): Plankton abundance and physico-chemical water quality of effluent impacted water-bodies in Ile-Ife, Nigeria. Notulae Scientia Biologicae 9(2):169-176 (Romania). DOI: 10.15835/nsb9210074

(xvi) Bolawa O. P., Adedeji A. A., and Taiwo Y.F. (2018): Temporal and spatial variations in abundance and diversity of zooplankton fauna of Opa Reservoir, Obafemi Awolowo University, Ile Ife, Southwest Nigeria. Notulae Scientia Biologicae 10(2): 265-274 (Romania). DOI: 10.25835/nsb10210170

(xvii) Bolawa O. P., Adedeji A. A., and Taiwo Y.F. (2018): Ecological status of Opa Reservoir, Obafemi Awolowo University, Ile Ife, based on the abundance and diversity of its planktonic flora. Notulae Scientia Biologicae 10(2): 287-296 (Romania). DOI: 10.25835/nsb10210248

*(xviii) Taiwo, Y.F., Adedeji, A.A. and Adesakin, T.A. (2018): The ecological balance of the fish community in an aging reservoir. Natural Resources 9: 327-335. https://doi.org/10.4236/nr.2018.99020

*(xix)    Odeyemi E.O., Adedeji A.A. and Odeyemi O.J. (2018): Effects of discharge from car wash on the physico-chemical parameters and planktonic abundance of Odo-ebo River, Ile-Ife, Nigeria.  Acta Universitatis Sapientiae Agriculture and Environment 10: 83-96

(xx)  Adedeji A. A., Adesakin T.A., Bolawa O. P., Nkado H. C., Oladimeji E. B.,  Ogunmola A. O., Salahudeen A. F.  (2019): Impact of Abattoir effluent on Water quality, Plankton community and Microbial Load of Opa River, Ile Ife, Nigeria. Environtropica 15: 30 -54 (Nigeria)

*(xxi) Adedeji A. A., Adesakin T. A., Oni T. M., Oyebamiji S. P., Olowogboyega V. T. (2019): Spatio-temporal distribution, abundance and diversity of zooplankton community structure in River Shasha, Southwestern Nigeria. World News of Natural Sciences 24: 300-322 (Poland)

*(xxii) Adesakin, T.A., Adedeji, A. A. Oyewale, A.T., Oni, T.M., Oyebamiji, S.P. and Olowogboyega, V.T. (2019): Ecological Studies of Phytoplankton Distribution and Abundance in River Shasha, Southwestern Nigeria. International Journal of Research and Innovation in Social Science 3(7): 259 – 269

Edited and Refereed Conference Proceedings: Nil

Articles Accepted for Publication:

Manuscript Submitted for Publication: Nil

Creative Work: Nil

Technical Report: Nil

Paper and Works in Progress:

    • Comparative study of plankton diversity and water quality characteristic of Opa reservoir.
    • Effects of cassava processing effluent on the water quality and planktonic community of Ilu-Okesaji Stream, Osun State, Nigeria

 

PROFESSIONAL ACCOMPLISHMENT:

The negative impact of various anthropogenic activities and hydrological alterations of Nigeria waterbodies on water quality and biodiversity of planktonic biota were revealed through my research activities. These discoveries brought to light the potential health risks to which the aquatic biota and human users of these waterbodies are exposed as well as the measures to be taken for sustainable and healthy aquatic ecosystem.

CONTRIBUTIONS TO KNOWLEDGE:

My work in the field of Hydrobiology has focused basically on the biological productivity, ecological and trophic status of waterbodies through researches on their biota diversity, community structure and physicochemical water quality parameters. The impact of anthropogenic activities on water quality, abundance and/or diversity of plankton organisms were also studied at semi-field and field level.

My first research as published in paper E4 (i) revealed the negative effect of palm oil mill effluent on the water quality and planktonic biota of River Oluwa. The waterbody was slightly acidic at the various sampling sites resulting from the raw effluents being discharged into the aquatic environment which were acidic colloidal suspension characterized by high suspended solid load and Chemical Oxygen Demand. The colloidal suspension increased the waterbody turbidity at the sites thereby affecting algal photosynthetic activities by decreasing the depth of the euphotic zone. The dominance of filamentous green algae in the waterbody further confirmed the water quality disturbance for these serve as sinks for accumulation of carbon, nitrogen and phosphorus.

The effect of use of chicken droppings as organic fertilizer in fish pond on aquatic biota was also investigated using semi-field media. The result  as published in paper E4 (v) revealed the negative impact this aqua-cultural activity could have on chemical properties which varied significantly among the treatments though it supported abundant growth of planktonic organisms.  The observed high algal bloom had an increasing effect on pH while increase in productivity of zooplankton had effect on colour change of the media.

More field studies on the effect of effluent / anthropogenic run off on waterbodies as reported in papers E4 (xv) and (xvi)  revealed higher concentration of nutrient parameters at the effluent receiving sites on the waterbodies as well as great abundance of planktonic species associated with organic pollution besides microbial species of high health significance.

My Ph.D. research was on Fisheries aspect of Hydrobiology and the effects of aqua-cultural practices in fertilized and non-fertilized ponds on the zooplankton, macro-benthic invertebrate fauna and physico-chemical properties of ponds water and sediment were investigated. The research produced papers E4 (vi), (vii) and (viii). I discovered that the fertilized ponds were more saline (based on conductivity and Total Dissolved Solid), better buffered and richer in nutrient than the unfertilized ponds. These effects were enhanced by flowage hence the fertilized flow-through ponds were characterized by the most suitable water quality for fish culture in the study-area while the fertilized non-flow-through ponds was least suitable. Moreover, the fertilized ponds supported zooplankton abundance while continuous water flow as observed in the flow-through had direct influence on diversity and species richness. Hence, to achieve the desired effect, pond fertilization must be accompanied by adequate water flowage especially in shallow fishponds. The study also revealed abundance of pulmonates (mollusk) on the earthen ponds’ bottom sediment which are indictaors of meso-saprobic-eutrophic status thus the ponds though nutrient rich are slightly polluted.

Another aqua-cultural study on the effects of Soy-based allochthonous nutrient inputs on intensively cultured female Clarias gariepinus (Burchell) brooder’s growth performance and the in-dwelling net micro-planktonic populations as published in paper E4 (iv) revealed that the assayed water quality parameters for the different culture media were not statistically different from each other (P > 0.05). The best growth performance recorded in the female brood-fish fed with soy-based allochthonous diet (autoclaved for 25minutes) was significantly higher (P <0.05) than in the other broodfish fed other soybean-based diets. The richest floristic composition with 21 species and a Margalef’s Richness Index (R1) of 1.66 was also obtained in the culture medium receiving soy-based allochthonous diet (autoclaved for 25minutes) input.

The assessment of water quality parameters in relation to fish community of Osinmo (E4 (ix), (x), (xi)) and Igun (E (xii)) Reserviors revealed that physico-chemical water quality parameters (dissolved oxygen, biological oxygen demand, acidity, conductivity, water transparency and temperature) of these waterbodies had direct impact (positively and negatively) on the in-dwelling fish well-being, composition, distribution and abundance.

My research endeavor has produced 5 M.Sc. degree holders whose projects have been based on effect of hydrological alterations/anthropogenic run off on the biota and physico-chemical properties of water-bodies studied. The first 2 projects were based on the effects of discharges  from rechanneled rivers and municipal runoffs into Opa Reservoir on its water quality as published in papers E4 (xiii) and (xiv) as well as diversity and abundance of its planktonic biota  which was also produced papers E4 (xvii) and (xviii)). The effect of discharges was reflected in 19 out of 29 investigated physico-chemical parameters that showed statistically significant differences seasonally. Moreover, the decrease in the recorded concentrations of DO, TSS, TS, organic matter and TOC from the riverine zone towards the lacustrine zone also revealed the effect of influxes from the catchment upstream. The recorded level of toxic heavy metal concentration (Cd (0.031 mg/l) and Ni (0.905 mg/l) in the reservoir could be of potential health risk to the water consumers. In addition, a more recent and comprehensive checklist of planktonic flora and fauna of Opa reservoir was also produced which revealed the biological productivity, ecological status of the reservoir. Notable bio-indicator plankton species recorded were Anabaena circinalis, Anabaena flos-aquae, Microcystis sp., Aphanocapsa litoralis and Microcystis aeruginosa. Some other pollution indicator species recorded were Synedra ulna, Oscillatoria agardhii, Phacus sp., Surirella sp., Closterium sp., Aphanocapsa sp. and Euglena sp. Opa reservoir was reported to be very rich in Bacillariophyta (diatoms), followed by Cyanophyta (bluegreen) and Chlorophyta (green algae) which are known to characterize eutrophic lakes. More also, certain Rotifer species that characterized with eutrophic communities were recorded and these include Anuraeopsis fissa, Keratella tropica, Filinia sp., Brachionus angularis, B. calyciflorus, Trichocerca sp. and Polyarthra sp.

Similar study on the Rotifera fauna of the surface water bodies in the Upper Benue Trough, from my M.Sc. research work as published in E4 (ii) and (iii) revealed some species with potential to serve as indicators of water habitat type. These include Asplanchna priodonta and Mytilina ventralis which were restricted to lentic waterbodies. I also discovered that occurrence and abundance of Rotifera species were strongly influenced by seasonality in rainfall and flood discharge pattern in the River basin.