Visiting Scholar



Dr. Owojori is a Visiting Scholar at the Obafemi Awolowo University, Ile-Ife, Nigeria and a Research Scientist at the University of Saskatchewan, Canada. He bagged his PhD at Stellenbosch University, South Africa in 2009, and subsequently acquired two postdoctoral fellowships in Canada (2009-2011) and Germany (2011-2012). The latter was sponsored by the prestigious Alexander von Humboldt Fellowship, Bonn Germany. He is recipient of several awards both as a student and researcher. Apart from several conference grants, he was awarded the best student presentation at the International Conference on Contaminated Soil Sediment and Water at the University of Massachussett, Amherst, USA in 2008. As a former DAAD (2006-2009), and Humboldt scholar he was awarded DAAD staff Exchange Fellowship as a visiting Professor at the Department of Environmental Sciences, Faculty of Science, North West university, South Africa in 2014. Olugbenga was also recipient of The World Academic Services (TWAS) Research grant in basic science ($17,500), as well as Alexander von Humboldt Research (6000 Euro) and Equipment (40,000 Euro) grants between 2014 and 2019. He was also a recipient of TWAS-DFG 2-month visiting fellowship to the University of Bremen, Germany in 2014. In 2011 he was awarded the Dapo Afolabi Most Productive Science Scholar at the Obafemi Awolowo University, le-Ife, Nigeria. Recently in April, 2018, he was invited (as one of ten global experts) to Rome, Italy by the Food and Agriculture Organisation of the United Nations to develop a Pesticide Registration Toolkit for use in developing countries. During the course of his academic career, Olugbenga has published at least 30 research articles (H-index of 16) and presented his research in more than twenty international and local conferences. He was also a member of the scientific committee and a Session Chair, Soil Ecotoxicology and Other Stressors Session, at the International colloquium on Soil Zoology, Coimbra, Brazil, August 5, 2012. Dr. Owojori is deeply involved in community service. He is the initiator and co-ordinator of a short course programme tagged, ‘Foundational Research Skills in the Life Sciences’, which hosted at least 40 Postgraduate students from across the Faculty of Science and other allied faculties at the Obafemi Awolowo University, Ile-Ife, Nigeria every year.




  1. Gainer A, Owojori OJ, Maboeta M (accepted). Use of Soil invertebrate avoidance tests as an emerging tool in soil Exotoxicology. Review of Environmental Contamination and Toxicology
  2. Glory U. Chibee ,Olajumoke M. Ojelabi ,Hamzat O. Fajana ,Bolajoko A. Akinpelu ,Temitope O. Kehinde ,Olufemi M. Awodiran ,Efere M. Obuotor ,Olugbenga J. Owojori , Effects  of  cypermethrin  as  a  model  chemical  on  life  cycle  and  biochem-ical  responses  of  the  tropical  stingless  bee  Meliponula  bocandei  Spinola,  1853,EnvironmentalAdvances(2021), doi: https://doi.org/10.1016/j.envadv.2021)


  1. Wei Han; Zaiqiang Yang; Lidong Huang; Olugbenga John Owojori; Chenxi Sun; Mengyuan Hou (2020). Foliar application of zinc alleviates the adverse effects of heat stress in Pakchoi (Brassica chinensis L.) Plant Growth Regulator
  2. Umeh A.C., Naidu R., Owojori O.J., Semple K.T. (2020) Bioavailability and Bioaccessibility of Hydrophobic Organic Contaminants in Soil and Associated Desorption-Based Measurements. In: Ortega-Calvo J.J., Parsons J.R. (eds) Bioavailability of Organic Chemicals in Soil and Sediment. The Handbook of Environmental Chemistry, vol 100. Springer, Cham. https://doi.org/10.1007/698_2020_521


  1. Hamzat O. Fajana, Amy Gainer, Olukayode O. Jegede, Kobby F. Awuah, Juliska I. Princz, Olugbenga J. Owojori and Steven D. Siciliano (2019). Oppia nitensL. Koch, 1836 (Acari: Oribatida): A critical review on the current status of its biology, ecology, and relevance as a model invertebrate in soil ecotoxicology. Environmental Toxicology and Chemistry. 38 (12), 2593-2613


  1. Michiel Adriaan Daam, Sónia Chelinho; Júlia Niemeyer; Olugbenga Owojori; Mangala de Silva; Jóse Paulo Sousa; Cornelis van Gestel; Jörg Römbke (2019). Environmental risk assessment of pesticides in tropical terrestrial ecosystems: current status and future perspectives. Ecotoxicology and Environmental Safety, 181, 534-547


  1. Jegede,O.O., Awuah, K.F., Fajana, H.O., Owojori, O.J, Hale, B.A., Siciliano S.D (2019). The forgotten role of toxicodynamics: How habitat quality alters the mite, Oppia nitens, susceptibility to zinc, independent of toxicokinetics. Chemosphere 227, 444-454


  1. Gainer, A. Akre, R., Owojori, OJ, SD Siciliano, SD (2019). Protecting vulnerable individuals in a population: is the avoidance response of juvenile soil invertebrates more sensitive than the adults response? Chemosphere 220, 658-667.


  1. Owojori, O.J., Ademosu O.T, Fajana H.O., Jegede, O.O., Kehinde T.O, Badejo M.A.

(2019). Tropical oribatid mites in soil toxicity testing: Effect of two model chemicals

(cadmium and dimethoate) on Muliercula inexpectata. Chemosphere 218,948-954



  1. Jaabiri Kamoun, I., Jegede,O.O., Owojori, O.J., Bouzid,J., Gargouri, R., Römbke, J.,

(2017). Effects of deltamethrin, dimethoate and chlorpyrifos on survival and reproduction

of the Collembolan, Folsomia candida and the predatory mite, Hypoaspis aculeifer in

two African and two European soils. Integrated Environmental Assessment and




  1. Fajana, H., Amusan, B.O., Koleosho, A., Owojori, O.J., (2017). Acute toxicity of a

household bleach, sodium hypochlorite to a whirligig beetle Orectogyrus

            alluaudi Regimbart, 1889 (Coleoptera:Gyrinidae). Aquatic Insects. 38 (1–2), 93–100.


  1. Jegede, O.O., Owojori, O.J., Römbke, J., (2017). Temperature influences the toxicity of

deltamethrin, chlorpyrifos and dimethoate to the predatory mite Hypoaspis

            aculeifer (9: 1–13Acari) and the springtail Folsomia candida (Collembola).             Ecotoxicology and Environmental Safety 140, 214–2211.



  1. Owojori, O.J., Siciliano, S.D., (2015). Potentiation of zinc toxicity by soil moisture in a boreal forest ecosystem. Environmental Toxicology and Chemistry, 34 (3), 600-607


  1. Huguier, P., Manier, N., Owojori, O.J. Bauda, P Pandard P, Römbke J (2015). The use of soil mites in ecotoxicology: a review. Ecotoxicology 24 (1), 1-18



  1. Owojori, OJ Reinecke AJ (2014). Differences in ionic properties of salts affect saline

toxicity to the earthworm Eisenia fetida. Applied Soil Ecology 83, 247-252


  1. Owojori, OJ Waszak, K Roembke, J. (2014). Avoidance and reproduction tests with the

predatory mite Hypoaspis aculeifer: effects of different chemical substances.

            Environmental Toxicology and Chemistry 33 (1), 230-237


Owojori, Olugbenga John. Regulatory pesticide risk assessment in Africa. Invited presentation as a member of a working committee with Food and Agriculture Organization of the United Nations, Rome, Italy, April 23-25, 2018

  2. Cody Teron, Amy Gainer, Olugbenga J. Owojori, Steven Siciliano. Does the springtail Folsomia candida avoid free or total metals? SETAC North America Conference, Sacaramento, USA, November 3-7, 2018


  1. Olukayode O. Jegede, Olugbenga J. Owojori, Tola M. Badejo: The influence of

anthropogenic disturbance on the temporal distribution of the weaver ant Oecophylla

longinoda. CSEE Conference, Saskatoon, Saskatchewan, Canada. May 21-25, 2015.


  1. Olugbenga Owojori, Olukayode Jegede, Adetola Badejo, Jorg Roembke; Effects of temperature on the toxicity of organophosphate pesticides (dimethoate and chlorpyrifos) to the predatory mite Hypoaspis aculeifer and Collembolan Folsomia candida. SETAC North American Conference, Vancouver, BC, Canada, November, 9-13, 2014