FACULTY OF AGRICULTURE

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    Floristic composition, diversity and community structure in a secondary rainforest in Ibadan, Nigeria
    (2021) Seyni, B.M.; Awodoyin, R.O.; Olubode, O.S.; Adeniji, S.A.; Ibrahima, D.B.
    Secondary forests may act as buffer area and serve as reservoir for biotic components that are lost from primary forest due to anthropogenic disturbances. This study investigated the floristic composition, diversity and community structure of Cocoa Research Institute of Nigeria (CRIN), Idi-Ayunre, Ibadan, Nigeria. Twenty-five main plots (each 50 m × 50 m) were randomly mapped out to enumerate tree species, five 10 m × 10 m sub-plots were systematically mapped out within each main plot to enumerate shrubs and three quadrats (1 m × 1 m) were laid in each sub-plot to enumerate herbaceous species in Wet Season (WS) and Dry Season (DS). Relative Importance Value (RIV), Taxa, Individuals, Dominance, Shannon-Wiener, Equitability and Jaccard similarity index were determined. A total of 181 plant species from 145 genera and 54 families which included 63 trees, 33 shrubs and 85 herbaceous species were enumerated. In wet season, Triplochiton scleroxylon, Lonchocarpus griffonianus and Chromolaena odorata had the highest RIV while in dry season, Terminalia superba, Lonchocarpus cyanescens and C. odorata were the highest for trees, shrubs and herbs, respectively. Low dominance but high equitability and Shannon-Weiner values indicated inter-specificity among trees, shrubs and herbs. It was only in herbs that Jaccard-similarity was less than 100% across seasons. Resilience for keystone species conservation is possible due to flora species heterogeneity of the study site.
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    Indigenous fruit trees of tropical africa: status, opportunity for development and biodiversity management
    (2015) Awodoyin, O.R.; Olubode, O.S.; Ogbu ,U.J.; Balogun, B.R.; Nwawuisi, J.U.; Orji, K.O
    Tropical fruit trees constitute important biological resources in the global agrobiodiversity context. Unlike the tropical fruit trees of American and Asian origin, indigenous fruit trees (IFT) of tropical Africa have scarcely achieved the status of international recognition in commodity markets and research arena outside Africa. This paper presented a critical review of the status of IFT in the Tropical African sub-regions (of West Africa, Central Africa, East Africa, Southern Africa and the Indian Ocean Islands) in relation to the introduced naturalised fruit trees from tropical America and Asia, threats to the diversity and sustainable use of IFT, analysis of the opportunities and challenges of developing IFT, as well as targets for crop improvement of the rich IFT of Tropical Africa. Domestication programme via relevant vegetative propagation techniques for priority IFT of the sub-regions was examined and advocated, in addition to the adoption of complementary conservation strategies, including Field GeneBanks in the management of the continent’s IFT diversity.
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    Determinants of on-farm cassava biodiversity in Ogun State, Nigeria
    (Taylor & Francis, 2015) Obayelu, O.A.; Akintundea, O.O.; Obayelu, A.E.
    Global food security depends on agro-biodiversity. However, an enormous quantum of genetic diversity of agricultural crops has been lost over the last century, and this implies vulnerability, increased economic risks, reduced food security, loss of resources for future adaptation as well as reduced and unsustainable agricultural growth opportunities. This study examined the determinants of on-farm cassava biodiversity in Ogun State, Nigeria. We profiled cassava biodiversity indices of farmers in the state according to Margalef, Shannon and Simpson diversity indices, and identified factors influencing cassava biodiversity. Data collected from 160 cassava farming households using a multistage sampling procedure were analyzed with descriptive statistics, Poisson regression and Tobit regression models. Farmers’ experience had a positive relationship with their on-farm cassava biodiversity (p < 0.1). The arable land size controlled by the farmer was positively related to Margalef (p < 0.01), Shannon (p < 0.05) and Simpson (p < 0.01) indices. However, the land squared variable was negatively related to Margalef (p < 0.01), Shannon (p < 0.05) and Simpson (p < 0.01) indices. It was recommended that appropriate agricultural land reforms should be incorporated into the agricultural transformation agenda as a key to fostering on-farm cassava biodiversity.
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    Biodiversity and ethnobotanical potentials of plant species of University of Agriculture Makurdi Wildlife Park and Ikwe Games Reserve, Benue State, Nigeria
    (International Formulae Group, 2009) Jimoh, S. O.; Debisi, L. A. A.; Ikyaagba, E. T.
    Plant biodiversity and ethnobotanical potentials of University of Agriculture Makurdi (UAM) Wildlife Park and Ikwe Games Reserve, Benue State, Nigeria, were investigated in this study. Floristic survey was conducted in the two reserves using stratified sampling technique based on the three identified microhabitats in each of the reserves. Nine plots measuring 25 m x 25 m were laid in each of the reserves to survey trees and shrubs with diameters at breast height (dbh) 5 cm and above. Within each plot, 5 sub-plots of 1 m × 1 m were established to assess plants below 5 cm dbh. Participatory ethnobotany and interview were used for the ethnobotanical survey. Seventy-one valuable species belonging to 39 families were identified. Ninety-three percent of these have more than one use; categories with medicinal uses topping the list (48%). Other uses include: wood (35%) and food (17%). Harvesting techniques in many of the species were intensive and destructive. It is suggested that harvesting of plant products in these reserves be controlled through monitoring and enlightenment.