Papers by Rodrigue Idohou
Zenodo (CERN European Organization for Nuclear Research), Sep 19, 2022
The mature seeds of Khaya senegalensis are from 2 to 2.5 cm long and weigh 289 g per 1000 seeds. ... more The mature seeds of Khaya senegalensis are from 2 to 2.5 cm long and weigh 289 g per 1000 seeds. These seeds contain about 67% oil by weight. This oil, which is fairly rich in oleic acid (66%), is used in West Africa for cooking, for cosmetics, as an insecticide and in traditional medicine. Prospecting to enhance the development of this oil in Chad, the present study aims to determine the physico-chemical properties of this oil according to bioclimatic zones. The density, acidity, peroxide value, moisture content and percentage of impurities were the parameters studied. The results showed that the crude oil of the seeds of K. senegalensis has the qualities close to those of other edible oils. The study also showed that climate has influenced the physico-chemical parameters of this oil. Further and more research investigations are necessary to guide decisions on the valorisation and large-scale production of this oil.
Southern forests, Dec 20, 2022
Heliyon, Mar 1, 2022
Caesalpinia bonduc (L.) Roxb is a medicinal plant with high therapeutic values but declared extin... more Caesalpinia bonduc (L.) Roxb is a medicinal plant with high therapeutic values but declared extinct in the wild in Benin. This study explored the potential distribution and climatic suitability of the species under the present-day and future conditions in Benin, based on two Representative Concentration Pathways (RCP4.5 and RCP8.5) at the 2055-time horizon. The occurrence data were recorded in the distribution area of the species in Benin. These data were supplemented with those from the Global Biodiversity Information Facility (GBIF, www.gbif.org) website and the literature. A total of 23 environmental variables (15 bioclimatic data and 8 biophysical data) were used. The Bioclimatic variables for temperature and humidity were downloaded from Africlim site at 1 km resolution. The biophysical variables concern population, elevation, slope, landcover, wetland, distance to river, soil and distance to dwellings data that are downloaded respectively from DIVA-GIS, ISRIC and SEDAC website at different resolution. A correlation test has been applied to eliminate the highly correlated variables (r ≥ 0.9) using Pearson correlation coefficient. Species distribution modelling data were processed using five algorithms namely Random Forest (RF), Boosted Regression Trees (BRT), Maximum entropy (MAXENT), Generalized Linear Models (GLM) and Generalized Additive Models (GAM). The results showed that all models performed well with the area under the curve (AUC) values greater than 0.9. The RF, GLM, and GAM models predicted an increase in the suitable areas for the cultivation of the species. BRT and MaxEnt showed a substantial decrease in the suitable areas based on the two scenarios but this reduction is more observed with the MaxEnt model. These results show that climate change and human pressures will have significant effects on the distribution of C. bonduc throughout Benin. Sustainable management measures are necessary for C. bonduc and should be integrated in development policies to preserve the population of the species from total extinction in Benin.
Journal of Arid Environments
Journal of Arid Environments, Mar 1, 2022
Frontiers in Conservation Science
Sustainable conservation of crop wild relatives is one of the pathways to securing global food se... more Sustainable conservation of crop wild relatives is one of the pathways to securing global food security amid climate change threats to biodiversity. However, their conservation is partly limited by spatio-temporal distribution knowledge gaps mostly because they are not morphologically charismatic species to attract conservation attention. Therefore, to contribute to the conservation planning of crop wild relatives, this study assessed the present-day distribution and predicted the potential effect of climate change on the distribution of 15 Vigna crop wild relative taxa in Benin under two future climate change scenarios (RCP 4.5 and RCP 8.5) at the 2055-time horizon. MaxEnt model, species occurrence records, and a combination of climate- and soil-related variables were used. The model performed well (AUC, mean = 0.957; TSS, mean = 0.774). The model showed that (i) precipitation of the driest quarter and isothermality were the dominant environmental variables influencing the distribu...
SCIENCES DE LA VIE, DE LA TERRE ET AGRONOMIE, 2021
Risques agro-météorologiques et production du riz pluvial (Oryza spp.) au Bénin Moudjahid Akorédé... more Risques agro-météorologiques et production du riz pluvial (Oryza spp.) au Bénin Moudjahid Akorédé Wabi (1, 2)* , Wouter Vanhove (1) , Rodrigue Idohou (2,3) , Achille Hounkpèvi (2) , Romain Lucas Glèlè Kakaï (2) , Patrick Van Damme (1, 4) L'irrégularité des pluies et la baisse pluviométrique constituent des préoccupations majeures pour les producteurs de riz pluvial. Cette étude avait pour objectif de mettre en évidence les variabilités et tendances des débuts et fins des pluies ainsi que de la pluviométrie totale sur une période de 46 ans dans les localités de Glazoué, Malanville et Tanguiéta (Bénin) afin de déterminer les dates favorables aux semailles de riz pluvial. Pour ce faire, les données pluviométriques journalières (1970-2016) de trois stations météorologiques situées dans ces localités ont été collectées à l'Agence Météorologique du Bénin. Les statistiques descriptives ont permis de comparer les variabilités pluviométriques. Les tendances ont été évaluées par le test de Mann-Kendall et la pente de Sen. Les probabilités de survenue des séquences sèches ont été calculées en utilisant la chaîne de Markov d'ordre 1. Il ressort de cette étude une variabilité importante des débuts des pluies avec des tendances tardive (4%) et précoce (17%), contrairement à la variabilité faible des fins. Les dates du 9 mai au 3 juillet restent favorables aux semailles du riz pluvial à Tanguiéta. Aucune date n'a été favorable aux semailles du riz pluvial à Glazoué et Malanville, du fait des probabilités très élevées (0,7 à 1) des séquences sèches (> 5 jours) préjudiciables à la floraison et compromettant sa productivité. Ces résultats confortent les riziculteurs dans la production des variétés à cycle court < 100 jours et permettent de les orienter dans le choix des dates de semis ainsi que celui des variétés adaptées de riz pluvial. Mots-clés. Riz pluvial ; tendances climatiques ; chaîne de Markov ; séquences sèches ; calendrier cultural. Title: Agro-climatic risks and producing of rainfed rice (Oryza spp.) in Benin Irregular and reduced rainfall are major concerns for rainfed rice producers. The objective of this study was to analyze the yearly variability and trends of the onset and the end of rains as well as of total rainfall over a period of 46 years in Glazoue, Malanville and Tanguiéta (Benin) in order to better determine the appropriate dates for rainfed rice sowing. For this purpose, daily rainfall data (1970-2016) were collected from three weather stations located in these localities from the Benin National Weather Agency. Descriptive statistics were used to compare rainfall variability. Trends were assessed by Mann-Kendall test and Sen's Slope. The probabilities of occurrence of a dry period were calculated using the Markov chain of order 1. Unlike the end of the rains, where little variability was observed, a significant variability in the onset of rains with late (4%) and early (17%) trends was found. Depending on the rice variety, the period from 9 May to 3 July is appropriate for rainfed rice sowing in Tanguiéta. In the case of, Glazoue and Malanville, no appropriate date for rainfed rice sowing was observed, due to the very high probabilities (0.7 to 1) of dry period (> 5 days) at flowering stage, which compromising its productivity. These results should encourage rice producers to grow varieties with short < 100 days maturing dates and can guide them in the choice of suitable planting dates and suitable varieties of rainfed rice.
Modeling Earth Systems and Environment
Advances in Traditional Medicine, 2020
Hypertension is a global public health problem. This study aimed to determine the diversity of pl... more Hypertension is a global public health problem. This study aimed to determine the diversity of plant species used by traditional healers. Thus, semi-structured interviews were carried out with 195 informants through traditional healers associations of Sanmatenga, Bazega and Zounweogo located in different phytogeographical sectors. Questionnaire referred mainly to plants vernacular names, organs used and recipes formulation. Citation frequencies and use values were calculated for each plant. Data were then submitted to comparison tests and multivariate statistics in R program. Traditional healers of Sanmatenga, Bazega and Zounweogo used respectively 70 species, 64 and 88 species for the hypertension management. However, the Jaccard index of similarity showed that there was no similarity between three associations demonstrating the importance of climatic gradient in the availability of species used. The age, sex and association belonging traditional healer did not influence species richness but, were determinants for use patterns of the plant. These results show that a sociodemographic parameter alone cannot be decisive for several local knowledge at once, but rather the interaction with other factors. Thus, the sustainable use of plant resources by the traditional healers recommends that the effects of this interaction of the various factors be taken into account.
Trees, Forests and People
Bombax costatum is one of the multipurpose indigenous species in Mali, found in the Sudanian and ... more Bombax costatum is one of the multipurpose indigenous species in Mali, found in the Sudanian and Sudano-Guinean climatic zones with an important socioeconomic contribution. This study assessed the potential impact of climate change on the geographic distribution of B. costatum in Mali, using the 19 bioclimatic variables downloaded from Worldclim at a 2.5 arc-minute resolution and 2013 occurrence points across west-Africa gathered from GBIF and fieldwork. The future niche of species was predicted using three climate models (CanESM5, CNRM-CM6, MIROC6) and four climatic scenarios (Shared Socioeconomic Pathways: SSP126; SSP245; SSP370 and SSP585) at two time periods (2021–2040 and 2041–2060). The study shows that the current suitable habitats for B. costatum species represent 10.780% of Mali territory. According to the climatic scenarios, the species distribution range especially its highly suitable areas will increase by 2040 and 2060. Moreover, the species could be found in some parts of the Sudano-Sahelian zone in the future. Therefore, sustainable management measures are necessary for B. costatum and should be integrated in reforestation policies to ensure its availability for its multiple uses in the coming years in Mali.
Le Centre pour la Communication Scientifique Directe - HAL - Diderot, Mar 13, 2019
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires
๏ 205 uses, mainly as medicine (73%) and food (20%), were documented ๏ TK varied as regards PD, g... more ๏ 205 uses, mainly as medicine (73%) and food (20%), were documented ๏ TK varied as regards PD, gender and sociolinguistic group. Informants from Bassila PD held highest knowledge, likewise men and Tchabè people did. ๏ High agreement on the use of WS among and across use-categories ๏ 5 WS including Aframomum alboviolaceum, Lippia multiflora, Monodora tenuifolia, Xylopia aethiopica, and Zanthoxylum zanthoxyloides were the most prioritized for conservation
African Crop Science Journal, 2020
The African baobab (Adansonia digitata L.) is a large tree of great socio-economic and cultural i... more The African baobab (Adansonia digitata L.) is a large tree of great socio-economic and cultural importance in Africa, with almost all the parts of the species used for various purposes. A major concern about baobab fruit pulp production is the long time it takes for first fruiting (about 15 years). Vegetative propagation offers several advantages with regard to consumers’ preferences and precociousness of fructification. The objective of this study was to synthesise existent knowledge related to vegetative propagation methods of baobab and examine future prospects for improving the species propagation. This will ultimately contribute to better integrate baobab-based agroforestry systems into the diversification and poverty alleviation programmes. It is clear that cutting, grafting and in vitro multiplication are the vegetative propagation methods already tested on baobab. The success of grafting methods ranges from 10 to 89%, depending on the technique used. The Murashige and Skoog ...
IECF 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
South African Journal of Botany
African Journal of Ecology, Jun 29, 2022
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Papers by Rodrigue Idohou