scholarly journals Simultaneous Effects of the Climate Change and the Recent Hydromorphological Modification of Vridi Channel (Côte d'Ivoire) on Some Its Hydrochemical Characteristics

2020 ◽  
pp. 82-97
Author(s):  
N'da Samuel ◽  
Yao Marcel Konan ◽  
Trokourey Albert
Keyword(s):  
Climate Change ◽  
Organic Matter ◽  
Redox Potential ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Benthic Fauna ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Climatic Regime ◽  
Annual Period

This work aims to assess the simultaneous effects of the climate change and the hydromorphological modification of Vridi channel on its hydrochemistry. To best estimate, this fact, the seasonal dynamic of the particle size distribution, pH, redox potential, salinity, conductivity, moisture and organic matter contents of Vridi channel sediments have been followed and compared during two different annual periods, where the climate and the hydromorphology of this estuary have been different. The first annual period, covering the period from April 2014 to March 2015, has been characterized by a climatic regime close to the climatic normal of the study area and, this channel had its former hydromorphology. The second period annual, covering the period from October 2018 to September 2019, has been marked by a disruption of the climatic regime throughout Côte d'Ivoire, and this channel presented its modified hydromorphology. A monthly sampling has been done in this channel during each annual period. All These physical and chemical parameters have been determined by the corresponding AFNOR standards. Results have shown that these superficial sediments, with a predominantly sandy texture over the period from April 2014 to March 2015, have presented a texture predominantly of silt and clays over the period from October 2018 to September 2019. The climate change and the recent hydromorphological modification of this ecosystem had simultaneous very few effects on their pH and redox potential over the study period. On the other hand, they have caused an important increase in their salinity, moisture and organic matter contents and, a decrease in their electrical conductivity over the period from October 2018 to September 2019 relative to those determined in these substrates over the period of April 2014 to March 2015. This fact has certainly affected its biodiversity, especially that of its benthic fauna.

scholarly journals Variabilite Des Extremes Pluviometriques Sur Le Bassin Versant De La Riviere Bia (Sud-Est, Cote d’Ivoire)

2018 ◽  
Vol 14 (2) ◽  
pp. 134
Author(s):  
Kouassi Kan Martin ◽  
Kouassi Kouakou Lazare ◽  
Yao Koffi Blaise ◽  
Meledje N'diaye Hermann ◽  
Biemi Jean ◽  
...  
Keyword(s):  
Climate Change ◽  
Trend Analysis ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Daily Rainfall ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Extreme Rain ◽  
Historical Database ◽  
Bassin Versant

Climate change is a reality which affects many climatic variables, including precipitation. The objective of this article is to study the extreme rain variability from a historical database (1941 - 2000). For this purpose, eleven (11) rainfall indices were calculated at the Adiaké, Bianouan, Ayamé, and Agnibilekro rainfall stations in Côte d'Ivoire. Due to lack of data on daily rainfall on the Ghanaian section of watershed, nine (9) monthly precipitations indices were estimated from monthly rainfall at the Enshi and Buakuc stations. The trend analysis of the precipitations indices show that a generalized downward was most significant in Adiaké compared to other stations. Furthermore, indices extreme thresholding (P99, P99p, P99,5 and P99,5p) have experienced a stable trend and a stationary evolution. All steps were detected in the non-stationary indices mostly observed after 1980 (late break) and before 1960 (precocious break).

scholarly journals Effets de six légumineuses spontanées les plus répandues dans les jachères naturelles sur la fertilité des sols dans la région de Daloa (Côte d’Ivoire)

2020 ◽  
Vol 14 (3) ◽  
pp. 1052-1064
Author(s):  
Nicaise Tetchi Akedrin ◽  
Bi Bianuvrin Noël Boué Voui ◽  
Odi Faustin Akotto ◽  
Sévérin Ake
Keyword(s):  
Organic Matter ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Agricultural Land ◽  
Physicochemical Characterization ◽  
Biological Properties ◽  
Cote D’Ivoire ◽  
Floristic Inventory ◽  
Côte D'ivoire

En Côte d’Ivoire, les pressions exercées sur les terres agricoles ont réduit la durée des jachères naturelles dominées par une végétation herbacée et dont la présence constitue une opportunité pour l’amélioration de la fertilité azotée des sols et la reconstitution minérale des sols dégradés. Pour cette étude, un inventaire floristique des légumineuses herbacées spontanées les plus répandues dans les jachères en constitution ont été effectuées suivie de la caractérisation physicochimique des échantillons du sol sous ces légumineuses ou non (témoin). Au total 6 espèces appartenant à deux familles (Fabaceae et Mimosaceae) et quatre genres (Calopogonium, Centrosema, Crotalaria et Pueraria) ont été inventoriées. Toutes ces espèces sont des Phanérophytes constitués majoritairement de lianes (83%) contre une minorité d’herbacées (17%). Le rapport C/N a varié de 09,5 à 12,8, demeurant ainsi dans la norme (9-12). Les sols prélevés sont quasi riches en matière organique (>1,30 g kg-1) à l’exception de celui recueilli sous Mimosa invisa (1,18±1,1g kg-1). La matière organique intervient dans les mécanismes de la libération de l’azote minéral, donc de la nutrition de la culture associée. Elle influe selon sa nature sur les propriétés physico-chimiques et biologiques du sol et a la capacité d’emmagasiner les réserves en eau.Mots clés : jachères naturelles, légumineuses subligneuses, inventaire, fertilisation, Côte d’Ivoire English title: Effects of six most common spontaneous legumes in natural fallows on soil fertility in the region of Daloa (Côte d’Ivoire)In Côte d'Ivoire, pressures on agricultural land have reduced the duration of natural fallows dominated by herbaceous vegetation and whose presence constitutes an opportunity for improving the nitrogen fertility of soils and the mineral replenishment of degraded soils. For this study, a floristic inventory of the most recurrent spontaneous herbaceous legumes colonizing these fallows in constitution was carried out followed by the physicochemical characterization of the soil samples under these legumes or not (control). A total of six species belonging to two families (Fabaceae and Mimosaceae) and four genera (Calopogonium, Centrosema, Crotalaria and Pueraria) were inventoried. All these species are Phanerophytes made up mainly of lianas (83%) against a minority of herbs (17%). The C / N ratio varied from 09.5 to 12.8, thus remaining within the norm (9-12). The soils sampled are almost rich in organic matter (> 1.30 g kg-1) with the exception of that collected under Mimosa invisa (1.18 ± 1.1 g kg-1). Organic matter is involved in the mechanisms of the release of mineral nitrogen, and therefore of the nutrition of the associated crop. Depending on its nature, it influences the physicochemical and biological properties of the soil and has the capacity to store water reserves.Keywords: Natural fallows, sublimers legumes, inventory, fertilization, Côte d’Ivoire.

Analysis of environmental risk factors for malaria under climate change in Korogho (North Cote d’Ivoire)

2016 ◽  
Vol 2016 (1) ◽  
Author(s):  
Kouassi Richard M'Bra* ◽  
Brama Koné ◽  
Ibrahima Sy ◽  
Jacques André N’Dione ◽  
Nagnin Soro ◽  
...  
Keyword(s):  
Climate Change ◽  
Risk Factors ◽  
Cote D'ivoire ◽  
Environmental Risk ◽  
Côte D’Ivoire ◽  
Environmental Risk Factors ◽  
Cote D’Ivoire ◽  
Côte D'ivoire

scholarly journals Climate Change and Its Impacts on Water Resources in the Bandama Basin, Côte D’ivoire

Hydrology ◽  
2017 ◽  
Vol 4 (1) ◽  
pp. 18 ◽  
Author(s):  
Gneneyougo Soro ◽  
Affoué Yao ◽  
Yao Kouame ◽  
Tié Bi
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Cote D’Ivoire ◽  
Côte D'ivoire

scholarly journals Primary Biodiversity Data Gaps Assessment and Data Use for Decision-making: A West African Experience

2019 ◽  
Vol 3 ◽  
Author(s):  
Benedictus Freeman ◽  
A. Townsend Peterson
Keyword(s):  
Climate Change ◽  
West Africa ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Ecological Niche Modeling ◽  
West African ◽  
Biodiversity Data ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Global Biodiversity

Primary biodiversity data, data documenting presences of particular species at particular sites at a point in time, available in standard digital formats, provide the basis for many quantitative studies that can inform effective and reliable national, regional, and global biodiversity conservation decisions. However, these datasets are often unavailable, incomplete, or unevenly distributed across regions and landscapes. We assessed the survey completeness and gaps in current knowledge of birds of West Africa, using digital, accessible primary biodiversity data, obtained from the Global Biodiversity Information Facility and eBird. Additionally, using ecological niche modeling approaches, we modeled the current and potential future geographic distributions of a diverse suite of range-restricted and ecologically important bird species, and used the resulting models to identify priority areas for conservation and future surveys (Fig. 1). The survey completeness and gap analyses revealed marked spatial, seasonal, and temporal (historical) gaps and biases in the coverage of bird records across the region (Fig. 1). Well-surveyed sites were clustered around points of access such as major cities, roads, and national reserves or parks, mainly in Ghana, The Gambia, Senegal, Côte d’Ivoire, and Cameroon (Fig. 1). For our distributional analysis, we found broad present-day potential distributions with respect to climate. Future potential distributions, taking into account climate change processes, tended to be still-broader and more inclusive than present-day distributions, so climate-change-driven range losses and gains were minimal. Our models identified Liberia, southeastern Sierra Leone, southwestern Côte d’Ivoire, and southwestern Ghana to have high climate suitability in the present and in the future for most species. These results illustrate the spatial and temporal biases and gaps in West African bird data, and emphasize the need to promote high-quality biodiversity data mobilization and publication in West Africa and by extension the developing world. To address these biases at the regional level, research institutions and individuals need to engage in more systematic planning and biodiversity research, taking into account the potential for spatial, temporal, and seasonal biases.

scholarly journals Fishermen’s perceptions and experiences toward the impact of climate change and anthropogenic activities on freshwater fish biodiversity in Côte d’Ivoire

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Amien Isaac Amoutchi ◽  
Thomas Mehner ◽  
Ogechi Nnabuchi Ugbor ◽  
Alpha Kargbo ◽  
Kouamelan Essetchi Paul
Keyword(s):  
Climate Change ◽  
Freshwater Fish ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Anthropogenic Activities ◽  
Freshwater Ecosystems ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Fish Biodiversity ◽  
The Impact

AbstractAfrica’s freshwater ecosystems are impacted by many threats due to climate change and several anthropogenic activities. In Côte d’Ivoire, the economy relies mostly on agriculture, which covers around 64% of the land surface. The study aimed to investigate Côte d’Ivoire fishermen’s perception of climate change, its drivers and other anthropogenic activities impacting freshwater fish biodiversity. The fish species locally threatened in the Ivorian freshwater ecosystems were also investigated. Face to face interviews and a structured questionnaire were used. The data obtained were analysed using descriptive statistics such as frequency, percentage, means, and standard deviation, minimum and maximum. The multinomial logit regression was also applied to test factors that influence fishermen’s awareness and perception of climate change and their perception of change in fish abundance. The results show that around 72.7% of fishermen were aware of climate change. Decreases of precipitation (87.9%) and increases of temperature (76.1%) were observed by fishermen. Also, a significant decrease in fish quantity was observed by respondents. Climate change and anthropogenic activities such as gold mining, water withdrawal, use of small-mesh fishing nets, overfishing, industrial waste pollution, pesticides use for agricultural purposes along watersheds, obnoxious fishing practices and population growth, were highlighted as the main reasons for this decline. Species such as Lates niloticus, Heterotis niloticus, Parachanna obscura, Malapterurus electricus, Sarotherodon galilaeus, Tilapia zillii, Polpyterus endlicheri and Labeo coubie were listed by fishermen as locally threatened within Ivorian freshwater ecosystems. Actions and policies are needed to be taken by local authorities to ensure the sustainability of fisheries resources. The information obtained from this study constitutes a prerequisite for developing and implementing studies or policies aimed at mitigating and combating the negative effect of climate change and anthropogenic activities on the Ivorian freshwater ecosystem.

scholarly journals Valorization of Agro-industrial Bio-waste from Seed Cotton in the Restoration of Degraded Soils in the District of Korhogo in Northern Côte d'Ivoire

2020 ◽  
pp. 1-10
Author(s):  
Alui Konan Alphonse ◽  
Yao Saraka Didier Martial ◽  
Oro Zokou Franck ◽  
Yao-Kouamé Albert
Keyword(s):  
Organic Matter ◽  
Grain Yield ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Organic Manure ◽  
Corn Yield ◽  
Control Soil ◽  
Seed Cotton ◽  
Cote D’Ivoire ◽  
Côte D'ivoire

The objective of this study was to restore degraded soils with organic manure from agro-industrial bio-waste (seed cotton) in the Department of Korhogo in Northern Côte d'Ivoire. The research plots were set up in a Fisher block experimental design with four treatments, namely T0 (control soil), T1 (bio-waste at 1 month of biodegradation), T2 (bio-waste at 3 months of degradation) and T3 (bio-waste at 6 months of degradation). On each of the treatments, bio-waste was applied using spreading technique and the variety F8128 of corn was sown to evaluate the agronomic performance of bio-waste. Four agronomic parameters were measured: Plant height, collar diameter, ear weight and grain yield. Likewise, the physical, physico-chemical and chemical analyses of the soil were performed before sowing and after corn harvesting. The work was carried out from 2018 to 2019 in the district of Korhogo in Northern Côte d'Ivoire. Our study shows significant increase in corn grain yield in each of the treatments (T1 = 2.26 T/ha; T2 = 1.98 T/ha and T3 = 1.48 T/ha) compared to the control (T0 = 1 T/ha). Laboratory analyses of the soil and bio-waste indicate a very low level of organic matter (MO varies from 0.55 to 0.77 g.kg-1) in the soil of the experimental plot and good mineralization of the organic matter in the bio-waste regardless of the decomposition time (C/N varies from 12 to 13). After application of the bio-waste, the organic matter content (T3 = 10.28 g.kg-1; T1 = 23.61 g.kg-1 and T2 = 23.63 g.kg-1) and nitrogen content (T3 = 0.69 g.kg-1; T1 = 1.16 g.kg-1 and T2 = 1.21 g.kg-1) of the various treatments significantly increased compared to the control soil (MO = 0.66 g.kg-1 and N = 0.013 g.kg-1). The pH level increased where the organic manure was applied becoming slightly acidic (5.7 to 6.4) compared to the control that had strong acidic reaction (4.8 to 5.1).  Based on our study, it is evident that organic fertilizer has positive effect on corn yield. The seed cotton bio-waste has had an improving effect on the degraded soil of in Northern Côte d’Ivoire.

Hydrolysable carbohydrate in tropical soils under adjacent forest and savanna vegetation in Lamto, Côte d'Ivoire

Soil Research ◽  
2005 ◽  
Vol 43 (6) ◽  
pp. 705 ◽  
Author(s):  
Hassan Bismarck Nacro ◽  
Marie Christine Larré-Larrouy ◽  
Christian Feller ◽  
Luc Abbadie
Keyword(s):  
Organic Matter ◽  
Forest Soils ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Mineral Nutrient ◽  
Microbial Activities ◽  
Cote D’Ivoire ◽  
Rapid Decomposition ◽  
Côte D'ivoire ◽  
Savanna Soils

Carbohydrates represent 5–25% of the organic matter in soils. They constrain microbial activities and mineral nutrient production in soil and also reflect the whole microorganism community dynamic. The objective of this study was to determine the contents and composition of hydrolysable carbohydrates in soils collected in a forest–savanna mosaic landscape in the region of Lamto (Côte d’Ivoire). Capillary gas chromatography was used to identify and determine carbohydrates in soil profile under 4 tropical ecosystems: gallery and plateau forests, and grass and shrub tree savannas. Forest soils were higher in organic matter than savanna soils (0.50–2.96% C v. 0.53–1.22% C). The carbohydrate-C content of soils, expressed as percentage of total soil organic C, was low, a likely consequence of the tropical climate that promotes a rapid decomposition of surface plant debris. The carbohydrate-C content was higher under savanna soils (5–7%) than under forest soils (3–4%). Glucose, ribose, mannose, xylose, and galactose were the 5 most abundant extractable monosaccharides in all soils. Between them, only xylose and ribose are controlled by the vegetation type. The [(galactose + mannose) : (arabinose + xylose)] and [mannose : xylose] ratios suggested that most soil sugars derive from microbial biomass. The large abundance of microbial carbohydrates indicates intense microbial activities in the soil, and then rapid decomposition of soil organic matter favoured by the long wet season, with high temperatures and soil water availability at the site study. Results suggest clearly that the climate likely controls the amount and composition of carbohydrates in Lamto soils.

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