Yves Bony - Academia.edu (original) (raw)

Papers by Yves Bony

International Journal of Innovation and Applied Studies, May 2, 2020

International Journal of Biological and Chemical Sciences, 2022

La lagune Aghien est une lagune périurbaine sujette à plusieurs types de pressions anthropiques. ... more La lagune Aghien est une lagune périurbaine sujette à plusieurs types de pressions anthropiques. Ces pressions pourraient avoir des répercussions sur les communautés biologiques qui peuvent être des indicateurs de l’état de qualité écologique de cette lagune. Parmi ces communautés biologiques, il y a les mollusques qui sont potentiellement capables de coloniser la zone profonde des systèmes lagunaires et lacustres. L’objectif de cette étude était d’évaluer l’état biologique du sédiment de la lagune Aghien à partir de l’Indice Malacologique de qualité des systèmes Lacustres (IMOL). Sur chaque station, l’échantillonnage du sédiment, a été réalisé en raison de trois échantillons de sédiments prélevés avec la benne Van Veen. Au total 10 taxons appartenant à 7 genres de mollusques ont été collectés dans le sédiment des différentes stations de la lagune Aghien. Selon l’IMOL, cinq stations sur les onze indiquent un état biologique moyen. L’état biologique du sédiment est connu et présente ...

African Journal of Ecology, 2012

In the present study, a first inventory of benthic macroinvertebrates in the Banco Stream, Côte d... more In the present study, a first inventory of benthic macroinvertebrates in the Banco Stream, Côte d'Ivoire, and the correlations between environmental variables and taxonomic richness were analysed. Seven stations were sampled monthly over a 1‐year period, using a hand net (10 × 10 cm, 250 μm mesh, 50 cm length). One hundred and thirty‐two macroinvertebrate taxa were recorded. These taxa were distributed among 74 families and 15 orders belonging to Insecta (118 taxa; 89% of total richness), Oligochaeta (seven taxa), Crustacea (five taxa) and Mollusca (two taxa). Kruskal–Wallis test revealed significant difference (at least P < 0.05) in macroinvertebrate richness between upstream stations (S1 and S2) and stations S4, S5 and S6. Chironominae and Tanypodinae (Insecta) were the two very frequent taxa in all the stations. Lumbriculidae (Oligochaeta), Desmocaris trispinosa (Crustacea) and Eurymetra sp. (Insecta) were frequently found in the samples. Hierarchical cluster analysis reve...

Evolution, 2011

In hermaphrodites, traits that influence the selfing rate can coevolve with inbreeding depression... more In hermaphrodites, traits that influence the selfing rate can coevolve with inbreeding depression, leading to the emergence of evolutionary syndromes. Theory predicts a negative correlation between inbreeding depression and selfing rate across species. This prediction has only been examined and validated in vascular plants. Furthermore, selfing rates are often influenced by environmental conditions (e.g., lack of mates or pollinators), and species are predicted to evolve mechanisms to buffer this variation.

Journal of Applied Biosciences

Objectives: Water, source of life is essential for all living beings. After its use, the water is... more Objectives: Water, source of life is essential for all living beings. After its use, the water is loaded in various elements modifying its physical, chemical and biological characteristics. One of the most serious environmental problems is the problem of sanitation. Indeed, human activity leads to the production of wastewater discharged daily into the wild. Methodology and results: Twenty-eight waste water samples were collected from eight Yamoussoukro lakes from sterile containers. The method of Bailenger was used for the detection of parasites. The specific recognition and enumeration of the parasites was done using an optical microscope Prevalences observed were compared between lakes and by parasite species. A total of 13 species of parasites: Ankylostoma sp., Strongyloïd sp., Ascaris sp., Nematodirus sp., Trichuris sp., Toxocara sp., Capillaria sp., Ascaridia galli, Enterobius vermicularis,Taenia sp., Hymenolepis diminuta., Entamoeba coli., Entamoeba histolytica et les larves de Strongles were detected in the waters of Yamoussoukro lakes. Helminth eggs are almost present in all investigated lakes with variable parasite loads. Three species gave very high parasite loads: The species Ankylostoma sp was found in all lakes. Strongyloids and Ascaris sp had prevalence rates of 100 % and 87.5 %, respectively. At the level of the parasite load of the lakes, Lake N ° 5 was the most parasitized with a prevalence of 100 % on all the parasites, then the lakes N ° 1, 6 and 8 (69,2 %) then the Lakes G0, 9 and 10 (53.8 %). Conclusion and application of results: Parasitological analysis show that Yamoussoukro lakes are contaminated by parasites of medical importance. The infestation of these waters with pathogens prohibits their use in agriculture, which is not commonly observed in the field.

Aquatic Science and Technology

Micralestes eburneensis Daget 1965, an endemic characin fish of Ivory Coast / Liberia is assessed... more Micralestes eburneensis Daget 1965, an endemic characin fish of Ivory Coast / Liberia is assessed as Near Threatened due to its restricted range. In addition, there is strong fishing pressure, habitat loss and aquatic pollution from clandestine gold mining in the Cavally River bed.Moreover, given the development and intensification of mining activities in the study area, it is to be expected that the population of the endemic species will continue to decline. The strong anthropogenic pressure in this region on the Cavally hydrosystem and its environment must be taken into account for a future update of M. eburneensis conservation status.There is an immediate need for developing protection and management actions for this fish species.

An inventory and the spatial distribution of the mollusks in the Agnéby Mé and Banco basins was s... more An inventory and the spatial distribution of the mollusks in the Agnéby Mé and Banco basins was studied. This survey revealed low molluscan biodiversity in the three basins. Eleven species belonging to eight genera and six families were identified. Their spatial distribution showed an absence of mollusks from the Banco basin and Miadzin high school area. The most common species in the Agnéby and Mé basins were the ubiquitous species Melanoides tuberculata, Physa marmorata, Bulinus forskalii and Lymnaea natalensis. Conductivity, pH, redox potential and aquatic plants appeared to be the main factors responsible for the spatial distribution of the species in the studied localities. Three invasive species, Physa marmorata, Indoplanorbis exustus and Melanoides tuberculata were reported. Several surveyed species in our basins were important intermediary host of parasites, particularly Planorbidae who constituted potential risk to public health.

Croatian Journal of Fisheries, 2015

The present study is focused on small coastal rivers in southeast Ivory Coast, aimed to predict s... more The present study is focused on small coastal rivers in southeast Ivory Coast, aimed to predict species richness of fish guilds and to test contribution of environmental variables for explaining guild structure with Self-Organizing Map (SOM) and Backpropagation (BP) algorithms. The former method was applied to pattern the samples based on the richness of six major fish guilds observed (benthivores, invertivores, detritivores, piscivores, herbivores and omnivores). Four clusters were identified: cluster I was characterised by benthivores, cluster II was distinguished by invertivores, detritivores, piscivores and omnivores, cluster III had high richness of benthivores, invertivores and herbivores, and cluster IV had high numbers of omnivore, detritivore and piscivore species. The BP showed high predictability (0.89 for benthivores, 0.85 for omnivores and Odonata, 0.84 for herbivores). There was high correlation between observed and estimated values for piscivores (0.77) and detritivores (0.72); the poorest fit was for invertivores (0.63). The frequency histogram of residuals showed that most residuals lie around zero for all guilds. The most contributing variables in predicting the six fish trophic guilds were water temperature, conductivity, total dissolved solids, dissolved oxygen, depth, width, canopy and distance from source. This underlines the crucial influence of both instream characteristics and riparian environment.

This study compares fish trophic structure in the river-lake system Bia to Agnéby river, a river ... more This study compares fish trophic structure in the river-lake system Bia to Agnéby river, a river with similar characteristics but have not impacted by the dam. Sampling sites were retained in upstream, the lake part and downstream areas of Bia river-lake system, and in upstream, middle stream and downstream of river Agneby. Samples were collected monthly during 23 surveys on each sampling zone with gillnets. A total of 78 and 45 fish species were recorded respectively in Bia and Agneby. Fish species were classified in nine trophic guilds using available information: Herbivore-microphage, Herbivore-phytoplanctonivore, Omnivore-benthophage, Omnivore-generalist, Omnivore-zooplanctonivore, Predator_1-insectivore, Predator_1-microphage, Predator_2generalist and Predator_2-piscivore. Predator_1-insectivore was most abundantly found in the rivers Bia and Agneby with respective percentage of 41.51 and 37.11. It is followed by Omnivore-generalist and Predator_2-generalist. Trophic guilds which are the most poorly represented are Herbivore-microphage (4.34%) and Predator_2-piscivore (3.97%) in Bia and Herbivore-microphage (0.62%) and Herbivore-phytoplanctonivore (2.89%) in Agneby. The analysis highlighted clearly two groups with no overlap in Bia river-lake system: samples from the lake and the upstream composed first group, and samples from the downstream are associated to second group. Two dominant guilds separating these two groups: Predator_2-generalist and Omnivore-generalist. The lake part and upstream are characterized by Omnivore-generalist, while Predator_2-generalist is mainly occurred in downstream. By contrast, samples from Agneby River couldn't reveal any difference between downstream, middle part and upstream. The presence of dam on Bia main channel impact trophic guild structure of fish fauna by inhibiting communication between upstream and downstream.

ABSTRACT We analysed aquatic insect distribution among four coastal river habitats of southeast I... more ABSTRACT We analysed aquatic insect distribution among four coastal river habitats of southeast Ivory Coast. In each river, two sites were sampled: one upstream and one downstream. In the eight sites, aquatic insects were randomly sampled eight times (i.e. four during the rainy season and four during the dry season) between July 2003 and March 2005. The basic criteria for classifying sampling sites by both the Principal Component Analysis and the hierarchical cluster analysis are mainly the nature of the waterbed substrate and the mineralization of the water. Overall, 115 taxa belonging to 51 families and ten orders were recorded. The richest taxon diversity was observed for Diptera and Ephemeroptera. The Indval method revealed that the most mineralized sites were characterised mostly by dipterans. However, the indicator taxa of weakly mineralized sites are mainly ephemeropterans. Taxa such as Laccophilus sp., Ablabesmyia sp., Ceratopogon sp., Cryptochironomus sp., Labiobaetis gambiae, Procloeon sylvicola and Nanocladius sp. were generalist in respect to the substrate nature. Riolus sp. Perla sp., Choroterpes sp., Cloeon sp. and Ephoron sp. were specialists of sandy substrate. Compsoneuria njalensis was characteristic habitats whose bottom is muddy.

Iranian Journal of Fisheries Sciences

ABSTRACT

This study investigated anaerobic co-digestion of cassava liquid waste (very acid and poor in nit... more This study investigated anaerobic co-digestion of cassava liquid waste (very acid and poor in nitrogen) and human urine. Three experimental digesters were used: manioc effluent; manioc effluent + urine; manioc effluent + urine + cow dung. All digesters have functioned with mesophilic temperatures between 24.0 and 35.6°C. Digesters without urine have a pH varying between 3 and 4 during experimentation. In reactors containing urine, the pH oscillated between 6.46 and 10.29. The COD/TKN ratios recorded in digesters buffered with human urine are lower than those observed in digester without human urine. Volume of gas produced by the two digesters containing human urine was significantly higher than that of the digester without urine. The additions of human urine and cow dung improve highly the methane potential during anaerobic co-digestion of manioc effluent. The flammability test is positive except for the digester without urine. Using human urine as a co-substrate for anaerobic digestion of cassava wastewater requires a large quantity of urine (40% in terms of proportion) for a best productivity. As well as allowing biogas production as a source of renewable energy, this system of co-digestion could help to resolve the sensitive problem of human excreta management in poor area. Indeed, human urine with an alkaline pH and richness in nitrogen can substitute chemicals commonly used to correct the pH during anaerobic biodigestion, in particular for the treatment of cassava wastewater which is very acid.

European Journal of Scientific Research

Agnébi is the most important river of littoral of Côte d'Ivoire. The first study of benthic m... more Agnébi is the most important river of littoral of Côte d'Ivoire. The first study of benthic macroinvertebrates of this river was studied in the middle stream (Pont Autoroute). This station was visited monthly during 10 months covering the 4 local rainy seasons. Ten (10) samples of the Ekman grab (an area of 0.225 m2) have been analyzed. Benthic macro fauna inventory showed for the whole river, 50 taxa distributed or divided: Oligochetes (2 taxa), Molluscs (14 taxa) and Insects (34 taxa). Five taxa are abundant (superior or equal of 5 % of total number) at Pont Autoroute: Potadoma liberiensis (37,3 %), Gabbiella africana (8,4 %), Cleopatra bulimoïdes (7,7 %), Mutela dubia (5,9 %) Chironomus spp (5,3 %). Specimen such as Ephemeroptera and Diptera Chironomidae are influenced by temperature and dissolved oxygen. High positive correlation has been established between snails and nitrate.

The aim of this study was to conduct a large-scale freshwater snail survey in Katiola to assess t... more The aim of this study was to conduct a large-scale freshwater snail survey in Katiola to assess the malacological diversity and the larval trematode infections. We conducted 156 samples of snails and environmental parameters in 13 sampling sites in 3 localities. Nine species were identified among the 6049 collected snails, with four of human schistosome transmitting snails, Bulinus forskalii, B. globosus, B. truncatus and Biomphalaria pfeifferi. Although B. pfeifferi was the most largely distributed and none of B. truncatus and B. forskalii were found naturally infected by schistosomes. B. globosus, B. pfeifferi and Lymnaea natalensis shed parasites with low prevalence (respectively 12.17%, 1.77% and 10.71%). Physico-chemical parameters showed low variations except dissolved oxygen. Four hydrophytes (Setaria longiseta, Ludwigia abyssinica, Polygonum salicifolium and Polygonum lanigerum) out of thirteen are ubiquitous and influenced the distribution of snails. Our data showed the pot...

Ecological conditions for the production fingerlings of Oreochromis niloticus (Linné, 1758) in as... more Ecological conditions for the production fingerlings of Oreochromis niloticus (Linné, 1758) in association with the rice WITA 12 ponds. Objective: Rice-Fish culture is a suitable system for rural poor people because of its contribution to food security, income generation and better nutrition for the farmer. In this study, the environmental parameters of the O. niloticus fingerlings production in association with rice production were investigated in Ivory Coast. Methodology and results: The experiment was carried from July to November 2010 with 32 000 larva of Oreochromis niloticus (1.28 ± 0.19 g ; 20 fish / m²) and 19 200 rice seedlings (Oriza sativa, WITA 12) transplanted at 20 cm x 20 cm spacing. Water physical parameters were equal in all treatment groups except dissolved oxygen, which had the highest values in fish only ponds. Nitrate and orthophosphate was higher in the fish ponds, while nitrite presence was low value in rice-fish treatment and the highest value of ammonia was ...

Journal of Chemical, Biological and Physical Sciences