Zebaze T Serge

• Doctor of Philosophy
• Professor at University of Yaoundé I

L’objectif du présent travail a été d’évaluer le rendement épuratoire de quelques stations d’épuration (STEP) en bon état de fonctionnement ou non afin de ressortir l’impact de leur rejet sur leurs cours d’eau récepteurs à partir des rabattements des densités microbiennes. A cet effet, les concentrations bactériennes isolées des eaux usées ont été...

A study of the community dynamics of benthic macroinvertebrates in relation to physicochemical water quality was conducted from December 2022 to December 2023 in the Lepp-Nyock, Ndog-Bissolo, and Ngwei streams within the tropical littoral forest area of the Guinean Gulf (Edéa). Physicochemical analyses were performed and Benthic Macroinvertebrate i...

Water quality assessment in freshwater ecosystems is crucial for understanding their health and ensuring safe water use for various domestic purposes. This study on Lake Kivu highlights the significance of physicochemical parameters in evaluating quality dynamics by the water quality index (WQI). The sampling for physicochemical characterization, i...

Despite international recognition of the Lake Nokoué classified as a Ramsar site 1018 in 2000, this Lake is still not spared from environmental pressures, mainly of anthropogenic origin, including eutrophication. This study aims to assess the dynamics of its trophic state. A total of 180 water samples were taken at 10 stations during six campaigns...

Background Urbanization coupled with poverty has promoted the exploitation of risk zones like flood-prone areas in the city of Yaoundé. The overcrowding and poor hygiene observed in these areas are responsible for the unsmiling variations in environmental cleanliness, exploitation of river water for domestic purposes thus putting them at risk for p...

Introduction: Hospital effluents are one of the main sources of dissemination of pharmaceutical residues in hydro system. Worldwide, analyses of these effluents have revealed the presence of various pharmaceuticals. Very few studies assessing the contamination of solid matrices by pharmaceutical residues have been carried out in Africa, specificall...

The aim of the present study was to examine the zooplanktonic prey preferences of two important artisanal fish species, Ethmalosa fimbriata (Clupeidae) and the Eucinostomus melanopterus (Gerreidae) in Lake Nokoué. A monthly sampling was conducted from September 2021 to January 2022, and the stomach contents of the sampled fish were analyzed using p...

Pyriforce 600 EC and Cyperplant 100 EC are insecticides used in large quantities in agricultural practices in Cameroon. Residues due to intensive agriculture combined with surface runoff and surface drainage, a few weeks after application are deposited in water courses like ponds, rivers and lakes. This has negative effects on fish and other aquati...

Antibiotic resistance has become a global concern, mainly in developing countries, due to the socio-economic and health issues. This work aims to test the antibiotic susceptibility of germs isolated from well water consumed in the city of Moundou. This study was carried out during the period from May 2019 to July 2020 covering the two seasons of Ch...

The present study was carried out to assess the effect of water quality on survival and weight of tank-raised Clarias gariepinus fed with commercial and farm-made feeds. Nine hundred juveniles (15.15± 3.48g; 128.366± 9.67mm) were stocked in 09 IBC (Intermediate Bulk Container) tanks (1m 3 141 each) at a density of 100 fish/tank and fed with importe...

Cette étude visait à évaluer la sensibilité ou la résistance Salmonella typhi et Shigella sp isolés du bassin versant du cours d'eau Olézoa a quelques antibiotiques. Des échantillons d'eaux ont été prélevés à différents points sur le cours d'eau Olézoa (cinq points) et également dans des puits (cinq) qui longent ce cours d'eau. Les résistances aux...

We evaluated the impact of altitude on the biodiversity and water quality of 13 springs located from 82 to 1,189 m a.s.l. on Mount Cameroon. The springs were of good chemical and ecological quality whatever the altitude. The analysis of the physicochemical variables showed low temperature levels (19.50 ± 2.09 °C), high turbidity (13.0 ± 7.17 FTU),...

The aim of this study was to assess histopathological alterations in the gills, skin, liver, and kidneys of the African catfish (Clarias gariepinus) fed with industrially manufactured extruded (Le), locally pelleted (Lpe) and locally extruded (Lex) feeds and reared in intermediate bulk containers (IBC) tanks. Nine hundred juveniles (15.15±3.48 g; 1...

Maroua, the capital of Far North Cameroon, is frequently affected by outbreaks of waterborne diseases. Waters stored in public clay pots are common in the city and are provided voluntarily by individuals for drinking and ablution. Yet, such service through the clay pots and the stored water lacks management and surveillance. If contaminated, such w...

There has been a renewed interest for larviciding during the recent decade. Although biological larvicides are considered not to be harmful to non-target organisms, there is still not sufficient data on the effect of new long-lasting larvicide formulations such as VectoMax G combining Bacillus thuringiensis israelensis and Lysinibacullus sphaericus...

This study was conducted to assess the physico-chemical parameters of soils and the distribution of resistance forms of soil-transmitted helminths and protozoa in the land surrounding the Okole and Lebomo streams in Bokito. The sedimentation and the Faust technics were used to identify and count the resistance forms of intestinal parasites. Among t...

A research to study the zooplanktonic population in relation to some abiotic variables of the Kribian coast waters was conducted from July to December 2020 following a monthly sampling in six (6) selected sites. The physicochemical parameters were determining out using standard methods. Concerning the zooplankton, the water was collected at the sur...

This book gives positive examples how humans and rivers have been, and are still in some places, living in harmony. It analyses how this knowledge can be transferred into modern river management schemes and thereby it attempts to mitigate the deplorable trend of the decline of biological and cultural heritages and diversities in and along rivers. A...

One of the major challenges of aquatic ecology is to understand how anthropization affects biodiversity and what the consequences on the functioning of hydrosystems. Physicochemical and zoolanktonic variables studied in two ponds (Mokolo and Mopa) in the city of Bertoua, with two sampling stations (surface and depth) per pond and data collected mon...

In Cameroon, rivers are subjected to physicochemical disturbances, which increase the degradation of water quality. The aim of this study was to determine the spatio-temporal diversity of the phytoplankton groups and to evaluate the environmental parameters of the sampling sites in order to assess the quality of water in two hydrographic networks....

Aims: Intestinal parasitic infections are persistent in Africa, and we questioned here whether prevention measures imposed by the occurrence of the COVID-19 pandemic in 2020 could alleviate this threat in lowlands of the city of Yaoundé, Cameroon. Study Design: We monitored the trend of intestinal parasites in human and environmental samples from t...

Intestinal parasite infections are still prevalent in developing countries and in Cameroon where over 90% of the population is at high risk. To assess the distribution of intestinal parasitic infections and risk factors of the city of Yaoundé, both household and parasitological surveys were conducted from October to December 2019 among inhabitants...

Maroua, the capital of Far North Cameroon, is frequently affected by outbreaks of waterborne diseases. Waters stored through public clay pots are common in the city and provided voluntarily by individuals for drinking and ablution. Yet, such service through the clay pots and the stored water lacks management and surveillance. If contaminated, such...

During recent investigations of the groundwater fauna of Cameroon, specimens of a new species of the stygobitic genus Metastenasellus , M. boutini sp. nov. were collected in wells of the city of Douala. The new species can be easily distinguished from the other species of the genus by its relatively large size (up to 11 mm), pleonite 1 and 2 half t...

This work was conducted with the aim of studying the biodiversity of benthic macroinvertebrates in the Dja River and determining the effect of the Mekin hydroelectric dam on their population in relation to the physico-chemical quality of the water. The study ran from May to October 2020 and samplings were carried out on a monthly basis in four diff...

This study were carried out from May 2019 to July 2020 with the aimed of evaluating the physicochemical and bacteriological quality of well water in the City of Moundou (Chad). The physicochemical analysis showed that, the water from wells in the two sub-divisions were of very poor quality with an average concentration in Suspended Solids (SS) 30.7...

655929110; Yaoundé's anarchic urbanism has resulted in an increase in the rate of household waste, creating a favourable environment for the development of intestinal parasites, posing a significant public health problem. The purpose of this research is to determine the impact of household refuse collection points on the spread of parasite resistan...

In this study we evaluate the reliability of the Regional Climate Model (RegCM4.6) by performing several sensitivity tests at 50 km horizontal resolution using 10 convection schemes or combination of convection schemes. Emphasis on model output is made for the September–October–November 2017–2019 seasonal period. Part of the Central African region,...

In order to understand the potential impact of abiotic factors on the dynamics of bacterial abundance and diversity of the groundwater fauna in Cameroon, a study was carried out in 10 wells in the town of Mbalmayo. In each well, twelve samples were taken at monthly intervals. Analyses were carried out according to standard protocols. The results of...

Whilst several studies have dealt with the effects of domestic, municipal and industrial pollution on river biodiversity in Cameroon, very little data is available on the impact of bridge construction works on this biodiversity. To fill these gaps in our knowledge, we collected macroinvertebrates of two forest streams between January to June 2020,...

This study aims to improve the understanding of algal community’s dynamics in response to different environmental factors in two dam ponds (Mokolo and Mopa) in the city of Bertoua (East-Cameroon). Physicochemical and biological analyzes were carried out monthly by direct sampling at the surface and using Van Dorn bottle at 1 m depth. The organisms...

The biological assessment of the Mayo Kaliao River was carried out from 2013 to 2014 using macroinvertebrates. The bioevaluation attributes were FFGs, P/R index, Channel Stability, Temperature, HBI, percentage of tolerant taxa and percentage of intolerant taxa to organic pollution. Channel stability revealed that, from the beginning of water flow u...

Bioindicators of running freshwaters in Central African Republic : benthic macroinvertebrates and anthropogenic stress in the Nguitto Stream. This study of benthic macroinvertebrates in Central African Republic (CAR) aimed at determining the structure of their assemblages in relation to the physico-chemical quality of the Nguitto River. The data we...

This second study of benthic macroinvertebrates in Central African Republic (CAR) aimed at determining the structure of their assemblages in relation to the physico-chemical quality of the Nguitto River. The data were collected monthly from May 2015 to April 2016, in five selected sampling points on the Nguitto River. The physico-chemical parameter...

In order to contribute to the improvement the production of fry through larval feeding, a study on the effect of doses of chicken manure on the structure and dynamic of zooplankton was realized in 9 ponds (5.7 x 5.7 x 1 m) at a flow rate of 0.05 l/s. It was carried out from May to November 2016 at the Farm of Application and Research of the Univers...

Cette étude a pour objectif d'évaluer la contamination par Salmonella sp. et Vibrio cholerae des eaux de puits consommées dans la ville de Garoua, dans l'optique de prévenir les maladies hydriques causées par ces germes. Des échantillons d'eau ont été collectés, selon une fréquence mensuelle pendant 10 mois, de 23 puits représentatifs de la région...

A study has been carried out on the rivers of the Centre-south forest region of Cameroon in the inter-tropical area of Central Africa. The aim was to determine the variability of the rivers' physicochemical state of this area and then to test the aptitude of IPO and SEQ-Eau to rigorously qualify the natural water of this area. Fourteen sampling sta...

The present study was aimed to study the diversity of aquatic macroinvertebrate populations in relation to the abiotic parameters of the Sô River. For this purpose, aquatic macroinvertebrates were sampled monthly between February 2016 and April 2017 on 12 sampling stations and in various habitats along the Sô River. Similarly, twenty environmental...

A study was conducted from Health Laboratory (NCBPHL) in Bangui, Central Africa Republic (CAR), on cerebrospinal fluid (CSF) coming from town's hospitals. This study aims to assess the prevalence of Streptococcus pneumoniae strains of and their profile of resistance to antibiotics in CSF. The CSF was collected from patients admitted to the Bangui t...

The aim of this study carried out in Mayo Tsanaga River was to determine the major indices which are more appropriate to characterize ephemeral stream in Sudano-Sahelian zone. Despite the influence of human activities in watershed physicochemical characteristics did not reveal a poor quality of water due to organic pollution. But the HBI values, th...

In the harbor city of Douala, urban land use has increased dramatically over years, resulting in high variability in aquatic ecosystems. In this study, we used benthic macro-invertebrates community structure to assess the impact of urban pollution on the aquatic health of an urban stream in Douala township. Samples were done monthly, from April 201...

p>The specific composition and structure of zooplankton in two fish ponds (one being natural E1 and the other man-made E2) in Simbock, Yaoundé, was studied in relation to some physico-chemical variables, between April and December 2007. Physico-chemical parameters were measured according to the techniques described by APHA (1985). Biological analys...

p>The specific composition and structure of zooplankton in two fish ponds (one being natural E1 and the other man-made E2) in Simbock, Yaoundé, was studied in relation to some physico-chemical variables, between April and December 2007. Physico-chemical parameters were measured according to the techniques described by APHA (1985). Biological analys...

The present study, conducted between May 2012 and September 2013, aimed to determine the distribution of groundwater invertebrates in the Bamoun tableland, Cameroon. A total of 216 samples taken from 30 wells in four localities - Foumban, Foumbot, Kouoptamo and Magba - contained 80 invertebrate taxa belonging to Crustacea, Oligochaeta, Arachnida, I...

The continental Africa, which represents 10% of the total amount of world’s freshwater, is also one of the least-studied regions of the world with regard to crustaceans. Moreover, studies of freshwater fauna in Africa focused mainly on arid and semi areas in Northern, Eastern, and Southern Africa whereas Western and Central Africa, that concentrate...

A study was carried out from January to December 2012 in the National Clinical Biology and Health Laboratory (NCBPHL) of Bangui on 171 samples of cerebrospinal fluid (CSF) coming from CAR's hospitals. This study aims to assess the performance of a simultaneous detection method of Neisseria meningitidis, Streptococcus pneumonia and Haemophilus in...

Groundwater serves as a major source of drinking water in North Cameroon. Water quality is an important determinant of human health, considering in particular waterborne diseases in local communities. This study aimed at assessing the bacteriological quality and potential sources of well water contamination in Garoua, a metropolis of North Cameroon...

Objectif : Une étude visant à déterminer la distribution spatio-temporelle du zooplancton en relation avec les variables environnementales du ruisseau Kondi, cours d’eau du réseau hydrographique du Wouri qui arrose Douala, ville portuaire et métropole économique du Cameroun a été menée d’avril 2011 à mai 2012.Méthodologie et résultats : Trois sites...

Une étude visant la mise sur pied d'un indice d'intégrité biotique basé sur les Macroinvertébrés benthiques a été conduite dans la région du centre sud forestier du Cameroun. Les analyses spatiotemporelles de la richesse taxonomique, du nombre de taxons EPT (Ephéméroptères, Plécoptères, Trichoptères), du pourcentage de taxons EPT, du pourcentage de...

The ability of strains of faecal bacteria (Vibrio cholerae, Escherichia coli ATCC 25922, and four strains of Salmonella isolated, resp., from well water, pig, poultry, and human urine in Garoua) to survive or grow in well water microcosms was compared. Water samples were obtained from two wells in Garoua (north Cameroun). Autoclaving at 121°C for 1...

In this study a checklist of the stygobiotic crustaceans specifically for Africa is provided for the first time. Several nomenclatorial and taxonomic changes, as well as many new species or localities, have been included in the list since the publication of Stygofauna Mundi (Botosaneanu, 1986), which deeply modifies our knowledge on the biogeograph...

Cette étude a pour objectif d’établir la liste faunistique des crustacés aquatiques souterrains d’Afrique et de Madagascar actuellement connus, dans les différents types d’habitat où ils ont été récoltés. Cette liste comporte 280 espèces appartenant à 9 ordres, 32 familles et 103 genres différents. Ce travail met en évidence le manque criant de con...

Cette étude a pour objectif d’établir la liste faunistique des crustacés aquatiques souterrains d’Afrique et de Madagascar actuellement connus, dans les différents types d’habitat où ils ont été récoltés. Cette liste comporte 280 espèces appartenant à 9 ordres, 32 familles et 103 genres différents. Ce travail met en évidence le manque criant de con...

Sont considérés dans cette étude, l’impact des rejets polluants d’origines urbaine et industrielle sur la qualité des eaux du Mfoundi, l’abondance, la richesse spécifique et la structure des communautés diatomiques qui peuplent ce cours d’eau. Le calcul du pourcentage de taxons tolérants à la pollution organique a permis d’évaluer la réponse de ces...

The composition and the structure of the zooplankton of two lakes of the Ossa lake complex (Ossa and Mwembe) were studied between September 2009 and February 2010. 37 and 41 species of zooplankton were inventoried respectively in the lakes Ossa and Mwembe. The two environments are oligotrophic but subjected to the influence of the river Sanaga that...

The paper demonstrates the influence of physico-chemical parameters on the distribution of endocommensal ciliates through the gut of the earthworm Alma emini. We measured physico-chemical parameters of the intestinal liquid extracted with the vacuum aspiration technique and concomitantly recorded biological parameter (species abundance). Furthermor...

In the present study, six species of Vibrio that are potential human pathogens have been isolated from surface water resources in an urban environment and have been identified. The variation of some physico-chemical factors known to have significant effects on bacterial growth and spread are also considered. The latter include: electrical conductiv...

Urban malaria is becoming a major health priority across Africa. A study was undertaken to assess the importance of urban pollution and agriculture practice on the distribution and susceptibility to insecticide of malaria vectors in the two main cities in Cameroon. Anopheline larval breeding sites were surveyed and water samples analysed monthly fr...

A study carried out in the Biyeme stream, a tributary of the Mfoundi mainstream aimed in assessing the water quality of the stream by applying benthic macro-invertebrates. For a total of 970 individuals harvested, 28 benthic macro-invertebrate families were identified, giving a total of 18 families of arthropodes (71.5%), 5 families of Mollusca (15...

A laboratory study has been carried out to assess the retention capacity of Streptococcus faecalis and Escherichia coli by two ferralitic soil horizons: the upper soil horizon (H A ), linked to the soil surface and of sandy-clayed texture, and the deeper soil horizon (H Q ), related to the groundwater table and of quartzo-feldspathic texture. Bacte...