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16S rRNA Gene-Based Metagenomic Analysis of Soil Bacterial Diversity in Brazzaville, Republic of the Congo

Advances in Microbiology 2023年第9期13卷 477-498页

作者： Irène Marie Cécile Mboukou Kimbatsa Itsouhou Ngô armel ibala zamba Faly armel Soloka Mabika Thantique Moutali Lingouangou Joseph Goma-Tchimbakala Etienne Nguimbi Laboratoire de Biologie Cellulaire et Moléculaire (BCM) Faculté des Sciences et Techniques Université Marien Ngouabi Brazzaville Republic of the Congo Unité de Recherche en Bioinformatique et Microbiologie Moléculaire Faculté des Sciences et Techniques Université Marien Ngouabi Brazzaville Republic of the Congo Institut National de Recherche en Sciences Exactes et Naturelles (IRSEN) Brazzaville Republic of the Congo

Soil contains a great diversity of microorganisms, among which are bacteria. This study aimed to explore bacterial diversity in soil samples in Brazzaville in the Republic of the Congo. Environmental DNA was extracted. The illumina MiSeq sequencing was held and the diversity indices have been computed. Illumina MiSeq sequencing revealed 21 Phyla, four of which were abundant: Proteobacteria, Acidobacteria, Actinobacteria and Bacteroidetes. Soil microbial communities in the studied samples were phylogenetically diverse but with a stable community structure. 17 classes are represented with relative abundances of Rihzobiales, Bacillales, Actinomycetales and Acidobacteriales. 40 families, the Alphaproteobacteria, the Bacilli and the 12 Actinobacteria. 83 orders among which the Rhizobiales are the most abundant followed by Bacillales and the least abundant followed by the Flavobacteriaceae. Of the 28 genera listed, the Bradyrhizobium is the most dominant in Mw3 and Mw4. 25 listed species, Bradyrhizobium, Bacillus, Actinoplanes, and Candidatu coribacter Acidobacterium are the most abundant species. The Shannon indices of Mw3 and Mw4 are equal, the H’max of Mw4 is greater than the H’max of Mw3. The Simpson index of Mw4 is equal to the Simpson index of Mw3, and the Pielou index (J) of Mw4 is less than the R of Mw3, but very close. This study opens interesting perspectives on the knowledge and exploitation of telluric bacteria in several areas of life.

关键词： Metagenomic Sequencing 16S rRNA Gene Soil Bacteria

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Diversity and Influence of Environmental Factors on the Spatio-Temporal Distribution of the Ichthyofauna of Malonda Lagoon (Congo Brazzaville)

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Natural Resources 2021年第5期12卷 147-163页

作者： Tenda Hélène Dembe Louvinguila armel ibala zamba Victor Mamonekene Lérège Batiabo Mikembi Freedom Honest Poaty Ngot Joseph Goma-Tchimbakala Ecole Nationale Supérieure d’Agronomie et de Foresterie (ENSAF) Université Marien Ngouabi Brazzaville République du Congo Institut national de Recherche en Sciences Exactes Naturelles Laboratoire de l’Environnement et Océanographie Brazzaville République du Congo

This study was initiated with the aim of studying the diversity and spatio-temporal distribution of fish in the Malonda lagoon, one of the coastal ecosystems of the Base Guinea in the Republic of Congo. The fish were sampled over a period of two years in three zones each including three stations known as: Mangrove, Grass and Full water. One station upstream towards the freshwater zone, one station downstream towards the mouth and one station in the containment zone. The catches were made using monofilament gillnets of 8, 10, 20 and 30 mm mesh size. During the rainy season, 1516 specimens belonging to 29 species, 17 families and 12 orders were collected. In the dry season, 768 specimens belonging to 20 species, 11 families and 8 orders were collected. For both seasons, the family Cichlidae is the most diversified. The marine forms are the most represented compared to the continental forms. Redundancy Analysis with forward selection coupled with Monte Carlo permutation tests showed that in the rainy season four variables influenced the distribution of species (Depth: 48%, Vase: 16%, Nitrogen: 10% and Transparency: 10%);in the dry season three variables influenced the distribution of species (Vase: 38%, Nitrogen: 14% and Oxygen: 11%). Ecological indices showed that the Malonda lagoon is already undergoing either anthropic or natural impacts, its state of ecological integrity is disturbed, the values of Shannon diversity and Equitability indices are not close to maximum values. The results of this study will serve as an ecological database for the proper management of these ecosystems.

关键词： Fish Ecology Distribution Season Malonda Lagoon Lower Guinea

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Length-Weight Relationships and Condition Factors of 15 Fish Species from the Loémé River Basin (Mayombe, Republic of Congo)

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Open Journal of Ecology 2023年第12期13卷 883-893页

作者： Honest Freedom Poaty Ngot Victor Mamonekene armel ibala zamba Leendert Van Den Berg César Ngoulou Dabney Matoko Kouediatouka Aulne Lérège Batiabo Mikembi Hélène Dembe Louvinguila Tenda Institut National de Recherche en Sciences Exactes et Naturelles IRSEN Brazzaville République du Congo Faculté de Sciences et Techniques (FST) Université Marien Ngouabi Brazzaville République du Congo Ecole Nationale Supérieure Agronomie et de Foresterie (ENSAF) Université Marien Ngouabi Brazzaville République du Congo Institut Nationale de Recherche Agronomique (IRA) Brazzaville République du Congo Groupe Van den Berg Project Management B.V. Utrecht Netherlands Centre National d’Inventaire et d’Aménagement des Ressources Forestières et Fauniques (CIARF) Brazzaville République du Congo

Length-weight relationships and condition factors are among the commonly used parameters to link the length of a fish to its weight. The present study was initiated to find out the growth patterns and overweight status of 15 fish species in the Loémé basin in Mayombe, Republic of Congo. In the period from February 2020 to September 2021, sampling was carried out in eight stations, following a standardised capture method using four gillnets of 10, 12, 15, and 25 mm mesh size and a hawk net of 1.90 m radius with 10 mm mesh size. Length-weight relationships were calculated according to P = aLSb and the condition factor, using K = (P/LSb)* 100. A total of 1153 specimens representing 15 species, 10 genera and 6 families were recorded. The number of specimens ranged from 10 to 214 for Chrysichthys auratus and Enteromius camptacanthus, respectively. The allometry coefficient b minimum of 2.697 for Chromidotilapiamelaniae and maximum of 3.589 for Garraornata, with a mean of 3.03 ± 0.2 is significantly not different from 3 at the 0.05 probability threshold and indicates isometric growth for almost all species, except for E. camptacanthus where b = 2.858 was statistically different from 3 at the same threshold. The positive and high values of the coefficients of determination r2 = 0.787-0.989 of the species, obtained during this study, suggest that weight increases with size in the fish of the Loémé basin. The average condition factor varies from 0.524 ± 0.064 for G. ornata to 4.917 ± 0.440 for C. melaniae.

关键词： Fish Growth Overweight Loémé River Basin Lower Guinea

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Anthropogenic Impacts on Fish Populations in Lake Cayo (Republic of Congo, Central Africa)

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Open Journal of Ecology 2020年第12期10卷 757-767页

作者： armel ibala zamba Magloire Boungou Tenda Hélène Dembe Louvinguila Victor Mamonekene Ronick Kombo Ephraim Kamba Gad Boukou Lérège Batiabo Mikembi Freedom Honest Poaty Ngot Parisse Akouango Laboratory of Animal Productions and Biodiversity ENSAF Marien Ngouabi University Brazzaville Republic of the Congo Laboratory of Research of Animal Biology and Ecology IRSEN Brazzaville Republic of the Congo Laboratory Animal Biology and Ecology Joseph University KI-Zerbo Ouagadougou Burkina Faso

Ichthyofaunal diversity and the impact of anthropogenic activities on fish population assemblages were studied in Lake Cayo, a small lake located in the coastal region of the Republic of Congo. Twelve stations were sampled twice over a two-year period. Fishing techniques following standardized methods utilizing monofilament gill nets, and nine environment variables were measured at each station. A total of 11,361 specimens comprising 30 species in 28 genera and 18 families were collected with the Cichlidae being the most diversified. Redundancy Analysis with forward selection coupled with Monte Carlo permutation tests identified depth, pH and substrate as accounting for 57.7% of the total variance among the nine variables sampled (p < 0.05). The low Shannon’s diversity (1.16 ± 0.33) and Equitability (0.43 ± 0.12) indices at all sites, suggest that the Lake Cayo system is in poor ecological health.

关键词： Fish Diversity Ecological Health Lake Cayo Lower Guinea

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16S rRNA Gene-Based Metagenomic Analysis of Soil Bacterial Diversity in Brazzaville,Republic of the Congo

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Advances in Microbiology（微生物学） 2023年第9期

作者： Irène Marie Cécile Mboukou Kimbatsa Itsouhou Ngô armel ibala zamba Faly armel Soloka Mabika Thantique Moutali Lingouangou Joseph Goma-Tchimbakala Etienne Nguimbi

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Length-Weight Relationships and Condition Factors of 15 Fish Species from the Loémé River Basin (Mayombe, Republic of Congo)

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Open Journal of Ecology（生态学期刊） 2023年第12期

作者： Honest Freedom Poaty Ngot Victor Mamonekene armel ibala zamba Leendert Van Den Berg César Ngoulou Dabney Matoko Kouediatouka Aulne Lérège Batiabo Mikembi Hélène Dembe Louvinguila Tenda

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