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Spatiotemporal Variation of Benthic Macroinvertebrates in Some Tropical Forest Streams of the Nyong Catchment (Cameroon)

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Open Journal of Applied Sciences 2022年第7期12卷 1210-1231页

作者： Jean Dzavi Samuel Foto Menbohan Blaise Rollinat Mboye Mathias Nwaha eric belmond biram à ngon Laboratory of Hydrobiology and Environment Faculty of Science University of Yaounde 1 Yaounde Cameroon Water and Climate Change Research Centre Institute of Geological and Mining Research Yaounde Cameroon Laboratory of Hydrobiology and Ichthyology Institute of Agronomic and Forestry Research Libreville Gabon

With the aim of assessing the benthic macroinvertebrates’ diversity, a study was carried out in some tropical forest streams of the Nyong River catchment in Cameroon from February 2019 to February 2020. A total of 167 samples were carried out from 13 stations during 13 months. Some environmental variables were measured. These parameters varied more or less from station to station but significantly at the temporal level. In this study, 13,690 benthic macroinvertebrates belonging to 4 phyla, 7 classes, 16 orders and 93 families were collected. The benthic macroinvertebrates were more abundant and more diversified in the stations whose waters are well oxygenated and present a moderate current compared to the stations with a very weak current. The diversity varied significantly from 1.33 ± 0.14 bits/ind to 2.00 ± 0.35 bits/ind and the high values were found in stations with multiple substrates and well-oxygenated waters. Temporally, the diversity varied significantly from 1.10 ± 0.16 bits/ind in NM sampling station in February 2020 to 1.87 ± 0.1 bits/ind in the OB sampling station in September. In addition, the settlement was more abundant during the short dry season, more precisely during the month of August (1471 individuals) but richer during the long dry season during the month of February (54 families). The distribution of the abundances of the benthic fauna in the different stations made it possible to identify five typological groups using the rarefaction curves, the ascending hierarchical classification and the principal component analyses. Each of these five groups is characterized by a specific taxonomic richness, composition and abundance.

关键词： Benthic Macroinvertebrates Environmental Variables Faunistic Diversity Taxonomic Richness Biotypology Tropical Forest Streams Cameroon

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Inventory and Distribution of Benthic Macroinvertebrates, Indicators of Water Quality in Four Forested Watercourses in Centre Region of Cameroon

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Open Journal of Ecology 2024年第4期14卷 381-394页

作者： eric B. biram à ngon Sylvie B. Chinche Josephine Ndjama Jean Dzavi Donald L. Nyame Mbia Mathias Nwaha Serge R. Gwos Nhiomock Blaise R. Mboye Ivone L. Tchaouapi Ulrich Tchouta Chamberline Ngalamou Samuel Foto Menbohan Research Centre for Water and Climate Change Institute of Geological and Mining Research Yaound&#233 Cameroon Department of Fisheries and Aquatic Resources Management Buea Cameroon Laboratory of Hydrobiology and Environment University of Yaound&#233 Yaound&#233 Cameroon Laboratory of Hydrobiology and Ichthyology Libreville Gabon

The inventory of benthic macroinvertebrate species was carried out in some streams of the Mefou catchment area, from August 2021 to August 2022, in order to determine the biological groups that make up the population and characterise these environments. The dataset acquired during this study made it possible to update the existing database and contribute to the knowledge of the biological groups associated in these environments, and to provide additional information on the existing ones in relation to bioindication. Overall 80 families were identified and, on the basis of frequencies of occurrence greater than 75%, 22 families were retained as potential biological indicators. The remarkable diversity of insects and the low abundance of Diptera reflect the low degradation of environments and the good quality of water. The high diversity indices obtained reflect the maintenance of the favourable ecological conditions that favours the development of a balanced and, integrated biological community capable of adapting to changes.

关键词： Benthic Macroinvertebrates Bioindicators Biological Quality Forest Watercourse Cameroon

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Inventory and Distribution of Benthic Macroinvertebrates, Indicators of Water Quality in Four Forested Watercourses in Centre Region of Cameroon

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Open Journal of Ecology（生态学期刊） 2024年第4期 381页

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Physico-Chemical and Biological Characteristics of the Nklobisson Artificial Lake in Yaounde, Cameroon

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Journal of Water Resource and Protection 2017年第12期9卷 1547-1563页

作者： Josephine Ndjama Gideon Aghaindum Ajeagah Ndondo Gustave Raoul Nkoue Wirmvem Mengnjo Jude ngon eric belmond birama Gloria Eneke Takem Eyong Andrew Ako Ako Mohamadou Bello Tchouya Romaric Victorien Ntchantcho Joseph Victor Hell Institute de Recherche Geo-miniere du Cameroun Yaounde Cameroun Laboratory of Hydrobiology and Environment Université de Yaoundé 1 Yaoundé 1 Cameroun Deparetement des Sciences de la terre Université de Douala Douala Cameroun

The deterioration of water quality in lakes constitutes an environmental problem faced by humanity. The Nkolbisson artificial lake which is located downstream of the Abiergue and Mintotomo streams in Yaounde is under the influence of various forms of pollution, mostly resulting from human activities. There is proliferation of algae on the lake surface that consumes the available oxygen in the lake. The main objective of the current study is to evaluate the different forms of pollutants in the lake, in order to propose efficient solutions for a suitable management strategy, basing on the physico-chemical and biological analysis. The lake retains an average of 2535.49 tons/year of suspended solids in the rainy season and 1438.05 tons/year in the dry season. The range of dissolved oxygen (5.2 - 3.8 mg/l);pH (7.8 - 6.8);temperature (23.9°C - 23.1°C);electrical conductivity (266.1 - 87.3 μS/cm);turbidity (22.3 - 10 UNT);suspended solid (240 - 40 mg/l);BOD (55 - 8 mg/l);COD (76 - 87.3 mg/l). Biologically, faecal coliforms fluctuates between (42 × 102 - 425 × 103 FCU/100 ml), faecal streptococci (8 × 103 - 158 × 103 FCU/100 ml) and total Coliform (15 × 103 - 78 × 106 FCU/100 ml) evidence that, the studied lake is highly polluted. Consequently the lake retains an average of 2888.7 tons/year of suspended matter.

关键词： Biological Physico-Chemical Pollution Artificial Lake Cameroon

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