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Zooplankton Dynamics of the Kienke Estuary (Kribi, South Region of Cameroon): Importance of Physico-Chemical Parameters

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Open Journal of Ecology 2021年第12期11卷 837-869页

作者： Essomba Biloa Rachel Eliane Noah Ewoti Olive Vivien Tuekam Kayo Raoul Polycarpe Sob Nangou Paul Bertrand Tchakounté Siméon Onana Fils Mamert nyamsi tchatcho nectaire lié Zebaze Togouet Serge Hubert Institute of Fisheries and Aquatic Sciences of Yabassi University of Douala Douala Cameroon Laboratory of Hydrobiology and Environment Faculty of Science University of Yaounde 1 Yaounde Cameroon Laboratory of Microbiology Department of Biological Science Faculty of Science University of Bamenda Bamenda Cameroon

All Cameroonian estuarine systems, like the Kienke estuarine system (urban area of the port city of Kribi), are considered, as everywhere in the world, as unstable and vulnerable coastal ecosystems insofar as they are influenced by anthropogenic activities (port facilities, industrial facilities), without forgetting climate change. The present work was initiated in order to assess the influence of the seasonal evolution of physico-chemical parameters on the dynamics of zooplankton in the estuarine system of the Kienke. A study to assess the influence of seasonal evolution of some physico-chemical parameters on Zooplankton population dynamics was conducted from June 2016 to August 2017 in the Kienke estuarine system (Kribi, South Cameroon Region). Samples were collected in five (05) sampling points at the lower stream, at the confluence and then at 100 meters from the bank at sea following a monthly frequency. The Kienke estuary was characterized by spatio-temporal variations of physico-chemical parameters. These parameters are high temperature, relatively high electrical conductivity and salinity, and a relatively basic hydrogen potential (pH). Nutrients (ammonia nitrogen, nitrates and orthophosphates) were relatively low in the Kienke estuary. The organic pollution index (OPI) indicated moderate to high water pollution. At the surface and at depth, during the long dry season (December to February), Zooplankton densities were very low in the Kienke estuarine system. But rather high during the main rainy season (August to October). The results show that 105 species of Zooplankton belonging to 46 families grouped into four orders were identified. At the surface, 52 species of Zooplankton belonging to 23 families and 4 orders were identified, while at depth, 53 species of Zooplankton belonging to 23 families were also identified. The most abundant group was the Copepods represented by the following species: Tropocyclops confinis Kiefer, 1930;Mesocyclops

关键词： Dynamics Kienke Estuary Kribi Physico-Chemical Zooplankton

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Effects of Industrial Agriculture and Urbanization on Structure and Functional Organization of Macroinvertebrate of Coastal Streams in Cameroon

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Journal of Water Resource and Protection 2021年第2期13卷 154-171页

作者： Fils Mamert Onana Antoine Arfao Tamsa Siméon Tchakonte Ernest Koji nectaire lié nyamsi tchatcho Yannick Nkouefuth Nfongmo Serge Hubet Zebaze Togouet Department of Aquatic Ecosystems Management Institute of Fisheries and Aquatic Sciences University of Douala Douala Cameroun Department of Animal Biology and Physiology Faculty of Science University of Yaoundé I Yaoundé Cameroon Microbiology and Biotechnology Laboratory Saint Jerome Polytechnic Institute Saint Jerome Catholic University of Douala Douala Cameroon Department of Animal Biology and Physiology Faculty of Sciences University of Douala Douala Cameroon

The impact of land use changes on watercourses is poorly documented in Cameroon. Therefore, this study examines the effects of agriculture and urbanization on water quality, the structure and functional organization of macroinvertebrates of streams in the coastal zone of Cameroon. Nine sampling stations including three per catchment area with different land occupations (agricultural, urban and forest) were selected. Benthic macroinvertebrates were sampled monthly from February to July 2018 and the physicochemical variables were measured simultaneously. The urban and agricultural streams showed highly polluted waters with high nutrient and suspended matter content, whereas the forest stream waters are moderately polluted. In addition, the hierarchical ascending classification indicated a proximity in water quality between the agricultural and forest streams for which the main physicochemical variables did not vary significantly. With regards to macroinvertebrates, the forest watercourse is characterized by the proliferation of pollution-sensitive taxa, high diversity indices and complex trophic structuring, indicating its good ecological status. In contrast the urban watercourse, heavily polluted is characterized by low diversity indices reflecting a simplification of the structure of stands dominated by the pollution-tolerant collector-gatherer stands. The majority of biological indices and functional feeding groups were not significantly different between the agricultural and forest streams, suggesting a less pronounced impact of agriculture on macroinvertebrates. Our results showed that, riparian vegetation even though constituted of perennial crops, reduces the effects of agricultural inputs on streams and promotes the establishment of diversified macroinvertebrate communities.

关键词： Industrial Agriculture Urbanization Macroinvertebrates Water Quality Riparian Vegetation Perennial Crops

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Phytoplankton Dynamics of Mokolo and Mopa Ponds in Bertoua City (East-Cameroon)

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Open Journal of Ecology 2020年第7期10卷 482-496页

作者： Janvier Kengne Tenkeu Gwladys Joelle Mogue Kamdem nectaire lie nyamsi tchatcho Narcisse Mvondo Isabelle Appoline Kalieu Wilfried Takam Serge Hubert Zebaze Togouet Laboratory of General Biology Faculty of Science University of Yaounde I Yaounde Cameroon Department of Aquatic Ecosystems Management Institute of Fisheries Science of Yabassi University of Douala Douala Cameroon

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 were collected using transparent glass vials of about 500 ml and fixed with 2.5 ml of a lugol solution, then analyzed using the Utermôhl method. Physicochemical analyzes show low transparency (75 cm) of the ponds despite their shallow depth (≤150 cm), high levels of dissolved oxygen (>60%), BOD5 (>30 mg/L) and chlorophyll “a” (>30 μg/L). These data made it possible to categorize the Mokolo and Mopa ponds as hypereutrophic with nitrogen as the limiting factor for eutrophication. Biological data show quite diversified ponds with 138 species identified in Mokolo Pond and strongly dominated by Diatoms with 2951 ind. representing 46% of the total abundance. In Mopa Pond, 147 species were identified, mainly represented by Chlorophyceae with 3629 ind. representing 52% of the total abundance. Azpeitia africana

关键词： Bertoua Dynamics Hypereutrophic Phytoplankton Ponds

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Comparing Freshwater Benthic Macroinvertebrate Communities in Forest and Urban Streams of the Coastal Ecological Region of Cameroon

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Open Journal of Ecology 2019年第12期9卷 521-537页

作者： Fils Mamert Onana Serge Hubert Zebaze Togouet Antoine Arfao Tamsa nectaire lié nyamsi tchatcho Siméon Tchakonte Ernest Koji Armel William Yemtsa Yemeli Abigaelle Natacha Sandrine Mouto Makong Department of Aquatic Ecosystems Management Institute of Fisheries and Aquatic Sciences University of Douala Douala Cameroon Department of Animal Biology and Physiology Faculty of Science University of Yaoundé I Yaoundé Cameroon Microbiology and Biotechnology Laboratory Saint Jerome Polytechnic Institute Saint Jerome Catholic University of Douala Douala Cameroon Department of Animal Biology and Physiology Faculty of Sciences University of Douala Douala Cameroon

In this study conducted in the coastal zone of Cameroon, biological indices and functional feeding groups of benthic macroinvertebrates were used to assess the health status of two urban streams. For a better diagnosis, two streams located in coastal forest zone were used as a reference. Benthic macroinvertebrates were sampled monthly over a 3-month period (from May to July 2017) in six urban stations and six forest stations. Measurements of the physicochemical variables were done simultaneously. Physicochemical analysis revealed that urban streams are strongly polluted with high content of decaying organic matters, while forest streams are slightly polluted as indicated by the Principal Component Analysis. Concerning benthic macroinvertebrates, urban streams are poorly diversified with the proliferation of taxa tolerant to water pollution and belonging to the functional feeding groups of collectors-gatherers. Inversely, forest streams are more diversified and dominated by sensitive taxa, most belonging to the functional feeding groups of predators and shredders. These marked differences between biological indices and feeding mode of benthic macroinvertebrates in forest and urban rivers confirm the reliability of benthic macroinvertebrates as good indicators of freshwater ecosystem in the coastal zone of Cameroon.

关键词： Urban and Forest Streams Benthic Macroinvertebrates Water Pollution Biological Indices Functional Feeding Groups

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