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Dynamics of Land Use in the Basin of Ancient Lagoons (Toho, Todougba, Ahouangan, Dati, Djonou) in South Benin from 1990 to 2020 and Their Current Vulnerability to Pollution

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Journal of Geoscience and Environment Protection 2021年第11期9卷 28-45页

作者： Mardochée Ephraïm Achoh Hyppolite Agadjihouédé Luc Gangbè Romaric Aïzonou Christelle Claudia Akotossodé Simon Ahouanssou Montcho antoine chikou Unit of Aquaculture Research and Fisheries Management Laboratory of Fisheries and Animal Sciences National University of Agriculture Ketou Benin National Institute of Agricultural Research of Benin Cotonou Benin Department of Environment and Renewable resources University of Ibadan Ibadan Nigeria Laboratory of Hydrobiology and Aquaculture (LHA) Faculty of Agronomic Sciences University of Abomey-Calavi Cotonou Benin

The management of living resources and space requires continuous assessments in order to adjust deviations as necessary for sustainable use. It is in this context that the present study was conducted and aims on the one hand to assess the dynamics of land use in the basin of the five-finger lagoons and on the other hand to assess the degree of their vulnerability to organic pollution. Thus, the satellite images were collected in free access on the site http://***/ of the USGS (US Geological Survey) of NASA. Image correction was performed with ENVI 5.1 software and classification was performed with ArcGIS 10.8 software. The degree of vulnerability was evaluated through the weighting of different parameters (slope, land use, type of pass, runoff, and density of the hydrobiological network) by the multi-criteria method of Saaty (Analytic Hierarchy Process Methods) and the application of mapping. It is found that for the dynamics of land use, forests, savannahs and plantations have experienced a significant reduction in their area (respectively 98.9%, 99.60% and 77.10%) between 1990 and 2020. As for settlements, water bodies and swamps, they have increased in area to different proportions. The soils are more denuded (Tc = 1264%). This makes the living space vulnerable and therefore facilitates the transfer of pollutants to the aquatic environment. The evaluation of the degree of vulnerability to pollution of the lagoons of the basin showed that the Toho-and Todougba lagoons are under a very high degree of vulnerability (73% - 100%) and do not augur well for the living resources. The other lagoons, notably the Dathi and Djonou lagoons, are also under stress from the pressures of surrounding activities. It is therefore important to assess the level of pollution of the Toho and Todougba lagoons through pollution indices in order to make decisions that will allow their sustainable use, especially for aquaculture.

关键词： Land Use Vulnerability Lagoons Pollution Anthropogenic Activity

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Inventory of Estuarine and Lagoonal Ecosystems Subjected to Sand-Mining Activities in Southern Benin (West Africa)

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Journal of Environmental Protection 2019年第4期10卷 473-487页

作者： Romaric K. Lalèyè Hyppolite Agadjihouèdé antoine chikou Hamed Adjagbo Crépin Assogba Djiman Lédéroun Philippe A. Lalèyè Laboratory of Hydrobiology and Aquaculture (LHA) Faculty of Agricultural Sciences University of Abomey-Calavi Cotonou Republic of Benin Unity of Research in Aquaculture Aquatic Biology and Ecology/Laboratory of Animals and Halieutics Science (URABEA/LaSAH) School of Aquaculture National University of Agriculture Kétou Republic of Benin

Sand is a useful resource for the development of any society. As such, the issues related to its extraction are everywhere present in Benin, especially in the southern part of the country. For the purposes of eventually characterizing those issues, the present study is undertaken with a focus on inventorying estuarine and lagoonal ecosystems which are subjected to sand mining in southern Benin. The study area covers both the Eastern Complex and the Western Complex. The Eastern Complex includes the Porto-Novo Lagoon and the Ouémé River delta;while the Western Complex includes the Coastal Lagoon, the Aheme Lake along with its channels, and the Mono Basin. The method used in this study is a systematic inventorying of all known and documented sites as kept on record with relevant state offices in charge of the management of those resources. Then, the data were completed by combing the whole area for direct census observations and field interviews with stakeholders. All inventoried sites have been geo-referenced using a GARMIN GPS and their surface areas have been established. To date, 43 sand-mining sites have been identified, of which 29 are located in the Oueme Delta and in the Porto-Novo Lagoon, 8 are in the Coastal Lagoon, and 6 are in the Aheme Lake and its channels as well as in the Mono River basin. The areas are small in the Oueme Delta, where extraction is mostly manual, but get to be more than 89-ha wide in other places such as the Coastal Lagoon where the process is rather mechanized.

关键词： Inventory Sand-Dredging Aquatic Ecosystems Southern Benin

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Exploitation Patterns of Anchovies (Engraulis encrasicolus) by Marine Artisanal Fisheries in Togo (West Africa)

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Journal of Fisheries Science 2020年第2期2卷 24-31页

作者： DédéOkangny Gabriel HoinsoudéSegniagbeto Délagnon Assou antoine chikou Elie Montchowui Tona Kokou Daniele Dendi John EFa Luca Luiselli Philippe Lalèyè 无 Laboratory of Hydrobiology and Aquaculture(LHA) Faculty of Agricultural SciencesUniversity of Abomey-Calavi01BP 526 Cotonou-Benin Laboratory of Ecology and Ecotoxicology(LaEE) Department of Zoology and Animal BiologyFaculty of SciencesUniversity of Lomé01BP 1515 Lomé-Togo Département des Sciences Animales et Vétérinaire Ecole supérieure d’AgronomieUniversitéde Lomé Institute for Development EcologyConservation and Cooperationvia G.Tomasi di Lampedusa 33I.00144 RomeItaly Department of Applied and Environmental Biology Rivers State University of Science and TechnologyP.M.B.5080Port HarcourtNigeria Division of Biology and Conservation Ecology School of Science and the EnvironmentManchester Metropolitan UniversityManchester M15GDUK Center for International Forestry Research(CIFOR) CIFOR HeadquartersBogor 16115Indonesia Togolese Society for Nature Conservation(AGBO-ZEGUE NGO) 06 BP:6057 Lomé-Togo

Pelagic fish,including sardines and anchovies(Order Clupeiformes),are the most common species taken by artisanal marine fisheries along the Togolese *** investigated fisher involvement as well as fish captures over a period of 10 years,particularly of the European anchovy(Engraulis encrasicolus).Our results indicate that 60%of fishers operated from the Loméfishing harbour,most fishers being Ghanaians working seasonally in Togo.63.7%of all the fishers used canoes with outboards,a higher percentage compared to the previous *** fishing gear type were identified,with bottom gillnet and surface gillnet being the most commonly ***,in the most important fishing camp in the country in terms of fish production(Loméfishing harbour),all fishers used shark ***,fisheries catches did not change significantly across years,but anchovy fishing effort and catch per unit of effort(CPUE)declined over the study period,suggesting some depletion of the species stocks on the Togolese coast and a demotivation of fishers.

关键词： Anchovy production Togo fisheries West Africa

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