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Biology and Distribution of Mangrove Crabs in the Wouri River Estuary, Douala, Cameroon

Journal of Water Resource and Protection 2014年第4期6卷 236-248页

作者： Vanessa Maxemilie Ngo-Massou guillaume léopold essomè-koum Ernest Kottè-Mapoko Ndongo Din 1Department of Botany Faculty of Science The University of Douala Douala Cameroon 2Department of Biological Sciences High Teacher’s Training College The University of Yaounde I Yaounde Cameroon Department of Botany Faculty of Science The University of Douala Douala Cameroon

Crabs appear as the most important group of mangrove epifauna. Their distribution seems influenced by some biotic and abiotic parameters. To verify the interactions between crab populations and relevant environmental components, six mangrove sites around the city of Douala (3°40' - 4°11'N and 9°16' - 9°52'E) were selected. During six months, four 25-min independent time-biased samples methods were conducted in the plot of 4 × 4 m2 delimited inside each zonation throughout transect. The distance from plot to water and its groundwater salinity, temperature, conductivity and pH were measured. The individual sex, fresh weight and carapace size were determined. 3016 individuals were harvested (57% of females). Perisesarma kamermani was the most abundant (29%) while Chiromates angolense was the most frequent (13.47%). Cardisoma armatum was only found in Pandanus zone. Crab species number was positively correlated with tree, suggesting that the mangrove vegetation is important to the crab fauna as a habitat and food supply. Sex ratio showed a significant difference for Chiromates buetikoferi 1:2.34 (χ2 = 33.21) and for Perisesarma huzardi 1.36:1 (χ2 = 39.98). Portunus validus live closer to water between 5 - 20 m while Cardisoma armatum was found 70 m away from water. Portunus validus was present exclusively in high salinity zones whereas Perisesarma kamermani dominate in low salinity zone. This baseline ecological study of crab mangroves is important for monitoring, management and conservation of mangrove ecosystems.

关键词： Abundance Diversity Frequency Sesarmidae Sex Ratio

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local Perception of Climate Change and Adaptation in Mangrove Areas of the Cameroon Coast

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Journal of Water Resource and Protection 2016年第5期8卷 608-618页

作者： Ndongo Din Vanessa Maxemilie Ngo-Massou guillaume léopold essomè-koum Ernest Kottè-Mapoko Jean Michel Emane Akusa Dorice Akongnwi Richelieu Tchoffo Department of Botany Faculty of Science The University of Douala Douala Cameroon Technical Assistance Unit Environmental and Social Management Plan of the Mefou Watershed Cameroon Water Utilities Corporation Project Douala Cameroon Department of Biological Sciences High Teacher’s Training College The University of Yaounde I Yaounde Cameroon

Mangroves supply essential ecosystem services to tropical informal economies. In the Cameroon coastal region, the impacts of various projections on change in temperatures and precipitations sound low compared to the pressure of human activities. This survey evaluated the sensitivity of local population on the impact of climate change and the vulnerability of coastal ecosystems. An investigation carried out on 425 individuals was based on the major income and development activities, the knowledge of the subject, the information sources, the origin of changes, perceptible effects, risks and consequences. More than 90% of interviewees have heard about climate change essentially from radio (20%). Industries (47.53%) are perceived to have major responsibility for temperature (78%) and precipitation (67%) changes and increased inundation (39.07%) was perceived as the highest risk. Compared with Cartesian predictions in the area, the results have shown the sensitivity of population to local variation of climate factors. No efficient endogenous measure has been recorded. Forest and specially mangroves are the most affected ecosystems by local activities. Expected extension of the dry season could affect the natural regeneration and the structure of mangrove forests. Considering the importance of woody species in the local economies, the lack of appropriate actions and adaptation measures will lead to the total degradation of mangroves.

关键词： Anthropogenic Activities Investigation Prediction Risks Vulnerability

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Dynamic of Mangrove Associated Molluscs in Anthropized Areas of the Cameroon Coastline

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Open Journal of Ecology 2021年第8期11卷 565-579页

作者： Ernest Flavien Kottè-Mapoko Vanessa Maxemillie Ngo-Massou guillaume léopold essomè-koum laurant Nyamsi-Moussian Alphonse Konango-Samè Boubakary Ndongo Din Department of Fisheries Management Institute of Fisheries and Aquatic Sciences at Yabassi the University of Douala Douala Cameroon Department of Biological Sciences Higher Teacher’s Training College the University of Yaoundé Yaoundé Cameroon Department of Aquatic Ecosystems Management Institute of Fisheries and Aquatic Sciences at Yabassi the University of Douala Douala Cameroon Department of Botany Faculty of Sciences the University of Douala Douala Cameroon

Due to unabated anthropogenic exploitations, mangrove forests globally are constantly under pressure and degradation, which may result in the reduction of ecosystem functioning and biodiversity. Molluscan fauna, which is one of the main macroinvertebrates that play a major ecological role in nutrient dynamics in mangroves, are sensitive to the changes in their habitat. This survey aims to assess the impact of anthropogenic activities on the diversity of molluscs’ communities in the mangrove forest. Anthropogenic disturbances within 20 sampling sites were valued at six mangrove stands and patched scoring the degree of influence according to vegetation, structure, waste and trampling. Molluscs were caught by hand and counted within 1 × 1 m2 plots placed at three points distant of 50 m established using a straight line transect of 100 m. Upon the 20 sites investigated, five were slightly disturbed, eight moderately disturbed and seven sites were highly disturbed. The mean abundance of molluscs decreased from slightly disturbed areas (172.25 ± 73.09 Ind·m−2) to highly disturbed areas (100.57 ± 62.84 Ind·m−2). Highly disturbed areas have shown lower species richness (R = 1.09 ± 0.15) and diversity (H’ = 2.30 ± 0.31). Human activities in the mangrove forest could particularly have effects on the diversity of molluscs, however, feature potential conservation measures have to be in harmony with the needs of the local population.

关键词： Anthropogenic Disturbance Index Human Activities level of Degradation Mollusc Diversity

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