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Floristic Diversity, Stand Structure and Plant Life Traits in the Forest-Savanna Mosaic at Ndjole (Centre Cameroon)

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Open Journal of Ecology 2024年第4期14卷 309-330页

作者： Djeuguen Vanessa tchaleu Solefack Marie Caroline Momo Mateso Aimé Kambale Ndondjeu Charles Tafen Yanick Borel Kamga Victor François Nguetsop Research Unit of Applied Botany (URBOA) Department of Plant Biology Faculty of Science University of Dschang Dschang Cameroon

With the aim of assessing floristic diversity, stand structure and vegetation ecology, the present work was carried out in the savanna mosaic forest of the locality of Ndjole (Centre Cameroon). A total of 30 floristic plots of 40 m × 40 m (1600 m2) were delineated in the different ecosystems (forest, forest-savanna contact zone and the savanna). Within each plot, all individuals with a diameter at breast height ≥ 10 cm at 1.30 m were taken into account. ANOVA was used to compare the means of the diversity indices of the different ecosystems, and the DUNCAN test at 5% significance level (XLSTAT 2016) to separate these means. A total of 85 species belonging to 67 genera and 33 families were recorded. That is, 68 species in semi-caducifolia forest, 45 in forest-savanna contact zone and 18 in savanna. Urticaceae, Combretaceae, Apocynaceae, Myristicaceae and Euphorbiaceae are the most diverse families in the forest. On the other hand, in contact zones, the Euphorbiaceae, Fabaceae, Annonaceae and Moraceae families are the most diversified, while in the savannas, the Combretaceae, Fabaceae and Annonaceae families are the most diversified. Shannon’s diversity index values (1.7 to 2.37 bits) reflect low specific diversity;Piélou’s equitability (0.86 to 0.9) shows good distribution of individuals within species. The diametric structure of woody species shows an inverted “J” shape in all plant communities. This indicates a high regeneration potential characterized by a greater number of small trees than large trees. Mesophanerophytes and megaphanerophytes are dominant in forests and forest-savanna contact zones, and microphanerophytes in the savannas. Endozoochory is the main mode of diaspore dissemination. As regards the distribution of phytogeographical types, it shows the overall dominance of Guineo-Congolese species in all plant communities. Our study provides detailed data on forest-savanna floristic and plant life traits in the mosaic and recommends further st

关键词： Mosaic Communities Dissemination Regeneration Diversity

Floristic Diversity, Stand Structure and Plant Life Traits in the Forest-Savanna Mosaic at Ndjole (Centre Cameroon)

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Spectrum of Meningitis in Adult at the Douala General Hospital

Open Journal of Ecology（生态学期刊） 2024年第4期 309页

作者： Djeuguen Vanessa tchaleu Solefack Marie Caroline Momo Mateso Aimé Kambale Ndondjeu Charles Tafen Yanick Borel Kamga Victor François Nguetsop

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World Journal of Neuroscience 2014年第2期4卷 144-151页

作者： Yacouba N. Mapoure Henry N. Luma Dieudonné Gnonlonfoun Paul M. Ossou-Guiet Xaverie Biloa Jacques N. Doumbe Hugo Bertrand N. Mbatchou Benjamin Clet N. tchaleu Julius Y. Fonsah Albert S. Mouelle Alfred K. Njamnshi Department of Clinical Sciences Douala General Hospital Douala Cameroon Department of Clinical Sciences The University of Douala Douala Cameroon Department of Clinical Sciences Université des Montagnes Douala Cameroon Department of Neurology Brazzaville University Teaching Hospital Brazzaville Congo Department of Neurology National University Hospital Centre Cotonou Bénin Department of Neurology The University of Yaoundé I Yaoundé Cameroon Department of Neurology Yaoundé Central Hospital Yaoundé Cameroon

Objectives: Describe the clinical, aetiological and prognostic features of infectious meningitis in adults at the Douala General Hospital (DGH). Patients and Methods: We carried out a 5-year retrospective cross-sectional study at the DGH, on data from the registers of the bacteriology and biochemistry laboratories. Cases of meningitis were identified from the results of the cerebrospinal fluid (CSF) analysis, and the patient clinical file was obtained. Cases files of patients aged 15 years and above were included. For each patient, sociodemographic, clinical features and hospital mortality data were extracted. Results: During study period, 1877 CSF analyses were recorded and 135 were enrolled for data analysis. Up to 74 patients (55%) were male and the mean age was 40.04 ± 12.5 years. The time lapse between the onset of symptoms and consultation was 12.24 ± 11.16 days. The main clinical signs were meningeal syndrome (96.3%), neck stiffness (71.1%), reduced alertness (64.4%) and confusional states (55.6%). The main aetiology was bacterial (45.19%) withStreptococcus pneumoniae?(45.90%) and?Neisseria meningitis?(29.51%) leading. The other aetiologies were viral (21.48%), fungal with?Cryptococcus neoformans?(20%) and meningeal tuberculosis (13.33%). Fifty eight patients (42.9%) had a positive HIV serology. The mean duration of hospitalization was 9.05 ± 8.1 days, and the total in-hospital mortality was 25.18%. 117 patients (86.8%) had received antibiotherapy before diagnosis. Conclusion: The clinical features of meningitis in the DGH are as in classical description. However, the mortality is high and the major aetiologies appear to be associated with HIV infection at least in part. Prospective multi-centric studies are needed to provide more evidence for the development of staged management guidelines in our resource-limited settings.

关键词： Meningitis Signs Aetiologies Mortality Adults Douala Cameroon

Stroke Epidemiology in Douala: Three Years Prospective Study in a Teaching Hospital in Cameroon

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World Journal of Neuroscience 2014年第5期4卷 406-414页

作者： Yacouba N. Mapoure C. Kuate Clet B. tchaleu Hugo B. Mbatchou Ngahane Gérard N. Mounjouopou Hamadou Ba Salomon Mbahe Julius Y. Fonsah Gérard Beyiha Henry N. Luma Albert S. Mouelle Philomène K. Ndouongo Alfred K. Njamnshi Department of Clinical Sciences University of Douala Douala Cameroon Department of Internal Medicine Douala General Hospital Douala Cameroon Department of Internal Medicine University of Yaoundé I Douala Cameroon Department of Neurology Yaoundé Central Hospital Yaoundé Cameroon Department of Surgery University of Douala Douala Cameroon Department of Neurology University of Health Sciences Libreville Gabon

Background and Objectives: Cerebro-vascular accident or stroke constitutes a major challenge in sub-Saharan Africa. In Cameroon, basic epidemiologic data are not routinely available. Aims: The aim of this study was to determine the type, the associated risk factors, time to admission, the clinical presentation and the case fatality of stroke at the Douala General Hospital (DGH) in Cameroon. Methods: A cross-sectional study was performed from January 1, 2010 to December 31, 2012 at the neurology and intensive care units of the DGH. All patients above 15 years of age with a diagnosis of established stroke were enrolled. For each patient, socio-demographic, clinical and paraclinical data were recorded as well as the duration of hospitalization and the case fatality. Results: In all, 325 patients were enrolled with males constituting 68.1% and general mean age of 58.66 ± 13.6 years. The mean initial consultation delay was 47.36 ± 18.48 hours. The majors cerebro-vascular risk factors were hypertension (81.15%), chronic alcohol consumption (28.3%), diabetes mellitus (20.61%), obesity (18.15%), cigarette smoking (16%), dyslipidemia (8.9%) and atrial fibrillation (3.07%). Ischemic stroke accounted for 52% of cases while 48% were hemorrhagic. The mean duration of hospitalization was 8.58 ± 6.35 days with a case fatality rate of 26.8%. Septic conditions appeared to be the leading cause of death accounting for 35.6% of cases. Conclusion: Stroke in the DGH is associated with a high case fatality rate and hypertension remains the number one risk factor. There is a clear and urgent need for public health authorities to reinforce measures for the control of modifiable stroke risk factors.

关键词： Stroke Epidemiology Risk Factors Case Fatality Douala Cameroon

Stroke Epidemiology in Douala: Three Years Prospective Study in a Teaching Hospital in Cameroon

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