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Yaoundé, Cameroon

Mangambu Mokoso J.D.,University Officielle Of Bukavu | Noiha Noumi V.,University of Yaounde I | Zapfack L.,University of Yaounde I | Sonke E.B.,University of Yaounde I
International Journal of Environmental Studies

The study was carried out in Kahuzi-Biega National Park in Congo. Five surveys of variable surface were conducted at different altitudes. A mean recovery (RM) of 57.5 was recorded for Piper capensis. The ecological conditions have led to different morphology of leaves. For example, a considerable reduction of the leaf surface has led to limited water loss through transpiration. Piper capensis is widely distributed where the sunlight is sufficient. The presence of light favours the expansion of Piper capensis whose height can exceed 2 m; in the understorey, Piper capensis rarely reaches 1 m in height. The expansion of Piper capensis might be favourable for the restoration of the previous vegetation; several seeds of the main species of the forest were recorded within the studied populations. © 2010 Taylor & Francis. Source

Yombiyeni P.,Institute Of Recherche En Ecologie Tropicale Iret | Balezi A.,University Officielle Of Bukavu | Amalfi M.,Catholic University of Louvain | Decock C.,Catholic University of Louvain

Four species are added to Phylloporia. Three species, originating from the western edge of the Guineo-Congolian rainforest in Gabon (central Africa), are described as new. Phylloporia afrospathulata sp. nov. forms seasonal, stipitate, solitary basidiomata emerging from soil, more likely connected to buried roots, and has broadly ellipsoid basidiospores. Phylloporia inonotoides sp. nov. forms seasonal sessile, soft basidiomata, solitary at the base of small-stemmed trees including Crotonogyne manniana (Euphorbiaceae) and Garcinia cf. smeathmannii (Clusiaceae). It has a homogeneous context, large pores (2-3 mm), and oblong-ellipsoid to suballantoid basidiospores. Phylloporia fulva sp. nov. forms sessile, conchate, mostly pendant, gregarious basidiomata emerging from the trunk of an unidentified small-stemmed tree and has small, subglobose basidiospores. This species is compared to Polyporus pullus and Phylloporia pulla comb. nov. and proposed based on the study of the type specimen. Phylogenetic inferences using partial nuc 28S DNA sequence data (region including the D1/D2/D3 domains) and the most exhaustive dataset available to date resolved these new morphospecies as three distinct terminal lineages. No sequence data of P. pulla currently is available. The 28S-based phylogenic inferences poorly resolved the interspecific relationships within the Phylloporia clade. © 2015 by The Mycological Society of America, Lawrence, KS 66044-8897. Source

Lushombo M.,University Officielle Of Bukavu
Aquatic Ecosystem Health and Management

This study describes the inshore fishery on the littoral cichlids in Lake Tanganyika, to evaluate the potential impact of fishing gear on the cichlid fishes and their diversity. The fishing activity at the northwestern end of Lake Tanganyika in Uvira was examined from March to July 2010. In total, the catch examined was composed of 3,555 cichlid fish: 47 species and 30 genera identified representing 10 of the 16 tribes of Lake Tanganyika cichlids. Fishermen in Uvira, exploiting littoral cichlids, used three main fishing gears including beach seine, frame gillnet and mosquito net, varying according to the substrates of the littoral habitat at different study sites. They generally captured immature fishes (63%) and small-sized fish due to their small mesh size and unsuitable fishing techniques. The beach seine caught more species on the sandy substrate while the frame gillnets caught more individuals. The cichlid species Aulonocranus dewindti was the most abundant in the catches. © 2014 Copyright Taylor & Francis Group, LLC. Source

Christian A.A.,Center for International Forestry Research | Heritier M.K.,University Officielle Of Bukavu | Janvier L.,University of Kisangani | Hippolyte N.,University of Kisangani

The knowledge of factors that explain the spatial organization of biodiversity remains an important tool to define strategies for natural resources' inventory, biodiversity conservation as well as sustainable management of tropical rainforests. Island forests are particularly defined as fragile ecosystems that present peculiar biological and ecological features that are very crucial for conservation. Many studies explain that soil plays a crucial role in the species spatial distribution and their maintenance in the environment. Kongolo Island is home of tropical rainforests forests established on different soil types. They also show differences in their floristic and structural composition. Based on a multi-strata phytosociological approach, this study aims to characterize the floristic and structural composition, and to analyze the factors that explain specific patterns observed in the arborescent forest layers' of the two forest types of Kongolo Island. Source

Vleminckx J.,Roosevelt University | Drouet T.,Roosevelt University | Amani C.,University Officielle Of Bukavu | Lisingo J.,University of Kisangani | And 2 more authors.
Journal of Vegetation Science

Questions: Soil properties have been shown to partially explain tree species distribution in tropical forests. Locally, species turnover across space can result not only from edaphic heterogeneities but also from limited seed dispersal. To characterize the contribution of each process, contact areas between contrasted soil types offer ideal settings. In the present study, we aimed to test species and species assemblage responses to a sharp edaphic discontinuity in a tropical forest tree community. Location: Yoko forest reserve (6975 ha), Democratic Republic of the Congo. Methods: We set up four 500-600-m long parallel transects crossing two contrasted edaphic habitats, one lying on clayey soil and the other on sandy soil. The canopy and subcanopy trees were identified and geo-referenced along the transects over a width of 50 m and 5 m, respectively, and soil samples were collected every 50 m to characterize each habitat. Results: Correspondence analyses indicated a clear differentiation of tree communities between sandy and clayey soils. Using a torus-translation method combined with Chi-squared non-parametric tests, we observed that ca. 40% and 18% of the species represented by at least 12 individuals displayed significant density differences according to habitat in the canopy and subcanopy, respectively, although very few species displayed significant differences in their relative abundance. Nevertheless, whole community tests of differentiation (in species relative abundances) between soil types were significant in both strata, even after removing individual species or families displaying a significant habitat preference. Conclusion: While only a minority of species displayed a clear habitat preference, we still observed a community-wide impact of the edaphic discontinuity on species assemblages at a local scale. Our results provide further evidence for the major contribution of environmental heterogeneity in maintaining biodiversity in tropical forests. © 2014 International Association for Vegetation Science. Source

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