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Bartolozzi L.,University of Florence | Loudit S.M.B.,Institute Of Recherches Agronomiques Et Forestieres Iraf
Zootaxa | Year: 2011

The genus Myrmecobrenthus Kleine, 1920 is revised and a key for the species of this genus is provided. Myrmecobrenthus susinii sp. nov. is described from Gabon, and compared with the closely related M. ater Damoiseau, 1961 and M. wasmanni Kleine, 1920, from which it mainly differs in the shape of the male head and rostrum. Myrmecobrentus wasmanni is recorded for the first time from Gabon. Copyright © 2011 · Magnolia Press. Source

Ndiade-Bourobou D.,Institute Of Recherches Agronomiques Et Forestieres Iraf | Hardy O.J.,Roosevelt University | Favreau B.,CIRAD - Agricultural Research for Development | Moussavou H.,Institute Of Recherches Agronomiques Et Forestieres Iraf | And 3 more authors.
Molecular Ecology | Year: 2010

We analysed the spatial distribution of genetic diversity to infer gene flow for Baillonella toxisperma Pierre (Moabi), a threatened entomophilous pollinated and animal-dispersed Central African tree, with typically low density (5-7 adults trees/km2). Fifteen nuclear and three universal chloroplast microsatellites markers were used to type 247 individuals localized in three contiguous areas with differing past logging intensity. These three areas were within a natural forest block of approximately 2886km2 in Gabon. Expected heterozygosity and chloroplast diversity were He nuc=0.570 and Hcp=0.761, respectively. FIS was only significant in one area (FIS=0.076, P<0.01) and could be attributed to selfing. For nuclear loci, Bayesian clustering did not detect discrete gene pools within and between the three areas and global differentiation (FSTnuc=0.007, P>0.05) was not significant, suggesting that they are one population. At the level of the whole forest, both nuclear and chloroplast markers revealed a weak correlation between genetic relatedness and spatial distance between individuals: Spnuc=0.003 and Spcp=0.015, respectively. The extent of gene flow (σ) was partitioned into global gene flow (σg) from 6.6 to 9.9km, seed dispersal (σs) from 4.0 to 6.3km and pollen dispersal (σp) from 9.8 to 10.8km. These uncommonly high dispersal distances indicate that low-density canopy trees in African rainforests could be connected by extensive gene flow, although, given the current threats facing many seed disperser species in Central Africa, this may no longer be the case. © 2010 Blackwell Publishing Ltd. Source

Anguilet E.C.F.,University of Liege | Anguilet E.C.F.,Institute Of Recherches Agronomiques Et Forestieres Iraf | Nguyen B.K.,University of Liege | Ndong T.B.,Institute Of Recherches Agronomiques Et Forestieres Iraf | And 2 more authors.
Biotechnology, Agronomy and Society and Environment | Year: 2015

Introduction. Meliponini and Apini contribute to the pollination of flowering plants and to improving agricultural yields. These bees’ diversity, distribution and abundance depend on the ecosystem in which they evolve. The present work aims to summarize the diversity, distribution, abundance, potential threats, challenges and issues faced with respect to these social bees in Africa. Literature. In Africa, there were 21 species of Meliponini and 2 species of Apini (Apis). Aspects related to the species diversity, distribution, biology, ecology and abundance of nests are poorly documented, especially for Meliponini. This deficit could be related to a lack of interest of the authors or the various difficulties in performing these studies in Africa. With regard to the difficulties, there is a need to clarify the taxonomy of Meliponini, and the observation of nests in certain forest environments is difficult. Nest predation and habitat loss are the main threats that could cause the depopulation of certain social bee species in Africa. If there is currently new evidence that diseases and pests did not endanger these bees, then there is a need for further studies for better assessment of the risks that are associated with these potential threats. Conclusions. Work on the diversity, distribution and abundance of the social bees must be strengthened to address the challenges that are related to these insects in Africa. Indeed, this approach will contribute to answering the challenges of sustainable management of the biodiversity and economic and agricultural issues. © 2015, FAC UNIV SCIENCES AGRONOMIQUES GEMBLOUX .All Rights Reserved. Source

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