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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
Mycologia | Year: 2015

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

Mavoungou J.F.,Institute Of Recherche En Ecologie Tropicale Iret | Mavoungou J.F.,Universite des Sciences et Techniques de Masuku | Kohagne T.L.,University of Yaounde I | Acapovi-Yao G.L.,University Of Cocody Abidjan Cote Divoire | And 3 more authors.
African Journal of Ecology | Year: 2013

The vertical distribution of Stomoxys spp. was studied in a rainforest area, Ipassa-Makokou biosphere reserve located in the Ivindo National Park of Gabon. From April to June 2006, Vavoua traps were set out during 15 consecutive days per month at different heights above ground level corresponding to vertical layers of rainforest: 50cm, 10, 20 and 30m. Stomoxys calcitrans, S.transvittatus, S.omega, S.niger niger and S.niger bilineatus were more abundant at near ground level (50cm), whereas abundance of S.xanthomelas was greatest in traps higher (20 and 30m) in the canopy. Fly abundance was significantly different among vertical layers of the forest (H=36.91; P<0.001, ddl=3), and among species to another (H=41.11, P<0.001). Vertical distribution of fly species corroborates feeding behaviour as the identification of blood meal origins showed heterogeneity of feeding hosts. High densities of flies were also observed at 10m, and most S.inornatus were captured at that level. These results show that Stomoxyine flies in this rainforest are present in all vertical layers, from the ground level to the canopy. Their ubiquity, regarding both their habitats and their hosts, should be taken into account if a vector control strategy is planned in this touristic area. © 2012 Blackwell Publishing Ltd. Source

Amalfi M.,Catholic University of Louvain | Yombiyeni P.,Institute Of Recherche En Ecologie Tropicale Iret | Decock C.,Catholic University of Louvain
Mycologia | Year: 2010

Fomitiporia nobilissima sp. nov., F. gabonensis sp. nov. and F. ivindoensis sp. nov., three species from the rainforest of the Guineo-Congolian phytogeographic region in Gabon, are described and illustrated. These species share a pileate basidiome, small basidiospores and an absence of setae. The critical morphological features that differentiate them are the pileus habit or shape, pore surface color, pore diameter and possibly ecology. Each new species forms distinct but closely related clades in phylogenetic analysis of DNA sequences from nuclear ribosomal LSU, ITS and translation elongation factor 1-α. Other species in sub-Saharan Africa are discussed briefly. A key to six species of Fomitiporia from sub-Saharan Africa is provided. The new combination Fomitiporia apiahyna is proposed. © 2010 by The Mycological Society of America. Source

Memiaghe H.R.,Institute Of Recherche En Ecologie Tropicale Iret | Lutz J.A.,Utah State University | Korte L.,Smithsonian Conservation Biology Institute | Alonso A.,Smithsonian Conservation Biology Institute | Kenfack D.,Smithsonian Institution
PLoS ONE | Year: 2016

Tropical forests have long been recognized for their biodiversity and ecosystem services. Despite their importance, tropical forests, and particularly those of central Africa, remain understudied. Until recently, most forest inventories in Central Africa have focused on trees ≥10 cm in diameter, even though several studies have shown that small-diameter tree population may be important to demographic rates and nutrient cycling. To determine the ecological importance of small-diameter trees in central African forests, we used data from a 25-ha permanent plot that we established in the rainforest of Gabon to study the diversity and dynamics of these forests. Within the plot, we censused 175,830 trees ≥1 cm dbh from 54 families, 192 genera, and 345 species. Average tree density was 7,026 trees/ha, basal area 31.64 m2 /ha, and above-ground biomass 369.40 Mg/ha. Fabaceae, Ebenaceae and Euphorbiaceae were the most important families by basal area, density and above-ground biomass. Small-diameter trees (1 cm ≥ dbh <10 cm) comprised 93.7% of the total tree population, 16.5% of basal area, and 4.8% of the above-ground biomass. They also had diversity 18% higher at family level, 34% higher at genus level, and 42% higher at species level than trees ≥10 cm dbh. Although the relative contribution of small-diameter trees to biomass was comparable to other forests globally, their contribution to forest density, and diversity was disproportionately higher. The high levels of diversity within small-diameter classes may give these forests high levels of structural resilience to anthropogenic/natural disturbance and a changing climate. This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication. Source

Medjibe V.P.,University of Florida | Putz F.E.,University of Florida | Starkey M.P.,Wildlife Conservation Society | Ndouna A.A.,Projet EFI Gabon | And 2 more authors.
Forest Ecology and Management | Year: 2011

Selective logging is an important socio-economic activity in the Congo Basin but one with associated environmental costs, some of which are avoidable through the use of reduced-impact logging (RIL) practices. With increased global concerns about biodiversity losses and emissions of carbon from forest in the region, more information is needed about the effects of logging on forest structure, composition, and carbon balance. We assessed the consequences of low-intensity RIL on above-ground biomass and tree species richness in a 50. ha area in northwestern Gabon. We assessed logging impacts principally in 10 randomly located 1-ha plots in which all trees ≥10. cm dbh were measured, identified to species, marked, and tagged prior to harvesting. After logging, damage to these trees was recorded as being due to felling or skidding (i.e., log yarding) and skid trails were mapped in the entire 50-ha study area. Allometric equations based on tree diameter and wood density were used to transform tree diameter into biomass.Logging was light with only 0.82trees (8.11m3) per hectare extracted. For each tree felled, an average of 11 trees ≥10cm dbh suffered crown, bole, or root damage. Skid trails covered 2.8% of the soil surface and skidding logs to the roadside caused damage to an average of 15.6 trees ≥10cm dbh per hectare. No effect of logging was observed on tree species richness and pre-logging above-ground forest biomass (420.4Mgha-1) declined by only 8.1% (34.2Mgha-1). We conclude from these data that with harvest planning, worker training in RIL techniques, and low logging intensities, substantial carbon stocks and tree species richness were retained in this selectively logged forest in Gabon. © 2011 Elsevier B.V. Source

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