Dakis-Yaoba Ouédraogo

Muséum National d'Histoire Naturelle

Dans le cadre du programme Life Adapto, une revue systématique a été réalisée afin d’étudier les conséquences de la dépoldérisation sur la biodiversité. Cet article est une synthèse de la revue. Il dresse un bilan des caractéristiques des sites qui ont fait l’objet d’une dépoldérisation, notamment leur localisation, leur historique et la nature des...

Accurate, unbiased and concise synthesis of available evidence following clear methodology and transparent reporting is necessary to support effective environmental policy and management decisions. Without this, less reliable and/or less objective reviews of evidence could inform decision making, leading to ineffective, resource wasteful interventi...

The CESAB – Centre for Biodiversity Synthesis and Analysis – of the FRB is offering the first edition of the following training course: “Biodiversity knowledge synthesis: an introduction to meta-analyses and systematic reviews“. This five-day course aims to train researchers on the methods and techniques of meta-analyses and systematic reviews/maps...

In the context of climate change and sea-level rise, several types of management are employed, including coastal realignment, which consists in reopening polders to marine intrusions. This intervention induces changes in biodiversity. A systematic review, including a meta-analysis, was carried out to assess the impact of coastal realignment on biod...

Background Tropical coral reefs cover ca. 0.1% of the Earth’s surface but host an outstanding biodiversity and provide important ecosystem services to millions of people living nearby. They are currently threatened by local stressors (e.g. nutrient enrichment and chemical pollution arising from poor land management, sewage effluents, agriculture, i...

Background Tropical coral reefs cover only ca. 0.1% of the Earth’s surface but host an outstanding biodiversity and provide important ecosystem services to millions of people living nearby. They are currently threatened by global (e.g., climate change) and local (e.g., chemical pollution) stressors that interact in different ways. While global stre...

Temporal and spatial patterns in flowering phenology were assessed for eight tropical African tree species. Specifically, the frequency and seasonality of flowering at seven sites in central Africa were determined using field data, graphical analysis and circular statistics. Additionally, spatial variation in the timing of flowering across species...

Background Tropical coral reefs cover ca. 0.1% of the Earth’s surface but host an outstanding biodiversity and provide important ecosystem services to millions of people living nearby. However, they are currently threatened by both local (e.g. nutrient enrichment and chemical pollution of coastal reefs, arising from poor land management, agricultur...

Background Linear transportation infrastructures (roads, railways, oil and gas pipelines, powerlines and waterways) generate well documented fragmenting effects on species habitats. However, the potential of verges of linear transportation infrastructures (road and railway embankments, strips of grass under power lines or above buried pipelines, or...

The impacts of logging on the recovery of timber stocks are still largely unknown in Central Africa due to the lack of data on the dynamics of the tree populations concerned. This is particularly the case for Azobé, Lophira alata, a commercially valuable timber species. This study had a twofold aim: (i) to quantify the effects of the forest type an...

The impacts of logging on the recovery of timber stocks are still largely unknown in Central Africa due to the lack of data on the dynamics of the tree populations concerned. This is particularly the case for Azobé, Lophira alata, a commercially valuable timber species. This study had a twofold aim: (i) to quantify the effects of the forest type an...

L’UMS PatriNat mène depuis 2015 - avec l’aide de différents partenaires - une revue systématique (synthèse bibliographique) sur le rôle des dépendances d’infrastructures de transport pour la biodiversité (projet COHNECS-IT). Dans le cadre de cette revue systématique une grille d’analyse a été construite afin d’étudier la robustesse des protocoles e...

En Afrique, la phénologie reproductive des arbres tropicaux, majoritairement annuelle, semble présenter une certaine régularité. Cette étude documente les variations intra- et interannuelles de la phénologie reproductive des arbres de la forêt du Mayombe à partir des données historiques de la Réserve de Luki (République démocratique du Congo). Le d...

Key message This study highlighted the consistency of a functional scheme integrating leaf, stem and root traits, biomass allocation and stem anatomy for 15 tropical tree species at the seedling stage. This functional scheme was shaped by the trade-offs for resource use and the hydraulics of the plants and was found to determine seedling growth. A...

Impacts of climate change on the future dynamics of Central African forests are still largely unknown, despite the acuteness of the expected changes and the extent of these forests. The high diversity of species and the potentially equivalent diversity of responses to climate modifications are major difficulties encountered when using predictive mo...

Although the importance of large trees regarding biodiversity and carbon stock in old‐growth forests is undeniable, their annual contribution to biomass production and carbon uptake remains poorly studied at the stand level. To clarify the role of large trees in biomass production, we used data of tree growth, mortality and recruitment monitored du...

Size at reproduction is a key aspect of species life history that is relatively understudied for long-lived tropical trees. Here, we quantified reproductive diameter for 31 major timber species across 11 sites in Cameroon, Congo, and Central African Republic. Specifically, we examined whether (1) between-species variability is correlated with other...

1. Understanding the environmental determinants of forests deciduousness i.e. proportion of deciduous trees in a forest stand, is of great importance when predicting the impact of ongoing global climate change on forests. In this study, we examine (i) how forest deciduousness varies in relation to rainfall and geology, and (ii) whether the influenc...

In natural forests of Central Africa, several studies indicate a dramatic decrease in commercial trees, including species of concern for conservation. Enrichment planting with these species will favor both the long-term recovery of their populations and biodiversity conservation in logged forests. In this study, we analyzed the survival and growth...

To develop silvicultural guidelines for high-value timber species of Central African moist forests, we assessed the performance of the pioneer Milicia excelsa (iroko, Moraceae), and of the non-pioneer light demander Pericopsis elata (assamela, Fabaceae) in logging gaps and in plantations in highly degraded areas in south-eastern Cameroon. The survi...

In central Africa, most of the timber species require high light at the seedling stage for survival and growth. Forest managers face a regeneration shortage of these light-demanding timber species. To achieve long-term sustainability, there is a need for enrichment methods combining low cost and high species performance. The aim of this study was t...

Understanding how environmental factors could impact population dynamics is of primary importance for species conservation. Matrix population models are widely used to predict population dynamics. However, in species-rich ecosystems with many rare species, the small population sizes hinder a good fit of species-specific models. In addition, classic...

Our research shows that tropical forests of Central Africa are highly diverse: some are very dynamic and more or less disturbed, others are less so; some have a great diversity of trees, others very little. This variety is the wealth of the second largest rainforest in the world and explains its potential to react differently to different anthropog...

Understanding how drought affects annual tree growth in tropical forests is of crucial importance to predict their response to climate change. Previous studies, mainly led in the Neotropics and in Southeast Asia, have yielded contradictory results which might be explained by differences in species studied, in the tree development stages considered,...

Large areas of African moist forests are being logged in the context of supposedly sustainable management plans. It remains however controversial whether harvesting a few trees per hectare can be maintained in the long term while preserving other forest services as well. We used a unique 24 year silvicultural experiment, encompassing 10 4 ha plots...

The management of tropical rain forests in Central Africa is an essential issue because of the economic importance of the production of timber for the country and of the resource supply to local populations (non wood forest products, proteins via hunting). The sustainable management of these forests often relies on population dynamics models for si...

In the Congo Basin where most timber species are light-demanding, the low logging intensities commonly implemented (1–2 trees harvested ha−1) do not provide sufficient canopy gaps to ensure species regeneration. The regeneration of light-demanding timber species may therefore benefit from more intensive logging, or from post-harvest treatments such...

Projection matrix models are intensely used in ecology to model the dynamics of structured populations. When dealing with size-structured populations, there is no satisfactory algorithm to partition size into discrete classes. We show that the Vandermeer–Moloney algorithm for choosing classes is inconsistent with the Usher model, and systematically...