15 Works

Plasmodium infection induces cross-reactive antibodies to carbohydrate epitopes on the SARS-CoV-2 Spike protein

Sarah Lapidus, Feimei Liu, Arnau Casanovas-Massana, Yile Dai, John D. Huck, Carolina Lucas, Jon Klein, Renata B. Filler, Madison S. Strine, Mouhamad Sy, Awa B. Deme, Aida S. Badiane, Baba Dieye, Ibrahima Mbaye Ndiaye, Younous Diedhiou, Amadou Moctar Mbaye, Cheikh Tidiane Diagne, Inés Vigan-Womas, Alassane Mbengue, Bacary D. Sadio, Moussa M. Diagne, Adam J. Moore, Khadidiatou Mangou, Fatoumata Diallo, Seynabou D. Sene … & Amy K. Bei
Individuals with acute malaria infection generated high levels of antibodies that cross-react with the SARS-CoV-2 Spike protein. Cross-reactive antibodies specifically recognized the sialic acid moiety on N-linked glycans of the Spike protein and do not neutralize in vitro SARS-CoV-2. Sero-surveillance is critical for monitoring and projecting disease burden and risk during the pandemic; however, routine use of Spike protein-based assays may overestimate SARS-CoV-2 exposure and population-level immunity in malaria-endemic countries.

Data from: Closing a gap in tropical forest biomass estimation: taking crown mass variation into account in pantropical allometries

Pierre Ploton, Nicholas Barbier, Stéphane Takoudjou Momo, Maxime Réjou-Méchain, Faustin Boyemba Bosela, Georges Chuyong, Gilles Dauby, Vincent Droissart, Adeline Fayolle, Rosa Calisto Goodman, Mathieu Henry, Narcisse Guy Kamdem, John Katembo Mukirania, David Kenfack, Moses Libalah, Alfred Ngomanda, Vivien Rossi, Bonaventure Sonké, Nicolas Texier, Duncan Thomas, Donatien Zebaze, Pierre Couteron, Uta Berger & Raphaël Pélissier
Accurately monitoring tropical forest carbon stocks is an outstanding challenge. Allometric models that consider tree diameter, height and wood density as predictors are currently used in most tropical forest carbon studies. In particular, a pantropical biomass model has been widely used for approximately a decade, and its most recent version will certainly constitute a reference in the coming years. However, this reference model shows a systematic bias for the largest trees. Because large trees are...

Data from: The evolution of communication in two ant-plant mutualisms

Marion Vittecoq, Champlain Djieto-Lordon, Bruno Buatois, Laurent Dormont, Doyle McKey & Rumsaïs Blatrix
Myrmecophytes are plants that provide nesting sites and food to ants that protect them against herbivores. Plant signals function to synchronize ant patrolling with the probability of herbivory. We compared the communication signals in two symbioses involving ant and plant pairs that are closely related. The two plants emitted the same volatile compounds upon damage. These compounds are simple molecules common in the plant kingdom. Electroantennography revealed that the two symbiotic ants, as well as...

Effect of B-site co-substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion

Edwin A. Nforna, Patrice Kenfack Tsobnang, Roussin Lontio Fomekong, Hypolite Mathias Tedjieukeng, John Ngolui Lambi & Julius Numbonui Ghogomu
Samples of cobalt-doped neodymium orthoferrite compounds, NdCoxFe1-xO3 (0.0 ≤ x ≤ 0.5) were synthesized via glycine auto-combustion between 250 – 300 °C and calcined at 500 °C for two hours. X-ray diffraction showed that all compounds had an orthorhombic perovskite structure with space group Pbnm. Increasing cobalt doping gradually reduced the lattice parameters and contracted the unit cell volume. Both X-ray diffraction and Scanning Electron Microscopy showed that the particles were spherical and in the...

Data from: Individualistic evolutionary responses of central African rain forest plants to Pleistocene climatic fluctuations

Andrew Helmstetter, Kevin Bethune, Narcisse Kamdem, Bonaventure Sonke & Thomas Couvreur
Understanding the evolutionary dynamics of genetic diversity is fundamental for species conservation in the face of climate change, particularly in hyper-diverse biomes. Species in a region may respond similarly to climate change, leading to comparable evolutionary dynamics, or individualistically, resulting in dissimilar patterns. The second largest expanse of continuous tropical rain forest (TRF) in the world is found in Central Africa. Here, present-day patterns of genetic structure are thought to be dictated by repeated expansion...

Data from: Cost-effective enrichment hybridization capture of chloroplast genomes at deep multiplexing levels for population genetics and phylogeography studies

Cédric Mariac, Nora Scarcelli, Juliette Pouzadou, Adeline Barnaud, Claire Billot, Adama Faye, Vincent Maillol, Sylvain Santoni, Yves Vigouroux, Thomas L. P. Couvreur, Ayite Kougbeadjo, François Sabot & Guillaume Martin
Biodiversity, phylogeography and population genetic studies will be revolutionized by access to large datasets thanks to next generation sequencing methods. In this study, we develop an easy and cost-effective protocol for in-solution enrichment hybridization capture of complete chloroplast genomes applicable at deep multiplexed levels. The protocol uses cheap in-house species-specific probes developed via long range PCR of the entire chloroplast. Barcoded libraries are constructed and in-solution enrichment of the chloroplasts is done using the probes....

Data from: One-locus-several-primers: a strategy to improve the taxonomic and haplotypic coverage in diet metabarcoding studies

Emmanuel Corse, Christelle Tougard, Gaït Archambaud-Suard, Jean-François Agnèse, Françoise D. Messu Mandeng, Charles F. Bilong Bilong, David Duneau, Lucie Zinger, Rémi Chappaz, Charles C. Y. Xu, Emese Meglécz & Vincent Dubut
In diet metabarcoding analyses, insufficient taxonomic coverage of PCR primer sets generates false negatives that may dramatically distort biodiversity estimates. In this paper, we investigated the taxonomic coverage and complementarity of three cytochrome c oxidase subunit I gene (COI) primer sets based on in silico analyses and we conducted an in vivo evaluation using fecal and spider web samples from different invertivores, environments, and geographic locations. Our results underline the lack of predictability of both...

Data from: Integration and harmonization of trait data from plant individuals across heterogeneous sources

Tim P. Lenters, Andrew Henderson, Caroline M. Dracxler, Guilherme A. Elias, Suzanne Mogue Kamga, Thomas L. P. Couvreur & W. Daniel Kissling
Trait data represent the basis for ecological and evolutionary research and have relevance for biodiversity conservation, ecosystem management and earth system modelling. The collection and mobilization of trait data has strongly increased over the last decade, but many trait databases still provide only species-level, aggregated trait values (e.g. ranges, means) and lack the direct observations on which those data are based. Thus, the vast majority of trait data measured directly from individuals remains hidden and...

Local adaptation in thermal tolerance for a tropical butterfly across ecotone and rainforest habitats

Michel AK Dongmo, Rachid Hanna, Thomas B Smith, KKM Fiaboe, Abraham Fomena & Timothy C Bonebrake
Thermal adaptation to habitat variability can determine species vulnerability to environmental change. For example, physiological tolerance to naturally low thermal variation in tropical forests species may alter their vulnerability to climate change impacts, compared with open habitat species. However, the extent to which habitat-specific differences in tolerance derive from within-generation versus across-generation ecological or evolutionary processes are not well characterized. Here we studied thermal tolerance limits of a Central African butterfly (Bicyclus dorothea) across two...

Cocoa mirid attractiveness by different colour of trap

Hermine Mahot, Joseph R. Mahob, David R. Hall, Sarah E.J. Arnold, Apollin K. Fotso, Gertrude Membang, Nathalie Ewane, Adolph Kemga, Komi K.M. Fiaboe, Charles F.B. Bilong & Rachid Hanna
Cocoa mirids, Sahlbergella singularis and Distantiella theobroma, are the most economically important insect pests of cocoa in West and Central Africa, where they can cause up to 40% losses in cocoa yields. Sahlbergella singularis is the most common species in Cameroon and was therefore targeted in this study. During a two-year trial in 15 cocoa plantations in Ayos and Konye, in the Centre and Southwest regions of Cameroon respectively, the most effective colour – white,...

Asynchronous Saturation of the Carbon Sink in African and Amazonian tropical forests

Wannes Hubau, Simon Lewis, Oliver Phillips, Kofi Kofi Affum-Baffoe, Hans Hans Beeckman, Aida Cuni-Sanchez, Corneille Ewango, Sophie Fauset, Douglas Sheil, Bonaventure Sonké, Martin Sullivan, Terry Sunderland, Sean Thomas, Katharine Abernethy, Stephen Adu-Bredu, Christian Amani, Timothy Baker, Lindsay Banin, Fidèle Baya, Serge Begne, Amy Bennett, Fabrice Benedet, Robert Bitariho & Yannick Bocko
Data and R-code from Hubau W et al. 2020. 'Asynchronous Saturation of the Carbon Sink in African and Amazonian tropical forests'. Nature 579, 80-87. 2020. DOI: 10.1038/s41586-020-2035-0. ABSTRACT: Structurally intact tropical forests sequestered ~50% of global terrestrial carbon uptake over the 1990s and early 2000s, offsetting ~15% of anthropogenic CO2 emissions1-3. Climate-driven vegetation models typically predict that this tropical forest ‘carbon sink’ will continue for decades4,5. However, recent inventories of intact Amazonian forests show declining...

Effect of B-site Co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion

Edwin A Nforna, Edwin Akongnwi Nforna, Patrice Kenfack Tsobnang, Roussin Lontio Fomekong, Hypolite Mathias Kamta Tedjieukeng, John Ngolui Lambi & Julius Numbonui Ghogomu
Samples of cobalt-doped neodymium orthoferrite compounds, NdCoxFe1-xO3 (0.0 ≤ x ≤ 0.5) were synthesized via glycine auto-combustion between 250 – 300 °C and calcined at 500 °C for two hours. X-ray diffraction showed that all compounds had an orthorhombic perovskite structure with space group Pbnm. Increasing cobalt doping gradually reduced the lattice parameters and contracted the unit cell volume. Both X-ray diffraction and Scanning Electron Microscopy showed that the particles were spherical and in the...

Data from: Habitat segregation and ecological character displacement in cryptic African malaria mosquitoes

Billy Tene Fossog, Diego Ayala, Pelayo Acevedo, Pierre Kengne, Ignacio Ngomo Abeso Mebuy, Boris Makanga, Julie Magnus, Parfait Awono-Ambene, Flobert Njiokou, Marco Pombi, Christophe Antonio-Nkondjio, Christophe Paupy, Nora J. Besansky & Carlo Costantini
Understanding how divergent selection generates adaptive phenotypic and population diversification provides a mechanistic explanation of speciation in recently separated species pairs. Toward this goal, we sought ecological gradients of divergence between the cryptic malaria vectors Anopheles coluzzii and An. gambiae, and then looked for a physiological trait that may underlie such divergence. Using a large set of occurrence records and eco-geographical information, we built a distribution model to predict the predominance of the two species...

Data from: Intra-individual polymorphism in chloroplasts from NGS data: where does it come from and how to handle it?

N. Scarcelli, C. Mariac, T. L. P. Couvreur, A. Faye, D. Richard, F. Sabot, C. Berthouly-Salazar & Y. Vigouroux
Next generation sequencing allows access to a large quantity of genomic data. In plants, several studies used whole chloroplast genome sequences for inferring phylogeography or phylogeny. Even though the chloroplast is a haploid organelle, NGS plastome data identified a non negligible number of intra-individual polymorphic SNPs. Such observations could have several causes such as sequencing errors, the presence of heteroplasmy or transfer of chloroplast sequences in the nuclear and mitochondrial genomes. The occurrence of allelic...

Data from: Bushmeat genetics: setting up a reference framework for the DNA-typing of African forest bushmeat

Philippe Gaubert, Flobert Njiokou, Ayodeji Olayemi, Paolo Pagani, Sylvain Dufour, Emmanuel Danquah, Mac Elikem K. Nutsuakor, Gabriel Ngua, Alain-Didier Missoup, Pablo A. Tedesco, Rémy Dernat & Agostinho Antunes
The bushmeat trade in tropical Africa represents illegal, unsustainable off-takes of millions of tons of wild game – mostly mammals – per year. We sequenced four mitochondrial gene fragments (cyt b, COI, 12S, 16S) in >300 bushmeat items representing nine mammalian orders and 59 morphological species from five western and central African countries (Guinea, Ghana, Nigeria, Cameroon and Equatorial Guinea). Our objectives were to assess the efficiency of cross-species PCR amplification and to evaluate the...

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