Auteurs, date et publication :
Auteurs Michael S Caterino , Alexey K Tishechkin
Publication : ZooKeys
Date : 2025
Issue : 557
Pages : 59
Catégorie(s)
#⛔ No DOI found #CNRS #FORET NouraguesRésumé
Tropical forests are characterized by large carbon stocks and high biodiversity, but they are increasingly threatened by human activities. Since structure strongly influences the functioning and resilience of forest communities and ecosystems, it is important to quantify it at fine spatial scales. Here, we propose a new simulation-based approach, the “Canopy Constructor”, with which we quantified forest structure and biomass at two tropical forest sites, one in French Guiana, the other in Gabon. In a first step, the Canopy Constructor combines field inventories and airborne lidar scans to create virtual 3D representations of forest canopies that best fit the data. From those, it infers the forests' structure, including crown packing densities and allometric scaling relationships between tree dimensions. In a second step, the results of the first step are extrapolated to create virtual tree inventories over the whole lidar-scanned area. Across the French Guiana and Gabon plots, we reconstructed empirical canopies with a mean absolute error of 3.98 m [95% credibility interval: 3.02, 4.98], or 14.4%, and a small upwards bias of 0.66 m [−0.41, 1.8], or 2.7%. Height-stem diameter allometries were inferred with more precision than crown-stem diameter allometries, with generally larger heights at the Amazonian than the African site, but similar crown-stem diameter allometries. Plot-based aboveground biomass was inferred to be larger in French Guiana with 400.8 t ha−1 [366.2–437.9], compared to 302.2 t ha−1 in Gabon [267.8–336.8] and decreased to 299.8 t ha−1 [275.9–333.9] and 251.8 t ha−1 [206.7–291.7] at the landscape scale, respectively. Predictive accuracy of the extrapolation procedure had an RMSE of 53.7 t ha−1 (14.9%) at the 1 ha scale and 87.6 t ha−1 (24.2%) at the 0.25 ha scale, with a bias of −17.1 t ha−1 (−4.7%). This accuracy was similar to regression-based approaches, but the Canopy Constructor improved the representation of natural heterogeneity considerably, with its range of biomass estimates larger by 54% than regression-based estimates. The Canopy Constructor is a comprehensive inference procedure that provides fine-scale and individual-based reconstructions even in dense tropical forests. It may thus prove vital in the assessment and monitoring of those forests, and has the potential for a wider applicability, for example in the exploration of ecological and physiological relationships in space or the initialisation and calibration of forest growth models.
Auteurs, date et publication :
Auteurs Fabian Jörg Fischer , Nicolas Labrière , Grégoire Vincent , Bruno Hérault , Alfonso Alonso , Hervé Memiaghe , Pulchérie Bissiengou , David Kenfack , Sassan Saatchi , Jérôme Chave
Publication : Remote Sensing of Environment
Date : 2025
Volume : 251
Pages : 112056
Catégorie(s)
#ANR-Citation #CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs H van der Werff
Publication : Blumea-Biodiversity, Evolution and Biogeography of Plants
Date : 2025
Volume : 56
Issue : 3
Pages : 214-215
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Daniel A Truchado , José Manuel Diaz-Piqueras , Esperanza Gomez-Lucia , Ana Doménech , Borja Milá , Javier Pérez-Tris , Jonas Schmidt-Chanasit , Daniel Cadar , Laura Benítez
Publication : Viruses
Date : 2025
Volume : 11
Issue : 12
Pages : 1148
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Metagenomics is helping to expand the known diversity of viruses, especially of those with poorly studied hosts in remote areas. The Neotropical region harbors a considerable diversity of avian species that may play a role as both host and short-distance vectors of unknown viruses. Viral metagenomics of cloacal swabs from 50 Neotropical birds collected in French Guiana revealed the presence of four complete astrovirus genomes. They constitute an early diverging novel monophyletic clade within the Avastrovirus phylogeny, representing a putative new astrovirus species (provisionally designated as Avastrovirus 5) according to the International Committee on Taxonomy of Viruses (ICTV) classification criteria. Their genomic organization shares some characteristics with Avastrovirus but also with Mamastrovirus. The pan-astrovirus RT-PCR analysis of the cloacal samples of 406 wild Neotropical birds showed a community-level prevalence of 4.9% (5.1% in passerines, the highest described so far in this order of birds). By screening birds of a remote region, we expanded the known host range of astroviruses to the avian families Cardinalidae, Conopophagidae, Furnariidae, Thamnophilidae, Turdidae and Tyrannidae. Our results provide important first insights into the unexplored viral communities, the ecology, epidemiology and features of host-pathogen interactions that shape the evolution of avastroviruses in a remote Neotropical rainforest.
Auteurs, date et publication :
Auteurs Izaskun Fernández-Correa , Daniel A. Truchado , Esperanza Gomez-Lucia , Ana Doménech , Javier Pérez-Tris , Jonas Schmidt-Chanasit , Daniel Cadar , Laura Benítez
Publication : Scientific Reports
Date : 2025
Volume : 9
Issue : 1
Pages : 9513
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Holger Teichert , Stefan Dötterl , Dawn Frame , Alexander Kirejtshuk , Gerhard Gottsberger
Publication : Flora-Morphology, Distribution, Functional Ecology of Plants
Date : 2025
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Aims We aimed to identify a clinically useful biomarker using DNA methylation-based information to optimize individual treatment of patients with glioblastoma (GBM). Methods A six-CpG panel was identified by incorporating genome-wide DNA methylation data and clinical information of three distinct discovery sets and was combined using a risk-score model. Different validation sets of GBMs and lower-grade gliomas and different statistical methods were implemented for prognostic evaluation. An integrative analysis of multidimensional TCGA data was performed to molecularly characterize different risk tumors. Results The six-CpG risk-score signature robustly predicted overall survival (OS) in all discovery and validation cohorts and in a treatment-independent manner. It also predicted progression-free survival (PFS) in available patients. The multimarker epigenetic signature was demonstrated as an independent prognosticator and had better performance than known molecular indicators such as glioma-CpG island methylator phenotype (G-CIMP) and proneural subtype. The defined risk subgroups were molecularly distinct; high-risk tumors were biologically more aggressive with concordant activation of proangiogenic signaling at multimolecular levels. Accordingly, we observed better OS benefits of bevacizumab-contained therapy to high-risk patients in independent sets, supporting its implication in guiding usage of antiangiogenic therapy. Finally, the six-CpG signature refined the risk classification based on G-CIMP and MGMT methylation status. Conclusions The novel six-CpG signature is a robust and independent prognostic indicator for GBMs and is of promising value to improve personalized management.
Auteurs, date et publication :
Auteurs An-An Yin , Nan Lu , Amandine Etcheverry , Marc Aubry , Jill Barnholtz‐Sloan , Lu-Hua Zhang , Jean Mosser , Wei Zhang , Xiang Zhang , Yu-He Liu , Ya-Long He
Publication : CNS Neuroscience & Therapeutics
Date : 2025
Volume : 24
Issue : 3
Pages : 167-177
Catégorie(s)
#CNRS #EcoGenO #Université de RennesRésumé
Plants are colonized by a great diversity of microorganisms which form a microbiota and perform additional functions for their host. This microbiota can thus be considered a toolbox enabling plants to buffer local environmental changes, with a positive influence on plant fitness. In this context, the transmission of the microbiota to the progeny represent a way to ensure the presence of beneficial symbionts within the habitat. Examples of such transmission have been mainly described for seed transmission and concern a few pathogenic microorganisms. We investigated the transmission of symbiotic partners to plant progeny within clonal plant network.
Auteurs, date et publication :
Auteurs Nathan Vannier , Cendrine Mony , Anne-Kristel Bittebiere , Sophie Michon-Coudouel , Marine Biget , Philippe Vandenkoornhuyse
Publication : Microbiome
Date : 2018
Volume : 6
Issue : 1
Pages : 79
Catégorie(s)
#CNRS #EcoGenO #Université de RennesAuteurs, date et publication :
Auteurs Antoine Fouquet , VICTOR GOYANNES DILL Orrico , Raffael Ernst , Michel Blanc , QUENTIN Martinez , JEAN-PIERRE Vacher , MIGUEL TREFAUT Rodrigues , Paul Ouboter , Rawien Jairam , SANTIAGO Ron
Publication : Zootaxa
Date : 2025
Volume : 4052
Issue : 1
Pages : 39-64
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Csaba Csuzdi , Tomáš Pavlíček
Publication : Journal of Natural History
Date : 2025
Volume : 45
Issue : 27-28
Pages : 1759-1767