| Records |
| Author |
Marcon, E.; Scotti, I.; Herault, B.; Rossi, V.; Lang, G. |
Title  |
Generalization of the partitioning of Shannon diversity |
Type |
Journal Article |
| Year |
2014 |
Publication |
PLoS ONE |
Abbreviated Journal |
PLoS ONE |
| Volume |
9 |
Issue |
3 |
Pages |
e90289 |
| Keywords |
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| Abstract |
Traditional measures of diversity, namely the number of species as well as Simpson's and Shannon's indices, are particular cases of Tsallis entropy. Entropy decomposition, i.e. decomposing gamma entropy into alpha and beta components, has been previously derived in the literature. We propose a generalization of the additive decomposition of Shannon entropy applied to Tsallis entropy. We obtain a self-contained definition of beta entropy as the information gain brought by the knowledge of each community composition. We propose a correction of the estimation bias allowing to estimate alpha, beta and gamma entropy from the data and eventually convert them into true diversity. We advocate additive decomposition in complement of multiplicative partitioning to allow robust estimation of biodiversity. © 2014 Marcon et al. |
| Address |
INRA, UMR 518 Math. Info. Appli, Paris, France |
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| Publisher |
Public Library of Science |
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19326203 (Issn) |
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Export Date: 18 April 2014; Source: Scopus; Art. No.: e90289; Coden: Polnc; Language of Original Document: English |
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EcoFoG @ webmaster @ |
Serial |
538 |
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| Author |
Dutech, C.; Joly, H.I.; Jarne, P. |
| Title |
Gene flow, historical population dynamics and genetic diversity within French Guianan populations of a rainforest tree species, Vouacapoua americana |
Type |
Journal Article |
| Year |
2004 |
Publication |
Heredity |
Abbreviated Journal |
Heredity |
| Volume |
92 |
Issue |
2 |
Pages |
69-77 |
| Keywords |
bottleneck; climatic change; extinction-recolonization; microsatellite; neotropical rainforest; pollen and seed dispersal |
| Abstract |
Both gene flow and historical events influence the genetic diversity of natural populations. One way to understand their respective impact is to analyze population genetic structure at large spatial scales. We studied the distribution of genetic diversity of 17 populations of Vouacapoua americana (Caesalpiniaceae) in French Guiana, using nine micro satellite loci. Low genetic diversity was observed within populations, with a mean allelic richness and gene diversity of 4.1 and 0.506, respectively, which could be due to low effective population size and/or past bottlenecks. Using the regression between F-st/(1-F-st), estimated between pairs of populations, and the logarithm of the geographical distance, the spatial genetic structure can partly be explained by isolation-by-distance and limited gene flow among populations. This result is in agreement with the species' biology, including seed and pollen dispersal by rodents and insects, respectively. In contrast, no clear genetic signal of historical events was found when examining genetic differentiation among populations in relation to biogeographical hypotheses or by testing for bottlenecks within populations. Our conclusion is that nuclear spatial genetic structure of V. americana, at the geographic scale of French Guiana, is better explained by gene flow rather than by historical events. |
| Address |
Cirad Foret Silvolab, Lab Genet & Ecol Mol, F-97387 Kourou, France, Email: cdutech@bordeaux.inra.fr |
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NATURE PUBLISHING GROUP |
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0018-067X |
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ISI:000188431700003 |
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no |
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EcoFoG @ eric.marcon @ |
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240 |
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| Author |
Veron, V.; Caron, H.; Degen, B. |
| Title |
Gene flow and mating system of the tropical tree Sextonia rubra |
Type |
Journal Article |
| Year |
2005 |
Publication |
Silvae Genetica |
Abbreviated Journal |
Silvae Genet. |
| Volume |
54 |
Issue |
6 |
Pages |
275-280 |
| Keywords |
genetic diversity; gene flow; heterozygosity; microsatellites; mixed mating; tropical tree; twogener |
| Abstract |
In this paper we report a study of the mating system and gene flow of Sextonia rubra, a hermaphroditic, insect pollinated tropical tree species with a geographic distribution in the Guyana Plateau and the Amazon. Using five microsatellites we analysed 428 seeds of 27 open pollinated families at the experimental site “Paracou” in French Guiana. We observed, compared to other tropical tree species, a high level of genetic diversity. We estimated parameters of the mating system and gene flow by using the mixed mating model and the TwoGener approach. The estimated multilocus outcrossing rate, t(m), was 0.992 indicating nearly complete outcrossing. A significant level of biparental inbreeding and a:small proportion. of full-sibs were estimated for the 27 seed arrays. The differentiation of allelic frequencies among the pollen pools was (Phi(FT) = 0.061. We estimated mean pollen dispersal distances between 65 m and 89 m according to the dispersal models used. The joint estimation of pollen dispersal and density of reproductive trees gave an effective density estimate of 2.1-2.2 trees/ha. |
| Address |
INRA, UMR, ECOFOG, Kourou 9738, French Guiana, Email: b.degen@holz.uni-hamburg.de |
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J D SAUERLANDERS VERLAG |
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0037-5349 |
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ISI:000235239400005 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
182 |
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| Author |
Rockwell, C.A.; Kainer, K.A.; Staudhammer, C.L.; Baraloto, C. |
| Title |
Future crop tree damage in a certified community forest in southwestern Amazonia |
Type |
Journal Article |
| Year |
2007 |
Publication |
Forest Ecology and Management |
Abbreviated Journal |
For. Ecol. Manage. |
| Volume |
242 |
Issue |
2-3 |
Pages |
108-118 |
| Keywords |
bamboo; community forest management; forest certification; Guadua; liana; marking; reduced-impact logging; RIL; timber management; tropical forest |
| Abstract |
Field studies in Acre, Brazil assessed logging impacts of a certified community timber management project. The main objectives of the study were: (1) to determine if damage incidence to future crop trees (FCTs; >= 20 cm diameter at breast height (dbh)) differs between (a) forest with and without bamboo (Guadua spp.), and (b) trees with and without lianas; (2) to what extent harvesting can be conducted more intensely (m(3)ha(-1)), without incurring greater FCT damage; and (3) to what extent marking diminishes FCT damage. Full inventories of FCTs of 50 commercial species complexes were conducted before and after logging in 50 m-radius zones of impact around each designated harvest tree in three 10 ha (200 m x 500 m) logging blocks. We also mapped all forested areas potentially influenced by logging, including skid trails, log landings and felling gaps, throughout the 30 ha logged. More than 28% of the forest area was disturbed by logging, with 12.1% in skid trails and 16.8% in gap clearings, indicating that the forest gap mosaic can be significantly altered even when reduced-impact logging guidelines are followed. Overall, 15% of FCTs inventoried were damaged. Damage rates were not significantly reduced by marking treatment, location in bamboo-dominated forest, or liana load on FCT damage. Harvest intensity did not influence the probability of FCT damage. For future studies, it would be prudent to address impacts of timber extraction on other livelihood activities, such as non-timber forest product collection, particularly in such regions as the Brazilian Amazon, where many communities are attempting to integrate a suite of income-generating activities. (C) 2007 Elsevier B.V. All rights reserved. |
| Address |
Univ Florida, Sch Forest Resources & Conservat, Gainesville, FL 32611 USA, Email: crockwel@ufl.edu |
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ELSEVIER SCIENCE BV |
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0378-1127 |
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| Notes |
ISI:000246268100003 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
217 |
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| Author |
Seipke, R.F.; Barke, J.; Ruiz-Gonzalez, M.X.; Orivel, J.; Yu, D.W.; Hutchings, M.I. |
| Title |
Fungus-growing Allomerus ants are associated with antibiotic-producing actinobacteria |
Type |
Journal Article |
| Year |
2012 |
Publication |
Antonie van Leeuwenhoek, International Journal of General and Molecular Microbiology |
Abbreviated Journal |
Antonie Van Leeuwenhoek Int. J. Gen. Mol. Microbiol. |
| Volume |
101 |
Issue |
2 |
Pages |
443-447 |
| Keywords |
Allomerus ants; Amycolatopsis; Ant-bacteria symbioses; Fungus-growing ants; Insect fungiculture; Streptomyces |
| Abstract |
Fungus-growing attine ants use natural-product antibiotics produced by mutualist actinobacteria as 'weedkillers' in their fungal gardens. Here we report for the first time that fungus-growing Allomerus ants, which lie outside the tribe Attini, are associated with antifungal-producing actinobacteria, which offer them protection against non-cultivar fungi isolated from their ant-plants. © 2011 Springer Science+Business Media B.V. |
| Address |
State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650223, China |
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00036072 (Issn) |
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Export Date: 21 March 2012; Source: Scopus; Coden: Aljma; doi: 10.1007/s10482-011-9621-y; Language of Original Document: English; Correspondence Address: Hutchings, M.I.; School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom; email: m.hutchings@uea.ac.uk |
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no |
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EcoFoG @ webmaster @ |
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385 |
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| Author |
Jaouen, G.; Sagne, A.; Buyck, B.; Decock, C.; Louisanna, E.; Manzi, S.; Baraloto, C.; Roy, M.; Schimann, H. |
| Title |
Fungi of French Guiana gathered in a taxonomic, environmental and molecular dataset |
Type |
Journal Article |
| Year |
2019 |
Publication |
Scientific data |
Abbreviated Journal |
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| Volume |
6 |
Issue |
206 |
Pages |
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| Abstract |
In Amazonia, the knowledge about Fungi remains patchy and biased towards accessible sites. This is particularly the case in French Guiana where the existing collections have been confined to few coastal localities. Here, we aimed at filling the gaps of knowledge in undersampled areas of this region, particularly focusing on the Basidiomycota. From 2011, we comprehensively collected fruiting-bodies with a stratified and reproducible sampling scheme in 126 plots. Sites of sampling reflected the main forest habitats of French Guiana in terms of soil fertility and topography. The dataset of 5219 specimens gathers 245 genera belonging to 75 families, 642 specimens are barcoded. The dataset is not a checklist as only 27% of the specimens are identified at the species level but 96% are identified at the genus level. We found an extraordinary diversity distributed across forest habitats. The dataset is an unprecedented and original collection of Basidiomycota for the region, making specimens available for taxonomists and ecologists. The database is publicly available in the GBIF repository ( https://doi.org/10.15468/ymvlrp ). |
| Address |
Department of Biological Science, Florida International University, FL, Miami, 33199, United States |
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Export Date: 28 October 2019 |
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no |
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EcoFoG @ webmaster @ |
Serial |
891 |
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Perrot, T.; Schwartz, M.; Saiag, F.; Salzet, G.; Dumarçay, S.; Favier, F.; Gérardin, P.; Girardet, J.-M.; Sormani, R.; Morel-Rouhier, M.; Amusant, N.; Didierjean, C.; Gelhaye, E. |
| Title |
Fungal Glutathione Transferases as Tools to Explore the Chemical Diversity of Amazonian Wood Extractives |
Type |
Journal Article |
| Year |
2018 |
Publication |
ACS Sustainable Chem. Eng. |
Abbreviated Journal |
ACS Sustainable Chemistry & Engineering |
| Volume |
6 |
Issue |
10 |
Pages |
13078-13085 |
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| Abstract |
The natural durability of wood is linked to its chemical composition and in particular the presence of metabolites called extractives that often possess chemical reactivity. For dealing with these compounds, wood degraders have developed detoxification systems usually involving enzyme families. Among these enzymes, glutathione transferases (GSTs) are involved in the decrease of the reactivity of toxic compounds. In this study, the hypothesis that the detoxification systems of wood decaying fungi could be indicators of the chemical reactivity of wood extracts has been tested. This approach has been evaluated using 32 wood extracts coming from French Guiana species, testing their antimicrobial ability, antioxidative properties, and reactivity against six GSTs from the white rot Trametes versicolor. From the obtained data, a significant correlation between the antimicrobial and antioxidative properties of the tested wood extracts and GST interactions was established. In addition, the chemical analysis performed on one of the most reactive extracts (an acetonic extract of Bagassa guianensis) has demonstrated oxyresveratrol as a major constituent. We were able to cocrystallize one GST with this commercially interesting compound. Taken together, the presented data support the hypothesis that detoxifying enzymes could be used to identify the presence of molecules of industrial interest in wood extracts. |
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American Chemical Society |
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doi: 10.1021/acssuschemeng.8b02636 |
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no |
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EcoFoG @ webmaster @ |
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854 |
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Herault, B.; Bachelot, B.; Poorter, L.; Rossi, V.; Bongers, F.; Chave, J.; Paine, C.E.T.; Wagner, F.; Baraloto, C. |
| Title |
Functional traits shape ontogenetic growth trajectories of rain forest tree species |
Type |
Journal Article |
| Year |
2011 |
Publication |
Journal of Ecology |
Abbreviated Journal |
J. Ecol. |
| Volume |
99 |
Issue |
6 |
Pages |
1431-1440 |
| Keywords |
Bayesian modelling; Functional traits; Growth modelling; Leaf economics; Leaf-height-seed strategy; Plant development and life-history traits; Plant strategy; Stem economics; Tropical rain forest |
| Abstract |
1.Functional traits are posited to explain interspecific differences in performance, but these relationships are difficult to describe for long-lived organisms such as trees, which exhibit strong ontogenetic changes in demographic rates. Here, we use a size-dependent model of tree growth to test the extent to which of 17 functional traits related to leaf and stem economics, adult stature and seed size predict the ontogenetic trajectory of tree growth. 2.We used a Bayesian modelling framework to parameterize and contrast three size-dependent diameter growth models using 16years of census data from 5524 individuals of 50 rain forest tree species: a size-dependent model, a size-dependent model with species-specific parameters and a size-dependent model based on functional traits. 3.Most species showed clear hump-shaped ontogenetic growth trajectories and, across species, maximum growth rate varied nearly tenfold, from 0.58 to 5.51mmyear-1. Most species attained their maximum growth at 60% of their maximum size, whereas the magnitude of ontogenetic changes in growth rate varied widely among species. 4.The Trait-Model provided the best compromise between explained variance and model parsimony and needed considerably fewer parameters than the model with species terms. 5.Stem economics and adult stature largely explained interspecific differences in growth strategy. Maximum absolute diameter growth rates increased with increasing adult stature and leaf δ13C and decreased with increasing wood density. Species with light wood had the greatest potential to modulate their growth, resulting in hump-shaped ontogenetic growth curves. Seed size and leaf economics, generally thought to be of paramount importance for plant performance, had no significant relationships with the growth parameters. 6.Synthesis. Our modelling approach offers a promising way to link demographic parameters to their functional determinants and hence to predict growth trajectories in species-rich communities with little parameter inflation, bridging the gap between functional ecology and population demography. © 2011 The Authors. Journal of Ecology © 2011 British Ecological Society. |
| Address |
Department of Biology, University of Florida, Gainesville, FL 32611, United States |
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00220477 (Issn) |
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Export Date: 21 October 2011; Source: Scopus; Coden: Jecoa; doi: 10.1111/j.1365-2745.2011.01883.x; Language of Original Document: English; Correspondence Address: Hérault, B.; Université des Antilles et de la Guyane, UMR Ecologie des Forêts de Guyane, 97387 Kourou Cedex, France; email: bruno.herault@ecofog.gf |
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no |
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EcoFoG @ webmaster @ |
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342 |
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Paine, C.E.T.; Baraloto, C.; Chave, J.; Herault, B. |
| Title |
Functional traits of individual trees reveal ecological constraints on community assembly in tropical rain forests |
Type |
Journal Article |
| Year |
2011 |
Publication |
Oikos |
Abbreviated Journal |
Oikos |
| Volume |
120 |
Issue |
5 |
Pages |
720-727 |
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| Abstract |
Niche differentiation and ecological filtering are primary ecological processes that shape community assembly, but their relative importance remains poorly understood. Analyses of the distributions of functional traits can provide insight into the community structure generated by these processes. We predicted the trait distributions expected under the ecological processes of niche differentiation and environmental filtering, then tested these predictions with a dataset of 4672 trees located in nine 1-ha plots of tropical rain forest in French Guiana. Five traits related to leaf function (foliar N concentration, chlorophyll content, toughness, tissue density and specific leaf area), and three traits related to stem function (trunk sapwood density, branch sapwood density, and trunk bark thickness), as well as laminar surface area, were measured on every individual tree. There was far more evidence for environmental filtering than for niche differentiation in these forests. Furthermore, we contrasted results from species-mean and individual-level trait values. Analyses that took within-species trait variation into account were far more sensitive indicators of niche differentiation and ecological filtering. Species-mean analyses, by contrast, may underestimate the effects of ecological processes on community assembly. Environmental filtering appeared somewhat more intense on leaf traits than on stem traits, whereas niche differentiation affected neither strongly. By accounting for within-species trait variation, we were able to more properly consider the ecological interactions among individual trees and between individual trees and their environment. In so doing, our results suggest that the ecological processes of niche differentiation and environmental filtering may be more pervasive than previously believed. |
| Address |
[Paine, C. E. Timothy] ENGREF, UMR Ecol Forets Guyane, Kourou 97387, French Guiana, Email: timothy.paine@ieu.uzh.ch |
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Wiley-Blackwell |
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0030-1299 |
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ISI:000289740200008 |
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no |
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EcoFoG @ webmaster @ |
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313 |
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Flores, O.; Herault, B.; Delcamp, M.; Garnier, É.; Gourlet-Fleury, S. |
| Title |
Functional traits help predict post-disturbance demography of tropical trees |
Type |
Journal Article |
| Year |
2014 |
Publication |
PLoS ONE |
Abbreviated Journal |
PLoS ONE |
| Volume |
9 |
Issue |
9 |
Pages |
e105022 |
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| Abstract |
How tropical tree species respond to disturbance is a central issue of forest ecology, conservation and resource management. We define a hierarchical model to investigate how functional traits measured in control plots relate to the population change rate and to demographic rates for recruitment and mortality after disturbance by logging operations. Population change and demographic rates were quantified on a 12-year period after disturbance and related to seven functional traits measured in control plots. The model was calibrated using a Bayesian Network approach on 53 species surveyed in permanent forest plots (37.5 ha) at Paracou in French Guiana. The network analysis allowed us to highlight both direct and indirect relationships among predictive variables. Overall, 89% of interspecific variability in the population change rate after disturbance were explained by the two demographic rates, the recruitment rate being the most explicative variable. Three direct drivers explained 45% of the variability in recruitment rates, including leaf phosphorus concentration, with a positive effect, and seed size and wood density with negative effects. Mortality rates were explained by interspecific variability in maximum diameter only (25%). Wood density, leaf nitrogen concentration, maximum diameter and seed size were not explained by variables in the analysis and thus appear as independent drivers of post-disturbance demography. Relationships between functional traits and demographic parameters were consistent with results found in undisturbed forests. Functional traits measured in control conditions can thus help predict the fate of tropical tree species after disturbance. Indirect relationships also suggest how different processes interact to mediate species demographic response. |
| Address |
Centre d'Écologie Fonctionnelle et Évolutive, CNRS – UMR 5175Montpellier, France |
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Public Library of Science |
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19326203 (Issn) |
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Export Date: 7 October 2014; Coden: Polnc; Correspondence Address: Flores, O.; Cirad – Université de la Réunion, UMR PVBMT, 7 chemin de l'IRAT, France |
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no |
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EcoFoG @ webmaster @ |
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562 |
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