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| Author |
Brouard, O.; Céréghino, R.; Corbara, B.; Leroy, C.; Pelozuelo, L.; Dejean, A.; Carrias, J.-F. |
| Title |
Understorey environments influence functional diversity in tank-bromeliad ecosystems |
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Journal Article |
| Year |
2012 |
Publication |
Freshwater Biology |
Abbreviated Journal |
Freshw. Biol. |
| Volume |
57 |
Issue |
4 |
Pages |
815-823 |
| Keywords |
Food webs; French Guiana; Invertebrates; Microorganisms; Phytotelmata; Rainforest |
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A substantial fraction of the freshwater available in neotropical forests is impounded within the rosettes of bromeliads that form aquatic islands in a terrestrial matrix. The ecosystem functioning of bromeliads is known to be influenced by the composition of the contained community but it is not clear whether bromeliad food webs remain functionally similar against a background of variation in the understorey environment. We considered a broad range of environmental conditions, including incident light and incoming litter, and quantified the distribution of a very wide range of freshwater organisms (from viruses to macroinvertebrates) to determine the factors that influence the functional structure of bromeliad food webs in samples taken from 171 tank-bromeliads. We observed a gradient of detritus-based to algal-based food webs from the understorey to the overstorey. Algae, rotifers and collector and predatory invertebrates dominated bromeliad food webs in exposed areas, whereas filter-feeding insects had their highest densities in shaded forest areas. Viruses, bacteria and fungi showed no clear density patterns. Detritus decomposition is mainly due to microbial activity in understorey bromeliads where filter feeders are the main consumers of microbial and particulate organic matter (POM). Algal biomass may exceed bacterial biomass in sun-exposed bromeliads where amounts of detritus were lower but functional diversity was highest. Our results provide evidence that tank-bromeliads, which grow in a broad range of ecological conditions, promote aquatic food web diversity in neotropical forests. Moreover, although bromeliad ecosystems have been categorised as detritus-based systems in the literature, we show that algal production can support a non-detrital food web in these systems. © 2012 Blackwell Publishing Ltd. |
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Ecologie des Forêts de Guyane, UMR, CNRS 8172, Campus Agronomique, 97379 Kourou Cedex, France |
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00465070 (Issn) |
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Export Date: 21 March 2012; Source: Scopus; Coden: Fwbla; doi: 10.1111/j.1365-2427.2012.02749.x; Language of Original Document: English; Correspondence Address: Céréghino, R.; INP, UPS EcoLab (Laboratoire Ecologie Fonctionnelle et Environnement), Université de Toulouse, 118 Route de Narbonne, 31062 Toulouse, France; email: regis.cereghino@univ-tlse3.fr |
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EcoFoG @ webmaster @ |
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383 |
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Seipke, R.F.; Barke, J.; Ruiz-Gonzalez, M.X.; Orivel, J.; Yu, D.W.; Hutchings, M.I. |
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Fungus-growing Allomerus ants are associated with antibiotic-producing actinobacteria |
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Journal Article |
| Year |
2012 |
Publication |
Antonie van Leeuwenhoek, International Journal of General and Molecular Microbiology |
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Antonie Van Leeuwenhoek Int. J. Gen. Mol. Microbiol. |
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101 |
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2 |
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443-447 |
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Allomerus ants; Amycolatopsis; Ant-bacteria symbioses; Fungus-growing ants; Insect fungiculture; Streptomyces |
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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. |
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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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Hmimina, G.; Dufrêne, E.; Pontailler, J.-Y.; Delpierre, N.; Aubinet, M.; Caquet, B.; de Grandcourt, A.; Burban, B.; Flechard, C.; Granier, A.; Gross, P.; Heinesch, B.; Longdoz, B.; Moureaux, C.; Ourcival, J.-M.; Rambal, S.; Saint André, L.; Soudani, K. |
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Evaluation of the potential of MODIS satellite data to predict vegetation phenology in different biomes: An investigation using ground-based NDVI measurements |
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Journal Article |
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2013 |
Publication |
Remote Sensing of Environment |
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132 |
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145-158 |
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Crops; Deciduous forests; Evergreen forests; Ground-based NDVI; Modis; Phenology |
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Vegetation phenology is the study of the timing of seasonal events that are considered to be the result of adaptive responses to climate variations on short and long time scales. In the field of remote sensing of vegetation phenology, phenological metrics are derived from time series of optical data. For that purpose, considerable effort has been specifically focused on developing noise reduction and cloud-contaminated data removal techniques to improve the quality of remotely-sensed time series. Comparative studies between time series composed of satellite data acquired under clear and cloudy conditions and from radiometric data obtained with high accuracy from ground-based measurements constitute a direct and effective way to assess the operational use and limitations of remote sensing for predicting the main plant phenological events. In the present paper, we sought to explicitly evaluate the potential use of MODerate resolution Imaging Spectroradiometer (MODIS) remote sensing data for monitoring the seasonal dynamics of different types of vegetation cover that are representative of the major terrestrial biomes, including temperate deciduous forests, evergreen forests, African savannah, and crops. After cloud screening and filtering, we compared the temporal patterns and phenological metrics derived from in situ NDVI time series and from MODIS daily and 16-composite products. We also evaluated the effects of residual noise and the influence of data gaps in MODIS NDVI time series on the identification of the most relevant metrics for vegetation phenology monitoring. The results show that the inflexion points of a model fitted to a MODIS NDVI time series allow accurate estimates of the onset of greenness in the spring and the onset of yellowing in the autumn in deciduous forests (RMSE ≤ one week). Phenological metrics identical to those provided with the MODIS Global Vegetation Phenology product (MDC12Q2) are less robust to data gaps, and they can be subject to large biases of approximately two weeks or more during the autumn phenological transitions. In the evergreen forests, in situ NDVI time series describe the phenology with high fidelity despite small temporal changes in the canopy foliage. However, MODIS is unable to provide consistent phenological patterns. In crops and savannah, MODIS NDVI time series reproduce the general temporal patterns of phenology, but significant discrepancies appear between MODIS and ground-based NDVI time series during very localized periods of time depending on the weather conditions and spatial heterogeneity within the MODIS pixel. In the rainforest, the temporal pattern exhibited by a MODIS 16-day composite NDVI time series is more likely due to a pattern of noise in the NDVI data structure according to both rainy and dry seasons rather than to phenological changes. More investigations are needed, but in all cases, this result leads us to conclude that MODIS time series in tropical rainforests should be interpreted with great caution. © 2013 Elsevier Inc. |
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INRA, Unité Biogéochimie des Ecosystèmes Forestiers, Champenoux, France |
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Export Date: 21 February 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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467 |
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Aimene, Y.; Dorville, R.; Omrane, A. |
| Title |
Optimal control for trees trunk diameter estimation in rain forest ecology |
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Journal Article |
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2013 |
Publication |
Applied Mathematical Sciences |
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7 |
Issue |
17-20 |
Pages |
807-816 |
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Missing data; Optimal control; Tree trunk diameter |
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We study the optimal control question for an important mechanical problem related to tree trunk diameter variation in tropical forest ecology where some data are missing. Within a cost function, the control problem is formulated with a mechanical model that requires boundary conditions tosolve all equations. We give a characterization of the optimal measurement function for the tree trunk problem. |
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Laboratoire CEREGMIA EA 2440, Université Antilles-Guyane, I.E.S.G Campus de Trou-Biran, Route de Baduel, 97337 Cayenne, French Guiana |
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Export Date: 21 February 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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469 |
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Molto, Q.; Rossi, V.; Blanc, L. |
| Title |
Error propagation in biomass estimation in tropical forests |
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Journal Article |
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2013 |
Publication |
Methods in Ecology and Evolution |
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4 |
Issue |
2 |
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175-183 |
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Bayesian framework; Modelling; Redd; Uncertainty propagation |
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Reliable above-ground biomass (AGB) estimates are required for studies of carbon fluxes and stocks. However, there is a huge lack of knowledge concerning the precision of AGB estimates and the sources of this uncertainty. At the tree level, the tree height is predicted using the tree diameter at breast height (DBH) and a height sub-model. The wood-specific gravity (WSG) is predicted with taxonomic information and a WSG sub-model. The tree mass is predicted using the predicted height, the predicted WSG and the biomass sub-model. Our models were inferred with Bayesian methods and the uncertainty propagated with a Monte Carlo scheme. The uncertainties in the predictions of tree height, tree WSG and tree mass were neglected sequentially to quantify their contributions to the uncertainty in AGB. The study was conducted in French Guiana where long-term research on forest ecosystems provided an outstanding data collection on tree height, tree dynamics, tree mass and species WSG. We found that the uncertainty in the AGB estimates was found to derive primarily from the biomass sub-model. The models used to predict the tree heights and WSG contributed negligible uncertainty to the final estimate. Considering our results, a poor knowledge of WSG and the height-diameter relationship does not increase the uncertainty in AGB estimates. However, it could lead to bias. Therefore, models and databases should be used with care. This study provides a methodological framework that can be broadly used by foresters and plant ecologist. It provides the accurate confidence intervals associated with forest AGB estimates made from inventory data. When estimating region-scale AGB values (through spatial interpolation, spatial modelling or satellite signal treatment), the uncertainty of the forest AGB value in the reference forest plots has to be taken in account. We believe that in the light of the Reducing Emissions from Deforestation and Degradation debate, our method is a crucial step in monitoring carbon stocks and their spatio-temporal evolution. © 2012 The Authors. Methods in Ecology and Evolution © 2012 British Ecological Society. |
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CIRAD, UMR 'Ecologie des Forêts de Guyane', Kourou Cedex, 97 379, France |
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Export Date: 21 February 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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470 |
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Pavoine, S.; Marcon, E.; Ricotta, C. |
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‘Equivalent numbers’ for species, phylogenetic or functional diversity in a nested hierarchy of multiple scales |
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Journal Article |
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2016 |
Publication |
Methods in Ecology and Evolution |
Abbreviated Journal |
Methods in Ecology and Evolution |
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7 |
Issue |
10 |
Pages |
1152-1163 |
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alpha diversity; beta diversity; biodiversity; community ecology; community phylogenetics; diversity apportionment; gamma diversity; quadratic entropy |
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Many recent studies have searched to integrate species’ functions and phylogenies in the measurement of biodiversity. To obtain easily interpretable measures, some researchers recommended diversity indices expressed in terms of equivalent numbers of species: the number of equally likely and maximally dissimilar species needed to produce the given value of diversity. Then, biodiversity is often calculated at three scales: within communities (α diversity), among communities (β diversity) and in a region (γ diversity). These three scales are, however, insufficient to tackle the organization of biodiversity in space because, for most organisms, there is a nested hierarchy of multiple scales characterized by different patterns and processes, from the small neighbourhood to the biosphere. We developed methodologies for analysing species, functional, taxonomic or phylogenetic diversity in a hierarchy of multiple scales using equivalent numbers of species. As an example, we analysed the taxonomic and functional diversity of macroinvertebrate assemblages in the Loire River, France, at four levels: within sites (α diversity), among sites within geological regions (β1 diversity), among geological regions (β2 diversity) and at the river scale (γ diversity). The new hierarchical approaches of biodiversity revealed very low differences among sites within regions and among regions in terms of taxonomy and functional traits (size and diet), despite moderate, significant species turnover among geological regions. We compare our framework with those other authors have developed. We argue that different definitions of α, β, γ diversities are used in the literature reflecting different points of view on biodiversity. We make recommendations on how to normalize functional (or phylogenetic) dissimilarities among species to render sites and regions comparable, and discuss the pros and cons of our approach. The hierarchical approaches of biodiversity in terms of ‘equivalent numbers’ respond to current demands to obtain intuitive, easily interpretable components of biodiversity. The approaches we propose go beyond current developments by considering a hierarchy of spatial scales and unbalanced sampling design. They will provide powerful tools to detect the ecological and evolutionary processes that act differently at different scales. © 2016 The Authors. Methods in Ecology and Evolution © 2016 British Ecological Society |
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Department of Environmental Biology, University of Rome ‘La Sapienza’, Piazzale Aldo Moro 5, Rome, Italy |
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Export Date: 20 October 2016 |
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EcoFoG @ webmaster @ |
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697 |
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Gao, H.; Grüschow, S.; Barke, J.; Seipke, R.F.; Hill, L.M.; Orivel, J.; Yu, D.W.; Hutchings, M.; Goss, R.J.M. |
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Filipins: The first antifungal “weed killers” identified from bacteria isolated from the trap-ant |
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Journal Article |
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2014 |
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RSC Advances |
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RSC Adv. |
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4 |
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100 |
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57267-57270 |
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Anti-fungal |
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Allomerus ants ensure that they have sufficient nitrogen in their diet by trapping and consuming other insects. In order to construct their traps, like the more extensively studied leaf cutter ants, they employ fungal farming. Pest management within these fungal cultures has been speculated to be due to the ants' usage of actinomycetes capable of producing antifungal compounds, analogous to the leafcutter ant mutualism. Here we report the first identification of a series of antifungal compounds, the filipins, and their associated biosynthetic genes isolated from a bacterium associated with this system. |
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State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of ZoologyKunming, Yunnan, China |
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Royal Society of Chemistry |
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20462069 (Issn) |
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Export Date: 20 November 2014; Coden: Rscac; Correspondence Address: Goss, R.J.M.; School of Chemistry, University of St. AndrewsUnited Kingdom; Funding Details: 311848, EC, European Commission |
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567 |
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Tahiri, A.; Amissa Adima, A.; Adjé, F.A.; Amusant, N. |
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Pesticide effects and screening of extracts of Azadirachta Indica (A.) Juss. on the Macrotermes bellicosus rambur termite |
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Journal Article |
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2011 |
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Bois et Forets des Tropiques |
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Effet pesticide et screening des extraits de Azadirachta indica (A.) Juss. sur le termite Macroterme |
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65 |
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310 |
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79-88 |
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Azadirachta indica; Pesticide properties; Phytochemical screening; Termite |
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To recommend applications in the field of a naturally insecticide plant substance as an alternative to chemical control against termite attacks, several important prerequisites need to be satisfied to ensure its effectiveness. The toxicity, lethal dose, mode of action, persistence of insecticide effect and chemical composition of total aqueous, alcohol and hexane extracts of the leaves and seeds of the neem tree, Azadirachta indica, were tested with the Macrotermes bellicosus termite. The extracts were found to be highly toxic to termites on contact, killing the entire population tested. The insecticide effect of the extracts persisted from 2.4 to 4.2 days. The aqueous and hexane extracts were the most toxic (LD50 0.422±0.018 to 4,466±0,162 mg/l). Contact and inhalation were both essential to their effectiveness. The aqueous extract of seeds, which is the most active, is also capable of being transferred through the colony during social tasks. However, it seems to have an anti-appetent effect on termites and does not act by ingestion. It contains phenol compounds (tannins and flavonoids) and saponins. The hexane extract of seeds is oily and contains 11 fatty acids as well as terpenoids, flavonoids and saponins. |
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Cirad Laboratoire de Chimie du Bois, 34398 Montpellier Cedex 5, France |
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Export Date: 20 November 2012; Source: Scopus |
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EcoFoG @ webmaster @ |
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447 |
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Houel, E.; Nardella, F.; Jullian, V.; Valentin, A.; Vonthron-Sénécheau, C.; Villa, P.; Obrecht, A.; Kaiser, M.; Bourreau, E.; Odonne, G.; Fleury, M.; Bourdy, G.; Eparvier, V.; Deharo, E.; Stien, D. |
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Wayanin and guaijaverin, two active metabolites found in a Psidium acutangulum Mart. ex DC (syn. P. persoonii McVaugh) (Myrtaceae) antimalarial decoction from the Wayana Amerindians |
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Journal Article |
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2016 |
Publication |
Journal of Ethnopharmacology |
Abbreviated Journal |
Journal of Ethnopharmacology |
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187 |
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241-248 |
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Antimalarial; Cytokines; French guiana; Glycosylated flavonols; Psidium acutangulum; Traditional remedy |
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Ethnopharmacological relevance Psidium acutangulum Mart. ex DC is a small tree used by the Wayana Amerindians from the Upper-Maroni in French Guiana for the treatment of malaria. Aim of the study In a previous study, we highlighted the in vitro antiplasmodial, antioxidant and anti-inflammatory potential of the traditional decoction of P. acutangulum aerial parts. Our goal was then to investigate on the origin of the biological activity of the traditional remedy, and eventually characterize active constituents. Materials and methods Liquid-liquid extractions were performed on the decoction, and the antiplasmodial activity evaluated against chloroquine-resistant FcB1 ([3H]-hypoxanthine bioassay) and 7G8 (pLDH bioassay) P. falciparum strains, and on a chloroquine sensitive NF54 ([3H]-hypoxanthine bioassay) P. falciparum strain. The ethyl acetate fraction (D) was active and underwent bioguided fractionation. All the isolated compounds were tested on P. falciparum FcB1 strain. In vitro anti-inflammatory activity (IL-1β, IL-6, IL-8, TNFα) of the ethyl acetate fraction and of an anti-Plasmodium active compound, was concurrently assessed on LPS-stimulated human PBMC and NO secretion inhibition was measured on LPS stimulated RAW murine macrophages. Cytotoxicity of the fractions and pure compounds was measured on VERO cells, L6 mammalian cells, PBMCs, and RAW cells. Results Fractionation of the ethyl acetate soluble fraction (IC50 ranging from 3.4 to <1 μg/mL depending on the parasite strain) led to the isolation of six pure compounds: catechin and five glycosylated quercetin derivatives. These compounds have never been isolated from this plant species. Two of these compounds (wayanin and guaijaverin) were found to be moderately active against P. falciparum FcB1 in vitro (IC50 5.5 and 6.9 μM respectively). We proposed the name wayanin during public meetings organized in June 2015 in the Upper-Maroni villages, in homage to the medicinal knowledge of the Wayana population. At 50 μg/mL, the ethyl acetate fraction (D) significantly inhibited IL-1β secretion (-46%) and NO production (-21%), as previously observed for the decoction. The effects of D and guiajaverin (4) on the secretion of other cytokines or NO production were not significant. Conclusions The confirmed antiplasmodial activity of the ethyl acetate soluble fraction of the decoction and of the isolated compounds support the previous results obtained on the P. acutangulum decoction. The antiplasmodial activity might be due to a mixture of moderately active non-toxic flavonoids. The anti-inflammatory activities were less marked for ethyl acetate fraction (D) than for the decoction. © 2016 Elsevier Ireland Ltd. All rights reserved. |
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Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM), Observatoire Océanologique, Banyuls/Mer, France |
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Export Date: 20 May 2016 |
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EcoFoG @ webmaster @ |
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| Author |
Wagner, F.H.; Herault, B.; Bonal, D.; Stahl, C.; Anderson, L.O.; Baker, T.R.; Sebastian Becker, G.; Beeckman, H.; Boanerges Souza, D.; Cesar Botosso, P.; Bowman, D.M.J.S.; Bräuning, A.; Brede, B.; Irving Brown, F.; Julio Camarero, J.; Camargo, P.B.; Cardoso, F.C.G.; Carvalho, F.A.; Castro, W.; Koloski Chagas, R.; Chave, J.; Chidumayo, E.N.; Clark, D.A.; Regina Capellotto Costa, F.; Couralet, C.; Henrique Da Silva Mauricio, P.; Dalitz, H.; Resende De Castro, V.; Milani, J.E.D.F.; Consuelo De Oliveira, E.; De Souza Arruda, L.; Devineau, J.L.; Drew, D.M.; Dünisch, O.; Durigan, G.; Elifuraha, E.; Fedele, M.; Ferreira Fedele, L.; Figueiredo Filho, A.; Finger, C.A.G.; César Franco, A.; Jnior, L.F.; Galvão, F.; Gebrekirstos, A.; Gliniars, R.; Maurício Lima De Alencastro Graça, P.; Griffiths, A.D.; Grogan, J.; Guan, K.; Homeier, J.; Raquel Kanieski, M.; Khoon Kho, L.; Koenig, J.; Valerio Kohler, S.; Krepkowski, J.; Lemos-Filho, J.P.; Lieberman, D.; Eugene Lieberman, M.; Sergio Lisi, C.; Longhi Santos, T.; Ayala, J.L.L.; Eijji Maeda, E.; Malhi, Y.; Maria, V.R.B.; Marques, M.C.M.; Marques, R.; Maza Chamba, H.; Mbwambo, L.; Liana Lisboa Melgaço, K.; Angela Mendivelso, H.; Murphy, B.P.; O'Brien, J.J.; F. Oberbauer, S.; Okada, N.; Plissier, R.; Prior, L.D.; Alejandro Roig, F.; Ross, M.; Rodrigo Rossatto, D.; Rossi, V.; Rowland, L.; Rutishauser, E.; Santana, H.; Schulze, M.; Selhorst, D.; Rodrigues Silva, W.; Silveira, M.; Spannl, S.; Swaine, M.D.; Toledo, J.J.; Miranda Toledo, M.; Toledo, M.; Toma, T.; Tomazello Filho, M.; Ignacio Valdez Hernández, J.; Verbesselt, J.; Aparecida Vieira, S.; Vincent, G.; Volkmer De Castilho, C.; Volland, F.; Worbes, M.; Lea Bolzan Zanon, M.; Aragão, L.E.O.C. |
| Title |
Climate seasonality limits leaf carbon assimilation and wood productivity in tropical forests |
Type |
Journal Article |
| Year |
2016 |
Publication |
Biogeosciences |
Abbreviated Journal |
Biogeosciences |
| Volume |
13 |
Issue |
8 |
Pages |
2537-2562 |
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| Abstract |
The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements and 35 litter productivity measurements), their associated canopy photosynthetic capacity (enhanced vegetation index, EVI) and climate, we ask how carbon assimilation and aboveground allocation are related to climate seasonality in tropical forests and how they interact in the seasonal carbon cycle. We found that canopy photosynthetic capacity seasonality responds positively to precipitation when rainfall is < 2000ĝ€-mmĝ€-yrĝ'1 (water-limited forests) and to radiation otherwise (light-limited forests). On the other hand, independent of climate limitations, wood productivity and litterfall are driven by seasonal variation in precipitation and evapotranspiration, respectively. Consequently, light-limited forests present an asynchronism between canopy photosynthetic capacity and wood productivity. First-order control by precipitation likely indicates a decrease in tropical forest productivity in a drier climate in water-limited forest, and in current light-limited forest with future rainfall < 2000ĝ€-mmĝ€-yrĝ'1. Author(s) 2016. |
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College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom |
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Export Date: 20 May 2016 |
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EcoFoG @ webmaster @ |
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680 |
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