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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 (up) 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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Notes 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 Approved no
Call Number EcoFoG @ webmaster @ Serial 385
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Author Tindo, M.; Mbenoun Masse, P.S.; Kenne, M.; Mony, R.; Orivel, J.; Doumtsop Fotio, A.; Fotso Kuaté, A.; Djiéto-Lordon, C.; Fomena, A.; Estoup, A.; Dejean, A.; Foucaud, J.
Title Current distribution and population dynamics of the little fire ant supercolony in cameroon Type Journal Article
Year 2012 Publication Insectes Sociaux Abbreviated Journal Insectes Sociaux
Volume 59 Issue (up) 2 Pages 175-182
Keywords Auropunctata; Dispersion; Invasive ants; Reproduction strategy; Unicoloniality; Wasmannia
Abstract The little fire ant, Wasmannia auropunctata, is native to Central America, but has been introduced into many parts of the world. We examined the current distribution of W. auropunctata in Cameroon, tested for aggression between workers from different parts of the country, and examined the genotypes of workers, queens, and males to evaluate the mating system. We found W. auropunctata at 36 sites in three provinces (Centre, East, and South). We found W. auropunctata only in human-disturbed habitats. Its spread appears to be primarily human mediated. Aggressive behaviour was almost non-existent between workers from different sites, indicating that there is only one supercolony in Cameroon. Our genetic analysis found that only one male/female pair of clones was introduced into Cameroon, probably from Gabon. No new male clonal lineage was identified, whereas new sexually derived female clonal lineages were noted. Apart from the genotype of the founding queen, which was well distributed but generally not dominant, a new clonal queen genotype emerged and was both omnipresent and dominant at most sites. These results may be useful in the development of management strategies. © International Union for the Study of Social Insects (IUSSI) 2011.
Address Laboratoire Evolution Genome Speciation, Centre National de la Recherche Scientifique, Avenue de la Terrasse, F 91198 Gif sur Yvette, France
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ISSN 00201812 (Issn) ISBN Medium
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Notes Export Date: 24 April 2012; Source: Scopus; Coden: Insoa; doi: 10.1007/s00040-011-0202-x; Language of Original Document: English; Correspondence Address: Tindo, M.; Département de Biologie des Organismes Animaux, Faculté des Sciences, Université de Douala, BP 24157 Douala, Cameroon; email: tindodouala@yahoo.com Approved no
Call Number EcoFoG @ webmaster @ Serial 392
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Author Fouquet, A.; Ledoux, J.-B.; Dubut, V.; Noonan, B.P.; Scotti, I.
Title The interplay of dispersal limitation, rivers, and historical events shapes the genetic structure of an Amazonian frog Type Journal Article
Year 2012 Publication Biological Journal of the Linnean Society Abbreviated Journal Biol. J. Linn. Soc.
Volume 106 Issue (up) 2 Pages 356-373
Keywords Amazonia; Amphibian; Gene flow; Microsatellites; Mitochondrial DNA; Spatial genetic structure
Abstract Disentangling the impact of landscape features such as rivers and historical events on dispersal is a challenging but necessary task to gain a comprehensive picture of the evolution of diverse biota such as that found in Amazonia. Adenomera andreae, a small, territorial, terrestrial frog species of the Amazonian forest represents a good model for such studies. We combined cytochromeb sequences with 12 microsatellites to investigate the genetic structure at two contrasted spatial scales in French Guiana: along a ∼6-km transect, to evaluate dispersal ability, and between paired bank populations along a ∼65-km stretch of the Approuague river, to test the effect of rivers as barriers to dispersal. We observed significant spatial genetic structure between individuals at a remarkably small geographical scale, and conclude that the species has a restricted dispersal ability that is probably tied to its life-history traits. Mitochondrial and microsatellite data also indicate a high level of differentiation among populations on opposite banks of the river, and, in some cases, among populations on the same riverbank. These results suggest that the observed population structure in A.andreae is the result of restricted dispersal abilities combined with the action of rivers and Quaternary population isolation. Given that Amazonia hosts a great portion of anurans, as well as other small vertebrates, that display life-history traits comparable with A.andreae, we argue that our analyses provide new insights into the complex interactions among evolutionary processes shaping Amazonian biodiversity. © 2012 The Linnean Society of London.
Address INRA, UMR ECOFOG, Campus agronomique, Avenue de France, BP 709, 97387 Kourou, French Guiana, France
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Notes Export Date: 2 May 2012; Source: Scopus; Coden: Bjlsb; doi: 10.1111/j.1095-8312.2012.01871.x; Language of Original Document: English; Correspondence Address: Fouquet, A.; Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo, Caixa Postal 11461, CEP 05422-970, São Paulo, Brazil; email: fouquet.antoine@gmail.com Approved no
Call Number EcoFoG @ webmaster @ Serial 397
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Author Lipshutz, B.H.; Taft, B.R.; Abela, A.R.; Ghorai, S.; Krasovskiy, A.; Duplais, C.
Title Catalysis in the service of green chemistry: Nobel prize-winning palladium-catalysed cross-couplings, run in water at room temperature Type Journal Article
Year 2012 Publication Platinum Metals Review Abbreviated Journal Platinum Met. Rev.
Volume 56 Issue (up) 2 Pages 62-74
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Abstract Palladium-catalysed cross-couplings, in particular Heck, Suzuki-Miyaura and Negishi reactions developed over three decades ago, are routinely carried out in organic solvents. However, alternative media are currently of considerable interest given an increasing emphasis on making organic processes 'greener'; for example, by minimising organic waste in the form of organic solvents. Water is the obvious leading candidate in this regard. Hence, this review focuses on the application of micellar catalysis, in which a 'designer' surfactant enables these award-winning coupling reactions to be run in water at room temperature. © 2012 Johnson Matthey.
Address UMR-CNRS Ecofog, Institut Pasteur de la Guyane, 23 Avenue Pasteur, 97306 Cayenne, France
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Notes Cited By (since 1996): 1; Export Date: 15 May 2012; Source: Scopus; Coden: Ptmra; doi: 10.1595/147106712X629761; Language of Original Document: English; Correspondence Address: Lipshutz, B.H.; Department of Chemistry, University of California, Santa Barbara, CA 93106, United States; email: lipshutz@chem.ucsb.edu Approved no
Call Number EcoFoG @ webmaster @ Serial 400
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Author Letort, V.; Heuret, P.; Zalamea, P.-C.; De Reffye, P.; Nicolini, E.
Title Analysing the effects of local environment on the source-sink balance of Cecropia sciadophylla: A methodological approach based on model inversion Type Journal Article
Year 2012 Publication Annals of Forest Science Abbreviated Journal Ann. Forest Sci.
Volume 69 Issue (up) 2 Pages 167-180
Keywords Cecropia; Functional-structural model; Model inversion; Morphology; Trophic competition
Abstract Context Functional-structural models (FSM) of tree growth have great potential in forestry, but their development, calibration and validation are hampered by the difficulty of collecting experimental data at organ scale for adult trees. Due to their simple architecture and morphological properties, “model plants” such as Cecropia sciadophylla are of great interest to validate new models and methodologies, since exhaustive descriptions of their plant structure and mass partitioning can be gathered. Aims Our objective was to develop a model-based approach to analysing the influence of environmental conditions on the dynamics of trophic competition within C. sciadophylla trees. Methods We defined an integrated environmental factor that includes meteorological medium-frequency variations and a relative index representing the local site conditions for each plant. This index is estimated based on model inversion of the GreenLab FSM using data from 11 trees for model calibration and 7 trees for model evaluation. Results The resulting model explained the dynamics of biomass allocation to different organs during the plant growth, according to the environmental pressure they experienced. Perspectives By linking the integrated environmental factor to a competition index, an extension of the model to the population level could be considered. © INRA and Springer Science+Business Media B.V. 2011.
Address UMR ECOFOG Campus Agronomique, INRA, BP 316, 97379 Kourou cedex, French Guiana
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Notes Cited By (since 1996): 1; Export Date: 20 June 2012; Source: Scopus; Coden: Afosf; doi: 10.1007/s13595-011-0131-x; Language of Original Document: English; Correspondence Address: Letort, V.; Department of Applied Mathematics and Systems (MAS), Ecole Centrale Paris, Grande voie des Vignes, Chatenay-Malabry 92295, France; email: veronique.letort@centraliens.net Approved no
Call Number EcoFoG @ webmaster @ Serial 405
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Author Rifflet, A.; Gavalda, S.; Téné, N.; Orivel, J.; Leprince, J.; Guilhaudis, L.; Génin, E.; Vétillard, A.; Treilhou, M.
Title Identification and characterization of a novel antimicrobial peptide from the venom of the ant Tetramorium bicarinatum Type Journal Article
Year 2012 Publication Peptides Abbreviated Journal
Volume 38 Issue (up) 2 Pages 363-370
Keywords Amp; Ant venom; Antibacterial peptide; Bicarinalin; Esi-Ms/Ms; Staphylococcus; Tetramorium bicarinatum
Abstract A novel antimicrobial peptide, named Bicarinalin, has been isolated from the venom of the ant Tetramorium bicarinatum. Its amino acid sequence has been determined by de novo sequencing using mass spectrometry and by Edman degradation. Bicarinalin contained 20 amino acid residues and was C-terminally amidated as the majority of antimicrobial peptides isolated to date from insect venoms. Interestingly, this peptide had a linear structure and exhibited no meaningful similarity with any known peptides. Antibacterial activities against Staphylococcus aureus and S. xylosus strains were evaluated using a synthetic replicate. Bicarinalin had a potent and broad antibacterial activity of the same magnitude as Melittin and other hymenopteran antimicrobial peptides such as Pilosulin or Defensin. Moreover, this antimicrobial peptide has a weak hemolytic activity compared to Melittin on erythrocytes, suggesting potential for development into an anti-infective agent for use against emerging antibiotic-resistant pathogens. © 2012 Elsevier Inc.
Address ThermoFisher Scientific, 16 avenue du Québec, 91963 Courtaboeuf, France
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Notes Export Date: 15 January 2013; Source: Scopus Approved no
Call Number EcoFoG @ webmaster @ Serial 456
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Author Barabe, D.; Lacroix, C.; Gibernau, M.
Title Developmental floral morphology of Syngonium in the context of the tribe Caladieae (Araceae) Type Journal Article
Year 2012 Publication Willdenowia – Annals of the Botanic Garden and Botanical Museum Berlin-Dahlem Abbreviated Journal
Volume 42 Issue (up) 2 Pages 297-305
Keywords Aroids; Inflorescence; Phylogeny; Oxalate Crystals; Flower
Abstract The floral development of Syngonium angustatum is analysed in the context of a recently published molecular phylogeny of the Araceae. The initiation of discoid floral primordia occurs acropetally on the surface of the inflorescence. Female flowers, atypical bisexual flowers, sterile male flowers and male flowers are inserted on the same phyllotactic spirals on the spadix. Stamen primordia are initiated simultaneously on the periphery of more or less circular floral primordia. There are four stamens per flower (rarely three). In a synandrium, the fusion of stamens occurs very early during their developmental cycle. In some flowers one or two stamens remain free. The staminodes are also initiated on the periphery of the discoid floral primordium and their number varies from four to six. The growth of the fused staminodes will eventually form a longitudinal cavity in the centre of the mature synandrode. On the synandrodes located near the female zone, one or two staminodes remain free during development. No atypical bisexual flowers were observed on the inflorescence of Syngonium. The presence of a few calcium oxalate crystals was observed on the surface of all types of flowers. All the atypical flowers located at the base of the sterile zone corresponded to sterile male flowers and resulted from a more or less random disorganisation of the typical structure of a synandrode. In the Aroideae, free stamens or staminodes represent a plesiomorphic condition. The association of synandria and synandrodes is present in all early diverging genera of the tribe Caladieae and could represent the ancestral state. It is not clear if free stamens have evolved once or twice in the tribe Caladieae, both scenarios are possible.
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Call Number EcoFoG @ webmaster @ Serial 460
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Author Molto, Q.; Rossi, V.; Blanc, L.
Title Error propagation in biomass estimation in tropical forests Type Journal Article
Year 2013 Publication Methods in Ecology and Evolution Abbreviated Journal
Volume 4 Issue (up) 2 Pages 175-183
Keywords Bayesian framework; Modelling; Redd; Uncertainty propagation
Abstract 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.
Address CIRAD, UMR 'Ecologie des Forêts de Guyane', Kourou Cedex, 97 379, France
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Notes Export Date: 21 February 2013; Source: Scopus Approved no
Call Number EcoFoG @ webmaster @ Serial 470
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Author Stahl, C.; Burban, B.; Wagner, F.; Goret, J.-Y.; Bompy, F.; Bonal, D.
Title Influence of Seasonal Variations in Soil Water Availability on Gas Exchange of Tropical Canopy Trees Type Journal Article
Year 2013 Publication Biotropica Abbreviated Journal
Volume 45 Issue (up) 2 Pages 155-164
Keywords French Guiana; Photosynthesis; Predawn leaf water potential; Rain forest; Relative extractable water; Respiration; Soil drought; Transpiration
Abstract Seasonal variations in environmental conditions influence the functioning of the whole ecosystem of tropical rain forests, but as yet little is known about how such variations directly influence the leaf gas exchange and transpiration of individual canopy tree species. We examined the influence of seasonal variations in relative extractable water in the upper soil layers on predawn leaf water potential, saturated net photosynthesis, leaf dark respiration, stomatal conductance, and tree transpiration of 13 tropical rain forest canopy trees (eight species) over 2 yr in French Guiana. The canopies were accessed by climbing ropes attached to the trees and to a tower. Our results indicate that a small proportion of the studied trees were unaffected by soil water depletion during seasonal dry periods, probably thanks to efficient deep root systems. The trees showing decreased tree water status (i.e., predawn leaf water potential) displayed a wide range of leaf gas exchange responses. Some trees strongly regulated photosynthesis and transpiration when relative extractable water decreased drastically. In contrast, other trees showed little variation, thus indicating good adaptation to soil drought conditions. These results have important applications to modeling approaches: indeed, precise evaluation and grouping of these response patterns are required before any tree-based functional models can efficiently describe the response of tropical rain forest ecosystems to future changes in environmental conditions. © 2012 by The Association for Tropical Biology and Conservation.
Address INRA, UMR 1137 Université de Lorraine, INRA Nancy 'Ecologie et Ecophysiologie Forestière', Champenoux 54280, France
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Notes Export Date: 13 March 2013; Source: Scopus Approved no
Call Number EcoFoG @ webmaster @ Serial 474
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Author Houel, E.; Rodrigues, A.M.S.; Jahn-Oyac, A.; Bessière, J.-M.; Eparvier, V.; Deharo, E.; Stien, D.
Title In vitro antidermatophytic activity of Otacanthus azureus (Linden) Ronse essential oil alone and in combination with azoles Type Journal Article
Year 2014 Publication Journal of Applied Microbiology Abbreviated Journal J. Appl. Microbiol.
Volume 116 Issue (up) 2 Pages 288-294
Keywords Antifungal activity; Azoles; Dermatophytes; Essential oil; Otacanthus azureus; Synergy
Abstract Aims: We determined the chemical composition and investigated the antifungal activity of Otacanthus azureus (Linden) Ronse essential oil (EO) against a range of dermatophytes alone or in combination with azole antifungals. Methods and Results: Aerial parts of the plant were steam-distilled and the obtained oil was analysed by gas chromatography/mass spectrometry and 1H-NMR. It was shown to be largely composed of sesquiterpenes, with the main component being β-copaen-4-α-ol. Using broth microdilution techniques, this oil was found to have remarkable in vitro antifungal activities. Minimum inhibitory concentrations as low as 4 μg ml-1 were recorded. The analysis of the combined effect of the O. azureus EO with azoles using chequerboard assays revealed a synergism between the EO and ketoconazole, fluconazole or itraconazole against Trichophyton mentagrophytes. Notably, the O. azureus essential oil showed low cytotoxicity to VERO cells. Conclusions: The O. azureus essential oil alone or in combination with azoles is a promising antifungal agent in the treatment for human dermatomycoses caused by filamentous fungi. Significance and Impact of the Study: There is much interest in the study of essential oils for the discovery of new antimicrobial drugs. This study has highlighted the antidermatophytic activity of the O. azureus EO. © 2013 The Society for Applied Microbiology.
Address Institut de Recherche pour le Développement (IRD), UMR 152 Pharma-DEV, Toulouse, France
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Notes Export Date: 9 February 2014; Source: Scopus; Coden: Jamif; Language of Original Document: English; Correspondence Address: Houël, E.; CNRS – UMR Ecologie des Forêts de Guyane (EcoFoG), Institut Pasteur de la Guyane, 23 Avenue Pasteur, BP6010, 97306 Cayenne Cedex, French Guiana; email: emeline.houel@ecofog.gf Approved no
Call Number EcoFoG @ webmaster @ Serial 526
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