toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
Details
   print
  Records Links
Author McLean, J.P.; Arnould, O.; Beauchene, J.; Clair, B. url  openurl
  Title (down) The effect of the G-layer on the viscoelastic properties of tropical hardwoods Type Journal Article
  Year 2012 Publication Annals of Forest Science Abbreviated Journal Ann. Forest Sci.  
  Volume 69 Issue 3 Pages 399-408  
  Keywords Dma; G-layer; Reaction wood; Tropical wood; Viscoelasticity  
  Abstract · Context and aim This study aimed to examine the effect of the tension wood G-layer on the viscoelastic properties of wood. · Methods Tension wood and opposite wood samples were obtained from six French Guianese tropical rainforest species (Sextonia rubra, Ocotea guyanensis, Inga alba, Tachigali melinoni, Iyranthera sagotiana and Virola michelii); the tension wood of the former three of these species had a Glayer, whilst the tension wood from the latter three had no Glayer. Tensile dynamic mechanical analysis (DMA) was performed on green never dried wood samples in the longitudinal direction with samples submerged in a water bath at a temperature (30°C) and frequency (1 Hz) representative of the conditions experienced by wood within a living tree. Then, DMA was repeated with samples conditioned to an air-dried state. Finally, samples were oven-dried to measure longitudinal shrinkage. · Results Tension wood did not always have a higher longitudinal storage (elastic) modulus than opposite wood from the same tree regardless of the presence or absence of a G-layer. For the species containing a G-layer, tension wood had a higher damping coefficient and experienced a greater longitudinal shrinkage upon drying than opposite wood from the same species. No difference was found in damping coefficients between tension wood and opposite wood for the species that had no G-layer. · Conclusion It is proposed that the different molecular composition of the G-layer matrix has an influence on the viscoelasticity of wood, even if a biomechanical gain is not yet clear. This study shows that rheological properties and longitudinal shrinkage can be used to detect the presence of a G-layer in tension wood. © INRA/Springer-Verlag France 2011.  
  Address UMR Ecologie des Forêts de Guyane (ECOFOG), CIRAD, Kourou, French Guiana  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 12864560 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 20 June 2012; Source: Scopus; Coden: Afosf; doi: 10.1007/s13595-011-0164-1; Language of Original Document: English; Correspondence Address: McLean, J.P.; Forest Products Research Institute, Edinburgh Napier University, Merchiston Campus, Edinburgh EH10 5DT, United Kingdom; email: p.mclean@napier.ac.uk Approved no  
  Call Number EcoFoG @ webmaster @ Serial 404  
Permanent link to this record
 

 
Author Chang, S.-S.; Quignard, F.; Clair, B. url  doi
openurl 
  Title (down) The effect of sectioning and ultrasonication on the mesoporosity of poplar tension wood Type Journal Article
  Year 2017 Publication Wood Science and Technology Abbreviated Journal  
  Volume 51 Issue 3 Pages 507-516  
  Keywords  
  Abstract Increasing interest in understanding tension stress generation in tension wood with fibres having a gelatinous layer (G-layer) has focused attention on the specific role of this layer. To distinguish its contribution from those of other wall layers, the G-layer of wood sections was isolated by ultrasonication. The aim of this study was to assess the effect of sectioning and of the ultrasonic treatment on the mesoporosity of tension wood using nitrogen adsorption–desorption analysis. The results showed that the process of isolating the G-layer using ultrasonication strongly affects its mesoporosity. Most damage was found to occur during sectioning rather than as a result of the 15-min ultrasonic treatment.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1432-5225 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Chang2017 Serial 782  
Permanent link to this record
 

 
Author Heu, Katy ; Romoli, Ottavia ; Schonbeck, Johan Claes ; Ajenoe, Rachel ; Epelboin, Yanouk ; Kircher, Verena ; Houel, Emeline ; Estevez, Yannick ; Gendrin, Mathilde doi  openurl
  Title (down) The Effect of Secondary Metabolites Produced by Serratia marcescens on Aedes aegypti and Its Microbiota Type Journal Article
  Year 2021 Publication Frontiers in Microbiology Abbreviated Journal  
  Volume 12 Issue Pages 645701  
  Keywords  
  Abstract Serratia marcescens is a bacterial species widely found in the environment, which very efficiently colonizes mosquitoes. In this study, we isolated a red-pigmented S. marcescens strain from our mosquito colony (called S. marcescens VA). This red pigmentation is caused by the production of prodigiosin, a molecule with antibacterial properties. To investigate the role of prodigiosin on mosquito- S. marcescens interactions, we produced two white mutants of S. marcescens VA by random mutagenesis. Whole genome sequencing and chemical analyses suggest that one mutant has a nonsense mutation in the gene encoding prodigiosin synthase, while the other one is deficient in the production of several types of secondary metabolites including prodigiosin and serratamolide. We used our mutants to investigate how S. marcescens secondary metabolites affect the mosquito and its microbiota. Our in vitro tests indicated that S. marcescens VA inhibits the growth of several mosquito microbiota isolates using a combination of prodigiosin and other secondary metabolites, corroborating published data. This strain requires secondary metabolites other than prodigiosin for its proteolytic and hemolytic activities. In the mosquito, we observed that S. marcescens VA is highly virulent to larvae in a prodigiosin-dependent manner, while its virulence on adults is lower and largely depends on other metabolites  
  Address  
  Corporate Author Thesis  
  Publisher Frontiers Media Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 1024  
Permanent link to this record
 

 
Author Bandou, E.; Lebailly, F.; Muller, F.; Dulormne, M.; Toribio, A.; Chabrol, J.; Courtecuisse, R.; Plenchette, C.; Prin, Y.; Duponnois, R.; Thiao, M.; Sylla, S.; Dreyfus, B.; Ba, A.M. openurl 
  Title (down) The ectomycorrhizal fungus Scleroderma bermudense alleviates salt stress in seagrape (Coccoloba uvifera L.) seedlings Type Journal Article
  Year 2006 Publication Mycorrhiza Abbreviated Journal Mycorrhiza  
  Volume 16 Issue 8 Pages 559-565  
  Keywords Coccoloba uvifera; ectomycorrhizal dependency; mineral uptake; salt stress; water status  
  Abstract The purpose of this study was to test the capacity of the ectomycorrhizal (ECM) fungus, Scleroderma bermudense, to alleviate saline stress in seagrape (Coccoloba uvifera L.) seedlings. Plants were grown over a range (0, 200, 350 and 500 mM) of NaCl levels for 12 weeks, after 4 weeks of non-saline pre-treatment under greenhouse conditions. Growth and mineral nutrition of the seagrape seedlings were stimulated by S. bermudense regardless of salt stress. Although ECM colonization was reduced with increasing NaCl levels, ECM dependency of seagrape seedlings increased. Tissues of ECM plants had significantly increased concentrations of P and K but lower Na and Cl concentrations than those of non-ECM plants. Higher K concentrations in the leaves of ECM plants suggested a higher osmoregulating capacity of these plants. Moreover, the water status of ECM plants was improved despite their higher evaporative leaf surface. The results suggest that the reduction in Na and Cl uptake together with a concomitant increase in P and K absorption and a higher water status in ECM plants may be important salt-alleviating mechanisms for seagrape seedlings growing in saline soils.  
  Address Univ Antilles Guyane, Fac Sci Exactes & Nat, Lab Biol & Physiol Vegetales, F-97159 Guadeloupe, France, Email: amadou.ba@univ-ag.fr  
  Corporate Author Thesis  
  Publisher SPRINGER Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0940-6360 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000241687200006 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 221  
Permanent link to this record
 

 
Author Dejean, A.; Delabie, J.H.; Corbara, B.; Azémar, F.; Groc, S.; Orivel, J.; Leponce, M. pdf  url
openurl 
  Title (down) The ecology and feeding habits of the arboreal trap-jawed ant Daceton armigerum Type Journal Article
  Year 2012 Publication PloS one Abbreviated Journal PLoS ONE  
  Volume 7 Issue 5 Pages e37683  
  Keywords animal; ant; article; ecology; feeding behavior; Hemiptera; physiology; predation; Animals; Ants; Ecology; Feeding Behavior; Hemiptera; Predatory Behavior  
  Abstract Here we show that Daceton armigerum, an arboreal myrmicine ant whose workers are equipped with hypertrophied trap-jaw mandibles, is characterized by a set of unexpected biological traits including colony size, aggressiveness, trophobiosis and hunting behavior. The size of one colony has been evaluated at ca. 952,000 individuals. Intra- and interspecific aggressiveness were tested and an equiprobable null model used to show how D. armigerum colonies react vis-à-vis other arboreal ant species with large colonies; it happens that D. armigerum can share trees with certain of these species. As they hunt by sight, workers occupy their hunting areas only during the daytime, but stay on chemical trails between nests at night so that the center of their home range is occupied 24 hours a day. Workers tend different Hemiptera taxa (i.e., Coccidae, Pseudococcidae, Membracidae and Aethalionidae). Through group-hunting, short-range recruitment and spread-eagling prey, workers can capture a wide range of prey (up to 94.12 times the mean weight of foraging workers).  
  Address Écologie des Forêts de Guyane, Campus Agronomique, Kourou, France.  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 19326203 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 2 November 2012; Source: Scopus; doi: 10.1371/journal.pone.0037683; PubMed ID: 22737205; Language of Original Document: English; Correspondence Address: Dejean, A.email: alain.dejean@wanadoo.fr Approved no  
  Call Number EcoFoG @ webmaster @ Serial 443  
Permanent link to this record
 

 
Author Dejean, A.; Azémar, F.; Céréghino, R.; Leponce, M.; Corbara, B.; Orivel, J.; Compin, A. url  doi
openurl 
  Title (down) The dynamics of ant mosaics in tropical rainforests characterized using the Self-Organizing Map algorithm Type Journal Article
  Year 2016 Publication Insect Science Abbreviated Journal Insect Science  
  Volume 23 Issue 4 Pages 630-637  
  Keywords ant plant relationships; dynamics of associations; myrmecophytes; tropical rainforests  
  Abstract Ants, the most abundant taxa among canopy-dwelling animals in tropical rainforests, are mostly represented by territorially dominant arboreal ants (TDAs) whose territories are distributed in a mosaic pattern (arboreal ant mosaics). Large TDA colonies regulate insect herbivores, with implications for forestry and agronomy. What generates these mosaics in vegetal formations, which are dynamic, still needs to be better understood. So, from empirical research based on 3 Cameroonian tree species (Lophira alata, Ochnaceae; Anthocleista vogelii, Gentianaceae; and Barteria fistulosa, Passifloraceae), we used the Self-Organizing Map (SOM, neural network) to illustrate the succession of TDAs as their host trees grow and age. The SOM separated the trees by species and by size for L. alata, which can reach 60 m in height and live several centuries. An ontogenic succession of TDAs from sapling to mature trees is shown, and some ecological traits are highlighted for certain TDAs. Also, because the SOM permits the analysis of data with many zeroes with no effect of outliers on the overall scatterplot distributions, we obtained ecological information on rare species. Finally, the SOM permitted us to show that functional groups cannot be selected at the genus level as congeneric species can have very different ecological niches, something particularly true for Crematogaster spp., which include a species specifically associated with B. fistulosa, nondominant species and TDAs. Therefore, the SOM permitted the complex relationships between TDAs and their growing host trees to be analyzed, while also providing new information on the ecological traits of the ant species involved. © 2015 Institute of Zoology, Chinese Academy of Sciences  
  Address Clermont Université, Université Blaise Pascal, LMGE, BP 10448, Clermont-Ferrand, France  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 1 September 2016 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 689  
Permanent link to this record
 

 
Author Orivel, J.; Leroy, C. openurl 
  Title (down) The diversity and ecology of ant gardens (Hymenoptera: Formicidae; Spermatophyta: Angiospermae) Type Journal Article
  Year 2011 Publication Myrmecological News Abbreviated Journal Myrmecol. News  
  Volume 14 Issue Pages 73-85  
  Keywords Ant-plant interactions; epiphytes; mutualisms; Neotropics; Paleotropics; phytotelm; parabiosis; seed dispersal; review  
  Abstract Mutualistic interactions between ants and plants are important features of many ecosystems, and they can be divided into three main categories: dispersal and protective mutualisms and myrmecotrophy. In both the Neotropics and the Southeastern Asian Paleotropics, ant gardens (AGs), a particular type of ant-plant interaction, are frequent. To initiate AGs, ants integrate the seeds of certain epiphyte species into the carton of their nest. The development of the plants leads to the formation of a cluster of epiphytes rooted in the carton. They have been defined as one of the most complex associations between ants and plants known because of the plurispecific, but also specialized nature of the association involving several phylogenetically-distant ant and plant species. The aim of this review is to provide a synthesis of the diversity and ecology of AGs, including the outcomes experienced by the partners in the interaction and the direct and indirect impacts ant-garden ants have on the plant and arthropod communities.  
  Address [Orivel, Jerome; Leroy, Celine] CNRS, UMR Ecol Forets Guyane, Kourou 97379, French Guiana, Email: jerome.orivel@ecofog.gf  
  Corporate Author Thesis  
  Publisher OESTERREICHISCHE GESELL ENTOMOFAUNISTIK, C/O NATURHISTOR MUSEUM WIEN Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1994-4136 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000286844100009 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 292  
Permanent link to this record
 

 
Author Salas-Lopez, A.; Talaga, S.; Lalague, H. doi  openurl
  Title (down) The discovery of devil's gardens: An ant-plant mutualism in the cloud forests of the Eastern Amazon Type Journal Article
  Year 2016 Publication Journal of Tropical Ecology Abbreviated Journal Journal of Tropical Ecology  
  Volume 32 Issue 3 Pages 264-268  
  Keywords ant-plant interactions; biogeography; cloud forest; Cordia nodosa; mutualism, Myrmelachista; refuge hypothesis  
  Abstract Devil's gardens are one of the most remarkable mutualistic associations between ants and plants. Myrmelachista ants eliminate all vegetation from around their host plants, resulting in wide forest clearings which have intrigued scientists from the start. Despite their noticeability, here we report the discovery of devil's gardens in remote highland cloud forests of the Eastern Amazon, more than 2000 km away from their nearest known analogues in Western Amazonia. We describe the ecological characteristics of these gardens and consider what factors could have produced the geographic isolation of Eastern Amazonian devil's gardens. Three hypotheses are investigated: (1) the host plant distribution restricts the distribution of the mutualism, (2) the ecological tolerances of Myrmelachista explain the isolation, and (3) the devil's gardens of the Eastern Amazon constitute relicts from ancient forest refugia. The distribution of the possible associated myrmecophytes and previously described ecological ranges of devil's gardens cannot explain their ecological restriction to cloud forests in Eastern Amazonia, but our discovery is consistent with the biogeographic refuge hypothesis (i.e. highlands along the Amazon Basin constitute refugia for humid forests that spread during the Cenozoic). Our finding opens exciting perspectives for comparative studies of the origin, ecology and evolutionary history of this ant-plant mutualism. Copyright © Cambridge University Press 2016.  
  Address INRA, UMR, EcoFoG, Campus Agronomique, BP 316, Kourou Cedex, France  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 1 September 2016 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 691  
Permanent link to this record
 

 
Author McLean, J.P.; Zhang, T.; Bardet, S.; Beauchene, J.; Thibaut, A.; Clair, B.; Thibaut, B. openurl 
  Title (down) The decreasing radial wood stiffness pattern of some tropical trees growing in the primary forest is reversed and increases when they are grown in a plantation Type Journal Article
  Year 2011 Publication Annals of Forest Science Abbreviated Journal Ann. For. Sci.  
  Volume 68 Issue 4 Pages 681-688  
  Keywords Tropical trees; Growth strategy; Wood stiffness; Juvenile wood  
  Abstract Background This study examines the radial trend in wood stiffness of tropical rainforest trees. The objective was to determine if the type of growing environment (exposed plantation or dense primary forest) would have an effect on this radial trend. Methods The axial elastic modulus of wood samples, representing a pith to bark cross-section, of six trees from several French Guianese species (two of Eperua falcata, one of Eperua grandiflora, two of Carapa procera and one of Symphonia gloubulifera) was measured using a dynamic “forced vibration” method. Results Primary forest trees were observed to have a decrease in wood stiffness from pith to bark, whereas plantation trees, from the same genus or species, displayed a corresponding increase in wood stiffness. Juvenile wood stiffness appears to vary depending on the environment in which the tree had grown. Conclusion We suggest that the growth strategy of primary forest trees is to produce wood resistant to self-buckling so that the height of the canopy may be obtained with the maximum of efficiency. In contrast, the growth strategy of the trees growing in an exposed plantation is to produce low-stiffness wood, important to provide flexibility in wind. Further experiments to study the behaviour of more species, with more individuals per species, growing across a range of physical environments, are required.  
  Address [McLean, JP; Bardet, S; Clair, B; Thibaut, B] Univ Montpellier 2, LMGC, CNRS, F-34095 Montpellier, France, Email: p.mclean@auckland.ac.nz  
  Corporate Author Thesis  
  Publisher Springer France Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1286-4560 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000292553400003 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 326  
Permanent link to this record
 

 
Author Marcon, E.; Herault, B.; Baraloto, C.; Lang, G. url  doi
openurl 
  Title (down) The decomposition of Shannon's entropy and a confidence interval for beta diversity Type Journal Article
  Year 2012 Publication Oikos Abbreviated Journal Oikos  
  Volume 121 Issue 4 Pages 516-522  
  Keywords  
  Abstract Beta diversity is among the most employed theoretical concepts in ecology and biodiversity conservation. Up to date, a self-contained definition of it, with no reference to alpha and gamma diversity, has never been proposed. Using Kullback-Leibler divergence, we present the explicit formula of Shannon's β entropy, a bias correction for its estimator and a confidence interval. We also provide the mathematical framework to decompose Shannon diversity into several hierarchical nested levels. From botanical inventories of tropical forest plots in French Guiana, we estimate Shannon diversity at the plot, forest and regional level. We believe this is a complete and usefulness toolbox for ecologists interested in partitioning biodiversity. © 2011 The Authors. Oikos © 2012 Nordic Society Oikos.  
  Address AgroParisTech, UMR 518 Math. Info. Appli., 16 rue Claude Bernard, FR-75005 Paris, France  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 00301299 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 28 March 2012; Source: Scopus; Coden: Oiksa; doi: 10.1111/j.1600-0706.2011.19267.x; Language of Original Document: English; Correspondence Address: Marcon, E.; AgroParisTech, UMR EcoFoG, BP 709, FR-97310 Kourou, France; email: eric.marcon@ecofog.gf Approved no  
  Call Number EcoFoG @ webmaster @ Serial 386  
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Save Citations:
Export Records: