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Author Leroy, C.; Jauneau, A.; Martinez, Y.; Cabin-Flaman, A.; Gibouin, D.; Orivel, J.; Séjalon-Delmas, N.
Title Exploring fungus-plant N transfer in a tripartite ant-plant-fungus mutualism Type Journal Article
Year 2017 Publication Annals of Botany Abbreviated Journal (down) Annals of Botany
Volume 120 Issue 3 Pages 417-426
Keywords Ascomycetes; endophytic fungi; Hirtella physophora; microscopy; mutualism; myrmecophyte; NanoSIMS; stable isotope
Abstract Background and Aims The plant Hirtella physophora, the ant Allomerus decemarticulatus and a fungus, Trimmatostroma sp., form a tripartite association. The ants manipulate both the plant trichomes and the fungus to build galleries under the stems of their host plant used to capture prey. In addition to its structural role, the fungus also improves nutrient uptake by the host plant. But it still remains unclear whether the fungus plays an indirect or a direct role in transferring nutrients to the plant. This study aimed to trace the transfer of N from the fungus to the plant's stem tissue. • Methods Optical microscopy and transmission electron microscopy (TEM) were used to investigate the presence of fungal hyphae in the stem tissues. Then, a 15N-labelling experiment was combined with a nanoscale secondary-ion mass spectrometry (NanoSIMS 50) isotopic imaging approach to trace the movement of added 15N from the fungus to plant tissues. • Key Results The TEM images clearly showed hyphae inside the stem tissue in the cellular compartment. Also, fungal hyphae were seen perforating the wall of the parenchyma cell. The 15N provisioning of the fungus in the galleries resulted in significant enrichment of the 15N signature of the plant's leaves 1 d after the 15N-labelling solution was deposited on the fungus-bearing trap. Finally, NanoSIMS imaging proved that nitrogen was transferred biotrophically from the fungus to the stem tissue. • Conclusions This study provides evidence that the fungi are connected endophytically to an ant-plant system and actively transfer nitrogen from 15N-labelling solution to the plant's stem tissues. Overall, this study underlines how complex the trophic structure of ant-plant interactions is due to the presence of the fungus and provides insight into the possibly important nutritional aspects and tradeoffs involved in myrmecophyte-ant mutualisms. © The Author 2017.
Address Laboratoire de Recherches en Sciences Végétales, Université de Toulouse, CNRS, UPS, France
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Notes Export Date: 2 October 2017 Approved no
Call Number EcoFoG @ webmaster @ Serial 767
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Author Lehnebach, R.; Beyer, R.; Letort, V.; Heuret, P.
Title Corrigendum: The pipe model theory half a century on: A review (Annals of Botany DOI: 10.1093/aob/mcx194) Type Journal Article
Year 2018 Publication Annals of Botany Abbreviated Journal (down) Annals of Botany
Volume 121 Issue 7 Pages 1427
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Abstract There was an error in the affiliations of Véronique Letort. The correct affiliation is Laboratory of Mathematics in Interaction with Computer Science (MICS), CentraleSupélec, France The online paper has been corrected.
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Notes Export Date: 16 July 2018 Approved no
Call Number EcoFoG @ webmaster @ Serial 810
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Author Faucheux, M.J.; Gibernau, M.
Title Antennal sensilla in five Psychodini moth flies (Diptera: Psychodidae: Psychodinae) pollinators of Arum spp. (Araceae) Type Journal Article
Year 2011 Publication Annales de la Societe Entomologique de France Abbreviated Journal (down) Ann. Soc. Entomol. Fr.
Volume 47 Issue 1-2 Pages 89-100
Keywords Chodopsycha; Deceptive pollination; Logima; Psycha; Psychoda
Abstract The pollination of the genus Arum (Araceae) is mainly achieved by deception, the floral odour mimicking the pollinator ovipositing site. In order to discover the sensory organs involved in this attraction, we have studied the antennae of five species of psychodine moth-flies (former Psychoda sensu lato = Psychodini), pollinators of Arum spp. The antennae of the five Psychodini reveal seven types of sensilla: multiporous tribranched sensilla basiconica (sensilla ascoidea), multiporous sensilla basiconica, multiporous sensilla coeloconica, multiporous sensilla auricillica, uniporous sensilla basiconica, aporous sensilla chaetica, aporous Böhm's sensilla. Each species possesses three, five or six of these sensillum types. All the multiporous sensilla are probably olfactory receptors while the uniporous sensilla basiconica must possess a contact chemoreceptive function. The multiporous tribranched sensilla basiconica (s. ascoidea), present in all the species, are the best candidates for the reception of the odours given off by the ovipositing sites and the inflorescences of Arum. The multiporous sensilla basiconica and the multiporous sensilla coeloconica may be involved respectively as CO2 receptors or thermoreceptors. Psychoda phalaenoides, which is the main pollinator of A. maculatum, is the species which possesses the largest number of antennal sensilla. The sexual dimorphism, studied only in Psycha grisescens, as concerns the number of sensilla and the absence of a sensillum type which differ according to sex, is difficult to interpret.
Address CNRS – Ecofog UMR 8172, BP 709, F-97387 Kourou, France
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Notes Export Date: 26 October 2011; Source: Scopus; Language of Original Document: English; Correspondence Address: Faucheux, M.J.; Université de Nantes, Laboratoire d'Endocrinologie des Insectes Sociaux, 2 rue de la Houssinière, F-44322 Nantes Cedex 03, France; email: faucheux.michel@free.fr Approved no
Call Number EcoFoG @ webmaster @ Serial 365
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Author Chartier, M.; Pélozuelo, L.; Gibernau, M.
Title Do floral odor profiles geographically vary with the degree of specificity for pollinators? Investigation in two sapromyophilous Arum species (Araceae) Type Journal Article
Year 2011 Publication Annales de la Societe Entomologique de France Abbreviated Journal (down) Ann. Soc. Entomol. Fr.
Volume 47 Issue 1-2 Pages 71-77
Keywords Arum italicum; Arum maculatum; Floral scent; Psychodidae; Specificity
Abstract We compared floral odour profiles among populations of two Arum species which show different degrees of specificity for their fly pollinators. Insects were collected from inflorescences in four populations of Arum italicum and two populations of Arum maculatum. In six Arum populations, we compared inflorescences odour profiles collected by Solid Phase Micro Extraction (SPME) and analysed by gas chromatography. We confirmed that from a pollination point of view, A. italicum is an opportunist species, as it is mainly pollinated by insects of the families Psychodidae, Chironomidae and Sciaridae, whereas A. maculatum is a specialist species, as it is 90% pollinated by Psychodidae. In all populations, Arum italicum was less attractive to pollinators than Arum maculatum. Floral odour profiles of A. italicum were not geographically structured among populations, suggesting a high gene flow or adaptation to a fluctuant guild of pollinators. On the contrary, odour profiles of A. maculatum varied between the two populations studied suggesting a lower gene flow or adaptation to different local pollinator preferences.
Address CNRS – Ecofog (UMR 8172), BP709, F-97387 Kourou, France
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Notes Export Date: 26 October 2011; Source: Scopus; Language of Original Document: English; Correspondence Address: Chartier, M.; Université Paul Sabatier, Laboratoire Evolution and Diversité Biologique (UMR 5174), Bât. 4R3-B2, F-31062 Toulouse cedex 9, France; email: chartier.marion@gmail.com Approved no
Call Number EcoFoG @ webmaster @ Serial 366
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Author Mariano, C.S.F.; Silva Santos, I.D.A.; Groc, S.; Leroy, C.; Malé, P.-J.; Ruiz-González, M.X.; Cerdan, P.; Dejean, A.; Delabie, J.H.C.
Title The karyotypes of Gigantiops destructor (Fabricius) and other ants from French Guiana (Formicidae) Type Journal Article
Year 2011 Publication Annales de la Societe Entomologique de France Abbreviated Journal (down) Ann. Soc. Entomol. Fr.
Volume 47 Issue 1-2 Pages 140-146
Keywords Chromosome number; Diversity; Minimum interaction theory
Abstract The aim of this study, which was conducted in French Guiana, was to characterize the karyotypes of nine ant species belonging to the genera Anochetus, Apterostigma, Cyphomyrmex, Camponotus, Gigantiops, Myrmicocrypta, Odontomachus and Pseudomyrmex, and to compare them with published data. We present the first descriptions of the karyotypes of Gigantiops destructor (Fabricius), an endemic Formicinae of the Amazonian region, which is the only living species in the tribe Gigantiopini, and of a species from the poorly-known cryptic genus Myrmicocrypta, which belongs to the Myrmicinae tribe Attini.
Address HYDRECO, Laboratoire Environnement Aménagement de Petit Saut, BP 823, F- 97388 Kourou Cedex, France
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Notes Export Date: 26 October 2011; Source: Scopus; Language of Original Document: English; Correspondence Address: Delabie, J.H.C.; Universidade Estadual de Santa Cruz, Rodovia Ilhéus-Itabuna, Km 16, 45650-000 Ilhéus, Bahia, Brazil Approved no
Call Number EcoFoG @ webmaster @ Serial 367
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Author Lang, G.; Marcon, E.; Puech, F.
Title Distance-based measures of spatial concentration: introducing a relative density function Type Journal Article
Year 2020 Publication Annals of Regional Science Abbreviated Journal (down) Ann. Reg. Sci.
Volume 64 Issue 2 Pages 243-265
Keywords Agglomeration; Aggregation; Economic geography; Point patterns; Spatial concentration; accuracy assessment; econometrics; economic activity; economic geography; industrial agglomeration; industrial location; location decision; spatial analysis; spatial distribution
Abstract For more than a decade, distance-based methods have been widely employed and constantly improved in spatial economics. These methods are a very useful tool for accurately evaluating the spatial distribution of economic activity. We introduce a new distance-based statistical measure for evaluating the spatial concentration of industries. The m function is the first relative density function to be proposed in economics. This tool supplements the typology of distance-based methods recently drawn up by Marcon and Puech (J Econ Geogr 3(4):409–428, 2003). By considering several simulated and real examples, we show the advantages and the limits of the m function for detecting spatial structures in economics. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
Address RITM, Univ. Paris-Sud, Université Paris-Saclay and CREST, Sceaux, France
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Call Number EcoFoG @ webmaster @ Serial 976
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Author Brémaud, I.; El Kaïm, Y.; Guibal, D.; Minato, K.; Thibaut, B.; Gril, J.
Title Characterisation and categorisation of the diversity in viscoelastic vibrational properties between 98 wood types Type Journal Article
Year 2012 Publication Annals of Forest Science Abbreviated Journal (down) Ann. Forest Sci.
Volume 69 Issue 3 Pages 373-386
Keywords Damping coefficient; Dynamic mechanical properties; Specific dynamic modulus of elasticity; Specific gravity; Viscoelastic vibrational properties; Wood diversity
Abstract · Context Increased knowledge on diversity in wood properties would have implications both for fundamental research and for promoting a diversification of uses as material. · Aims The objective is to contribute to overcoming the critical lack of data on the diversity of wood dynamic mechanical/viscoelastic vibrational properties by testing lesser known species and categorising sources of variability. · Methods Air-dry axial specific dynamic modulus of elasticity (E′/γ) and damping coefficient (tand) were measured on a wide sampling (1,792 specimens) of 98 wood types from 79 species. An experimental device and protocol was designed for conducting systematic (i.e. rapid and reproducible) characterisations. · Results Diversity at the specimens' level corroborates the “standard” relationship between tanδ and E'/γ, which is discussed in terms of orientation of wood elements and of chemical composition. Diversity at the species level is expressed on the basis of results for normal heartwood, with specific gravity (γ) ranging from 0.2 to 1.3. Axial E'/γ ranges from 9 to 32 GPa and tand from 4×10 -3 to 19×10 -3. Properties distribution follows a continuum, but with group characteristics. The lowest values of tanδ are only found in certain tropical hardwoods. Results can also suggest alternative species for musical instruments making. · Conclusion The variations in specific gravity, in stiffness or in “viscosity” appear to be predominantly linked to different levels of diversity: between species or between wood types (reaction wood or taxonomy-related differences in heartwood extractives). © INRA/Springer-Verlag France 2011.
Address Wood Laboratory, EMPA, Überlandstrasse 129, 8600 Dübendorf, Switzerland
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Notes Export Date: 20 June 2012; Source: Scopus; Coden: Afosf; doi: 10.1007/s13595-011-0166-z; Language of Original Document: English; Correspondence Address: Brémaud, I.; Wood Laboratory, EMPA, Überlandstrasse 129, 8600 Dübendorf, Switzerland; email: iris_bremaud@hotmail.com Approved no
Call Number EcoFoG @ webmaster @ Serial 403
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Author McLean, J.P.; Arnould, O.; Beauchene, J.; Clair, B.
Title 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 (down) 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
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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
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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 (down) Ann. Forest Sci.
Volume 69 Issue 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 Nicolini, E.; Beauchene, J.; De La Vallee, B.L.; Ruelle, J.; Mangenet, T.; Heuret, P.
Title Dating branch growth units in a tropical tree using morphological and anatomical markers: The case of Parkia velutina Benoist (Mimosoïdeae) Type Journal Article
Year 2012 Publication Annals of Forest Science Abbreviated Journal (down) Ann. Forest Sci.
Volume 69 Issue 5 Pages 543-555
Keywords Crown development; Deciduousness; Dendrochronology; French Guiana; Growth ring; Phenology; Tree architecture; Wood anatomy
Abstract • Context In tropical areas, studies based on the retrospective analysis of tree development have focused principally on growth ring research. The interpretation of primary growth markers is overlooked although it opens perspectives to provide long time-series on tree-crown development. • Aims This study focused on Parkia velutina, an emergent tree of neotropical rain forests. Our objectives were (1) to characterize the phenological cycle of this species, and (2) to identify temporally interpretable morphological and anatomical markers. • Methods We collected dominant branches in 14 adult trees and identified growth markers that limit longitudinal and radial increments. We coupled this approach with a 2-year phenological survey of 20 trees. • Results Leaf shedding, growth unit elongation and growth ring formation define the phenological cycle. At tree scale, this cycle is synchronous and affects all axes. At population scale, trees can be desynchronized. This cycle is annual despite some slight variability. Successive growth units and growth rings are easily identifiable. • Conclusion Dating a branch by counting the number of growth units or growth rings is possible in many years with a reasonable error. Nevertheless, estimating their precise month of formation in order to study climatic influences remains difficult. © INRA/Springer-Verlag France 2012.
Address INRA, UMR AMAP, TA A-51/PS2, Montpellier 34398, France
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Notes Export Date: 27 September 2012; Source: Scopus; Coden: Afosf; doi: 10.1007/s13595-011-0172-1; Language of Original Document: English; Correspondence Address: Nicolini, E.; Unité Mixte de Recherche CIRAD-CNRS-INRA-IRD-Université Montpellier 2, BotAnique et BioinforMatique de l'Architecture des Plantes (AMAP), BP 701, Kourou 97387, French Guiana; email: eric-andre.nicolini@cirad.fr Approved no
Call Number EcoFoG @ webmaster @ Serial 436
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