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Author Epron, D.; Bosc, A.; Bonal, D.; Freycon, V. openurl 
  Title Spatial variation of soil respiration across a topographic gradient in a tropical rain forest in French Guiana Type Journal Article
  Year 2006 Publication Journal of Tropical Ecology Abbreviated Journal J. Trop. Ecol.  
  Volume (down) 22 Issue Pages 565-574  
  Keywords acrisol; carbon balance; carbon flux; gleysol; root biomass  
  Abstract The objective of this study was to analyse the factors explaining spatial variation in soil respiration over topographic transects in a tropical rain forest of French Guiana. The soil of 30 plots along six transects was characterized. The appearance of the 'dry to the touch' character at a depth of less than 1.2 m was used to discriminate soils exhibiting vertical drainage from soils exhibiting superficial lateral drainage and along with colour and texture, to define five classes from well-drained to strongly hydromorphic soils. Spatial variation in soil respiration was closely related to topographic position and soil type. Increasing soil water content and bulk density and decreasing root biomass and soil carbon content explained most of the decrease in soil respiration from the plateaux (vertically drained hypoferralic acrisol) to the bottomlands (haplic gleysol). These results will help to stratify further field experiments and to identify the underlying determinants of spatial variation in soil respiration to develop mechanistic models of soil respiration.  
  Address Univ Nancy 1, UMR 1137, INRA, UHP Ecol & Ecophysiol Forestieres,Fac Sci, F-54506 Vandoeuvre Les Nancy, France, Email: Daniel.Epron@scbiol.uhp-nancy.fr  
  Corporate Author Thesis  
  Publisher CAMBRIDGE UNIV PRESS Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0266-4674 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000239975200008 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 179  
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Author Millet, J.; Pascal, J.P.; Kiet, L.C. openurl 
  Title Effects of Disturbance Over 60 Years on a Lowland Forest in Southern Vietnam Type Journal Article
  Year 2010 Publication Journal of Tropical Forest Science Abbreviated Journal J. Trop. For. Sci.  
  Volume (down) 22 Issue 3 Pages 237-246  
  Keywords Lowland tropical forest; disturbance impact; floristic composition; forest structure; Tan Phu forest  
  Abstract MILLET J, PASCAL JP & MET LC. 2010. Effects of disturbance over 60 years on a lowland forest in southern Vietnam. Tropical lowland forests are some of the most threatened in the world and this is particularly the case in Vietnam. This study aimed to identify changes in species composition and forest structure in the Tan Phu lowland forest resulting from disturbance over a 60 year period. Analysis of forest composition and structure rely on data from 25 plots of 0.5-ha size established in a lowland secondary forest. The five forest stands described differed greatly from the three forest stand types described in 1943. Some long-lived shade-tolerant species had been replaced by pioneer species, such as Cratoxylon formosum and Shorea roxburghii. In addition to altering composition, forest disturbances had resulted in large changes in forest structure. While in the past, forest stands had a large number of exploitable trees, current forest stands have few trees in the diameter class > 50 cm and sometimes no trees in the diameter class > 80 cm. This paper provides notable results on forest tree ecology, forest dynamics and on the state of secondary forests in Vietnam. This is particularly important as future goods and services will increasingly have to come from such forests.  
  Address [Millet, J.] Univ Lyon 1, F-69622 Villeurbanne, France, Email: jerome.millet@ird.if  
  Corporate Author Thesis  
  Publisher FOREST RESEARCH INST MALAYSIA Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0128-1283 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000280653200003 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 283  
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Author Niamké, F.B.; Amusant, N.; Kadio, A.A.; Thevenon, M.-F.; Nourissier, S.; Adima, A.A.; Jay-Allemand, C.; Chaix, G. url  openurl
  Title Rapid prediction of phenolic compounds as chemical markers for the natural durability of teak (Tectona grandis Linn f.) heartwood by near infrared spectroscopy Type Journal Article
  Year 2014 Publication Journal of Near Infrared Spectroscopy Abbreviated Journal J. Near Infrared Spectrosc.  
  Volume (down) 22 Issue 1 Pages 35-43  
  Keywords Heartwood; Hplc; Natural durability; NIR spectroscopy; Phenolic; Prediction; Quinone; Tectona grandis  
  Abstract Near infrared (NIR) spectroscopy provides rapid and non-destructive analysis of wood properties and composition. In this study, we aimed to use NIR measurement for the prediction of teak phenolic compounds, which are chemical markers for natural durability of wood. Twenty-seven teak trees from two geographical zones (Malaysia and Ivory Coast) were used. On ground heartwood samples, the content of total phenolics and individual quinones (tectoquinone, 2-(hydroxymethyl)anthraquinone, 2-anthraquinone carboxylic acid, 1,4-naphthoquinoneand 4c,5c-dihydroxy-epiisocatalponol) were determined using high performance liquid chromatography (HPLC). Partial least squares (PLS) regression with NIR spectra on the same samples and phenolic data was used to build NIR models for phenolic contents. The PLS models for the total predicted phenolics and three quinone contents (tectoquinone, 2-(hydroxymethyl) anthraquinone, and 4¢,5¢-dihydroxy-epiisocatalponol) showed a good ratio of performance to deviation (RPD ≥ 2.5), strong coefficients of determination (r2 ≥ 0.8) and the prediction errors were consistent with the reference method. These results demonstrate that NIR spectroscopy can be reliable for the evaluation of total phenolics and individual quinones in teak heartwood wood meal. NIR spectroscopy is a promising technique for rapidly providing information on the quinone contents in teak wood and indirectly for knowing its natural durability. This finding leads to a precise, non-destructive tool for teak wood quality evaluation. © IM Publications LLP 2014.  
  Address CIRAD-UMR AGAP, Department of Forest Science, ESALQ / University of São Paulo, Avenue Pàdua Dias 11, CEP 13418-900, Piracicaba-SP, Brazil  
  Corporate Author Thesis  
  Publisher N I R Publications Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 17516552 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 20 May 2014; Source: Scopus; Language of Original Document: English; Correspondence Address: Niamké, F.B.; LAPISEN, Groupe de Recherche en Chimie des Eaux et des Substances Naturelles, Institut National Polytechnique Houphouët Boigny, BP 1313, Yamoussoukro, Cote d'Ivoire Approved no  
  Call Number EcoFoG @ webmaster @ Serial 542  
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Author Dejean, A.; Corbara, B.; Céréghino, R.; Leponce, M.; Roux, O.; Rossi, V.; Delabie, J.H.C.; Compin, A. doi  openurl
  Title Traits allowing some ant species to nest syntopically with the fire ant Solenopsis saevissima in its native range Type Journal Article
  Year 2015 Publication Insect Science Abbreviated Journal Insect Science  
  Volume (down) 22 Issue 2 Pages 289-294  
  Keywords Ant community; Fire ants; Invasive species; Solenopsis saevissima; Species coexistence; Supercoloniality  
  Abstract Supercolonies of the red fire ant Solenopsis saevissima (Smith) develop in disturbed environments and likely alter the ant community in the native range of the species. For example, in French Guiana only 8 ant species were repeatedly noted as nesting in close vicinity to its mounds. Here, we verified if a shared set of biological, ecological, and behavioral traits might explain how these 8 species are able to nest in the presence of S. saevissima. We did not find this to be the case. We did find, however, that all of them are able to live in disturbed habitats. It is likely that over the course of evolution each of these species acquired the capacity to live syntopically with S. saevissima through its own set of traits, where colony size (4 species develop large colonies), cuticular compounds which do not trigger aggressiveness (6 species) and submissive behaviors (4 species) complement each other. © 2013 Institute of Zoology, Chinese Academy of Sciences.  
  Address U.P.A. Laboratório de Mirmecologia, Convênio UESC/CEPLAC, C.P. 7Itabuna, Bahia, Brazil  
  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: 9 April 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 594  
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Author Do, N.A.; Dias, D.; Zhang, Z.; Huang, X.; Nguyen, T.T.; Pham, V.V.; Nait-Rabah, O. url  doi
openurl 
  Title Study on the behavior of squared and sub-rectangular tunnels using the Hyperstatic Reaction Method Type Journal Article
  Year 2020 Publication Transportation Geotechnics Abbreviated Journal Transp. Geotech.  
  Volume (down) 22 Issue 100321 Pages  
  Keywords Finite element method; Lining; Squared shape; Sub-rectangular shape; Tunnel; efficiency measurement; finite element method; numerical model; transportation development; transportation planning; tunnel design; tunnel lining  
  Abstract  
  Address Saint-Petersburg Mining University, Russian Federation  
  Corporate Author Thesis  
  Publisher Elsevier Ltd Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 22143912 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 915  
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Author Legeay, J.; Husson, C.; Boudier, B.; Louisanna, E.; Baraloto, C.; Schimann, H.; Marcais, B.; Buée, M. doi  openurl
  Title Surprising low diversity of the plant pathogen Phytophthora in Amazonian forests Type Journal Article
  Year 2020 Publication Environmental Microbiology Abbreviated Journal Environ. Microbiol.  
  Volume (down) 22 Issue 12 Pages 5019-5032  
  Keywords  
  Abstract The genus Phytophthora represents a group of plant pathogens with broad global distribution. The majority of them cause the collar and root-rot of diverse plant species. Little is known about Phytophthora communities in forest ecosystems, especially in the Neotropical forests where natural enemies could maintain the huge plant diversity via negative density dependence. We characterized the diversity of soil-borne Phytophthora communities in the North French Guiana rainforest and investigated how they are structured by host identity and environmental factors. In this little-explored habitat, 250 soil cores were sampled from 10 plots hosting 10 different plant families across three forest environments (Terra Firme, Seasonally Flooded and White Sand). Phytophthora diversity was studied using a baiting approach and metabarcoding (High-Throughput Sequencing) on environmental DNA extracted from both soil samples and baiting-leaves. These three approaches revealed very similar communities, characterized by an unexpected low diversity of Phytophthora species, with the dominance of two cryptic species close to Phytophthora heveae. As expected, the Phytophthora community composition of the French Guiana rainforest was significantly impacted by the host plant family and environment. However, these plant pathogen communities are very small and are dominated by generalist species, questioning their potential roles as drivers of plant diversity in these Amazonian forests. © 2020 Society for Applied Microbiology and John Wiley & Sons Ltd.  
  Address International Center for Tropical Botany, Department of Biological Sciences, Florida International University, Miami, FL 33199, United States  
  Corporate Author Thesis  
  Publisher Blackwell Publishing Ltd Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 14622912 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 940  
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Author Rutishauser, E.; Wagner, F.; Herault, B.; Nicolini, E.A.; Blanc, L. openurl 
  Title Contrasting above-ground biomass balance in a Neotropical rain forest Type Journal Article
  Year 2010 Publication Journal of Vegetation Science Abbreviated Journal J. Veg. Sci.  
  Volume (down) 21 Issue 4 Pages 672-682  
  Keywords Biomass balance; Biomass fluxes; Forest dynamics; Permanent plots; Tropical forests  
  Abstract Question What are the relative roles of tree growth, mortality and recruitment in variations of above-ground biomass in tropical forests? Location Paracou, French Guiana. Methods We quantified the contribution of growth, recruitment and mortality to total biomass of stands (trees DBH >= 10 cm) in six 6.25-ha permanent plots over 16 yr. Live biomass stocks and fluxes were computed for four separate size classes. Results All plots showed increasing biomass stocks over the study period, with an average value of +0.9 Mg ha-1 yr-1. Plots aggrading biomass were characterized by either minor biomass losses due to mortality or substantial increases in the biomass of large trees (DBH >= 60 cm). Conclusions Within the study period, the rarity of mortality events could not counter-balance the slow permanent increase in biomass, resulting in an apparent increase in biomass. Accounting for such rare events results in no net change in biomass balance.  
  Address [Rutishauser, Ervan; Nicolini, Eric-Andre] Cirad, UMR AMAP, Kourou 97379, French Guiana, Email: ervan.rutishauser@cirad.fr  
  Corporate Author Thesis  
  Publisher WILEY-BLACKWELL PUBLISHING, INC Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1100-9233 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000279450200005 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 52  
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Author Ruelle, J.; Yoshida, M.; Clair, B.; Thibaut, B. openurl 
  Title Peculiar tension wood structure in Laetia procera (Poepp.) Eichl. (Flacourtiaceae) Type Journal Article
  Year 2007 Publication Trees-Structure and Function Abbreviated Journal Trees-Struct. Funct.  
  Volume (down) 21 Issue 3 Pages 345-355  
  Keywords tension wood; tropical rainforest species; UV microspectrophotometry; scanning electron microscopy; cellulose microfibril angle  
  Abstract Tension wood of Laetia procera (Poepp.) Eichl. (Flacourtiaceae), a neo-tropical forest species, shows a peculiar secondary wall structure, with an alternance of thick and thin layers, while opposite wood of this species has a typical secondary wall structure (S1 + S2 + S3). Samples for the study of microstructural properties were collected upon the estimation of growth stresses in the living tree, in order to analyze the correlation of the former with the latter. Investigation using optical microscopy, scanning electron microscopy and UV microspectrophotometry allowed the description of the anatomy, ultra-structure and chemistry of this peculiar polylaminate secondary wall. In the thick layers, cellulose microfibril angle is very low (i.e., microfibril orientation is close to fibre axis) and cellulose microfibrils are well organized and parallel to each other. In the thin layers, microfibrils (only observable in the inner layer) are less organized and are oriented with a large angle relative to the axis of the cell. Thick layers are lightly lignified although thin layers show a higher content of lignin, close to that of opposite wood secondary wall. The more the wood was under tensile stress, the less the secondary wall was lignified, and lower the syringyl on guaiacyl lignin units' ratio was. The innermost layer of the secondary wall looks like a typical S3 layer with large microfibril angle and lignin occurrence. The interest of this kind of structure for the understanding of stress generation is discussed.  
  Address UMR EcoFoG, Kourou 97387, French Guiana, Email: ruelle_j@kourou.cirad.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 0931-1890 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000246206200009 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 163  
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Author Bereau, M.; Bonal, D.; Louisanna, E.; Garbaye, J. openurl 
  Title Do mycorrhizas improve tropical tree seedling performance under water stress and low light conditions? A case study with Dicorynia guianensis (Caesalpiniaceae) Type Journal Article
  Year 2005 Publication Journal of Tropical Ecology Abbreviated Journal J. Trop. Ecol.  
  Volume (down) 21 Issue Pages 375-381  
  Keywords French Guiana; leaf gas exchange; mycorrhizal symbiosis; tropical forest; water limitation  
  Abstract We tested the response of seedlings of Diconyina guianensis, a major timber tree species of French Guiana, to mycorrhizal symbiosis and water limitation in a semi-con trolled experiment under natural light conditions. Under well-watered conditions, mycorrhizal colonization resulted in an increase of net photosynthesis, growth and phosphorus uptake. When submitted to water stress, no growth reduction of mycorrhizal seedlings was observed. Mycorrhizal seedlings were more sensitive to drought than non-mycorrhizal ones in terms of carbon assimilation, but not with regard to stomatal closure. In contrast to previous studies on temperate tree seedlings, this result precludes a mycorrhizal effect on the hydraulic properties of this species. Furthermore, our results suggest that below a specific threshold of soil moisture, carbon assimilation of D. guianensis seedlings was decreased by the mycorrhizal symbiosis. This is probably related to the competition between the plant and its host fungus for carbon allocation under low light intensity, even though it did not seem to have a significant effect on mortality in our experiment.  
  Address UMR Ecofog, Kourou 97387, French Guiana, Email: bercau.m@kourou.cirad.fr  
  Corporate Author Thesis  
  Publisher CAMBRIDGE UNIV PRESS Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0266-4674 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000231009300003 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 232  
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Author Lenoir, A.; Touchard, A.; Devers, S.; Christidès, J.-P.; Boulay, R.; Cuvillier-Hot, V. doi  openurl
  Title Ant cuticular response to phthalate pollution Type Journal Article
  Year 2014 Publication Environmental Science and Pollution Research Abbreviated Journal Environ. Sci. Pollut. Res.  
  Volume (down) 21 Issue 23 Pages 13446-13451  
  Keywords Absorption; Ants; Bbp; Bioindicator; Cuticle; Dbp; Dehp; DiBP; Phthalates; Pollutants  
  Abstract Phthalates are common atmospheric contaminants used in the plastic industry. Ants have been shown to constitute good bioindicators of phthalate pollution. Hence, phthalates remain trapped on ant cuticles which are mostly coated with long-chain hydrocarbons. In this study, we artificially contaminated Lasius niger ants with four phthalates: dibutyl phthalate (DBP), diisobutyl phthalate (DiBP), di(2-ethylhexyl) phthalate (DEHP), and benzyl butyl phthalate (BBP). The first three have previously been found on ants in nature in Touraine (France), while the fourth has not. The four phthalates disappeared rapidly (less than 5 days) from the cuticles of live ants. In contrast, on the cuticles of dead ants, DEHP quantities remained unchanged over time. These results indicate that phthalates are actively absorbed by the cuticles of live ants. Cuticular absorption of phthalates is nonspecific because eicosane, a nonnatural hydrocarbon on L. niger cuticle, was similarly absorbed. Ants are important ecological engineers and may serve as bioindicators of ecosystem health. We also suggest that ants and more generally terrestrial arthropods may contribute to the removal of phthalates from the local environment.  
  Address CNRS, UMR Écologie des Forêts de Guyane (EcoFoG), Campus Agronomique, BP 316Kourou Cedex, France  
  Corporate Author Thesis  
  Publisher Springer Verlag Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 09441344 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 5 December 2014; Coden: Esple; Correspondence Address: Lenoir, A.; IRBI, Institut de Recherche sur la Biologie de l’Insecte, UMR CNRS 7261, Université François RabelaisFrance Approved no  
  Call Number EcoFoG @ webmaster @ Serial 570  
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