| Records |
| Author |
Suedile, F.; Robert, F.; Roos, C.; Lebrini, M. |
| Title |
Corrosion inhibition of zinc by Mansoa alliacea plant extract in sodium chloride media: Extraction, Characterization and Electrochemical Studies |
Type |
Journal Article |
| Year |
2014 |
Publication |
Electrochimica Acta |
Abbreviated Journal |
Electrochim Acta |
| Volume |
133 |
Issue |
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Pages  |
631-638 |
| Keywords |
Corrosion; Inhibition; Mansoa alliacea; sodium chloride; zinc |
| Abstract |
Ethanol extract of Mansoa alliacea was tested as corrosion inhibitor for zinc in NaCl 3% media using polarization and electrochemical impedance spectroscopy (EIS). Potentiodynamic polarization curves indicated that the plant extract behaves as mixed-type inhibitor. Impedance measurements showed that there are two phenomena in the process of inhibition. The results obtained show that this plant extract could serve as an effective inhibitor for the corrosion of zinc in NaCl 3% media. The extract obtained give inhibition around 90%. The experimental data obtained from EIS method show a frequency distribution and therefore a modelling element with frequency dispersion behaviour, a constant phase element (CPEα,Q) has been used. Graphical methods are illustrated by synthetic data to determine the parameter of CPE (α, Q). Polarization curves show that Mansoa alliacea extract affects the anodic and cathodic reactions and the corrosion potential values were shifted to the positive potentials in the presence of the crude extract. Studies on the phytochemical constituents of the total extract were also established. Electrochemical studies, on the chemical families present in the crude extract, were also carried out to find the main constituents responsible for corrosion inhibition properties of the plant extract. © 2014 Elsevier Ltd. |
| Address |
Laboratoire Matériaux et Molécules en Milieux Amazonien, UAG – UMR ECOFOG Campus Troubiran, Route de Baduel, 97337 Cayenne, French Guiana |
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Elsevier Ltd |
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00134686 (Issn) |
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Export Date: 18 June 2014; Coden: Elcaa; Correspondence Address: Lebrini, M.; Laboratoire Matériaux et Molécules en Milieux Amazonien, UAG – UMR ECOFOG Campus Troubiran, Route de Baduel, 97337 Cayenne, French Guiana; email: mounim.lebrini@guyane.univ-ag.fr |
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EcoFoG @ webmaster @ |
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548 |
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| Author |
Coq, S.; Weigel, J.; Bonal, D.; Hattenschwiler, S. |
| Title |
Litter mixture effects on tropical tree seedling growth – a greenhouse experiment |
Type |
Journal Article |
| Year |
2012 |
Publication |
Plant Biology |
Abbreviated Journal |
Plant Biol. |
| Volume |
14 |
Issue |
4 |
Pages |
630-640 |
| Keywords |
Amazonian lowland rain forest; Autotoxicity; Belowground/aboveground interactions; Litter decomposition; Plant nutrition; Plant-soil feedback |
| Abstract |
Decomposing litter provides critical nutrients for plants, particularly in nutrient-poor ecosystems such as tropical forests. We hypothesised that decomposing litter improves the performance of a variety of tropical tree seedlings, and that this litter effect varies depending on the species of litter present in litter mixtures. We addressed these hypotheses with a large pot experiment manipulating a range of different litter mixtures of contrasting quality and using seedlings of four tree species from the Amazonian forest of French Guiana. In contrast to our initial hypothesis, decomposing litter had either neutral or negative impacts on seedling growth, despite strongly different growth rates, biomass allocation patterns and leaf and root traits among tree species. Tree species varied in their responses to litter additions, which were further modified by species identity of the added litter. Our data show litter species-specific effects on growth, biomass allocation and leaf and root traits of tropical tree seedlings. These results suggest that a net nutrient release from decomposing litter does not necessarily improve tree seedling growth, even under nutrient-limiting conditions. In conclusion, litter layer composition may affect seedling establishment and recruitment success beyond litter-derived plant nutrient availability, which may contribute to tree species composition and dynamics in the studied tropical forest. © 2012 German Botanical Society and The Royal Botanical Society of the Netherlands. |
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INRA, UMR, Écologie et Écophysiologie, Champenoux, France |
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14358603 (Issn) |
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Export Date: 27 June 2012; Source: Scopus; Coden: Pbiof; doi: 10.1111/j.1438-8677.2011.00534.x; Language of Original Document: English; Correspondence Address: Coq, S.; Laboratoire d'Ecologie Alpine (LECA), CNRS, Université Joseph Fourier, BP 53, F-38042 Grenoble, Cedex 09, France; email: sylvain.coq@gmail.com |
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EcoFoG @ webmaster @ |
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407 |
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Dejean, A.; Azémar, F.; Céréghino, R.; Leponce, M.; Corbara, B.; Orivel, J.; Compin, A. |
| Title |
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 |
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Export Date: 1 September 2016 |
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no |
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EcoFoG @ webmaster @ |
Serial |
689 |
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Liu, S.Q.; Loup, C.; Gril, J.; Dumonceaud, O.; Thibaut, A.; Thibaut, B. |
| Title |
Studies on European beech (Fagus sylvatica L.). Part 1: Variations of wood colour parameters |
Type |
Journal Article |
| Year |
2005 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
| Volume |
62 |
Issue |
7 |
Pages |
625-632 |
| Keywords |
Fagus sylvatica L.; CIELab colour system; solid wood; red heartwood |
| Abstract |
Colour parameters of European beech were measured using CIELab system. 103 logs from 87 trees in 9 sites were cut into boards to study the radial variations of wood colour parameters. Both site and tree effects on colour were observed. Patterns of red heartwood occurrence were defined. When excepting red heartwood there was still a highly significant effect of site and tree. Axial and radial variations were small, except very near the pith or in red heartwood, suggesting possible early selection at periphery under colour criteria. Red heartwood is darker, redder and more yellow than normal peripheral wood. |
| Address |
Univ Montpellier 2, Lab Mecan & Genie Civil, F-34095 Montpellier, France, Email: jgril@lmgc.univ-montp2.fr |
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EDP SCIENCES S A |
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1286-4560 |
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ISI:000233179100003 |
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no |
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EcoFoG @ eric.marcon @ |
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251 |
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Leguet, A.; Gibernau, M.; Shintu, L.; Caldarelli, S.; Moja, S.; Baudino, S.; Caissard, J.-C. |
| Title |
Evidence for early intracellular accumulation of volatile compounds during spadix development in Arum italicum L. and preliminary data on some tropical Aroids |
Type |
Journal Article |
| Year |
2014 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
| Volume |
101 |
Issue |
8 |
Pages |
623-635 |
| Keywords |
Araceae; Cytochemistry; Gas chromatography; Nuclear magnetic resonance; Volatile compounds |
| Abstract |
Staining and histochemistry of volatile organic compounds (VOCs) were performed at different inflorescence developmental stages on nine aroid species; one temperate, Arum italicum and eight tropical from the genera Caladium, Dieffenbachia and Philodendron. Moreover, a qualitative and quantitative analysis of VOCs constituting the scent of A. italicum, depending on the stage of development of inflorescences was also conducted. In all nine species, vesicles were observed in the conical cells of either the appendix or the stamens (thecae) and the staminodes. VOCs were localised in intracellular vesicles from the early stages of inflorescence development until their release during receptivity of gynoecium. This localisation was observed by the increase of both number and diameter of the vesicles during 1 week before receptivity. Afterwards, vesicles were fewer and smaller but rarely absent. In A. italicum, staining and gas chromatography analyses confirmed that the vesicles contained terpenes. The quantitatively most important ones were the sesquiterpenes, but monoterpenes were not negligible. Indeed, the quantities of terpenes matched the vesicles' size evolution during 1 week. Furthermore, VOCs from different biosynthetic pathways (sesquiterpenes and alkanes) were at their maximum quantity 2 days before gynoecium receptivity (sesquiterpenes and alkanes) or during receptivity (isobutylamine, monoterpenes, skatole and p-cresol). VOCs seemed to be emitted during gynoecium receptivity and/or during thermogenesis, and FADs are accumulated after thermogenesis in the spadix. These complex dynamics of the different VOCs could indicate specialisation of some VOCs and cell machinery to attract pollinators on the one hand and to repulse/protect against phytophagous organisms and pathogens after pollination on the other hand. © 2014 Springer-Verlag Berlin Heidelberg. |
| Address |
CNRS, UMR-6134 SPE, 20000 Ajaccio, France |
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Springer Verlag |
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00281042 (Issn) |
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Export Date: 1 September 2014; Coden: Natwa; Correspondence Address: Gibernau, M.; CNRS, UMR-6134 SPE, 20000 Ajaccio, France; email: gibernau@univ-corse.fr |
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no |
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EcoFoG @ webmaster @ |
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558 |
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| Author |
Clair, B.; Déjardin, A.; Pilate, G.; Alméras, T. |
| Title |
Is the G-layer a tertiary cell wall? |
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Journal Article |
| Year |
2018 |
Publication |
Frontiers in Plant Science |
Abbreviated Journal |
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| Volume |
9 |
Issue |
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Pages |
623 |
| Keywords |
Flax; G-layer; Gelatinous layer; Maturation stress; Secondary cell wall; Tension wood; Tertiary cell wall |
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LMGC, CNRS, Université de Montpellier, Montpellier, France |
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Export Date: 31 May 2018 |
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no |
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EcoFoG @ webmaster @ |
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805 |
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Vantaux, A.; Roux, O.; Magro, A.; Ghomsi, N.T.; Gordon, R.D.; Dejean, A.; Orivel, J. |
| Title |
Host-Specific Myrmecophily and Myrmecophagy in the Tropical Coccinellid Diomus thoracicus in French Guiana |
Type |
Journal Article |
| Year |
2010 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
| Volume |
42 |
Issue |
5 |
Pages |
622-629 |
| Keywords |
ants; ladybird; mimicry; parasite; Wasmannia auropunctata |
| Abstract |
A variety of arthropods, particularly insects, have developed myrmecophilous interactions with ants to gain access to resources and/or for protection. Among these myrmecophiles, only a few examples have been documented in the Coccinellidae, most of them involving species able to feed on ant-tended Hemiptera. We report here a new case of obligate myrmecophily in the coccinellid Diomus thoracicus. Larvae are invariably and exclusively found in the nests of the ant Wasmannia auropunctata and seem to rely on ant brood as their only food source. Not only do ant workers show no aggressiveness toward the D. thoracicus larvae in their behavioral interactions at the colonial level, but also at the species level; while coccinellid adults are always attacked. The integration of the larvae inside of the ant nests is based on their chemical mimicry of the host's cuticular cues. Therefore, given the presence of the D. thoracicus larvae inside of the ant's nest, their predation on Wasmannia brood and their chemical mimicry, this species can be considered a specific parasite of W. auropunctata. Overall, this new case of myrmecophily not only specifically involves a highly invasive ant species, but also provides insights into the evolution of myrmecophily and myrmecophagy in coccinellids. |
| Address |
[Vantaux, Amelie; Magro, Alexandra; Orivel, Jerome] Univ Toulouse, UPS, EDB Lab Evolut & Diversite Biol, F-31062 Toulouse, France, Email: orivel@cict.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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0006-3606 |
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ISI:000281707700025 |
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EcoFoG @ eric.marcon @ |
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27 |
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Christensen-Dalsgaard, K.K.; Fournier, M.; Ennos, A.R.; Barfod, A.S. |
| Title |
Changes in vessel anatomy in response to mechanical loading in six species of tropical trees |
Type |
Journal Article |
| Year |
2007 |
Publication |
New Phytologist |
Abbreviated Journal |
New Phytol. |
| Volume |
176 |
Issue |
3 |
Pages |
610-622 |
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hydraulic architecture; hydraulic-mechanical trade-off; mechanical adaptation; rooting morphology; tropical trees; vascular anatomy |
| Abstract |
It is well known that trees adapt their supportive tissues to changes in loading conditions, yet little is known about how the vascular anatomy is modified in this process. We investigated this by comparing more and less mechanically loaded sections in six species of tropical trees with two different rooting morphologies. We measured the strain, vessel size, frequency and area fraction and from this calculated the specific conductivity, then measured the conductivity, modulus of elasticity and yield stress. The smallest vessels and the lowest vessel frequency were found in the parts of the trees subjected to the greatest stresses or strains. The specific conductivity varied up to two orders of magnitude between mechanically loaded and mechanically unimportant parts of the root system. A trade-off between conductivity and stiffness or strength was revealed, which suggests that anatomical alterations occur in response to mechanical strain. By contrast, between-tree comparisons showed that average anatomical features for the whole tree seemed more closely related to their ecological strategy. |
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Univ Manchester, Fac Life Sci, Manchester M60 1QD, Lancs, England, Email: karen@cd-mail.dk |
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BLACKWELL PUBLISHING |
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0028-646X |
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ISI:000250275000013 |
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no |
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EcoFoG @ eric.marcon @ |
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156 |
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Verryckt, L.T.; Van Langenhove, L.; Ciais, P.; Courtois, E.A.; Vicca, S.; Peñuelas, J.; Stahl, C.; Coste, S.; Ellsworth, D.S.; Posada, J.M.; Obersteiner, M.; Chave, J.; Janssens, I.A. |
| Title |
Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest |
Type |
Journal Article |
| Year |
2020 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
| Volume |
52 |
Issue |
4 |
Pages |
608-615 |
| Keywords |
branch cutting; canopy physiology; French Guiana; gas exchange; photosynthesis; rainforest; stomatal conductance; ecological modeling; environmental conditions; forest canopy; leaf; measurement method; photosynthesis; tree; tropical forest; Gruidae |
| Abstract |
Measuring leaf gas exchange from canopy leaves is fundamental for our understanding of photosynthesis and for a realistic representation of carbon uptake in vegetation models. Since canopy leaves are often difficult to reach, especially in tropical forests with emergent trees up to 60 m at remote places, canopy access techniques such as canopy cranes or towers have facilitated photosynthetic measurements. These structures are expensive and therefore not very common. As an alternative, branches are often cut to enable leaf gas exchange measurements. The effect of branch excision on leaf gas exchange rates should be minimized and quantified to evaluate possible bias. We compared light-saturated leaf net photosynthetic rates measured on excised and intact branches. We selected branches positioned at three canopy positions, estimated relative to the top of the canopy: upper sunlit foliage, middle canopy foliage, and lower canopy foliage. We studied the variation of the effects of branch excision and transport among branches at these different heights in the canopy. After excision and transport, light-saturated leaf net photosynthetic rates were close to zero for most leaves due to stomatal closure. However, when the branch had acclimated to its new environmental conditions—which took on average 20 min—light-saturated leaf net photosynthetic rates did not significantly differ between the excised and intact branches. We therefore conclude that branch excision does not affect the measurement of light-saturated leaf net photosynthesis, provided that the branch is recut under water and is allowed sufficient time to acclimate to its new environmental conditions. © 2020 The Association for Tropical Biology and Conservation |
| Address |
UMR 5174 Laboratoire Evolution et Diversité Biologique, Université Paul Sabatier, CNRS, Toulouse, France |
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Blackwell Publishing Ltd |
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00063606 (Issn) |
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EcoFoG @ webmaster @ |
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960 |
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Coste, S.; Baraloto, C.; Leroy, C.; Marcon, E.; Renaud, A.; Richardson, A.D.; Roggy, J.C.; Schimann, H.; Uddling, J.; Herault, B. |
| Title |
Assessing foliar chlorophyll contents with the SPAD-502 chlorophyll meter: a calibration test with thirteen tree species of tropical rainforest in French Guiana |
Type |
Journal Article |
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2010 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
| Volume |
67 |
Issue |
6 |
Pages |
607 |
| Keywords |
chlorophyll estimate; model calibration; homographic functions; neotropical trees |
| Abstract |
Chlorophyll meters such as the SPAD-502 offer a simple, inexpensive and rapid method to estimate foliar chlorophyll content. However, values provided by SPAD-502 are unitless and require empirical calibrations between SPAD units and extracted chlorophyll values. Leaves of 13 tree species from the tropical rain forest in French Guiana were sampled to select the most appropriate calibration model among the often-used linear, polynomial and exponential models, in addition to a novel homographic model that has a natural asymptote. The homographic model best accurately predicted total chlorophyll content (mu g cm(-2)) from SPAD units (R-2 = 0.89). Interspecific differences in the homographic model parameters explain less than 7% of the variation in chlorophyll content in our data set. The utility of the general homographic model for a variety of research and management applications clearly outweighs the slight loss of model accuracy due to the abandon of the species' effect. |
| Address |
[Herault, Bruno] Univ Antilles Guyane, Unite Mixte Rech Ecol Forets Guyane, Kourou, France, Email: bruno.herault@ecofog.gf |
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EDP SCIENCES S A |
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1286-4560 |
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ISI:000282350300007 |
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no |
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EcoFoG @ eric.marcon @ |
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40 |
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