| Records |
| Author |
Conte, D.E.; Aboulaich, A.; Robert, F.; Olivier-Fourcade, J.; Jumas, J.C.; Jordy, C.; Willmann, P. |
| Title |
Sn-x[BPO4](1-x) composites as negative electrodes for lithium ion cells: Comparison with amorphous SnB0.6P0.4O2.9 and effect of composition |
Type |
Journal Article |
| Year |
2010 |
Publication |
Journal of Solid State Chemistry |
Abbreviated Journal |
J. Solid State Chem. |
| Volume |
183 |
Issue |
1 |
Pages |
65-75 |
| Keywords |
Sn-based composites; Lithium-ion batteries; Negative electrodes; Mossbauer spectroscopy; LixSn alloys |
| Abstract |
A comparative study of two Sn-based composite materials as negative electrode for Li-ion accumulators is presented. The former SnB0.6P0.4O2.9 obtained by in-situ dispersion of SnO in an oxide matrix is shown to be an amorphous tin composite oxide (ATCO). The latter Sn-0.72[BPO4](0.28) obtained by ex-situ dispersion of Sri in a borophosphate matrix consists of Sri particles embedded in a crystalline BPO4 matrix. The electrochemical responses of ATCO and Sn-0.72.[BPO4](0.28) composite in galvanostatic mode show reversible capacities of about 450 and 530 mAhg(-1), respectively, with different irreversible capacities (60% and 29%). Analysis of these composite materials by Sn-119 Mossbauer spectroscopy in transmission (TMS) and emission (CEMS) modes confirms that ATCO is an amorphous Sn-II composite oxide and shows that in the case of Sn-0.72[BPO4](0.28), the Surface of the tin clusters is mainly formed by Sn-II in an amorphous interface whereas the bulk of the clusters is mainly formed by Sn-0. The determination of the recoilless free fractions f (Lamb-Mossbauer factors) leads to the effective fraction of both Sn-0 and Sn-II species in such composites. The influence of chemical composition and especially of the surface-to-bulk tin species ratio oil the electrochemical behaviour has been analysed for several Sn-x[BPO4](1-x) composite materials (0.17 < x < 0.91). The cell using the compound Sn-0.72[BPO4](0.28) as active material exhibits interesting electrochemical performances (reversible capacity of 500 mAh g(-1) at C/5 rate). (C) 2009 Elsevier Inc. All rights reserved. |
| Address |
[Conte, Donato Ercole; Aboulaich, Abdelmaula; Robert, Florent; Olivier-Fourcade, Josette; Jumas, Jean-Claude] Univ Montpellier 2, CNRS, UMR 5253,Inst Charles Gerhardt, Equipe Agregats Interfaces & Mat Energie, F-34095 Montpellier, France, Email: iguanasornione@libero.it |
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ACADEMIC PRESS INC ELSEVIER SCIENCE |
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| ISSN |
0022-4596 |
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Notes  |
ISI:000273834600010 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
83 |
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| Author |
Pickett, K.M.; Carpenter, J.M.; Dejean, A. |
| Title |
“Basal” but not primitive: the nest of Apoica arborea de Saussure, 1854 (Insecta, Hymenoptera, Vespidae, Polistinae) |
Type |
Journal Article |
| Year |
2009 |
Publication |
Zoosystema |
Abbreviated Journal |
Zoosystema |
| Volume |
31 |
Issue |
4 |
Pages |
945-948 |
| Keywords |
Insecta; Hymenoptera; Vespidae; Polistinae; Apoica; social wasps; nest architecture; mosaic evolution |
| Abstract |
The first nest of Apoica arborea ever collected is reported. Characteristics of the unusual nest design are discussed relative to other members of the genus Apoica and other epiponine genera. The characteristics of its nest architecture are a mosaic of primitive and derived features for the Polistinae, and thus the nest design is not properly interpreted as the primitive condition from which other swarm-founding wasp nest designs are derived. The frequent conflation of “basal” and primitive is discussed. |
| Address |
[Pickett, Kurt M.] Univ Vermont, Dept Biol, Burlington, VT 05401 USA, Email: kurt.pickett@uvm.edu |
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PUBLICATIONS SCIENTIFIQUES DU MUSEUM, PARIS |
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Edition |
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| ISSN |
1280-9551 |
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| Notes |
ISI:000273733000008 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
188 |
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| Author |
Picard, N.; Mortier, F.; Rossi, V.; Gourlet-Fleury, S. |
| Title |
Clustering species using a model of population dynamics and aggregation theory |
Type |
Journal Article |
| Year |
2010 |
Publication |
Ecological Modelling |
Abbreviated Journal |
Ecol. Model. |
| Volume |
221 |
Issue |
2 |
Pages |
152-160 |
| Keywords |
Aggregation theory; Species grouping; Species richness; Tropical rainforest; Usher model |
| Abstract |
The high species diversity of some ecosystems like tropical rainforests goes in pair with the scarcity of data for most species. This hinders the development of models that require enough data for fitting. The solution commonly adopted by modellers consists in grouping species to form more sizeable data sets. Classical methods for grouping species such as hierarchical cluster analysis do not take account of the variability of the species characteristics used for clustering. In this study a clustering method based on aggregation theory is presented. It takes account of the variability of species characteristics by searching for the grouping that minimizes the quadratic error (square bias plus variance) of some model's prediction. This method allows one to check whether the gain in variance brought by data pooling compensate for the bias that it introduces. This method was applied to a data set on 94 tree species in a tropical rainforest in French Guiana, using a Usher matrix model to predict species dynamics. An optimal trade-off between bias and variance was found when grouping species. Grouping species appeared to decrease the quadratic error, except when the number of groups was very small. This clustering method yielded species groups similar to those of the hierarchical cluster analysis using Ward's method when variance was small, that is when the number of groups was small. (C) 2009 Elsevier B.V. All rights reserved. |
| Address |
[Picard, Nicolas; Mortier, Frederic; Rossi, Vivien; Gourlet-Fleury, Sylvie] CIRAD, F-34398 Montpellier 5, France, Email: nicolas.picard@cirad.fr |
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| Publisher |
ELSEVIER SCIENCE BV |
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Edition |
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| ISSN |
0304-3800 |
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| Notes |
ISI:000273628800004 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
85 |
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| Author |
Aimene, Y.; Vidal-Salle, E.; Hagege, B.; Sidoroff, F.; Boisse, P. |
| Title |
A Hyperelastic Approach for Composite Reinforcement Large Deformation Analysis |
Type |
Journal Article |
| Year |
2010 |
Publication |
Journal of Composite Materials |
Abbreviated Journal |
J. Compos Mater. |
| Volume |
44 |
Issue |
1 |
Pages |
5-26 |
| Keywords |
hyperelasticity; woven reinforcements; forming; fabric mechanical behavior; finite element |
| Abstract |
A hyperelastic constitutive model is developed for textile composite reinforcement at large strain. A potential is proposed, which is the addition of two tension and one shear energies. The proposed potential is a function of the right Cauchy Green and structural tensor invariants whose choice corresponds to textile composite reinforcement mechanical behavior which exhibits weak elongations in the fiber directions and large angular variations in the fabric plane. The model is implemented in a Vumat user routine of ABAQUS/Explicit. Some elementary tests are performed in order to identify the model and verify its validity. It is then used to simulate the hemispherical punch forming of balanced and unbalanced fabrics. A correct agreement is obtained with experimental forming processes. |
| Address |
[Aimene, Y.; Vidal-Salle, E.; Boisse, P.] Univ Lyon, INSA Lyon, LaMCoS, F-69621 Villeurbanne, France, Email: philippe.boisse@insa-lyon.fr |
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| Publisher |
SAGE PUBLICATIONS LTD |
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Edition |
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| ISSN |
0021-9983 |
ISBN |
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| Notes |
ISI:000273509100001 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
84 |
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| Author |
Baraloto, C.; Paine, C.E.T.; Patino, S.; Bonal, D.; Herault, B.; Chave, J. |
| Title |
Functional trait variation and sampling strategies in species-rich plant communities |
Type |
Journal Article |
| Year |
2010 |
Publication |
Functional Ecology |
Abbreviated Journal |
Funct. Ecol. |
| Volume |
24 |
Issue |
1 |
Pages |
208-216 |
| Keywords |
French Guiana; functional diversity; plant traits; specific leaf area; wood density; sampling design; tropical forest |
| Abstract |
P> Despite considerable interest in the application of plant functional traits to questions of community assembly and ecosystem structure and function, there is no consensus on the appropriateness of sampling designs to obtain plot-level estimates in diverse plant communities. We measured 10 plant functional traits describing leaf and stem morphology and ecophysiology for all trees in nine 1-ha plots in terra firme lowland tropical rain forests of French Guiana (N = 4709). We calculated, by simulation, the mean and variance in trait values for each plot and each trait expected under seven sampling methods and a range of sampling intensities. Simulated sampling methods included a variety of spatial designs, as well as the application of existing data base values to all individuals of a given species. For each trait in each plot, we defined a performance index for each sampling design as the proportion of resampling events that resulted in observed means within 5% of the true plot mean, and observed variance within 20% of the true plot variance. The relative performance of sampling designs was consistent for estimations of means and variances. Data base use had consistently poor performance for most traits across all plots, whereas sampling one individual per species per plot resulted in relatively high performance. We found few differences among different spatial sampling strategies; however, for a given strategy, increased intensity of sampling resulted in markedly improved accuracy in estimates of trait mean and variance. We also calculated the financial cost of each sampling design based on data from our 'every individual per plot' strategy and estimated the sampling and botanical effort required. The relative performance of designs was strongly positively correlated with relative financial cost, suggesting that sampling investment returns are relatively constant. Our results suggest that trait sampling for many objectives in species-rich plant communities may require the considerable effort of sampling at least one individual of each species in each plot, and that investment in complete sampling, though great, may be worthwhile for at least some traits. |
| Address |
[Baraloto, Christopher; Patino, Sandra; Bonal, Damien] INRA, UMR Ecol Forets Guyane, F-97387 Kourou, French Guiana, Email: chris.baraloto@ecofog.gf |
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WILEY-BLACKWELL PUBLISHING, INC |
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Edition |
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| ISSN |
0269-8463 |
ISBN |
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| Notes |
ISI:000273455500024 |
Approved |
no |
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EcoFoG @ eric.marcon @ |
Serial |
72 |
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| Author |
Ferrer, A.; Dixon, A.F.; Gibernau, M.; Hemptinne, J.L. |
| Title |
Ovarian dynamics and specialisation in ladybirds |
Type |
Journal Article |
| Year |
2010 |
Publication |
Ecological Entomology |
Abbreviated Journal |
Ecol. Entomol. |
| Volume |
35 |
Issue |
1 |
Pages |
100-103 |
| Keywords |
Ladybird beetles; oocyte resorption; ovarian dynamics; specialisation |
| Abstract |
2. This hypothesis was tested by comparing a generalist and a specialist ladybird species belonging to the same genus. 3. A resorption index was calculated for females of both species subjected to several starvation regimes. This index indicated that over a period of fasting of 3 days, the intensity of resorption was greater in the generalist than the specialist. When food was again supplied, oogenesis resumed and within 1 day was faster in the generalist than in the specialist. 4. As predicted, the resorption of oocytes and replenishment occurred faster in the generalist than in the specialist species. This is the first time, to our knowledge, that the speed and intensity of the ovarian dynamics of a predatory insect have been linked to its way of life. |
| Address |
[Ferrer, Aurelie; Hemptinne, Jean-Louis] Univ Toulouse ENFAT, CNRS, UMR 5174, F-31326 Castanet Tolosan, France, Email: jean-louis.hemptinne@educagri.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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| ISSN |
0307-6946 |
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| Notes |
ISI:000273454300013 |
Approved |
no |
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EcoFoG @ eric.marcon @ |
Serial |
86 |
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| Author |
Courtois, E.A.; Paine, C.E.T.; Blandinieres, P.A.; Stien, D.; Bessiere, J.M.; Houel, E.; Baraloto, C.; Chave, J. |
| Title |
Diversity of the Volatile Organic Compounds Emitted by 55 Species of Tropical Trees: a Survey in French Guiana |
Type |
Journal Article |
| Year |
2009 |
Publication |
Journal of Chemical Ecology |
Abbreviated Journal |
J. Chem. Ecol. |
| Volume |
35 |
Issue |
11 |
Pages |
1349-1362 |
| Keywords |
VOCs; Chemical diversity; Sesquiterpenes; Tropical; French Guiana |
| Abstract |
Volatile organic compounds (VOCs) are produced by a broad range of organisms, from bacteria to mammals, and they represent a vast chemical diversity. In plants, one of the preeminent roles of VOCs is their repellent or cytotoxic activity, which helps the plant deter its predators. Most studies on VOCs emitted by vegetative parts have been conducted in model plant species, and little is known about patterns of VOC emissions in diverse plant communities. We conducted a survey of the VOCs released immediately after mechanical damage of the bark and the leaves of 195 individual trees belonging to 55 tropical tree species in a lowland rainforest of French Guiana. We discovered a remarkably high chemical diversity, with 264 distinct VOCs and a mean of 37 compounds per species. Two monoterpenes (alpha-pinene and limonene) and two sesquiterpenes (beta-caryophyllene and alpha-copaene), which are known to have cytotoxic and deterrent effects, were the most frequent compounds in the sampled species. As has been established for floral scents, the blend of VOCs is largely species-specific and could be used to discriminate among 43 of the 55 sampled species. The species with the most diverse blends were found in the Sapindales, Laurales, and Magnoliales, indicating that VOC diversity is not uniformly distributed among tropical species. Interspecific variation in chemical diversity was caused mostly by variation in sesquiterpenes. This study emphasizes three aspects of VOC emission by tropical tree species: the species-specificity of the mixtures, the importance of sesquiterpenes, and the wide-ranging complexity of the mixtures. |
| Address |
[Courtois, Elodie A.; Blandinieres, Pierre-Alain; Stien, Didier; Houel, Emeline] CNRS, UMR Ecofog, F-97337 Cayenne, France, Email: courtois@cict.fr |
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SPRINGER |
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Edition |
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| ISSN |
0098-0331 |
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| Notes |
ISI:000273086100009 |
Approved |
no |
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EcoFoG @ eric.marcon @ |
Serial |
73 |
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| Author |
Gonzalez, M.A.; Roger, A.; Courtois, E.A.; Jabot, F.; Norden, N.; Paine, C.E.T.; Baraloto, C.; Thebaud, C.; Chave, J. |
| Title |
Shifts in species and phylogenetic diversity between sapling and tree communities indicate negative density dependence in a lowland rain forest |
Type |
Journal Article |
| Year |
2010 |
Publication |
Journal of Ecology |
Abbreviated Journal |
J. Ecol. |
| Volume |
98 |
Issue |
1 |
Pages |
137-146 |
| Keywords |
APG II plus rbcL megatree; density dependence; DNA barcoding; French Guiana; phylogenetic diversity; species diversity; tropical plant communities |
| Abstract |
P>1. As trees in a given cohort progress through ontogeny, many individuals die. This risk of mortality is unevenly distributed across species because of many processes such as habitat filtering, interspecific competition and negative density dependence. Here, we predict and test the patterns that such ecological processes should inscribe on both species and phylogenetic diversity as plants recruit from saplings to the canopy. 2. We compared species and phylogenetic diversity of sapling and tree communities at two sites in French Guiana. We surveyed 2084 adult trees in four 1-ha tree plots and 943 saplings in sixteen 16-m2 subplots nested within the tree plots. Species diversity was measured using Fisher's alpha (species richness) and Simpson's index (species evenness). Phylogenetic diversity was measured using Faith's phylogenetic diversity (phylogenetic richness) and Rao's quadratic entropy index (phylogenetic evenness). The phylogenetic diversity indices were inferred using four phylogenetic hypotheses: two based on rbcLa plastid DNA sequences obtained from the inventoried individuals with different branch lengths, a global phylogeny available from the Angiosperm Phylogeny Group, and a combination of both. 3. Taxonomic identification of the saplings was performed by combining morphological and DNA barcoding techniques using three plant DNA barcodes (psbA-trnH, rpoC1 and rbcLa). DNA barcoding enabled us to increase species assignment and to assign unidentified saplings to molecular operational taxonomic units. 4. Species richness was similar between saplings and trees, but in about half of our comparisons, species evenness was higher in trees than in saplings. This suggests that negative density dependence plays an important role during the sapling-to-tree transition. 5. Phylogenetic richness increased between saplings and trees in about half of the comparisons. Phylogenetic evenness increased significantly between saplings and trees in a few cases (4 out of 16) and only with the most resolved phylogeny. These results suggest that negative density dependence operates largely independently of the phylogenetic structure of communities. 6. Synthesis. By contrasting species richness and evenness across size classes, we suggest that negative density dependence drives shifts in composition during the sapling-to-tree transition. In addition, we found little evidence for a change in phylogenetic diversity across age classes, suggesting that the observed patterns are not phylogenetically constrained. |
| Address |
[Gonzalez, Mailyn A.; Roger, Aurelien; Courtois, Elodie A.; Jabot, Franck; Norden, Natalia; Thebaud, Christophe; Chave, Jerome] Univ Toulouse 3, Lab Evolut & Diversite Biol, UMR 5174, CNRS, F-31062 Toulouse, France, Email: gonzalez.mailyn@gmail.com |
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| Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
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0022-0477 |
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| Notes |
ISI:000272657400015 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
88 |
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| Author |
Ferry, B.; Morneau, F.; Bontemps, J.D.; Blanc, L.; Freycon, V. |
| Title |
Higher treefall rates on slopes and waterlogged soils result in lower stand biomass and productivity in a tropical rain forest |
Type |
Journal Article |
| Year |
2010 |
Publication |
Journal of Ecology |
Abbreviated Journal |
J. Ecol. |
| Volume |
98 |
Issue |
1 |
Pages |
106-116 |
| Keywords |
biomass; community ecology; growth; mortality; productivity; soil waterlogging; topography; treefall; tropical moist forest; wood density |
| Abstract |
P>1. Relationships between tropical rain forest biomass and environmental factors have been determined at regional scales, e.g. the Amazon Basin, but the reasons for the high variability in forest biomass at local scales are poorly understood. Interactions between topography, soil properties, tree growth and mortality rates, and treefalls are a likely reason for this variability. 2. We used repeated measurements of permanent plots in lowland rain forest in French Guiana to evaluate these relationships. The plots sampled topographic gradients from hilltops to slopes to bottomlands, with accompanying variation in soil waterlogging along these gradients. Biomass was calculated for > 175 tree species in the plots, along with biomass productivity and recruitment rates. Mortality was determined as standing dead and treefalls. 3. Treefall rates were twice as high in bottomlands as on hilltops, and tree recruitment rates, radial growth rates and the abundance of light-demanding tree species were also higher. 4. In the bottomlands, the mean wood density was 10% lower than on hilltops, the basal area 29% lower and the height:diameter ratio of trees was lower, collectively resulting in a total woody biomass that was 43% lower in bottomlands than on hilltops. 5. Biomass productivity was 9% lower in bottomlands than on hilltops, even though soil Olsen P concentrations were higher in bottomlands. 6. Synthesis. Along a topographic gradient from hilltops to bottomlands there were higher rates of treefall, which decreased the stand basal area and favoured lower allocation to height growth and recruitment of light-demanding species with low wood density. The resultant large variation in tree biomass along the gradient shows the importance of determining site characteristics and including these characteristics when scaling up biomass estimates from stand to local or regional scales. |
| Address |
[Ferry, Bruno; Morneau, Francois; Bontemps, Jean-Daniel] AgroParisTech, ENGREF Nancy, UMR 1092, CS 14216, F-54000 Nancy, France, Email: bruno.ferry@engref.agroparistech.fr |
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| Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
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0022-0477 |
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| Notes |
ISI:000272657400012 |
Approved |
no |
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EcoFoG @ eric.marcon @ |
Serial |
87 |
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| Author |
Barriault, I.; Barabe, D.; Cloutier, L.; Gibernau, M. |
| Title |
Pollination ecology and reproductive success in Jack-in-the-pulpit (Arisaema triphyllum) in Quebec (Canada) |
Type |
Journal Article |
| Year |
2010 |
Publication |
Plant Biology |
Abbreviated Journal |
Plant Biol. |
| Volume |
12 |
Issue |
1 |
Pages |
161-171 |
| Keywords |
Araceae; bisexual inflorescence; deceptive pollination; Mycetophilidae; pollen load; Thysanoptera; visitation rates |
| Abstract |
Pollination ecology and reproductive success of Jack-in-the-pulpit (Arisaema triphyllum) were studied in two natural populations in Quebec, Canada. Individual A. triphyllum plants can be of three types: male, female or bisexual. In both populations studied, the presence of bisexual inflorescences was not negligible (13%), where 'female' and 'male' bisexual plants were categorised according to the relative number of stamens and ovaries. 'Male bisexual' plants produce only pollen and 'female bisexual' plants produce only fruit. Hence, A. triphyllum is a true dioecious plant, as each plant only reproduces through either the male or the female function. 'Female bisexual' plants were equivalent to female plants in terms of visitation rate by insects, fructification rate and production of berries and seeds. Neither agamospermy in female plants nor self-pollination in 'female bisexual' plants was found, thus A. triphyllum relies on insects for cross-pollination. Despite the long flowering cycle, a low visitation rate was documented: only 20-40% of inflorescences were visited, according to gender, by a mean of 1.5 insects. In this study, Mycetophilidae represented the most generically diversified and abundant family, as well as the most efficient insect pollinator, especially the genera Docosia and Mycetophila. |
| Address |
[Gibernau, M.] Univ Toulouse 3, Lab Evolut & Divers Biol, UMR, CNRS, F-31062 Toulouse 9, France, Email: gibernau@cict.fr |
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| Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
Place of Publication |
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Summary Language |
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Series Issue |
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Edition |
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| ISSN |
1435-8603 |
ISBN |
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| Notes |
ISI:000272589700017 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
89 |
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