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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. |
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Title |
Diversity of the Volatile Organic Compounds Emitted by 55 Species of Tropical Trees: a Survey in French Guiana |
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Journal Article |
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Year |
2009 |
Publication |
Journal of Chemical Ecology |
Abbreviated Journal |
J. Chem. Ecol. |
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Volume |
35 |
Issue |
11 |
Pages |
1349-1362 |
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Keywords |
VOCs; Chemical diversity; Sesquiterpenes; Tropical; French Guiana |
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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. |
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[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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0098-0331 |
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ISI:000273086100009 |
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EcoFoG @ eric.marcon @ |
Serial |
73 |
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Author |
Cabanillas, B.J.; Le Lamer, A.C.; Castillo, D.; Arevalo, J.; Rojas, R.; Odonne, G.; Bourdy, G.; Moukarzel, B.; Sauvain, M.; Fabre, N. |
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Title |
Caffeic Acid Esters and Lignans from Piper sanguineispicum |
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Journal Article |
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Year |
2010 |
Publication |
Journal of Natural Products |
Abbreviated Journal |
J. Nat. Prod. |
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Volume |
73 |
Issue |
11 |
Pages |
1884-1890 |
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Abstract |
Three new caffeic acid esters (1-3), four new lignans (4-7), and the known compounds (7'S)-parabenzlactone (8), dihydrocubebin (9), and justiflorinol (10) have been isolated from leaves of Piper sanguineispicum. Their structures were determined by spectroscopic methods, including 1D and 2D NMR, HRCIMS, CD experiments, and chemical methods. Compounds 1-10 were assessed for their antileishmanial potential against axenic amastigote forms of Leishmania amazonensis. Caffeic acid esters 1 and 3 exhibited the best antileishmanial activity (IC50 2.0 and 1.8 μM, respectively) with moderate cytotoxicity on murine macrophages. |
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[Cabanillas, Billy Joel; Le Lamer, Anne-Cecile; Odonne, Guillaume; Bourdy, Genevieve; Moukarzel, Beatrice; Sauvain, Michel; Fabre, Nicolas] Univ Toulouse, UPS, UMR 152, Lab Pharmacochim Subst Nat & Pharmacophores Redox, F-31062 Toulouse 9, France, Email: michel.sauvain@ird.fr |
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AMER CHEMICAL SOC |
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0163-3864 |
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ISI:000284559100024 |
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EcoFoG @ eric.marcon @ |
Serial |
74 |
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Author |
Roggy, J.C.; Nicolini, E.; Imbert, P.; Caraglio, Y.; Bosc, A.; Heuret, P. |
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Title |
Links between tree structure and functional leaf traits in the tropical forest tree Dicorynia guianensis Amshoff (Caesalpiniaceae) |
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Journal Article |
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Year |
2005 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
62 |
Issue |
6 |
Pages |
553-564 |
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Keywords |
Dicorynia guianensis; leaf structure; functional leaf traits; plasticity; tree structure |
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Abstract |
This study looked at the interactive effects of tree architectural stage of development (ASD) and light availability on different plant traits (growth parameters, leaf morpho-anatomy and photosynthetic capacities) in the tropical species Dicorynia guianensis. A qualitative architectural analysis was used to categorize tree individuals sampled along a natural light gradient. The results show that some traits could have an ASD-dependence at the whole plant and leaf level without control of light. The changes observed relate to vigour thresholds the plant has to reach to shift from one ASD to another (i.e., the number of nodes and the internodes length per Growth Unit). Light conditions do not modify these thresholds but may modify the time they are crossed. Tree height was found strongly modulated by light conditions; hence, at a similar height, individuals may belong to different ASD. At the functional level, a decrease in N-m, and A(maxm) was observed with increasing light availability, while N-a increased and A(maxa) remained unaffected. An ASD effect was also observed on Amaxa and LMA but not on Amaxm. These results demonstrated a weak ability of photosynthetic plasticity in response to light conditions, and that variations of leaf photosynthetic variables according to ASD can be explained by modifications in leaf nitrogen and LMA. Questions on the reliability of a height-based sampling strategy for evaluating the phenotypic plasticity of trees in relation to light conditions are raised. |
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Address |
INRA, Ecol Forets Guyane, ENGREF, UMR CIRAD, F-97387 Kourou, Guyane Francais, France, Email: roggy.j@cirad.fr |
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EDP SCIENCES S A |
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ISSN |
1286-4560 |
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Notes |
ISI:000232084400009 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
229 |
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Author |
Vedel, V.; Scotti, I. |
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Title |
Promoting the promoter |
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Journal Article |
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Year |
2011 |
Publication |
Plant Science |
Abbreviated Journal |
Plant Sci. |
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Volume |
180 |
Issue |
2 |
Pages |
182-189 |
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Keywords |
cis-Regulation; Evolutionary and developmental biology; Integrative evolution; Plant development; Population genetics; Transcription |
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Abstract |
Recent evolutionary studies clearly indicate that evolution is mainly driven by changes in the complex mechanisms of gene regulation and not solely by polymorphism in protein-encoding genes themselves. After a short description of the cis-regulatory mechanism, we intend in this review to argue that by applying newly available technologies and by merging research areas such as evolutionary and developmental biology, population genetics, ecology and molecular cell biology it is now possible to study evolution in an integrative way. We contend that, by analysing the effects of promoter sequence variation on phenotypic diversity in natural populations, we will soon be able to break the barrier between the study of extant genetic variability and the study of major developmental changes. This will lead to an integrative view of evolution at different scales. Because of their sessile nature and their continuous development, plants must permanently regulate their gene expression to react to their environment, and can, therefore, be considered as a remarkable model for these types of studies. (C) 2010 Elsevier Ireland Ltd. All rights reserved. |
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Address |
[Vedel, Vincent; Scotti, Ivan] INRA, UMR ECOFOG, Kourou 97387, French Guiana, Email: vincent.vedel@ecofog.gf |
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ELSEVIER IRELAND LTD |
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0168-9452 |
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Notes |
ISI:000286562200002 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
291 |
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Author |
Gourlet-Fleury, S.; Blanc, L.; Picard, N.; Sist, P.; Dick, J.; Nasi, R.; Swaine, M.D.; Forni, E. |
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Title |
Grouping species for predicting mixed tropical forest dynamics: looking for a strategy |
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Journal Article |
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Year |
2005 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
62 |
Issue |
8 |
Pages |
785-796 |
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Keywords |
cross-comparisons; functional groups; modelling strategy; species classifications |
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The high species diversity of mixed tropical forests hinders the development of forest dynamic models. A solution commonly adopted is to cluster species in groups. There are various methods for grouping species that can be linked to three strategies (i) the ecological subjective strategy, (ii) the ecological data-driven strategy, and (iii) the dynamic process strategy. In the first two strategies a species will be assigned to a single group while in the latter strategy, a specific grouping is defined for each process of population dynamics ( typically based on recruitment, growth, mortality). Little congruency or convergence is observed in the literature between any two classifications of species. This may be explained by the independence between the sets of tree characters used to build species groups, or by the intra-specific variability of these characters. We therefore recommend the dynamic process strategy as the most convenient strategy for building groups of species. |
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Cirad Foret, F-34398 Montpellier, France, Email: sylvie.gourlet-fleury@cirad.fr |
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EDP SCIENCES S A |
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ISSN |
1286-4560 |
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Notes |
ISI:000233972500001 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
228 |
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Permanent link to this record |
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Author |
Dejean, A.; Leroy, C.; Corbara, B.; Cereghino, R.; Roux, O.; Herault, B.; Rossi, V.; Guerrero, R.J.; Delabie, J.H.C.; Orivel, J.; Boulay, R. |
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Title |
A temporary social parasite of tropical plant-ants improves the fitness of a myrmecophyte |
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Journal Article |
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Year |
2010 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
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Volume |
97 |
Issue |
10 |
Pages |
925-934 |
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Keywords |
Ant-plant relationships; Biotic defense; Parasites of mutualisms; Temporary social parasites; Azteca; Cecropia |
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Abstract |
Myrmecophytes offer plant-ants a nesting place in exchange for protection from their enemies, particularly defoliators. These obligate ant-plant mutualisms are common model systems for studying factors that allow horizontally transmitted mutualisms to persist since parasites of ant-myrmecophyte mutualisms exploit the rewards provided by host plants whilst providing no protection in return. In pioneer formations in French Guiana, Azteca alfari and Azteca ovaticeps are known to be mutualists of myrmecophytic Cecropia (Cecropia ants). Here, we show that Azteca andreae, whose colonies build carton nests on myrmecophytic Cecropia, is not a parasite of Azteca-Cecropia mutualisms nor is it a temporary social parasite of A. alfari; it is, however, a temporary social parasite of A. ovaticeps. Contrarily to the two mutualistic Azteca species that are only occasional predators feeding mostly on hemipteran honeydew and food bodies provided by the host trees, A. andreae workers, which also attend hemipterans, do not exploit the food bodies. Rather, they employ an effective hunting technique where the leaf margins are fringed with ambushing workers, waiting for insects to alight. As a result, the host trees' fitness is not affected as A. andreae colonies protect their foliage better than do mutualistic Azteca species resulting in greater fruit production. Yet, contrarily to mutualistic Azteca, when host tree development does not keep pace with colony growth, A. andreae workers forage on surrounding plants; the colonies can even move to a non-Cecropia tree. |
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Address |
[Dejean, Alain; Leroy, Celine; Roux, Olivier; Orivel, Jerome] CNRS, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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0028-1042 |
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ISI:000282094100006 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
77 |
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Foucaud, J.; Estoup, A.; Loiseau, A.; Rey, O.; Orivel, J. |
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Title |
Thelytokous parthenogenesis, male clonality and genetic caste determination in the little fire ant: new evidence and insights from the lab |
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Journal Article |
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Year |
2010 |
Publication |
Heredity |
Abbreviated Journal |
Heredity |
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Volume |
105 |
Issue |
2 |
Pages |
205-212 |
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Keywords |
reproduction system; thelytokous parthenogenesis; male clonality; genetic caste determination; Wasmannia auropunctata |
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Abstract |
Previous studies indicate that some populations of the little fire ant, Wasmannia auropunctata, display an unusual reproduction system polymorphism. Although some populations have a classical haplodiploid reproduction system, in other populations queens are produced by thelytokous parthenogenesis, males are produced by a male clonality system and workers are produced sexually. An atypical genetic caste determination system was also suggested. However, these conclusions were indirectly inferred from genetic studies on field population samples. Here we set up experimental laboratory nests that allow the control of the parental relationships between individuals. The queens heading those nests originated from either putatively clonal or sexual populations. We characterized the male, queen and worker offspring they produced at 12 microsatellite loci. Our results unambiguously confirm the unique reproduction system polymorphism mentioned above and that male clonality is strictly associated with thelytokous parthenogenesis. We also observed direct evidence of the rare production of sexual gynes and arrhenotokous males in clonal populations. Finally, we obtained evidence of a genetic basis for caste determination. The evolutionary significance of the reproduction system polymorphism and genetic caste determination as well as future research opportunities are discussed. Heredity (2010) 105, 205-212; doi: 10.1038/hdy.2009.169; published online 25 November 2009 |
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Address |
[Foucaud, J.; Estoup, A.; Loiseau, A.; Rey, O.] INRA, UMR CBGP, IRD, Cirad,Montpellier SupAgro, Montferrier Sur Lez, France, Email: julien.foucaud@legs.cnrs-gif.fr |
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NATURE PUBLISHING GROUP |
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ISSN |
0018-067X |
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Notes |
ISI:000280111800007 |
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EcoFoG @ eric.marcon @ |
Serial |
78 |
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Foucaud, J.; Orivel, J.; Loiseau, A.; Delabie, J.H.C.; Jourdan, H.; Konghouleux, D.; Vonshak, M.; Tindo, M.; Mercier, J.L.; Fresneau, D.; Mikissa, J.B.; McGlynn, T.; Mikheyev, A.S.; Oettler, J.; Estoup, A. |
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Title |
Worldwide invasion by the little fire ant: routes of introduction and eco-evolutionary pathways |
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Journal Article |
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Year |
2010 |
Publication |
Evolutionary Applications |
Abbreviated Journal |
Evol. Appl. |
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Volume |
3 |
Issue |
4 |
Pages |
363-374 |
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Keywords |
biological invasion; introduction routes; parthenogenesis; reproduction system; Wasmannia auropunctata |
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Biological invasions are generally thought to occur after human aided migration to a new range. However, human activities prior to migration may also play a role. We studied here the evolutionary genetics of introduced populations of the invasive ant Wasmannia auropunctata at a worldwide scale. Using microsatellite markers, we reconstructed the main routes of introduction of the species. We found three main routes of introduction, each of them strongly associated to human history and trading routes. We also demonstrate the overwhelming occurrence of male and female clonality in introduced populations of W. auropunctata, and suggest that this particular reproduction system is under selection in human-modified habitats. Together with previous researches focused on native populations, our results suggest that invasive clonal populations may have evolved within human modified habitats in the native range, and spread further from there. The evolutionarily most parsimonious scenario for the emergence of invasive populations of the little fire ant might thus be a two-step process. The W. auropunctata case illustrates the central role of humans in biological change, not only due to changes in migration patterns, but also in selective pressures over species. |
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Address |
[Foucaud, Julien; Loiseau, Anne; Jourdan, Herve; Konghouleux, Djoel; Estoup, Arnaud] Montpellier SupAgro, INRA, UMR CBGP, IRD,Cirad, F-34988 Montferrier Sur Lez, France, Email: julien.foucaud@legs.cnrs-gif.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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1752-4571 |
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Notes |
ISI:000278913600004 |
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EcoFoG @ eric.marcon @ |
Serial |
79 |
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Author |
Bekaert, E.; Robert, F.; Lippens, P.E.; Menetrier, M. |
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Title |
Li-7 NMR Knight Shifts in Li-Sn Compounds: MAS NMR Measurements and Correlation with DFT Calculations |
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Journal Article |
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Year |
2010 |
Publication |
Journal of Physical Chemistry C |
Abbreviated Journal |
J. Phys. Chem. C |
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Volume |
114 |
Issue |
14 |
Pages |
6749-6754 |
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Abstract |
Several Li-Sn crystalline phases, LiSn. Li7Sn3, Li5Sn7, Li13Sn5, Li7Sn2, and Li22Sn5. were prepared by ball-milling and studied by Li-7 MAS NMR spectroscopy with silica as a chiming agent to avoid field penetration limitations All phases except for LiSn exhibit exchanged NMR signals at room temperature for the various types of Li present in the unit cells. in the 10 to 100 ppm range. Electronic structure calculations based on first-principles method led to a lather good correlation between the participation of the Li 2s orbital to the density of states (DOS) at the Fermi level and the corresponding NMR Knight shift for the two Li crystallographic types in the case of LiSn, and for the weighted average of the different crystallographic types in the case of the NMR-exchanged signals for the other compounds |
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[Bekaert, Emilie; Menetrier, Michel] Univ Bordeaux, CNRS, ICMCB, F-33608 Pessac, France |
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AMER CHEMICAL SOC |
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1932-7447 |
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Notes |
ISI:000276341700075 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
80 |
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Permanent link to this record |
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Author |
Dejean, A.; Fisher, B.L.; Corbara, B.; Rarevohitra, R.; Randrianaivo, R.; Rajemison, B.; Leponce, M. |
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Title |
Spatial Distribution of Dominant Arboreal Ants in a Malagasy Coastal Rainforest: Gaps and Presence of an Invasive Species |
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Journal Article |
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Year |
2010 |
Publication |
PLoS One |
Abbreviated Journal |
PLoS One |
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Volume |
5 |
Issue |
2 |
Pages |
e9319 |
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Abstract |
We conducted a survey along three belt transects located at increasing distances from the coast to determine whether a non-random arboreal ant assemblage, such as an ant mosaic, exists in the rainforest on the Masoala Peninsula, Madagascar. In most tropical rainforests, very populous colonies of territorially dominant arboreal ant species defend absolute territories distributed in a mosaic pattern. Among the 29 ant species recorded, only nine had colonies large enough to be considered potentially territorially dominant; the remaining species had smaller colonies and were considered non-dominant. Nevertheless, the null-model analyses used to examine the spatial structure of their assemblages did not reveal the existence of an ant mosaic. Inland, up to 44% of the trees were devoid of dominant arboreal ants, something not reported in other studies. While two Crematogaster species were not associated with one another, Brachymyrmex cordemoyi was positively associated with Technomyrmex albipes, which is considered an invasive species-a non-indigenous species that has an adverse ecological effect on the habitats it invades. The latter two species and Crematogaster ranavalonae were mutually exclusive. On the other hand, all of the trees in the coastal transect and at least 4 km of coast were occupied by T. albipes, and were interconnected by columns of workers. Technomyrmex albipes workers collected from different trees did not attack each other during confrontation tests, indicating that this species has formed a supercolony along the coast. Yet interspecific aggressiveness did occur between T. albipes and Crematogaster ranavalonae, a native species which is likely territorially dominant based on our intraspecific confrontation tests. These results suggest that the Masoala rainforest is threatened by a potential invasion by T. albipes, and that the penetration of this species further inland might be facilitated by the low density of native, territorially dominant arboreal ants normally able to limit its progression. |
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Address |
[Dejean, Alain] CNRS, Unite Mixte Rech 8172, Kourou, France, Email: alain.dejean@wanadoo.fr |
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Corporate Author |
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Thesis |
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Publisher |
PUBLIC LIBRARY SCIENCE |
Place of Publication |
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Editor |
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Language |
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Summary Language |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1932-6203 |
ISBN |
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Medium |
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Expedition |
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Conference |
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Notes |
ISI:000274923700021 |
Approved |
no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
81 |
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Permanent link to this record |