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Bonal, D.; Ponton, S.; Le Thiec, D.; Richard, B.; Ningre, N.; Herault, B.; Ogee, J.; Gonzalez, S.; Pignal, M.; Sabatier, D.; Guehl, J.M. |
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Title |
Leaf functional response to increasing atmospheric CO(2) concentrations over the last century in two northern Amazonian tree species: a historical delta(13)C and delta(18)O approach using herbarium samples |
Type |
Journal Article |
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Year |
2011 |
Publication |
Plant Cell and Environment |
Abbreviated Journal |
Plant Cell Environ. |
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Volume |
34 |
Issue |
8 |
Pages  |
1332-1344 |
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Keywords |
carbon isotope composition; environmental change; herbarium; oxygen isotope composition; photosynthesis; stomata; tropical rainforests |
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Abstract |
We assessed the extent of recent environmental changes on leaf morphological (stomatal density, stomatal surface, leaf mass per unit area) and physiological traits (carbon isotope composition, delta(13)C(leaf), and discrimination, Delta(13)C(leaf), oxygen isotope composition, delta(18)O(leaf)) of two tropical rainforest species (Dicorynia guianensis; Humiria balsamifera) that are abundant in the Guiana shield (Northern Amazonia). Leaf samples were collected in different international herbariums to cover a 200 year time-period (1790-2004) and the whole Guiana shield. Using models describing carbon and oxygen isotope fractionations during photosynthesis, different scenarios of change in intercellular CO(2) concentrations inside the leaf (C(i)), stomatal conductance (g), and photosynthesis (A) were tested in order to understand leaf physiological response to increasing air CO(2) concentrations (C(a)). Our results confirmed that both species displayed physiological response to changing C(a). For both species, we observed a decrease of about 1.7% in delta(13)C(leaf) since 1950, without significant change in Delta(13)C(leaf) and leaf morphological traits. Furthermore, there was no clear change in delta(18)O(leaf) for Humiria over this period. Our simulation approach revealed that an increase in A, rather than a decrease in g, explained the observed trends for these tropical rainforest species, allowing them to maintain a constant ratio of C(i)/C(a). |
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[Bonal, D] INRA, UMR Ecofog, F-97387 Kourou, France, Email: bonal@nancy.inra.fr |
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Wiley-Blackwell |
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0140-7791 |
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WOS:000292698900010 |
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EcoFoG @ webmaster @ |
Serial |
330 |
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Baraloto, C.; Paine, C.E.T.; Poorter, L.; Beauchene, J.; Bonal, D.; Domenach, A.M.; Herault, B.; Patino, S.; Roggy, J.C.; Chave, J. |
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Title |
Decoupled leaf and stem economics in rain forest trees |
Type |
Journal Article |
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Year |
2010 |
Publication |
Ecology Letters |
Abbreviated Journal |
Ecol. Lett. |
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Volume |
13 |
Issue |
11 |
Pages |
1338-1347 |
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Keywords |
Functional diversity; leaf economics; multiple factor analysis; plant strategies; plant traits; tropical forest; wood density |
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Abstract |
P>Cross-species analyses of plant functional traits have shed light on factors contributing to differences in performance and distribution, but to date most studies have focused on either leaves or stems. We extend these tissue-specific analyses of functional strategy towards a whole-plant approach by integrating data on functional traits for 13 448 leaves and wood tissues from 4672 trees representing 668 species of Neotropical trees. Strong correlations amongst traits previously defined as the leaf economics spectrum reflect a tradeoff between investments in productive leaves with rapid turnover vs. costly physical leaf structure with a long revenue stream. A second axis of variation, the 'stem economics spectrum', defines a similar tradeoff at the stem level: dense wood vs. high wood water content and thick bark. Most importantly, these two axes are orthogonal, suggesting that tradeoffs operate independently at the leaf and at the stem levels. By simplifying the multivariate ecological strategies of tropical trees into positions along these two spectra, our results provide a basis to improve global vegetation models predicting responses of tropical forests to global change. |
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[Baraloto, Christopher; Bonal, Damien; Patino, Sandra; Roggy, Jean-Christophe] INRA, UMR Ecol Forets Guyane, Kourou 97387, French Guiana, Email: chris.baraloto@ecofog.gf |
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WILEY-BLACKWELL PUBLISHING, INC |
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1461-023X |
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ISI:000283157500002 |
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EcoFoG @ eric.marcon @ |
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26 |
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Aili, S.R.; Touchard, A.; Petitclerc, F.; Dejean, A.; Orivel, J.; Padula, M.P.; Escoubas, P.; Nicholson, G.M. |
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Title |
Combined Peptidomic and Proteomic Analysis of Electrically Stimulated and Manually Dissected Venom from the South American Bullet Ant Paraponera clavata |
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Journal Article |
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Year |
2017 |
Publication |
Journal of Proteome Research |
Abbreviated Journal |
J. Proteome Res. |
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Volume |
16 |
Issue |
3 |
Pages |
1339-1351 |
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Abstract |
Ants have evolved venoms rich in peptides and proteins used for predation, defense, and communication. However, they remain extremely understudied due to the minimal amount of venom secreted by each ant. The present study investigated the differences in the proteome and peptidome of the venom from the bullet ant, Paraponera clavata. Venom samples were collected from a single colony either by manual venom gland dissection or by electrical stimulation and were compared using proteomic methods. Venom proteins were separated by 2D-PAGE and identified by nanoLC-ESI-QTOF MS/MS. Venom peptides were initially separated using C18 reversed-phase high-performance liquid chromatography, then analyzed by MALDI-TOF MS. The proteomic analysis revealed numerous proteins that could be assigned a biological function (total 94), mainly as toxins, or roles in cell regulation and transport. This investigation found that ca. 73% of the proteins were common to venoms collected by the two methods. The peptidomic analysis revealed a large number of peptides (total 309) but with <20% shared by the two collection methods. There was also a marked difference between venoms obtained by venom gland dissection from different ant colonies. These findings demonstrate the rich composition and variability of P. clavata venom. |
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American Chemical Society |
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1535-3893 |
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EcoFoG @ webmaster @ |
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746 |
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Author |
Strasburg, J.L.; Scotti-Saintagne, C.; Scotti, I.; Lai, Z.; Rieseberg, L.H. |
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Title |
Genomic Patterns of Adaptive Divergence between Chromosomally Differentiated Sunflower Species |
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Journal Article |
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Year |
2009 |
Publication |
Molecular Biology and Evolution |
Abbreviated Journal |
Mol. Biol. Evol. |
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Volume |
26 |
Issue |
6 |
Pages |
1341-1355 |
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Keywords |
species boundaries; chromosomal rearrangements; positive selection; hybridization; sunflowers; Helianthus |
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Abstract |
Understanding the genetic mechanisms of speciation and basis of species differences is among the most important challenges in evolutionary biology. Two questions of particular interest are what roles divergent selection and chromosomal differentiation play in these processes. A number of recently proposed theories argue that chromosomal rearrangements can facilitate the development and maintenance of reproductive isolation and species differences by suppressing recombination within rearranged regions. Reduced recombination permits the accumulation of alleles contributing to isolation and adaptive differentiation and protects existing differences from the homogenizing effects of introgression between incipient species. Here, we examine patterns of genetic diversity and divergence in rearranged versus collinear regions in two widespread, extensively hybridizing sunflower species, Helianthus annuus and Helianthus petiolaris, using sequence data from 77 loci distributed throughout the genomes of the two species. We find weak evidence for increased genetic divergence near chromosomal break points but not within rearranged regions overall. We find no evidence for increased rates of adaptive divergence on rearranged chromosomes; in fact, collinear chromosomes show a far greater excess of fixed amino acid differences between the two species. A comparison with a third sunflower species indicates that much of the nonsynonymous divergence between H. annuus and H. petiolaris probably occurred during or soon after their formation. Our results suggest a limited role for chromosomal rearrangements in genetic divergence, but they do document substantial adaptive divergence and provide further evidence of how species integrity and genetic identity can be maintained at many loci in the face of extensive hybridization and gene flow. |
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[Strasburg, Jared L.; Scotti-Saintagne, Caroline; Rieseberg, Loren H.] Indiana Univ, Dept Biol, Bloomington, IN 47405 USA, Email: jstrasbu@indiana.edu |
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OXFORD UNIV PRESS |
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0737-4038 |
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ISI:000266116500012 |
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EcoFoG @ eric.marcon @ |
Serial |
111 |
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Phillips, O.L.; Aragao, L.E.O.C.; Lewis, S.L.; Fisher, J.B.; Lloyd, J.; Lopez-Gonzalez, G.; Malhi, Y.; Monteagudo, A.; Peacock, J.; Quesada, C.A.; van der Heijden, G.; Almeida, S.; Amaral, I.; Arroyo, L.; Aymard, G.; Baker, T.R.; Banki, O.; Blanc, L.; Bonal, D.; Brando, P.; Chave, J.; de Oliveira, A.C.A.; Cardozo, N.D.; Czimczik, C.I.; Feldpausch, T.R.; Freitas, M.A.; Gloor, E.; Higuchi, N.; Jimenez, E.; Lloyd, G.; Meir, P.; Mendoza, C.; Morel, A.; Neill, D.A.; Nepstad, D.; Patino, S.; Penuela, M.C.; Prieto, A.; Ramirez, F.; Schwarz, M.; Silva, J.; Silveira, M.; Thomas, A.S.; ter Steege, H.; Stropp, J.; Vasquez, R.; Zelazowski, P.; Davila, E.A.; Andelman, S.; Andrade, A.; Chao, K.J.; Erwin, T.; Di Fiore, A.; Honorio, E.; Keeling, H.; Killeen, T.J.; Laurance, W.F.; Cruz, A.P.; Pitman, N.C.A.; Vargas, P.N.; Ramirez-Angulo, H.; Rudas, A.; Salamao, R.; Silva, N.; Terborgh, J.; Torres-Lezama, A. |
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Title |
Drought Sensitivity of the Amazon Rainforest |
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Journal Article |
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Year |
2009 |
Publication |
Science |
Abbreviated Journal |
Science |
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Volume |
323 |
Issue |
5919 |
Pages |
1344-1347 |
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Abstract |
Amazon forests are a key but poorly understood component of the global carbon cycle. If, as anticipated, they dry this century, they might accelerate climate change through carbon losses and changed surface energy balances. We used records from multiple long-term monitoring plots across Amazonia to assess forest responses to the intense 2005 drought, a possible analog of future events. Affected forest lost biomass, reversing a large long-term carbon sink, with the greatest impacts observed where the dry season was unusually intense. Relative to pre-2005 conditions, forest subjected to a 100-millimeter increase in water deficit lost 5.3 megagrams of aboveground biomass of carbon per hectare. The drought had a total biomass carbon impact of 1.2 to 1.6 petagrams (1.2 x 10(15) to 1.6 x 10(15) grams). Amazon forests therefore appear vulnerable to increasing moisture stress, with the potential for large carbon losses to exert feedback on climate change. |
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[Phillips, Oliver L.; Lewis, Simon L.; Lloyd, Jon; Lopez-Gonzalez, Gabriela; Peacock, Julie; Quesada, Carlos A.; van der Heijden, Geertje; Baker, Tim R.; Feldpausch, Ted R.; Gloor, Emanuel; Patino, Sandra; Schwarz, Michael; Chao, Kuo-Jung; Keeling, Helen] Univ Leeds, Sch Geog, Leeds LS2 9JT, W Yorkshire, England, Email: o.phillips@leeds.ac.uk |
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AMER ASSOC ADVANCEMENT SCIENCE |
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0036-8075 |
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ISI:000263876700042 |
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EcoFoG @ eric.marcon @ |
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120 |
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Rahali, H.; Ghanem, N.; Griffe, L.; Rahali, R.; Stien, D. |
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Title |
A general approach to the quantification of resin-bound functional groups by NMR |
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Journal Article |
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Year |
2004 |
Publication |
New Journal of Chemistry |
Abbreviated Journal |
New J. Chem. |
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Volume |
28 |
Issue |
11 |
Pages |
1344-1346 |
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There has been a continuing need for sensitive, accurate and rapid methods to monitor functional loading of insoluble supports for solid phase synthesis. The present articles reports our findings regarding functional group loading quantification using H-1 NMR. Results obtained for supported amino, hydroxyl and NH-Fmoc groups are in agreement with those calculated using well-established methods and demonstrate that the strategy of looking, either at the excess reagent left in solution (NH2 and OH), or at the protecting group derivatives released from the polymer (Fmoc), is a viable approach to resin loading quanti. cation. |
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Univ Montpellier 2, CNRS, UMR 5810, Lab Aminoacides Peptides & Prot, F-34095 Montpellier 05, France, Email: didier.stien@guyane.cnrs.fr |
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ROYAL SOC CHEMISTRY |
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1144-0546 |
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ISI:000224894700013 |
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EcoFoG @ eric.marcon @ |
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261 |
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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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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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SPRINGER |
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0098-0331 |
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ISI:000273086100009 |
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EcoFoG @ eric.marcon @ |
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73 |
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Clair, B.; Fournier, M.; Prevost, M.F.; Beauchene, J.; Bardet, S. |
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Title |
Biomechanics of buttressed trees: Bending strains and stresses |
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Journal Article |
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Year |
2003 |
Publication |
American Journal of Botany |
Abbreviated Journal |
Am. J. Bot. |
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Volume |
90 |
Issue |
9 |
Pages |
1349-1356 |
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Keywords |
biomechanics; buttress; Eleaocarpaceae; French Guiana; Sloanea spp.; tropical trees; wood |
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The different hypotheses about buttress function and formation mainly involve mechanical theory. Forces were applied to two trees of Sloanea spp.. a tropical genus that develops typical thin buttresses. and the three-dimensional strains were measured at different parts of the trunk base. Risks of failure were greater on the buttress sides, where shear and tangential stresses are greater, not on the ridges. in spite of high longitudinal (parallel to the grain) stresses. A simple beam model, computed from the second moment of area of digitized cross sections, is consistent with longitudinal strain variations but cannot predict accurately variations with height. Patterns of longitudinal strain variation along ridges are very different in the two individuals, owing to a pronounced lateral curvature in one specimen. The constant stress hypothesis is discussed based on these results. Without chronological data during the development of the tree. it cannot be proved that buttress formation is activated by stress or strain. |
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CIRAD ENGREF INRA, UMR Ecol Forets Guyane, F-97310 Kourou, Guyane Francais, France |
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BOTANICAL SOC AMER INC |
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0002-9122 |
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ISI:000185459000010 |
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EcoFoG @ eric.marcon @ |
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244 |
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Roussel, J.-R.; Clair, B. |
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Evidence of the late lignification of the G-layer in Simarouba tension wood, to assist understanding how non-G-layer species produce tensile stress |
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Journal Article |
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Year |
2015 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiology |
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Volume |
35 |
Issue |
12 |
Pages |
1366-1377 |
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Keywords |
maturation stress generation; ontogeny; Simarouba amara Aubl.; tension wood cell wall; tree biomechanics |
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To recover verticality after disturbance, angiosperm trees produce 'tension wood' allowing them to bend actively. The driving force of the tension has been shown to take place in the G-layer, a specific unlignified layer of the cell wall observed in most temperate species. However, in tropical rain forests, the G-layer is often absent and the mechanism generating the forces to reorient trees remains unclear. A study was carried out on tilted seedlings, saplings and adult Simarouba amara Aubl. trees – a species known to not produce a G-layer. Microscopic observations were done on sections of normal and tension wood after staining or observed under UV light to assess the presence/absence of lignin. We showed that S. amara produces a cell-wall layer with all of the characteristics typical of G-layers, but that this G-layer can be observed only as a temporary stage of the cell-wall development because it is masked by a late lignification. Being thin and lignified, tension wood fibres cannot be distinguished from normal wood fibres in the mature wood of adult trees. These observations indicate that the mechanism generating the high tensile stress in tension wood is likely to be the same as that in species with a typical G-layer and also in species where the G-layer cannot be observed in mature cells. © 2015 The Author 2015. Published by Oxford University Press. All rights reserved. |
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CNRS, UMR Ecologie des Forêts de Guyane (EcoFoG), Campus Agronomique, BP 701, Kourou, France |
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Export Date: 25 March 2016 |
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EcoFoG @ webmaster @ |
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672 |
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Author |
Bastin, J.-F.; Rutishauser, E.; Kellner, J.R.; Saatchi, S.; Pélissier, R.; Hérault, B.; Slik, F.; Bogaert, J.; De Cannière, C.; Marshall, A.R.; Poulsen, J.; Alvarez-Loyayza, P.; Andrade, A.; Angbonga-Basia, A.; Araujo-Murakami, A.; Arroyo, L.; Ayyappan, N.; de Azevedo, C.P.; Banki, O.; Barbier, N.; Barroso, J.G.; Beeckman, H.; Bitariho, R.; Boeckx, P.; Boehning-Gaese, K.; Brandão, H.; Brearley, F.Q.; Breuer Ndoundou Hockemba, M.; Brienen, R.; Camargo, J.L.C.; Campos-Arceiz, A.; Cassart, B.; Chave, J.; Chazdon, R.; Chuyong, G.; Clark, D.B.; Clark, C.J.; Condit, R.; Honorio Coronado, E.N.; Davidar, P.; de Haulleville, T.; Descroix, L.; Doucet, J.-L.; Dourdain, A.; Droissart, V.; Duncan, T.; Silva Espejo, J.; Espinosa, S.; Farwig, N.; Fayolle, A.; Feldpausch, T.R.; Ferraz, A.; Fletcher, C.; Gajapersad, K.; Gillet, J.-F.; Amaral, I.L. do; Gonmadje, C.; Grogan, J.; Harris, D.; Herzog, S.K.; Homeier, J.; Hubau, W.; Hubbell, S.P.; Hufkens, K.; Hurtado, J.; Kamdem, N.G.; Kearsley, E.; Kenfack, D.; Kessler, M.; Labrière, N.; Laumonier, Y.; Laurance, S.; Laurance, W.F.; Lewis, S.L.; Libalah, M.B.; Ligot, G.; Lloyd, J.; Lovejoy, T.E.; Malhi, Y.; Marimon, B.S.; Marimon Junior, B.H.; Martin, E.H.; Matius, P.; Meyer, V.; Mendoza Bautista, C.; Monteagudo-Mendoza, A.; Mtui, A.; Neill, D.; Parada Gutierrez, G.A.; Pardo, G.; Parren, M.; Parthasarathy, N.; Phillips, O.L.; Pitman, N.C.A.; Ploton, P.; Ponette, Q.; Ramesh, B.R.; Razafimahaimodison, J.-C.; Réjou-Méchain, M.; Rolim, S.G.; Saltos, H.R.; Rossi, L.M.B.; Spironello, W.R.; Rovero, F.; Saner, P.; Sasaki, D.; Schulze, M.; Silveira, M.; Singh, J.; Sist, P.; Sonke, B.; Soto, J.D.; de Souza, C.R.; Stropp, J.; Sullivan, M.J.P.; Swanepoel, B.; Steege, H. ter; Terborgh, J.; Texier, N.; Toma, T.; Valencia, R.; Valenzuela, L.; Ferreira, L.V.; Valverde, F.C.; Van Andel, T.R.; Vasque, R.; Verbeeck, H.; Vivek, P.; Vleminckx, J.; Vos, V.A.; Wagner, F.H.; Warsudi, P.P.; Wortel, V.; Zagt, R.J.; Zebaze, D. |
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Title |
Pan-tropical prediction of forest structure from the largest trees |
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Journal Article |
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Year |
2018 |
Publication |
Global Ecology and Biogeography |
Abbreviated Journal |
Global Ecol Biogeogr |
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Volume |
27 |
Issue |
11 |
Pages |
1366-1383 |
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Keywords |
carbon; climate change; forest structure; large trees; pan-tropical; Redd+; tropical forest ecology |
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Abstract |
Abstract Aim Large tropical trees form the interface between ground and airborne observations, offering a unique opportunity to capture forest properties remotely and to investigate their variations on broad scales. However, despite rapid development of metrics to characterize the forest canopy from remotely sensed data, a gap remains between aerial and field inventories. To close this gap, we propose a new pan-tropical model to predict plot-level forest structure properties and biomass from only the largest trees. Location Pan-tropical. Time period Early 21st century. Major taxa studied Woody plants. Methods Using a dataset of 867 plots distributed among 118 sites across the tropics, we tested the prediction of the quadratic mean diameter, basal area, Lorey's height, community wood density and aboveground biomass (AGB) from the ith largest trees. Results Measuring the largest trees in tropical forests enables unbiased predictions of plot- and site-level forest structure. The 20 largest trees per hectare predicted quadratic mean diameter, basal area, Lorey's height, community wood density and AGB with 12, 16, 4, 4 and 17.7% of relative error, respectively. Most of the remaining error in biomass prediction is driven by differences in the proportion of total biomass held in medium-sized trees (50?70 cm diameter at breast height), which shows some continental dependency, with American tropical forests presenting the highest proportion of total biomass in these intermediate-diameter classes relative to other continents. Main conclusions Our approach provides new information on tropical forest structure and can be used to generate accurate field estimates of tropical forest carbon stocks to support the calibration and validation of current and forthcoming space missions. It will reduce the cost of field inventories and contribute to scientific understanding of tropical forest ecosystems and response to climate change. |
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John Wiley & Sons, Ltd (10.1111) |
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1466-822x |
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Notes |
doi: 10.1111/geb.12803 |
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EcoFoG @ webmaster @ |
Serial |
845 |
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