| Records |
| Author |
Ziegler, C.; Dusenge, M.E.; Nyirambangutse, B.; Zibera, E.; Wallin, G.; Uddling, J. |
| Title |
Contrasting Dependencies of Photosynthetic Capacity on Leaf Nitrogen in Early- and Late-Successional Tropical Montane Tree Species |
Type |
Journal Article |
| Year |
2020 |
Publication |
Frontiers in Plant Science |
Abbreviated Journal |
Front. Plant Sci. |
| Volume |
11 |
Issue |
|
Pages |
500479 |
| Keywords |
allocation; early successional; late successional; nitrogen; photosynthesis; tropical montane forests |
| Abstract |
Differences in photosynthetic capacity among tree species and tree functional types are currently assumed to be largely driven by variation in leaf nutrient content, particularly nitrogen (N). However, recent studies indicate that leaf N content is often a poor predictor of variation in photosynthetic capacity in tropical trees. In this study, we explored the relative importance of area-based total leaf N content (Ntot) and within-leaf N allocation to photosynthetic capacity versus light-harvesting in controlling the variation in photosynthetic capacity (i.e. Vcmax, Jmax) among mature trees of 12 species belonging to either early (ES) or late successional (LS) groups growing in a tropical montane rainforest in Rwanda, Central Africa. Photosynthetic capacity at a common leaf temperature of 25˚C (i.e. maximum rates of Rubisco carboxylation, Vcmax25 and of electron transport, Jmax25) was higher in ES than in LS species (+ 58% and 68% for Vcmax25 and Jmax25, respectively). While Ntot did not significantly differ between successional groups, the photosynthetic dependency on Ntot was markedly different. In ES species, Vcmax25 was strongly and positively related to Ntot but this was not the case in LS species. However, there was no significant trade-off between relative leaf N investments in compounds maximizing photosynthetic capacity versus compounds maximizing light harvesting. Both leaf dark respiration at 25˚C (+ 33%) and, more surprisingly, apparent photosynthetic quantum yield (+ 35%) was higher in ES than in LS species. Moreover, Rd25 was positively related to Ntot for both ES and LS species. Our results imply that efforts to quantify carbon fluxes of tropical montane rainforests would be improved if they considered contrasting within-leaf N allocation and photosynthetic Ntot dependencies between species with different successional strategies. © Copyright © 2020 Ziegler, Dusenge, Nyirambangutse, Zibera, Wallin and Uddling. |
| Address |
Department of Biology, The University of Western Ontario, London, ON, Canada |
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Publisher  |
Frontiers Media S.A. |
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Edition |
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| ISSN |
1664462x (Issn) |
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no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
953 |
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| Author |
Herault, B.; Thoen, D. |
| Title |
How habitat area, local and regional factors shape plant assemblages in isolated closed depressions |
Type |
Journal Article |
| Year |
2009 |
Publication |
Acta Oecologica-International Journal of Ecology |
Abbreviated Journal |
Acta Oecol.-Int. J. Ecol. |
| Volume |
35 |
Issue |
3 |
Pages |
385-392 |
| Keywords |
Closed depressions; Colonization; Connectivity; Fragmented habitats; Emergent Groups; Open and forested landscape; Life-history traits |
| Abstract |
Classifying species by shared life-history traits is important if common ecological response groups are to be identified among different species. We investigated how habitat area, local and regional factors shape plant communities in small isolated closed depressions, and how the species richness is related to the interplay between environmental factors and specific life-history trait combinations. In Central-Western Europe, 169 closed depressions were completely Surveyed for plant presence in two highly contrasted landscapes (forested and open landscapes). All species were clustered into 9 Emergent Groups based oil 10 life-history traits related to plant dispersal, establishment and persistence. Habitat areas were related to species presence using logistic regressions. Most Emergent Groups were more area-dependent in open than in forested landscapes, owing to heterogeneous light levels in forest weakening the species-area relationship. In open landscapes, Floating Hydrophytes were severely underrepresented in very small depressions, owing to the absence of waterfowl poulation. Local environmental and regional factors were related to species richness using Generalized Linear Models. In open landscapes, local environmental factors such as water conductivity or soil productivity are respectively the main predictors. In forested landscapes, the abundance of most Emergent Groups Was better predicted by regional factors, i.e., habitat connectivity and distance to the forest edge. Forested landscapes strongly impeded the closed depressions' colonization by the less mobile Emergent Groups Such as Large-seeded Perennials. (C) 2009 Elsevier Masson SAS. All rights reserved. |
| Address |
[Herault, Bruno] Univ Antilles Guyane, UMR EcoFoG, F-97387 Kourou, France, Email: bruno.herault@ecofog.gf |
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| Publisher |
GAUTHIER-VILLARS/EDITIONS ELSEVIER |
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| ISSN |
1146-609X |
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| Notes |
ISI:000266174400006 |
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no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
112 |
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| Author |
Yatabe, Y.; Kane, N.C.; Scotti-Saintagne, C.; Rieseberg, L.H. |
| Title |
Rampant gene exchange across a strong reproductive barrier between the annual sunflowers, Helianthus annuus and H-petiolaris |
Type |
Journal Article |
| Year |
2007 |
Publication |
Genetics |
Abbreviated Journal |
Genetics |
| Volume |
175 |
Issue |
4 |
Pages |
1883-1893 |
| Keywords |
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| Abstract |
Plant species may remain morphologically distinct despite gene exchange with congeners, yet little is known about the genomewide pattern of introgression among species. Here we analyze the effects of persistent gene flow on genomic differentiation between the sympatric sunflower species Helianthus annuus and H. petiolaris. While the species are strongly isolated in testcrosses, genetic distances at 108 microsatellite loci and 14 sequenced genes are highly variable and much lower (on average) than for more closely related but historically allopatric congeners. Our analyses failed to detect a positive association between levels of genetic differentiation and chromosomal rearrangements (as reported in a prior publication) or proximity to QTL for morphological differences or hybrid sterility. However, a significant increase in differentiation was observed for markers within 5 cM of chromosomal breakpoints. Together, these results suggest that islands of differentiation between these two species are small, except in areas of low recombination. Furthermore, only microsatellites associated with ESTs were identified as outlier loci in tests for selection, which might indicate that the ESTs themselves are the targets of selection rather than linked genes (or that coding regions are not randomly distributed). In general, these results indicate that even strong and genetically complex reproductive barriers cannot prevent widespread introgression. |
| Address |
Indiana Univ, Dept Biol, Bloomington, IN 47405 USA, Email: lriesebe@indiana.edu |
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Thesis |
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| Publisher |
GENETICS |
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Edition |
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| ISSN |
0016-6731 |
ISBN |
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Conference |
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| Notes |
ISI:000246448800029 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
216 |
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| Author |
Scotti-Saintagne, C.; Mariette, S.; Porth, I.; Goicoechea, P.G.; Barreneche, T.; Bodenes, K.; Burg, K.; Kremer, A. |
| Title |
Genome scanning for interspecific differentiation between two closely related oak species [Quercus robur L. and Q petraea (Matt.) Liebl.] |
Type |
Journal Article |
| Year |
2004 |
Publication |
Genetics |
Abbreviated Journal |
Genetics |
| Volume |
168 |
Issue |
3 |
Pages |
1615-1626 |
| Keywords |
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| Abstract |
Interspecific differentiation values (G(ST)) between two closely related oak species (Quercus petraea and Q. robur) were compiled across different studies with the aim to explore the distribution of differentiation at the genome level. The study was based on a total set of 389 markers (isozymes, AFLPs, SCARs, microsatellites, and SNPs) for which allelic frequencies were estimated in pairs of populations sampled throughout the sympatric distribution of the two species. The overall distribution of GST values followed an L-shaped curve with most markers exhibiting low species differentiation (G(ST) < 0.01) and only a few loci reaching >10% levels. Twelve percent of the loci exhibited significant G(ST) deviations to neutral expectations, suggesting that selection contributed to species divergence. Coding regions expressed higher differentiation than noncoding regions. Among the 389 markers, 158 could be mapped on the 12 linkage groups of the existing Q. robur genetic map. Outlier loci with large G, values were distributed over 9 linkage groups. One cluster of three outlier loci was found within 0.51 cM; but significant autocorrelation of GST was observed at distances <2 cM. The size and distribution of genomic regions involved in species divergence are discussed in reference to hitchhiking effects and disruptive selection. |
| Address |
INRA, UMR Biodivers Genes & Ecosyst, F-33612 Cestas, France, Email: kremer@pierronton.inra.fr |
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| Publisher |
GENETICS |
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| ISSN |
0016-6731 |
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Conference |
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| Notes |
ISI:000225767400041 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
258 |
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| Author |
Almeras, T. |
| Title |
Mechanical analysis of the strains generated by water tension in plant stems. Part II: strains in wood and bark and apparent compliance |
Type |
Journal Article |
| Year |
2008 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
| Volume |
28 |
Issue |
10 |
Pages |
1513-1523 |
| Keywords |
biomechanics; calibration; diurnal strains; mechanical model; multilayer cylinder; water potential |
| Abstract |
Tree steins shrink in diameter during the day and swell during the night in response to changes in water tension in the xylem. Stein shrinkage can easily be measured in a nondestructive way, to derive continuous information about tree water status. The relationship between the strain and the change in water tension can be evaluated by empirical calibrations, or can be related to the structure of the plant. A mechanical analysis was performed to make this relationship explicit. The stem is modeled as a cylinder made of multiple layers of tissues, including heartwood, sapwood, and inner and outer bark. The effect of changes in water tension on the apparent strain at the surface of a tissue is quantified as a function of parameters defining stem anatomy and the mechanical properties of the tissues. Various possible applications in the context of tree physiology are suggested. |
| Address |
INRA UMR Ecofog, Kourou 97379, French Guiana, Email: t_almeras@hotmail.com |
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| Publisher |
HERON PUBLISHING |
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| ISSN |
0829-318X |
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| Notes |
ISI:000260027200009 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
129 |
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| Author |
Almeras, T.; Gril, J. |
| Title |
Mechanical analysis of the strains generated by water tension in plant stems. Part 1: stress transmission from the water to the cell walls |
Type |
Journal Article |
| Year |
2007 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
| Volume |
27 |
Issue |
11 |
Pages |
1505-1516 |
| Keywords |
biomechanics; cell mechanics; diurnal strains; mechanical model; multilayer cylinder; stress transtnissionjactor |
| Abstract |
Plant tissues shrink and swell in response to changes in water pressure. These strains can be easily measured, e.g., at the surface of tree stems, to obtain indirect information about plant water status and other physiological parameters. We developed a mechanical model to clarify how water pressure is transmitted to cell walls and causes shrinkage of plant tissues, particularly in the case of thick-walled cells such as wood fibers. Our analysis shows that the stress inside the fiber cell walls is lower than the water tension. The difference is accounted for by a stress transmission factor that depends on two main effects. The first effect is the dilution of the stress through the cell wall, because water acts at the lumen border and is transmitted to the cuter border of the cell, which has a larger circumference. The second effect is the partial conversion of radial stress into tangential stress. Both effects are quantified as functions of parameters of the cell wall structure and its mechanical properties. |
| Address |
INRA, UMR Ecofog, F-97379 Kourou, French Guiana, France, Email: t_almeras@hotmail.com |
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| Publisher |
HERON PUBLISHING |
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| ISSN |
0829-318X |
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| Notes |
ISI:000250847000001 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
152 |
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| Author |
Coste, S.; Roggy, J.C.; Imbert, P.; Born, C.; Bonal, D.; Dreyer, E. |
| Title |
Leaf photosynthetic traits of 14 tropical rain forest species in relation to leaf nitrogen concentration and shade tolerance |
Type |
Journal Article |
| Year |
2005 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
| Volume |
25 |
Issue |
9 |
Pages |
1127-1137 |
| Keywords |
functional diversity; leaf carbon; leaf nitrogen; nitrogen-use efficiency; photosynthetic capacity; tropical rain forest |
| Abstract |
Variability of leaf traits related to photosynthesis was assessed in seedlings from 14 tree species growing in the tropical rain forest of French Guiana. Leaf photosynthetic capacity (maximum rate of carboxylation and maximum rate of electron transport) was estimated by fitting a biochemical model of photosynthesis to response curves of net CO2 assimilation rate versus intercellular CO2 mole fraction. Leaf morphology described by leaf mass per unit leaf area (LMA), density and thickness, as well as area- and mass-based nitrogen (N) and carbon (C) concentrations, were recorded on the same leaves. Large interspecific variability was detected in photosynthetic capacity as well as in leaf structure and leaf N and C concentrations. No correlation was found between leaf thickness and density. The correlations between area- and mass-based leaf N concentration and photosynthetic capacity were poor. Conversely, the species differed greatly in relative N allocation to carboxylation and bioenergetics. Principal component analysis (PCA) revealed that, of the recorded traits, only the computed fraction of total leaf N invested in photosynthesis was tightly correlated to photosynthetic capacity. We also used PCA to test to what extent species with similar shade tolerances displayed converging leaf traits related to photosynthesis. No clear-cut ranking could be detected among the shade-tolerant groups, as confirmed by a one-way ANOVA. We conclude that the large interspecific diversity in photosynthetic capacity was mostly explained by differences in the relative allocation of N to photosynthesis and not by leaf N concentration, and that leaf traits related to photosynthetic capacity did not discriminate shade-tolerance ranking of these tropical tree species. |
| Address |
CNRS Ecol Forets Guyane, INRA, ENGREF,CIRAD, Unite Mixte Rech, Kourou 97387, French Guiana, Email: roggy.j@cirad.fr |
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| Publisher |
HERON PUBLISHING |
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0829-318X |
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| Notes |
ISI:000231555200005 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
230 |
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| Author |
Bosc, A.; De Grandcourt, A.; Loustau, D. |
| Title |
Variability of stem and branch maintenance respiration in a Pinus pinaster tree |
Type |
Journal Article |
| Year |
2003 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
| Volume |
23 |
Issue |
4 |
Pages |
227-236 |
| Keywords |
model; nitrogen; phloem; sapwood; temperature |
| Abstract |
The relationship between maintenance respiration (R.) of woody organs and their structural characteristics was explored in adult Pinus pinaster Ait. trees. We measured R-m on 75 stem and branch segments of different ages (from 3 to 24 years) and diameters (from 1 to 35 cm). The temperature response of R-m was derived from field measurements based on a classical exponential function with Q(10) = 2.13. Relationships between R-m and the dimensions of the woody organs were analyzed under controlled conditions in the laboratory. The surface area of a woody organ was a better predictor of R-m than volume, but surface area failed to account for the observed within-tree variability of R-m among stems, branches and twigs. Two simple models were proposed to predict the variability of R-m at 15 degreesC in an adult tree. Model 1, a linear function model based on the dry mass and nitrogen concentration of sapwood and phloem tissues, explained most of the variability of R-m in branches and stems (R-2 = 0.97). We concluded that the respective contributions of the phloem and sapwood depend on the location and diameter of the woody organ. Model 2, a power-law function model based on the length, diameter and age of the sample, explained the same variance of R-m as Model 1 and is appropriate for scaling R-m to the stand level. Models 1 and 2 appear to explain a larger variability of R-m than models based on stem area or sapwood mass. |
| Address |
INRA, F-33612 Cestas, France, Email: alexandre.bosc@pierroton.inra.fr |
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| Publisher |
HERON PUBLISHING |
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0829-318X |
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| Notes |
ISI:000181841200002 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
246 |
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| Author |
Cochard, H.; Coste, S.; Chanson, B.; Guehl, J.M.; Nicolini, E. |
| Title |
Hydraulic architecture correlates with bud organogenesis and primary shoot growth in beech (Fagus sylvatica) |
Type |
Journal Article |
| Year |
2005 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
| Volume |
25 |
Issue |
12 |
Pages |
1545-1552 |
| Keywords |
development; hydraulic conductance; leaf primordia; meristem; xylem |
| Abstract |
In beech (Fagus sylvatica L.), the number of leaf primordia preformed in the buds determines the length and the type (long versus short) of annual growth units, and thus, branch growth and architecture. We analyzed the correlation between the number of leaf primordia and the hydraulic conductance of the vascular system connected to the buds. Terminal buds of short growth units and axillary buds of long growth units on lower branches of mature trees were examined. Buds with less than four and more than five leaf primordia formed short and long growth units, respectively. Irrespective of the type of growth unit the bud was formed on, the occurrence of a large number of leaf primordia was associated with high xylem hydraulic conductance. Xylem conductance was correlated to the area of the outermost annual ring. These results suggest that organogenesis and primary growth in buds correlates with secondary growth of the growth units and thus with their hydraulic architecture. Possible causal relationships between the variables are discussed. |
| Address |
INRA UBP, UMR PIAF, F-63039 Clermont Ferrand, France, Email: cochard@clermont.inra.fr |
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| Publisher |
HERON PUBLISHING |
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0829-318X |
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| Notes |
ISI:000234019900008 |
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no |
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EcoFoG @ webmaster @ |
Serial |
281 |
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| Author |
Wagner, F.; Rossi, V.; Baraloto, C.; Bonal, D.; Stahl, C.; Herault, B. |
| Title |
Are commonly measured functional traits involved in tropical tree responses to climate? |
Type |
Journal Article |
| Year |
2014 |
Publication |
International Journal of Ecology |
Abbreviated Journal |
Int. J. Ecol. |
| Volume |
2014 |
Issue |
389409 |
Pages |
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| Abstract |
Climate models predict significant rainfall reduction in Amazonia, reducing water availability for trees. We present how functional traits modulate the tree growth response to climate. We used data from 3 years of bimestrial growth measurements for 204 trees of 53 species in the forest of Paracou, French Guiana. We integrated climate variables from an eddy covariance tower and functional trait values describing life history, leaf, and stem economics. Our results indicated that the measured functional traits are to some extent linked to the response of trees to climate but they are poor predictors of the tree climate-induced growth variation. Tree growth was affected by water availability for most of the species with different species growth strategies in drought conditions. These strategies were linked to some functional traits, especially maximum height and wood density. These results suggest that (i) trees seem adapted to the dry season at Paracou but they show different growth responses to drought, (ii) drought response is linked to growth strategy and is partly explained by functional traits, and (iii) the limited part of the variation of tree growth explained by functional traits may be a strong limiting factor for the prediction of tree growth response to climate. © 2014 Fabien Wagner et al. |
| Address |
CIRAD, UMR Systèmes d'Elevage en Milieux Méditerranéens et Tropicaux, 97379 Kourou, France |
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Hindawi Publishing Corporation |
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16879716 (Issn) |
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Export Date: 30 July 2014; Correspondence Address: Wagner, F.; Remote Sensing Division, National Institute for Space Research (INPE), 12227-010 São José dos Campos, SP, Brazil; email: wagner.h.fabien@gmail.com |
Approved |
no |
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EcoFoG @ webmaster @ |
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556 |
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