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Soudani, K.; Hmimina, G.; Delpierre, N.; Pontailler, J.-Y.; Aubinet, M.; Bonal, D.; Caquet, B.; de Grandcourt, A.; Burban, B.; Flechard, C.; Guyon, D.; Granier, A.; Gross, P.; Heinesh, B.; Longdoz, B.; Loustau, D.; Moureaux, C.; Ourcival, J.-M.; Rambal, S.; Saint André, L.; Dufrêne, E. |
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Title |
Ground-based Network of NDVI measurements for tracking temporal dynamics of canopy structure and vegetation phenology in different biomes |
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Journal Article |
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2012 |
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Remote Sensing of Environment |
Abbreviated Journal |
Remote Sens. Environ. |
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123 |
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234-245 |
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Crops; Evergreen and deciduous forests; Ground-based NDVI; Herbaceous savanna; NDVI time-series; Phenology; Tropical rain forest |
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Plant phenology characterises the seasonal cyclicity of biological events such as budburst, flowering, fructification, leaf senescence and leaf fall. These biological events are genetically pre-determined but also strongly modulated by climatic conditions, particularly temperature, daylength and water availability. Therefore, the timing of these events is considered as a good indicator of climate change impacts and as a key parameter for understanding and modelling vegetation-climate interactions. In situ observations, empirical or bioclimatic models and remotely sensed time-series data constitute the three possible ways for monitoring the timing of plant phenological events. Remote sensing has the advantage of being the only way of surface sampling at high temporal frequency and, in the case of satellite-based remote sensing, over large regions. Nevertheless, exogenous factors, particularly atmospheric conditions, lead to some uncertainties on the seasonal course of surface reflectance and cause bias in the identification of vegetation phenological events. Since 2005, a network of forest and herbaceous sites has been equipped with laboratory made NDVI sensors to monitor the temporal dynamics of canopy structure and phenology at an intra-daily time step. In this study, we present recent results obtained in several contrasting biomes in France, French Guiana, Belgium and Congo. These sites represent a gradient of vegetation ecosystems: the main evergreen and deciduous forest ecosystems in temperate climate region, an evergreen tropical rain forest in French Guiana, an herbaceous savanna ecosystem in Congo, and a succession of three annual crops in Belgium. In this paper, (1) we provide an accurate description of the seasonal dynamics of vegetation cover in these different ecosystems (2) we identify the most relevant remotely sensed markers from NDVI time-series for determining the dates of the main phenological events that characterize these ecosystems and (3) we discuss the relationships between temporal canopy dynamics and climate factors. In addition to its importance for phenological studies, this ground-based Network of NDVI measurement provides data needed for the calibration and direct validation of satellite observations and products. © 2012 Elsevier Inc. |
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INRA, Unité Biogéochimie des Ecosystèmes Forestiers, Champenoux, France |
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00344257 (Issn) |
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Export Date: 16 August 2012; Source: Scopus; Coden: Rseea; doi: 10.1016/j.rse.2012.03.012; Language of Original Document: English; Correspondence Address: Soudani, K.; University of Paris-Sud, CNRS, AgroParisTech, Laboratoire Ecologie Systematique et Evolution, Faculty of Sciences of OrsayFrance; email: kamel.soudani@u-psud.fr |
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EcoFoG @ webmaster @ |
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422 |
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Ciminera, M.; Auger-Rozenberg, M.-A.; Caron, H.; Herrera, M.; Scotti-Saintagne, C.; Scotti, I.; Tysklind, N.; Roques, A. |
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Title |
Genetic Variation and Differentiation of Hylesia metabus (Lepidoptera: Saturniidae): Moths of Public Health Importance in French Guiana and in Venezuela |
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Journal Article |
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Year |
2019 |
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Journal of medical entomology |
Abbreviated Journal |
J. Med. Entomol. |
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56 |
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1 |
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137-148 |
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Hylesia moths impact human health in South America, inducing epidemic outbreaks of lepidopterism, a puriginous dermatitis caused by the urticating properties of females' abdominal setae. The classification of the Hylesia genus is complex, owing to its high diversity in Amazonia, high intraspecific morphological variance, and lack of interspecific diagnostic traits which may hide cryptic species. Outbreaks of Hylesia metabus have been considered responsible for the intense outbreaks of lepidopterism in Venezuela and French Guiana since the C20, however, little is known about genetic variability throughout the species range, which is instrumental for establishing control strategies on H. metabus. Seven microsatellites and mitochondrial gene markers were analyzed from Hylesia moths collected from two major lepidopterism outbreak South American regions. The mitochondrial gene sequences contained significant genetic variation, revealing a single, widespread, polymorphic species with distinct clusters, possibly corresponding to populations evolving in isolation. The microsatellite markers validated the mitochondrial results, and suggest the presence of three populations: one in Venezuela, and two in French Guiana. All moths sampled during outbreak events in French Guiana were assigned to a single coastal population. The causes and implications of this finding require further research. |
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INRA, Unité de Recherche Ecologie des forêts méditerranéennes, Avignon, UR629, France |
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NLM (Medline) |
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19382928 (Issn) |
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Export Date: 1 February 2019 |
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EcoFoG @ webmaster @ |
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857 |
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Sierra, J.; Daudin, D.; Domenach, A.M.; Nygren, P.; Desfontaines, L. |
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Nitrogen transfer from a legume tree to the associated grass estimated by the isotopic signature of tree root exudates: A comparison of the N-15 leaf feeding and natural N-15 abundance methods |
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Journal Article |
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Year |
2007 |
Publication |
European Journal of Agronomy |
Abbreviated Journal |
Eur. J. Agron. |
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27 |
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2-4 |
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178-186 |
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agroforestry; box model; gliricidia sepium; N-15 fractionation; root turnover; tree pruning |
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Nitrogen (N) transfer from legume trees to associated crops is a key factor for the N economy of low-input agroforestry systems. In this work, we presented a new approach to estimate N transfer based on the N-15 content of root exudates and N released by root turnover of the donor plant (Gliricidia sepium) and the temporal change of the N-15 content of the receiver plant (Dichanthium aristatum). The study was carried out in greenhouse using two isotopic methods: N-15 leaf feeding (LF) and the natural N-15 abundance (NA). Measurements of exudate N-15 were made at several dates before and after tree pruning. A time-dependent box model was devised to quantify N transfer in time and to make comparisons between the isotopic methods. In NA, although tree roots and exudates presented a similar N-15 signature before tree pruning, exudates were strongly depleted in N-15 after pruning. In LF, exudates were always depleted in N-15 in relation to tree roots. Hence, the current assumption used in N transfer studies concerning the equal N-15/N-14 distribution in tissues of the donor plant and in its excreted N was not confirmed in our study. Before pruning, N transfer functioned as a two-N-source system (soil N and exudates N) and both isotopic methods provided similar estimates: 11-12% for LF and 10-15% for NA. Calculations per-formed with the model indicated that N transfer occurred with small or nil fractionation of N-15 in exudates. After pruning, there was a third N source associated with N released from tree root turnover. During this period, the isotopic signature of the receiver plant showed a transient state due to the progressive decrease of N-15 content of that N source. The amount of N derived from the tree represented 65% of the total N content of the. grass at the end of the experiments. (c) 2007 Elsevier B.V. All rights reserved. |
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INRA, Unite Agropedioclimat, UR135, Petit Bourg 97170, Guadeloupe, Email: jorge.sierra@antilles.inra.fr |
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ELSEVIER SCIENCE BV |
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1161-0301 |
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ISI:000249798900003 |
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EcoFoG @ eric.marcon @ |
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157 |
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Scotti, I. |
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Adaptive potential in forest tree populations: what is it, and how can we measure it? |
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2010 |
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Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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67 |
Issue |
8 |
Pages |
801 |
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INRA, Unite Mixte Rech Ecol Forets Guyane EcoFoG, F-97387 Kourou, France, Email: ivan.scotti@ecofog.gf |
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EDP SCIENCES S A |
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1286-4560 |
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ISI:000283594400002 |
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EcoFoG @ eric.marcon @ |
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21 |
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Hibert, F.; Sabatier, D.; Andrivot, J.; Scotti-Saintagne, C.; Gonzalez, S.; Prévost, M.-F.; Grenand, P.; Chave, J.; Caron, H.; Richard-Hansen, C. |
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Botany, genetics and ethnobotany: A crossed investigation on the elusive tapir's diet in French guiana |
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Journal Article |
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2011 |
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PLoS One |
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PLoS ONE |
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6 |
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10 |
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e25850 |
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While the populations of large herbivores are being depleted in many tropical rainforests, the importance of their trophic role in the ecological functioning and biodiversity of these ecosystems is still not well evaluated. This is due to the outstanding plant diversity that they feed upon and the inherent difficulties involved in observing their elusive behaviour. Classically, the diet of elusive tropical herbivores is studied through the observation of browsing signs and macroscopic analysis of faeces or stomach contents. In this study, we illustrate that the original coupling of classic methods with genetic and ethnobotanical approaches yields information both about the diet diversity, the foraging modalities and the potential impact on vegetation of the largest terrestrial mammal of Amazonia, the lowland tapir. The study was conducted in the Guianan shield, where the ecology of tapirs has been less investigated. We identified 92 new species, 51 new genera and 13 new families of plants eaten by tapirs. We discuss the relative contribution of our different approaches, notably the contribution of genetic barcoding, used for the first time to investigate the diet of a large tropical mammal, and how local traditional ecological knowledge is accredited and valuable for research on the ecology of elusive animals. © 2011 Hibert et al. |
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INRA, Université de Bordeaux, UMR1202 BIOGECO, Cestas, France |
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19326203 (Issn) |
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Export Date: 21 October 2011; Source: Scopus; Art. No.: e25850; doi: 10.1371/journal.pone.0025850; Language of Original Document: English; Correspondence Address: Hibert, F.; Direction Etudes et Recherches Guyane, Office National de la Chasse et de la Faune Sauvage, Kourou, French Guiana, France; email: fabricenz@gmail.com |
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EcoFoG @ webmaster @ |
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343 |
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Abedini, R.; Clair, B.; Pourtahmasi, K.; Laurans, F.; Arnould, O. |
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Title |
Cell wall thickening in developing tension wood of artificially bent poplar trees |
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Journal Article |
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2015 |
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IAWA Journal |
Abbreviated Journal |
IAWA Journal |
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36 |
Issue |
1 |
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44-57 |
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developing xylem; Gelatinous layer; maturation stress; secondary wall layer; tree biomechanics |
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Trees can control their shape and resist gravity thanks to their ability to produce wood under tensile stress. This stress is known to be produced during the maturation of wood fibres but the mechanism of its generation remains unclear. This study focuses on the formation of the secondary wall in tension wood produced in artificially tilted poplar saplings. Thickness of secondary wall layer (SL) and gelatinous layer (GL) were measured from cambium to mature wood in several trees sampled at different times after tilting. Measurements on wood fibres produced before tilting show the progressive increase of secondary wall thickness during the growing season. After the tilting date, SL thickness decreased markedly from normal wood to tension wood while the total thickness increased compared to normal wood, with the development of a thick GL. However, even after GL formation, SL thickness continues to increase during the growing season. GL thickening was observed to be faster than SL thickening. The development of the unlignified GL is proposed to be a low cost, efficient strategy for a fast generation of tensile stress in broadleaved trees. © 2015 International Association of Wood Anatomists. |
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INRA, UR588 Amélioration, Génétique et Physiologie ForestièresOrléans, France |
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Export Date: 17 April 2015 |
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EcoFoG @ webmaster @ |
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596 |
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Caron, H.; Molino, J.-F.; Sabatier, D.; Léger, P.; Chaumeil, P.; Scotti-Saintagne, C.; Frigério, J.-M.; Scotti, I.; Franc, A.; Petit, R.J. |
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Title |
Chloroplast DNA variation in a hyperdiverse tropical tree community |
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Journal Article |
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2019 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
Ecology and Evolution |
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9 |
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8 |
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4897-4905 |
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chloroplast DNA; DNA barcoding; genetic diversity; hybridization; incomplete lineage sorting; introgression; species diversity; tropical trees |
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We investigate chloroplast DNA variation in a hyperdiverse community of tropical rainforest trees in French Guiana, focusing on patterns of intraspecific and interspecific variation. We test whether a species genetic diversity is higher when it has congeners in the community with which it can exchange genes and if shared haplotypes are more frequent in genetically diverse species, as expected in the presence of introgression. We sampled a total of 1,681 individual trees from 472 species corresponding to 198 genera and sequenced them at a noncoding chloroplast DNA fragment. Polymorphism was more frequent in species that have congeneric species in the study site than in those without congeners (30% vs. 12%). Moreover, more chloroplast haplotypes were shared with congeners in polymorphic species than in monomorphic ones (44% vs. 28%). Despite large heterogeneities caused by genus-specific behaviors in patterns of hybridization, these results suggest that the higher polymorphism in the presence of congeners is caused by local introgression rather than by incomplete lineage sorting. Our findings suggest that introgression has the potential to drive intraspecific genetic diversity in species-rich tropical forests. |
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INRA, UR629 Ecologie des Forêts Méditerranéennes, URFM, Avignon, France |
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John Wiley and Sons Ltd |
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20457758 (Issn) |
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EcoFoG @ webmaster @ |
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870 |
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Lefèvre, F.; Boivin, T.; Bontemps, A.; Courbet, F.; Davi, H.; Durand-Gillmann, M.; Fady, B.; Gauzere, J.; Gidoin, C.; Karam, M.-J.; Pichot, C.; Oddou-Muratorio, S.; Pichot, C. |
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Considering evolutionary processes in adaptive forestry |
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Journal Article |
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2013 |
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Annals of Forest Science |
Abbreviated Journal |
Ann For Sci |
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71 |
Issue |
7 |
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723-739 |
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Adaptation; Climate change; Evolution-oriented forest management; Genetic resources; Silviculture |
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Context: Managing forests under climate change requires adaptation. The adaptive capacity of forest tree populations is huge but not limitless. Integrating evolutionary considerations into adaptive forestry practice will enhance the capacity of managed forests to respond to climate-driven changes.
Aims: Focusing on natural regeneration systems, we propose a general framework that can be used in various and complex local situations by forest managers, in combination with their own expertise, to integrate evolutionary considerations into decision making for the emergence of an evolution-oriented forestry.
Methods: We develop a simple process-based analytical grid, using few processes and parameters, to analyse the impact of forestry practice on the evolution and evolvability of tree populations.
Results: We review qualitative and, whenever possible, quantitative expectations on the intensity of evolutionary drivers in forest trees. Then, we review the effects of actual and potential forestry practice on the evolutionary processes. We illustrate the complexity of interactions in two study cases: the evolutionary consequences for forest trees of biotic interactions and of highly heterogeneous environment.
Conclusion: Evolution-oriented forestry may contribute adapting forests to climate change. It requires combining short-term and long-term objectives. We propose future lines of research and experimentation. |
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INRA, UR629 Ecologie des Forêts Méditerranéennes, URFM, Domaine Saint Paul, Site AgroparcAvignon Cedex 9, France |
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Cited By :2; Export Date: 13 January 2015 |
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EcoFoG @ webmaster @ |
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580 |
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Leclerc, T.; Vimal, R.; Troispoux, V.; Périgon, S.; Scotti, I. |
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Life after disturbance (I): changes in the spatial genetic structure of Jacaranda copaia (Aubl.) D. Don (Bignonianceae) after logging in an intensively studied plot in French Guiana |
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Journal Article |
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2015 |
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Annals of Forest Science |
Abbreviated Journal |
Annals of Forest Science |
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72 |
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5 |
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509-516 |
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Amazon; Bayesian clustering; Demogenetics; Guiana shield; Parentage analysis; Regeneration; Spatial genetic structure; Tropical rainforest |
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Key message: Forest disturbance affects the within-population distribution of genetic diversity, but not its overall levels, in a tropical pioneer tree species. In particular, clumps of related saplings with impoverished diversity are found in canopy gaps but not under forest cover. Context: Forest disturbances can have long-term consequences on the genetic structure of tree populations, because they can alter the demographic properties of the regeneration process and favour some subpopulations/genotypes, both by stochastic processes and by selection. Intermediate disturbances tend to favour species diversity, at least in highly diverse communities, but their effect on intra-specific diversity is unknown. Aims: In this study, we have looked at the genetic consequences of forest disturbance in a stand of the long-lived Neotropical pioneer species, Jacaranda copaia. Methods: The study site was experimentally logged in 1984, and the canopy gaps generated by the logging were mapped. Seedlings of J. copaia colonised the gaps, as expected, at a higher density than in the surrounding forest. In 2006, we exhaustively sampled all saplings and adult trees available in a 25-ha area. The samples were genotyped at nine microsatellite loci, and the distribution of genetic diversity was inspected by analyses of spatial autocorrelation, automated Bayesian assignment and comparisons of diversity between cohorts by bootstrap (RaBoT). Results: Spatial autocorrelation was found to extend farther in post-disturbance saplings than in the undisturbed population (100 m and beyond versus less than 50 m), and divergent clumps (F<inf>ST</inf> = 0.05) of related genotypes were found; genetic diversity was found to be impoverished in each clump relative to the global population at about half of the loci. Conclusion: Overall, our results suggest that forest disturbance has changed the patterns of distribution of genetic diversity, with potential consequences on long-term population viability. © 2015, INRA and Springer-Verlag France. |
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INRA, URFM « Ecologie des Forêts Méditerranéennes », Domaine de Saint-Paul, Avignon, France |
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Export Date: 16 July 2015 |
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EcoFoG @ webmaster @ |
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611 |
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Öpik, M.; Zobel, M.; Cantero, J.J.; Davison, J.; Facelli, J.M.; Hiiesalu, I.; Jairus, T.; Kalwij, J.M.; Koorem, K.; Leal, M.E.; Liira, J.; Metsis, M.; Neshataeva, V.; Paal, J.; Phosri, C.; Põlme, S.; Reier, Ü.; Saks, Ü.; Schimann, H.; Thiéry, O.; Vasar, M.; Moora, M. |
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Global sampling of plant roots expands the described molecular diversity of arbuscular mycorrhizal fungi |
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Journal Article |
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2013 |
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Mycorrhiza |
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23 |
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5 |
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411-430 |
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454-sequencing; Biogeography; Database; Diversity; Fungal macroecology; Glomeromycota |
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We aimed to enhance understanding of the molecular diversity of arbuscular mycorrhizal fungi (AMF) by building a new global dataset targeting previously unstudied geographical areas. In total, we sampled 96 plant species from 25 sites that encompassed all continents except Antarctica. AMF in plant roots were detected by sequencing the nuclear SSU rRNA gene fragment using either cloning followed by Sanger sequencing or 454-sequencing. A total of 204 AMF phylogroups (virtual taxa, VT) were recorded, increasing the described number of Glomeromycota VT from 308 to 341 globally. Novel VT were detected from 21 sites; three novel but nevertheless widespread VT (Glomus spp. MO-G52, MO-G53, MO-G57) were recorded from six continents. The largest increases in regional VT number were recorded in previously little-studied Oceania and in the boreal and polar climatic zones – this study providing the first molecular data from the latter. Ordination revealed differences in AM fungal communities between different continents and climatic zones, suggesting that both biogeographic history and environmental conditions underlie the global variation of those communities. Our results show that a considerable proportion of Glomeromycota diversity has been recorded in many regions, though further large increases in richness can be expected in remaining unstudied areas. © 2013 Springer-Verlag Berlin Heidelberg. |
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INRA-Joint Research Unit Ecology of Guiana Forests (Ecofog), campus agronomique, BP 709, 97387 Kourou cedex, French Guiana |
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Export Date: 25 June 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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493 |
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