| Records |
| Author |
Aubry-Kientz, M.; Herault, B.; Ayotte-Trépanier, C.; Baraloto, C.; Rossi, V. |
| Title |
Toward Trait-Based Mortality Models for Tropical Forests |
Type |
Journal Article |
| Year |
2013 |
Publication |
PLoS ONE |
Abbreviated Journal |
PLoS ONE |
| Volume |
8 |
Issue |
5 |
Pages |
e63678 |
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| Abstract |
Tree mortality in tropical forests is a complex ecological process for which modelling approaches need to be improved to better understand, and then predict, the evolution of tree mortality in response to global change. The mortality model introduced here computes an individual probability of dying for each tree in a community. The mortality model uses the ontogenetic stage of the tree because youngest and oldest trees are more likely to die. Functional traits are integrated as proxies of the ecological strategies of the trees to permit generalization among all species in the community. Data used to parametrize the model were collected at Paracou study site, a tropical rain forest in French Guiana, where 20,408 trees have been censused for 18 years. A Bayesian framework was used to select useful covariates and to estimate the model parameters. This framework was developed to deal with sources of uncertainty, including the complexity of the mortality process itself and the field data, especially historical data for which taxonomic determinations were uncertain. Uncertainty about the functional traits was also considered, to maximize the information they contain. Four functional traits were strong predictors of tree mortality: wood density, maximum height, laminar toughness and stem and branch orientation, which together distinguished the light-demanding, fast-growing trees from slow-growing trees with lower mortality rates. Our modelling approach formalizes a complex ecological problem and offers a relevant mathematical framework for tropical ecologists to process similar uncertain data at the community level. © 2013 Aubry-Kientz et al. |
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INRA, UMR 'Ecologie des Forêts de Guyane', Kourou, France |
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19326203 (Issn) |
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Export Date: 23 May 2013; Source: Scopus; Art. No.: e63678; :doi 10.1371/journal.pone.0063678; Language of Original Document: English; Correspondence Address: Aubry-Kientz, M.; Université des Antilles et de la Guyane, UMR 'Ecologie des Forêts de Guyane', Kourou, France; email: melaine.aubry-kientz@ecofog.gf |
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EcoFoG @ webmaster @ |
Serial |
486 |
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| Author |
Morel, H.; Lehnebach, R.; Cigna, J.; Ruelle, J.; Nicolini, É.; Beauchene, J. |
| Title |
Basic wood density variations of Parkia velutina Benoist, a long-lived heliophilic Neotropical rainforest tree |
Type |
Journal Article |
| Year |
2018 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal |
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| Volume |
335 |
Issue |
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Pages |
59-69 |
| Keywords |
Curvilinear pattern; French Guiana; Intra-tree; Tropical species |
| Abstract |
Investigations of basic radial wood density (WD) in tropical trees revealed linear patterns and some curvilinear patterns. Studies usually disregard longitudinal variations, which are often considered to be similar to radial variations. This study aimed to show (1) a new radial curvilinear WD pattern, (2) differences in amplitude between radial and longitudinal gradients and (3) to partition WD variations according to different scales in Parkia velutina, an emergent tree found in Neotropical rain forests. We collected full discs from six felled trees and radial cores from 10 standing trees to check WD variability, plus one dominant axis per tree for analysis of height growth rates. This species showed very high growth rates indicative of heliophilic habits. WD varied from 0.194 to 0.642 g/cm3. Such amplitude is rarely observed within the same tree. Radial variation in WD was curvilinear, with an amplitude generally less than the longitudinal amplitude. Consequently, in mature trees, WD values in the crown were higher than those in the outer trunk. WD variations can be highly significant at different scales. The variance partitioning also revealed that the whole WD range of Parkia velutina is more accurately estimated intra-individually when both longitudinal and radial gradient are covered. |
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INRA, LERFoB, AgroParisTech, Nancy, France |
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Export Date: 20 April 2018 |
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EcoFoG @ webmaster @ |
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799 |
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| Author |
Degen, B.; Roubilk, D.W. |
| Title |
Effects of animal pollination on pollen dispersal, selfing, and effective population size of tropical trees: A simulation study |
Type |
Journal Article |
| Year |
2004 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
| Volume |
36 |
Issue |
2 |
Pages |
165-179 |
| Keywords |
Amazon; bees; Brazil; Dipteryx; Jacaranda; model; pollination; sensitivity analysis; trees |
| Abstract |
Animals, especially insects, are principal pollen vectors of tropical trees and have behavior patterns that affect gene dispersal. Here, we explore complex pollination systems using a new simulation model Eco-Gene and considering, among other factors, flowering synchrony. spatial distribution of trees, degree of selfing, population densities, pollinator flight distances, pollen deposition, and pollinator response to floral display size. Sensitivity analyses using two contrasting tree data sets (Jacaranda copaia and Dipteryx odorata) determined the importance of each parameter on three response variables: the proportion of seeds from self-pollination, effective population size, and pollen dispersal. Spatial considerations and attractiveness of floral displays were prominent features determining the population genetic result of pollinators, and some biological implications of the results are discussed. |
| Address |
INRA, Kourou 97387, French Guiana, Email: degen_b@kourou.cirad.fr |
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ASSOC TROPICAL BIOLOGY INC |
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0006-3606 |
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ISI:000222092900006 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
264 |
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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. |
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INRA, F-33612 Cestas, France, Email: alexandre.bosc@pierroton.inra.fr |
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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 |
Roggy, J.C.; Moiroud, A.; Lensi, R.; Domenach, A.M. |
| Title |
Estimating N transfers between N-2-fixing actinorhizal species and the non-N-2-fixing Prunus avium under partially controlled conditions |
Type |
Journal Article |
| Year |
2004 |
Publication |
Biology and Fertility of Soils |
Abbreviated Journal |
Biol. Fertil. Soils |
| Volume |
39 |
Issue |
5 |
Pages |
312-319 |
| Keywords |
actinorhizal trees; mixed culture; litter; N transfer by roots; N-15 |
| Abstract |
Two methods of N transfer between plants-by litter decomposition and root-to-root exchange-were examined in mixed plantations of N-fixing and non-fixing trees. Nitrogen transfers from decaying litters were measured by placing N-15-labelled litters from four actinorhizal tree species around shoots of containerized Prunus avium. Nitrogen transfers by root-to-root exchanges were measured after foliar NO3-N-15 fertilization of Alnus subcordata and Elaeagnus angustifolia growing in containers in association with P. avium. During the first 2 years of litter decomposition, from 5-20% of the N, depending on the litter identity, was released and taken up by P. avium. N availability in the different litters was strongly correlated with the amount of water-soluble N, which was highest in leaves of E. angustifolia. In the association between fixing and non-fixing plants, 7.5% of the A. subcordata N and 25% of E. angustifolia N was transferred to P. avium by root exchange. These results showed that the magnitude of N transfers by root exchange depended on the associated N-2-fixing species. Among the species investigated, E. angustifolia displayed the highest capacity for exudating N from roots as well as for releasing N from litters. These qualities make this tree a promising species for enhancing wood yields in mixed stands. |
| Address |
INRA, ENGREF, CIRAD, Unite Mixte Rech,Lab Ecol Forets Trop Guyane, Kourou 97387, French Guiana, Email: roggy.j@cirad.fr |
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SPRINGER-VERLAG |
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0178-2762 |
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| Notes |
ISI:000221197000002 |
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no |
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EcoFoG @ eric.marcon @ |
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236 |
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| Author |
Roggy, J.C.; Nicolini, E.; Imbert, P.; Caraglio, Y.; Bosc, A.; Heuret, P. |
| Title |
Links between tree structure and functional leaf traits in the tropical forest tree Dicorynia guianensis Amshoff (Caesalpiniaceae) |
Type |
Journal Article |
| Year |
2005 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
| Volume |
62 |
Issue |
6 |
Pages |
553-564 |
| Keywords |
Dicorynia guianensis; leaf structure; functional leaf traits; plasticity; tree structure |
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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. |
| 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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1286-4560 |
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| Notes |
ISI:000232084400009 |
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no |
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EcoFoG @ eric.marcon @ |
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229 |
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| Author |
Doughty, C.E.; Wolf, A.; Baraloto, C.; Malhi, Y. |
| Title |
Interdependency of plants and animals in controlling the sodium balance of ecosystems and the impacts of global defaunation |
Type |
Journal Article |
| Year |
2016 |
Publication |
Ecography |
Abbreviated Journal |
Ecography |
| Volume |
39 |
Issue |
2 |
Pages |
204-212 |
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| Abstract |
Sodium, an element which is needed by animals but often toxic in high concentrations to plants, may be deficient and limit animal abundance in inland continental regions, but may be overabundant and limit plant productivity in coastal regions. Here we present data from 50 independent plots (including leaf data from more than 2480 individual trees) showing that leaves in the Amazon basin uptake high amounts of sodium (Na) in a manner more similar to the essential cation potassium (K) than to the toxic cation aluminium (Al). Leaf Na increases linearly with soil Na concentrations, and there is no apparent mechanism for selective exclusion of Na in comparison to K, a key attribute of halophytes. This indicates that the Amazon basin is broadly non-halophytic and increased sodium concentrations in non-halophyte plants often decrease plant productivity. Total Na concentrations are ∼ 10 times higher in coastal regions than inland regions. Such concentration gradients in nutrients may have been reduced in the past because large animals that were abundant in the Pleistocene have been hypothesized to play a large role in reducing nutrient concentration gradients at continental scales. We use a diffusion model and a Na loss rate based on empirical data to estimate that large animals may have moved significant quantities of Na inland away from coastal regions in the Amazon Basin. Therefore, our simple model suggests that large animals may play an important, yet diminishing, role in maintaining the sodium balance of the planet. © 2016 Nordic Society Oikos. |
| Address |
INRA UMR Ecologie des Forêts de Guyane, French Guiana, and International Center for Tropical Botany, Dept of Biological Sciences, Florida International Univ., Miami, United States |
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Cited By :2; Export Date: 12 February 2016 |
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no |
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EcoFoG @ webmaster @ |
Serial |
657 |
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| Author |
Zinger, L.; Chave, J.; Coissac, E.; Iribar, A.; Louisanna, E.; Manzi, S.; Schilling, V.; Schimann, H.; Sommeria-Klein, G.; Taberlet, P. |
| Title |
Extracellular DNA extraction is a fast, cheap and reliable alternative for multi-taxa surveys based on soil DNA |
Type |
Journal Article |
| Year |
2016 |
Publication |
Soil Biology and Biochemistry |
Abbreviated Journal |
Soil Biology and Biochemistry |
| Volume |
96 |
Issue |
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Pages |
16-19 |
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DNA extraction protocol; DNA metabarcoding; Multi-taxa biodiversity; Tropical forest |
| Abstract |
DNA metabarcoding on soil samples is increasingly used for large-scale and multi-taxa biodiversity studies. However, DNA extraction may be a major bottleneck for such wide uses. It should be cost/time effective and allow dealing with large sample volumes so as to maximise the representativeness of both micro- and macro-organisms diversity. Here, we compared the performances of a fast and cheap extracellular DNA extraction protocol with a total DNA extraction method in retrieving bacterial, eukaryotic and plant diversity from tropical soil samples of ca. 10 g. The total DNA extraction protocol yielded more high-quality DNA. Yet, the extracellular DNA protocol provided similar diversity assessments although it presented some differences in clades relative abundance and undersampling biases. We argue that extracellular DNA is a good compromise between cost, labor, and accuracy for high-throughput DNA metabarcoding studies of soil biodiversity. © 2016 Elsevier Ltd. |
| Address |
INRA UMR ECOFOG, Kourou, French Guiana |
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Export Date: 17 February 2016 |
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no |
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EcoFoG @ webmaster @ |
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663 |
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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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HERON PUBLISHING |
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0829-318X |
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ISI:000260027200009 |
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no |
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EcoFoG @ eric.marcon @ |
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129 |
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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) |
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Journal Article |
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2005 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
| Volume |
25 |
Issue |
12 |
Pages |
1545-1552 |
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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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ISI:000234019900008 |
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EcoFoG @ webmaster @ |
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281 |
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