| Records |
| Author |
Gond, V.; Guitet, S. |
| Title |
Remote Sensing in Post-Logging Diagnoses for Forest Management in French Guiana |
Type |
Journal Article |
| Year |
2009 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal  |
Bois For. Trop. |
| Volume |
63 |
Issue |
299 |
Pages |
5-13 |
| Keywords |
selective logging; logging impact inspections; French Guiana; remote sensing; forest management |
| Abstract |
This study is part of the activities carried out to monitor tow-impact logging operations in humid tropical forests. The sustainability of these activities is highly dependent on the scale of logging damage, and managers therefore need to carry out effective checks on the quality of forestry work. In this study, remote sensing was used to track the extension of logging operations and to assess damage, through images acquired during and after logging in each parcel. Analysis of the high-resolution images (10 m) clearly identifies logged-over clearings and some skidding tracks, allowing assessments of gaps opening up in the canopy. Several parcels were monitored in this French Guiana study. A simple diagnostic procedure was established for each parcel to assess logging intensity and identify new logging tracks and timber losses. The remote sensing toot thus helps to make more accurate assessments of logging quality and to draw relevant conclusions for the logging company. The study has demonstrated the usefulness of remote sensing to identify damage after logging. The quality of restitution of the damage was validated by means of a database on the logging terrain and through field missions. This post-logging inspection tool can now be automated for fully operational use by forest managers. |
| Address |
[Gond, Valery] Univ Laval, Fac Foresterie, Umr Ecofog Guyane francaise, Cirad,UR 36, Quebec City, PQ G1V OA6, Canada |
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CIRAD-CENTRE COOPERATION INT RECHERCHE AGRONOMIQUE POUR |
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0006-579X |
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| Notes |
ISI:000266156700001 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
280 |
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| Author |
Amusant, N.; Digeon, A.; Descroix, L.; Bruneau, O.; Bezard, V.; Beauchene, J. |
| Title |
Planting rosewood for sustainable essential oil production: Influence of surrounding forest and seed provenance on tree growth and essential oil yields |
Type |
Journal Article |
| Year |
2015 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal |
Bois et Forets des Tropiques |
| Volume |
326 |
Issue |
4 |
Pages |
57-65 |
| Keywords |
Aniba rosaeodora Ducke; Dendrometric traits; Essential oil yield; French Guiana; Light effect; Plantation; Rosewood; Seed provenance |
| Abstract |
Essential oil from the Amazonian rosewood tree (Aniba rosaeodora Ducke) is valued as an important aromatic ingredient in luxury perfumes. Due to over-harvesting in recent decades, rosewood is now listed as an endangered species. Rosewood tree planting is now considered a viable alternative to logging as it can support both reforestation and sustainable agriculture thanks to sales of the essential oil extracted. We planted 605 rosewood trees in French Guiana from two seeds of local provenance, in a 5 445 m2 plot surrounded by primary forest. Nine years after planting, we assessed the effect of the position of the tree relative to the surrounding forest and of the seed provenance on dendrometric traits (height, circumference, above ground woody biomass) and hence on the yield of essential oil. Measurements were made on 99 trees. Average growth rates for the young trees were 0.7 m/year in height, 2.5 cm/year in stem circumference and 990.5 kg dry mass/ha/year in aboveground biomass, while essential oil yields ranged from 0.6% to 3.6% with a mean of 2.1%. The position of the tree relative to the surrounding forest was the main factor affecting tree growth and essential oil production: trees located close to the surrounding forest were significantly smaller and accumulated less essential oil due to the reduced availability of light. Seed provenance had less effect on dendrometric traits and essential oil yields. In conclusion, although planting practices will need to be adapted to avoid the edge effects of proximity to the forest, short-rotation cultivation of rosewood trees could be the optimum and most economically attractive system for the production of essential oil. |
| Address |
Office National des Forêts (ONF), Département R and D, Pôle de Cayenne, Réserve de Montabo, BP 87002, Cayenne Cedex, French Guiana |
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Export Date: 7 March 2016 |
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no |
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EcoFoG @ webmaster @ |
Serial |
670 |
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| Author |
Brousseau, L.; Tinaut, A.; Duret, C.; Lang, T.; Garnier-Gere, P.; Scotti, I. |
| Title |
High-throughput transcriptome sequencing and preliminary functional analysis in four Neotropical tree species |
Type |
Journal Article |
| Year |
2014 |
Publication |
BMC Genomics |
Abbreviated Journal |
BMC Genomics |
| Volume |
15 |
Issue |
238 |
Pages |
1-13 |
| Keywords |
454-Pyrosequencing; Polymorphism discovery; Tropical rainforest tree species |
| Abstract |
Background: The Amazonian rainforest is predicted to suffer from ongoing environmental changes. Despite the need to evaluate the impact of such changes on tree genetic diversity, we almost entirely lack genomic resources. Results: In this study, we analysed the transcriptome of four tropical tree species (Carapa guianensis, Eperua falcata, Symphonia globulifera and Virola michelii) with contrasting ecological features, belonging to four widespread botanical families (respectively Meliaceae, Fabaceae, Clusiaceae and Myristicaceae). We sequenced cDNA libraries from three organs (leaves, stems, and roots) using 454 pyrosequencing. We have developed an R and bioperl-based bioinformatic procedure for de novo assembly, gene functional annotation and marker discovery. Mismatch identification takes into account single-base quality values as well as the likelihood of false variants as a function of contig depth and number of sequenced chromosomes. Between 17103 (for Symphonia globulifera) and 23390 (for Eperua falcata) contigs were assembled. Organs varied in the numbers of unigenes they apparently express, with higher number in roots. Patterns of gene expression were similar across species, with metabolism of aromatic compounds standing out as an overrepresented gene function. Transcripts corresponding to several gene functions were found to be over- or underrepresented in each organ. We identified between 4434 (for Symphonia globulifera) and 9076 (for Virola surinamensis) well-supported mismatches. The resulting overall mismatch density was comprised between 0.89 (S. globulifera) and 1.05 (V. surinamensis) mismatches/100 bp in variation-containing contigs.Conclusion: The relative representation of gene functions in the four transcriptomes suggests that secondary metabolism may be particularly important in tropical trees. The differential representation of transcripts among tissues suggests differential gene expression, which opens the way to functional studies in these non-model, ecologically important species. We found substantial amounts of mismatches in the four species. These newly identified putative variants are a first step towards acquiring much needed genomic resources for tropical tree species. © 2014 Brousseau et al.; licensee BioMed Central Ltd. |
| Address |
BIOGECO, UMR 1202, University of Bordeaux, F-33400 Talence, France |
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| Publisher |
BioMed Central Ltd. |
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14712164 (Issn) |
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Export Date: 18 April 2014; Source: Scopus; Art. No.: 238; Coden: Bgmee; Language of Original Document: English; Correspondence Address: Scotti, I.; INRA, UMR 0745 EcoFoG, Campus agronomique BP 709, F-97387 Cedex, France; email: ivan.scotti@ecofog.gf |
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no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
537 |
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| Author |
Audigeos, D.; Buonamici, A.; Belkadi, L.; Rymer, P.; Boshier, D.; Scotti-Saintagne, C.; Vendramin, G.G.; Scotti, I. |
| Title |
Aquaporins in the wild: natural genetic diversity and selective pressure in the PIP gene family in five Neotropical tree species |
Type |
Journal Article |
| Year |
2010 |
Publication |
BMC Evolutionary Biology |
Abbreviated Journal |
BMC Evol. Biol. |
| Volume |
10 |
Issue |
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Pages |
18 |
| Keywords |
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| Abstract |
Background: Tropical trees undergo severe stress through seasonal drought and flooding, and the ability of these species to respond may be a major factor in their survival in tropical ecosystems, particularly in relation to global climate change. Aquaporins are involved in the regulation of water flow and have been shown to be involved in drought response; they may therefore play a major adaptive role in these species. We describe genetic diversity in the PIP sub-family of the widespread gene family of Aquaporins in five Neotropical tree species covering four botanical families. Results: PIP Aquaporin subfamily genes were isolated, and their DNA sequence polymorphisms characterised in natural populations. Sequence data were analysed with statistical tests of standard neutral equilibrium and demographic scenarios simulated to compare with the observed results. Chloroplast SSRs were also used to test demographic transitions. Most gene fragments are highly polymorphic and display signatures of balancing selection or bottlenecks; chloroplast SSR markers have significant statistics that do not conform to expectations for population bottlenecks. Although not incompatible with a purely demographic scenario, the combination of all tests tends to favour a selective interpretation of extant gene diversity. Conclusions: Tropical tree PIP genes may generally undergo balancing selection, which may maintain high levels of genetic diversity at these loci. Genetic variation at PIP genes may represent a response to variable environmental conditions. |
| Address |
[Audigeos, Delphine; Belkadi, Laurent; Scotti-Saintagne, Caroline; Scotti, Ivan] INRA, UMR EcoFoG Ecol Forets Guyane 0745, Kourou 97387, French Guiana, Email: ivan.scotti@cirad.fr |
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| Publisher |
BIOMED CENTRAL LTD |
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Edition |
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| ISSN |
1471-2148 |
ISBN |
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| Notes |
ISI:000280369200002 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
47 |
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| Author |
Wagner, F.; Rutishauser, E.; Blanc, L.; Herault, B. |
| Title |
Effects of Plot Size and Census Interval on Descriptors of Forest Structure and Dynamics |
Type |
Journal Article |
| Year |
2010 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
| Volume |
42 |
Issue |
6 |
Pages |
664-671 |
| Keywords |
Amazonia; biomass fluxes; coefficient of variation; forest permanent plots; turnover rates; WinBUGS |
| Abstract |
This study was designed to explicitly formulate the effect of census interval and plot size on the variability of descriptors of tropical forest structure (stand density, basal area, aboveground biomass [AGB]) and dynamic (tree growth, mortality and recruitment rates, biomass fluxes). A unique dataset from a broad plot network (37.5 ha) surveyed every 2 yr over a 16-yr period was used to develop and parameterize a new statistical model predicting the coefficients of variation for each forest descriptor. More than 90 percent of the inherent variability of these coefficients was predicted using a simple model including plot size and census interval in a Bayesian modeling framework. All descriptors of forest structure varied by <10 percent for plot sizes 42 ha. Among the descriptors of forest dynamics, AGB loss was the most variable. The number of 6.25 ha plots required to estimate its mean, over a 16-yr period, within a 20 percent error of the mean remains above four. This contrasts with a relative constant flux of biomass entering the plot through tree growth and tree recruitment. Tree growth was remarkably well estimated with <15 percent variability for a 2-yr census in a plot of 2 ha. This study provides an easy method to assess dataset limitations in efforts to estimate descriptors of forest structure and dynamic, which is of primary importance to decipher any clear consequences of global change in tropical forests. |
| Address |
[Wagner, Fabien; Herault, Bruno] Univ Antilles Guyane, UMR Ecol Forets Guyane, Kourou 97379, French Guiana, Email: bruno.herault@ecofog.gf |
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| Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
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0006-3606 |
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| Notes |
ISI:000283949700006 |
Approved |
no |
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EcoFoG @ eric.marcon @ |
Serial |
16 |
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| Author |
Vantaux, A.; Roux, O.; Magro, A.; Ghomsi, N.T.; Gordon, R.D.; Dejean, A.; Orivel, J. |
| Title |
Host-Specific Myrmecophily and Myrmecophagy in the Tropical Coccinellid Diomus thoracicus in French Guiana |
Type |
Journal Article |
| Year |
2010 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
| Volume |
42 |
Issue |
5 |
Pages |
622-629 |
| Keywords |
ants; ladybird; mimicry; parasite; Wasmannia auropunctata |
| Abstract |
A variety of arthropods, particularly insects, have developed myrmecophilous interactions with ants to gain access to resources and/or for protection. Among these myrmecophiles, only a few examples have been documented in the Coccinellidae, most of them involving species able to feed on ant-tended Hemiptera. We report here a new case of obligate myrmecophily in the coccinellid Diomus thoracicus. Larvae are invariably and exclusively found in the nests of the ant Wasmannia auropunctata and seem to rely on ant brood as their only food source. Not only do ant workers show no aggressiveness toward the D. thoracicus larvae in their behavioral interactions at the colonial level, but also at the species level; while coccinellid adults are always attacked. The integration of the larvae inside of the ant nests is based on their chemical mimicry of the host's cuticular cues. Therefore, given the presence of the D. thoracicus larvae inside of the ant's nest, their predation on Wasmannia brood and their chemical mimicry, this species can be considered a specific parasite of W. auropunctata. Overall, this new case of myrmecophily not only specifically involves a highly invasive ant species, but also provides insights into the evolution of myrmecophily and myrmecophagy in coccinellids. |
| Address |
[Vantaux, Amelie; Magro, Alexandra; Orivel, Jerome] Univ Toulouse, UPS, EDB Lab Evolut & Diversite Biol, F-31062 Toulouse, France, Email: orivel@cict.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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0006-3606 |
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| Notes |
ISI:000281707700025 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
27 |
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Ruiz-Gonzalez, M.X.; Corbara, B.; Leroy, C.; Dejean, A.; Orivel, J. |
| Title |
The Weaver Wasp: Spinning Fungus into a Nest |
Type |
Journal Article |
| Year |
2010 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
| Volume |
42 |
Issue |
4 |
Pages |
402-404 |
| Keywords |
Allomerus decemarticulatus; French Guiana; Hirtella physophora; nest architecture; Nitela constructor; wasp biology |
| Abstract |
Wasp nests range from simple to complex structures made of paper or mud. Here, we show that a Neotropical wasp of the genus Nitela builds its nest entirely by weaving endophytic fungal hyphae and spider silk harvested from the leaves growing in the understory of the rain forest in French Guiana. |
| Address |
[Ruiz-Gonzalez, Mario X.; Orivel, Jerome] Univ Toulouse, UPS, EDB, Lab Evolut & Divers Biol, F-31062 Toulouse, France, Email: orivel@cict.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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0006-3606 |
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ISI:000279438900002 |
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no |
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EcoFoG @ eric.marcon @ |
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54 |
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| Author |
Baraloto, C.; Couteron, P. |
| Title |
Fine-scale Microhabitat Heterogeneity in a French Guianan Forest |
Type |
Journal Article |
| Year |
2010 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
| Volume |
42 |
Issue |
4 |
Pages |
420-428 |
| Keywords |
canopy gap; geostatistics; light availability; microclimate; soil moisture; soil nutrients; topography |
| Abstract |
We examined fine-scale heterogeneity of environmental conditions in a primary rain forest in French Guiana to describe variation in microhabitats that plants may experience during establishment. We characterized both the range as well as the spatial structuring of 11 environmental factors important for seedling establishment in six hexagonal sampling grids, one each in gap and understory sites at three points representing the predominant geomorphic units in this primary forest. Each grid contained 37 sampling points separated by 31 cm-20 m. Monte-Carlo tests of semivariograms against complete spatial randomness indicated that for many variables in all six sampling grids, spatial dependence did not exceed 1 m. A principal component analysis of all sampling points revealed a lack of spatial microhabitat structure, rather than homogeneous patches associated with canopy structure or geomorphology. Our results suggest that ample fine-scale spatial heterogeneity exists to support the coexistence of plant species with differential abiotic requirements for regeneration. |
| Address |
[Baraloto, Christopher] INRA, UMR Ecol Forets Guyane, F-97387 Kourou, France, Email: chris.baraloto@ecofog.gf |
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WILEY-BLACKWELL PUBLISHING, INC |
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0006-3606 |
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ISI:000279438900005 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
55 |
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Paine, C.E.T.; Harms, K.E.; Schnitzer, S.A.; Carson, W.P. |
| Title |
Weak competition among tropical tree seedlings: Implications for species coexistence |
Type |
Journal Article |
| Year |
2008 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
| Volume |
40 |
Issue |
4 |
Pages |
432-440 |
| Keywords |
Brosimum alicastrum; competitive irrelevance; maintenance of biodiversity; Matisia cordata; resource competition; Panama; Peru; Pouteria reticulata; zone of influence |
| Abstract |
The intensity of competition among forest tree seedlings is poorly understood, but has important ramifications for their recruitment and for the maintenance of species diversity. Intense competition among seedlings could allow competitively dominant species to exclude subordinate species. Alternatively, the low density and small stature of forest tree seedlings could preclude intense interseedling competition. In this case, other processes, such as size-asymmetric competition with adults, interactions with consumers, or neutral dynamics would prevail as those structuring the forest understory. We tested the intensity of, and potential for, intraspecific competition among tree seedlings of three species (Brosimum alicastrum, Matisia cordata, and Pouteria reticulata) in two Neotropical rain forests. We reduced stem densities by up to 90 percent and monitored individual growth and survival rates for up to 24 mo. Individual growth and survival rates were generally unrelated to stem density. Contrary to the predicted behavior of intensely competing plant populations, the distribution of individual heights did not become more left-skewed with time for any species, regardless of plot density; i.e., excesses of short, suppressed individuals did not accumulate in high-density plots. We further measured the overlap of zones of influence (ZOIs) to assess the potential for resource competition. Seedling ZOIs overlapped only slightly in extremely dense monodominant plots, and even less in ambient-density plots of mixed composition. Our results thus suggest that interseedling competition was weak. Given the low density of tree seedlings in Neotropical forests, we infer that resource competition among seedlings may be irrelevant to their recruitment. |
| Address |
[Paine, C. E. Timothy; Harms, Kyle E.] Louisiana State Univ, Dept Biol Sci, Baton Rouge, LA 70803 USA, Email: cetpaine@gmail.com |
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BLACKWELL PUBLISHING |
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0006-3606 |
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| Notes |
ISI:000257717500006 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
134 |
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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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| Notes |
ISI:000222092900006 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
264 |
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