| Records |
| Author |
Rutishauser, E.; Barthelemy, D.; Blanc, L.; Nicolini, E.A. |
| Title |
Crown fragmentation assessment in tropical trees: Method, insights and perspectives |
Type |
Journal Article |
| Year |
2011 |
Publication |
Forest Ecology and Management |
Abbreviated Journal |
For. Ecol. Manage. |
| Volume |
261 |
Issue  |
3 |
Pages |
400-407 |
| Keywords |
Crown assessment; Crown fragmentation; Tree mortality; Forest dynamics |
| Abstract |
Decreasing growth rate (Feeley et al., 2007) and large die-back due to drought (Phillips et al., 2009) suggest that tropical forests are suffering recent climate changes. Forest vulnerability to external factors (e.g. air pollution, acid rain) is widely studied in northern countries, while only a few attempts have investigated crown integrity in the Tropics. The method needs to be generic enough to account for the large number of species and crown shapes encountered in tropical forests. In the present study, we developed and tested a novel field method that estimates crown fragmentation (main branch mortality (MB) and secondary branch mortality (SB)), liana infestation (LI) and crown position (CP) in the canopy. The relationship between crown fragmentation and annual growth rate (agr) was investigated through multiple regression. Six out of eight canopy tree species showed significant growth decline with increasing crown fragmentation. Higher probability of death was also found in trees with severe crown fragmentation. The capacity of such crown assessment to depict tree vitality in a forest stand is discussed along with potential applications in both forest science and management. (C) 2010 Elsevier B.V. All rights reserved. |
| Address |
[Rutishauser, Ervan; Eric-Andre, Nicolini] Cirad UMR AMAP, F-34398 Montpellier 5, France, Email: er.rutishauser@gmail.com |
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Thesis |
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| Publisher |
ELSEVIER SCIENCE BV |
Place of Publication |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0378-1127 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
ISI:000287333000009 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
293 |
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| Author |
Lebrini, M.; Robert, F.; Roos, C. |
| Title |
Alkaloids Extract from Palicourea guianensis Plant as Corrosion Inhibitor for C38 Steel in 1 M Hydrochloric Acid Medium |
Type |
Journal Article |
| Year |
2011 |
Publication |
International Journal of Electrochemical Science |
Abbreviated Journal |
Int. J. Electrochem. Sci. |
| Volume |
6 |
Issue |
3 |
Pages |
847-859 |
| Keywords |
Palicourea guianensis; corrosion inhibitors; C38 steel; acidic media; adsorption |
| Abstract |
Corrosion inhibition effect of alkaloids extract from Palicourea guianensis plant (AEPG) on C38 tell in 1 M HCl medium has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The polarization studies that AEPG acts as mixed-type inhibitor. The electrochemical impedance spectroscopy showed that the charge transfer resistance increases and the double layer capacitance decreases on increasing plant extract concentration. The inhibition efficiency of the extract obtained from impedance and polarization measurements was in a good agreement and was found to increase with increasing concentration of the extract. Inhibition efficiency of 89% was achieved with 100 mg L-1 of AEPG at 25 degrees C. The obtained results showed that, the Palicourea guianensis extract could serve as an effective inhibitor for the corrosion of steel in acid media. The adsorption of AEPG obeys the Langmuir adsorption isotherm. |
| Address |
[Lebrini, M.; Robert, F.; Roos, C.] UAG UMR ECOFOG, Lab Mat & Mol Milieu Amazonien, Cayenne 97337, French Guiana, Email: florent.robert@guyane.univ-ag.fr |
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Thesis |
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| Publisher |
Electrochemical Science Group |
Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
1452-3981 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
ISI:000287820500026 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
298 |
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| Author |
Lecante, A.; Robert, F.; Blandinieres, P.A.; Roos, C. |
| Title |
Anti-corrosive properties of S. tinctoria and G. ouregou alkaloid extracts on low carbon steel |
Type |
Journal Article |
| Year |
2011 |
Publication |
Current Applied Physics |
Abbreviated Journal |
Curr. Appl. Phys. |
| Volume |
11 |
Issue |
3 |
Pages |
714-724 |
| Keywords |
Low carbon steel; Acidic media; Corrosion inhibitor; Plant extract; EIS |
| Abstract |
The effect of alkaloid extracts from two Amazonian trees (Guatteria ouregou and Simira tinctoria) on low carbon steel corrosion was investigated in acidic solutions by using electrochemical techniques. All of these plant extracts inhibit the corrosion of low carbon steel in 0.1 M HCl solutions. As their concentration increases to 250 mg/L, the inhibition efficiencies of S. tinctoria and G. ouregou alkaloid extracts reach approximately 92% in 0.1 M HCl solutions. The adsorption of the inhibitor molecules was in accordance with the Langmuir adsorption isotherm. The results obtained show that these plant extracts could be serve as an effective inhibitor for the corrosion of low carbon steel in hydrochloric acid media. Furthermore, harmane was identified as the main component of S. tinctoria extract and that suggests that it is the active ingredient against corrosion of low carbon steel. (C) 2010 Elsevier B.V. All rights reserved. |
| Address |
[Lecante, A.; Robert, F.; Blandinieres, P. A.; Roos, C.] UAG UMR ECOFOG, Lab Mat & Mol Milieu Amazonien, F-97337 Cayenne, French Guiana, France, Email: florent.robert@guyane.univ-ag.fr |
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Thesis |
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| Publisher |
Elsevier Science Bv |
Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
1567-1739 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
ISI:000288183300088 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
300 |
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| Author |
Siebicke, L.; Steinfeld, G.; Foken, T. |
| Title |
CO2-gradient measurements using a parallel multi-analyzer setup |
Type |
Journal Article |
| Year |
2011 |
Publication |
Atmospheric Measurement Techniques |
Abbreviated Journal |
Atmos. Meas. Tech. |
| Volume |
4 |
Issue |
3 |
Pages |
409-423 |
| Keywords |
|
| Abstract |
Accurate CO2 concentration gradient measurements are needed for the computation of advective flux terms, which are part of the full Net Ecosystem Exchange (NEE) budget equation. A typical draw back of current gradient measurement designs in advection research is the inadequate sampling of complex flow phenomena using too few observation points in space and time. To overcome this draw back, a new measurement design is presented which allows the parallel measurement of several sampling points at a high frequency. Due to the multi-analyzer nature of the design, inter-instrument bias becomes more of a concern compared to conventional setups. Therefore a statistical approach is presented which allows for accurate observations of concentration gradients, which are typically small in relation to analyzer accuracy, to be obtained. This bias correction approach applies a conditional, time dependent signal correction. The correction depends on a mixing index based on cross correlation analysis, which characterizes the degree of mixing of the atmosphere between individual sample points. The approach assumes statistical properties of probability density functions (pdf) of concentration differences between a sample point and the field average which are common to the pdf's from several sample points. The applicability of the assumptions made was tested by Large Eddy Simulation (LES) using the model PALM and could be verified for a test case of well mixed conditions. The study presents concentration time series before and after correction, measured at a 2 m height in the sub-canopy at the FLUXNET spruce forest site Waldstein-Weidenbrunnen (DE-Bay), analyzes the dependence of statistical parameters of pdf's from atmospheric parameters such as stratification, quantifies the errors and evaluates the performance of the bias correction approach. The improvements that are achieved by applying the bias correction approach are one order of magnitude larger than possible errors associated with it, which is a strong incentive to use the correction approach. In conclusion, the presented bias correction approach is well suited for – but not limited to – horizontal gradient measurements in a multi-analyzer setup, which would not have been reliable without this approach. Finally, possible future improvements of the bias correction approach are outlined and further fields of application indicated. |
| Address |
[Siebicke, L.; Foken, T.] Univ Bayreuth, Dept Micrometeorol, Bayreuth, Germany, Email: lukas.siebicke@ecofog.gf |
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Thesis |
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| Publisher |
Copernicus Gesellschaft Mbh |
Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
1867-1381 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
ISI:000288911000002 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
303 |
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| Author |
Dejean, A.; Corbara, B.; Leroy, C.; Delabie, J.H.C.; Rossi, V.; Cereghino, R. |
| Title |
Inherited Biotic Protection in a Neotropical Pioneer Plant |
Type |
Journal Article |
| Year |
2011 |
Publication |
PLoS One |
Abbreviated Journal |
PLoS One |
| Volume |
6 |
Issue |
3 |
Pages |
e18071 |
| Keywords |
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| Abstract |
Chelonanthus alatus is a bat-pollinated, pioneer Gentianaceae that clusters in patches where still-standing, dried-out stems are interspersed among live individuals. Flowers bear circum-floral nectaries (CFNs) that are attractive to ants, and seed dispersal is both barochorous and anemochorous. Although, in this study, live individuals never sheltered ant colonies, dried-out hollow stems – that can remain standing for 2 years – did. Workers from species nesting in dried-out stems as well as from ground-nesting species exploited the CFNs of live C. alatus individuals in the same patches during the daytime, but were absent at night (when bat pollination occurs) on 60.5% of the plants. By visiting the CFNs, the ants indirectly protect the flowers – but not the plant foliage – from herbivorous insects. We show that this protection is provided mostly by species nesting in dried-out stems, predominantly Pseudomyrmex gracilis. That dried-out stems remain standing for years and are regularly replaced results in an opportunistic, but stable association where colonies are sheltered by one generation of dead C. alatus while the live individuals nearby, belonging to the next generation, provide them with nectar; in turn, the ants protect their flowers from herbivores. We suggest that the investment in wood by C. alatus individuals permitting still-standing, dried-out stems to shelter ant colonies constitutes an extended phenotype because foraging workers protect the flowers of live individuals in the same patch. Also, through this process these dried-out stems indirectly favor the reproduction (and so the fitness) of the next generation including both their own offspring and that of their siblings, all adding up to a potential case of inclusive fitness in plants. |
| Address |
[Dejean, Alain; Leroy, Celine] CNRS, Ecol Forets Guyane UMR CNRS 8172, Kourou, France, Email: alain.dejean@wanadoo.fr |
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Thesis |
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| Publisher |
Public Library Science |
Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
1932-6203 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
ISI:000289057200023 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
306 |
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| Author |
Chevolot, M.; Louisanna, E.; Azri, W.; Leblanc-Fournier, N.; Roeckel-Drevet, P.; Scotti-Saintagne, C.; Scotti, I. |
| Title |
Isolation of primers for candidate genes for mechano-sensing in five Neotropical tree species |
Type |
Journal Article |
| Year |
2011 |
Publication |
Tree Genetics & Genomes |
Abbreviated Journal |
Tree Genet. Genomes |
| Volume |
7 |
Issue |
3 |
Pages |
655-661 |
| Keywords |
Population genomics; Functional gene; Mechanical signals; Fabaceae |
| Abstract |
Mechanical signals have an impact on plant development. Tropical rainforest trees display large variability for life-history traits related to biomechanics and therefore are a unique study system to better understand biomechanical trait variability from an evolutionary perspective. From sequences and gene expression data available in model species, we developed specific primers for six candidate genes for mechano-sensing in five tropical species. Most of the gene sequences were polymorphic in most species. |
| Address |
[Chevolot, Malia; Louisanna, Eliane; Scotti-Saintagne, Caroline; Scotti, Ivan] INRA, Unite Mixte Rech Ecol Forets Guyane, Kourou 97310, French Guiana, Email: ivan.scotti@ecofog.gf |
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Thesis |
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| Publisher |
Springer Heidelberg |
Place of Publication |
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Summary Language |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
1614-2942 |
ISBN |
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Medium |
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Conference |
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| Notes |
ISI:000290571900018 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
315 |
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| Author |
Ruiz-Gonzalez, M.X.; Male, P.J.G.; Leroy, C.; Dejean, A.; Gryta, H.; Jargeat, P.; Quilichini, A.; Orivel, J. |
| Title |
Specific, non-nutritional association between an ascomycete fungus and Allomerus plant-ants |
Type |
Journal Article |
| Year |
2011 |
Publication |
Biology Letters |
Abbreviated Journal |
Biol. Lett. |
| Volume |
7 |
Issue |
3 |
Pages |
475-479 |
| Keywords |
ant-fungus association; Cordia nodosa; Chaetothyriales; Hirtella physophora; myrmecophyte; population structure |
| Abstract |
Ant-fungus associations are well known from attine ants, whose nutrition is based on a symbiosis with basidiomycete fungi. Otherwise, only a few non-nutritional ant-fungus associations have been recorded to date. Here we focus on one of these associations involving Allomerus plant-ants that build galleried structures on their myrmecophytic hosts in order to ambush prey. We show that this association is not opportunistic because the ants select from a monophyletic group of closely related fungal haplotypes of an ascomycete species from the order Chaetothyriales that consistently grows on and has been isolated from the galleries. Both the ants' behaviour and an analysis of the genetic population structure of the ants and the fungus argue for host specificity in this interaction. The ants' behaviour reveals a major investment in manipulating, growing and cleaning the fungus. A molecular analysis of the fungus demonstrates the widespread occurrence of one haplotype and many other haplotypes with a lower occurrence, as well as significant variation in the presence of these fungal haplotypes between areas and ant species. Altogether, these results suggest that such an interaction might represent an as-yet undescribed type of specific association between ants and fungus in which the ants cultivate fungal mycelia to strengthen their hunting galleries. |
| Address |
[Leroy, Celine; Dejean, Alain; Quilichini, Angelique; Orivel, Jerome] CNRS, UMR Ecol Forets Guyane 8172, F-97379 Kourou, France, Email: jerome.orivel@ecofog.gf |
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| Publisher |
Royal Soc |
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Summary Language |
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Series Issue |
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Edition |
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| ISSN |
1744-9561 |
ISBN |
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| Notes |
ISI:000290515100044 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
317 |
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| Author |
Bremaud, I.; Amusant, N.; Minato, K.; Gril, J.; Thibaut, B. |
| Title |
Effect of extractives on vibrational properties of African Padauk (Pterocarpus soyauxii Taub.) |
Type |
Journal Article |
| Year |
2011 |
Publication |
Wood Science and Technology |
Abbreviated Journal |
Wood Sci. Technol. |
| Volume |
45 |
Issue |
3 |
Pages |
461-472 |
| Keywords |
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| Abstract |
Extractives can affect the vibrational properties tan delta (damping coefficient) and E'/rho (specific Young's modulus), but this is highly dependent on species, compounds, and cellular locations. This paper investigates such effects for African Padauk (Pterocarpus soyauxii Taub.), a tropical hardwood with high extractives content and a preferred material for xylophones. Five groups of 26 heartwood specimens with large, yet comparable, ranges in vibrational properties were extracted in different solvents. Changes in vibrational properties were set against yields of extracts and evaluation of their cellular location. Methanol (ME) reached most of the compounds (13%), located about half in lumen and half in cell-wall. Water solubility was extremely low. tan delta and E'/rho were very strongly related (R (2) a parts per thousand yen 0.93), but native wood had abnormally low values of tan delta, while extraction shifted this relation towards higher tan delta values. ME extracted heartwood became in agreement with the average of many species, and close to sapwood. Extractions increased tan delta as much as 60%, irrespective of minute moisture changes or initial properties. Apparent E'/rho was barely changed (+2% to -4%) but, after correcting the mass contribution of extracts, it was in fact slightly reduced (down to -10% for high E'/rho), and increasingly so for specimens with low initial values of E'/rho. |
| Address |
[Bremaud, I; Minato, K] Kyoto Prefectural Univ, Lab Forest Resource Circulating Circles, Grad Sch Life & Environm Sci, Kyoto 6068522, Japan, Email: iris_bremaud@hotmail.com |
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| Publisher |
Springer |
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Series Issue |
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Edition |
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| ISSN |
0043-7719 |
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| Notes |
WOS:000292550700005 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
329 |
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| Author |
Odonne, G.; Berger, F.; Stien, D.; Grenand, P.; Bourdy, G. |
| Title |
Treatment of leishmaniasis in the Oyapock basin (French Guiana): A K.A.P. survey and analysis of the evolution of phytotherapy knowledge amongst Wayãpi Indians |
Type |
Journal Article |
| Year |
2011 |
Publication |
Journal of Ethnopharmacology |
Abbreviated Journal |
J. Ethnopharmacol. |
| Volume |
137 |
Issue |
3 |
Pages |
1228-1239 |
| Keywords |
Camopi River; French Guiana; Intercultural exchanges; K.A.P.; Knowledge attitude and practices; Knowledge evolution; Leishmaniasis; Oyapock River; Quantitative ethnopharmacology; Teko; Traditional remedies; Wayãpi |
| Abstract |
Ethnopharmacological relevance: Cutaneous leishmaniasis is a neglected disease with a high incidence in French Guiana, mainly in the middle and upper Oyapock basin, where Amerindian and some Brazilian people live. The main goals of this work were (i) to assess the knowledge about leishmaniasis in the different populations of the middle and upper Oyapock basin, (ii) to study the therapeutic strategies adopted by people affected by leishmaniasis and (iii) to document the use of phytotherapeutic remedies for leishmaniasis. Knowledge, attitudes and practices (K.A.P.) related to this disease and its treatments have been studied according to cultural group and geographical settlement. Within the Wayãpi group, the evolution of the knowledge of phytoremedies over the last 20 years has been characterised by literature-based comparisons. Materials and methods: A total of 144 questionnaires were administered in all the villages of the upper Oyapock and Camopi basins. Correspondence analyses were used for multivariate analysis. Plant species were identified at the Cayenne Herbarium (CAY). Results: The biomedical concept of leishmaniasis correlates well with the Teko and Wayãpi concepts of kalasapa and kalasapau. Although the vector of this disease was not correctly identified, the most commonly cited aetiology (74.5%) was vector-borne, and related epidemiological schemes correlate well with the one encountered in French Guiana. Theoretically and practically, health centres were the most commonly used resource for diagnostic in instances of leishmaniasis infection (65.9%), independently of the patient's cultural group, along with the use of pharmaceutical drugs (85.3%). Pharmaceuticals were commonly utilised despite the frequent (51.5%) use of phytotherapeutic remedies, alone or in combination with drugs. The most cited medicinal plant species for the treatment of leishmaniasis included Eleutherine bulbosa (Mill.) Urb. (Iridaceae, cited 14 times), Euterpe oleracea Mart. (Arecaceae, 9), Cecropia obtusa Trecul (Cecropiaceae, 8), Jatropha curcas L. (Euphorbiaceae, 7), Ceiba pentandra (L.) Gaertn. (Bombacaceae, 6) and Carica papaya L. (Caricaceae, 6). Multiple correspondence analyses demonstrated that the species used in leishmaniasis remedies are more prone to vary by the user's place of residence than by their cultural origin, which indicates that exchange of knowledge about leishmaniasis remedies has occurred across different cultural groups. Literature-based comparisons between the remedies for leishmaniasis used by the Wayãpi during the 1980s showed a striking evolution, both in terms of diversity of species and number of plants used. The large number of species shared with other Guianese groups argues for intercultural exchange and may explain the majority (57.1%) of the newly used species highlighted in our study. Conclusions: Leishmaniasis is a well-known disease in the studied area. Phytotherapeutic treatments are still in use, although they are not the main source of remedies, and should undergo pharmacological studies to evaluate their potential therapeutic value. © 2011 Elsevier Ireland Ltd. All rights reserved. |
| Address |
IRD, UMR152, F-31062 Toulouse Cedex 9, France |
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Edition |
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03788741 (Issn) |
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| Notes |
Export Date: 8 November 2011; Source: Scopus; Article in Press; Coden: Joetd; doi: 10.1016/j.jep.2011.07.044; Language of Original Document: English; Correspondence Address: Odonne, G.; CNRS-UMR Ecofog, Université des Antilles et de la Guyane, 97337 Cayenne Cedex, Franceemail: guillaume.odonne@gmail.com |
Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
368 |
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| Author |
Gibernau, M.; Orivel, J.; Delabie, J.H.C.; Barabe, D.; Dejean, A. |
| Title |
An asymmetrical relationship between an arboreal ponerine ant and a trash-basket epiphyte (Araceae) RID D-4390-2009 RID C-4034-2011 |
Type |
Journal Article |
| Year |
2007 |
Publication |
Biological Journal of the Linnean Society |
Abbreviated Journal |
Biol. J. Linnean Soc. |
| Volume |
91 |
Issue |
3 |
Pages |
341-346 |
| Keywords |
hanging soil; mutualism; nest site selection; plant protection |
| Abstract |
The relationship between ants and Philodendron insigne, a trash-basket epiphyte abundant along streams, was studied in French Guiana. Only a few (3%) of the young plants sheltered ants, whereas 90% of the mature individuals did. The most frequent associate was Odontomachus hastatus (Fabricius), an arboreal ponerine ant, and its nests were almost entirely (94.4%) located in P. insigne root clusters. Experimental choice tests conducted on O. hastatus workers confirmed their preference for P. insigne. We propose that the interactions between P. insigne and ants may be intermediate between non-obligatory, reward-based interactions and obligatory, specific ant-myrmecophyte interactions because (1) almost all mature P. insigne individuals are associated with ants; (2) O. hastatus is the most frequent when diverse ants nest in its root clusters; (3) ants colonize mature P. insigne, but rarely young individuals; (4) ants, particularly O. hastatus, protect the foliage of their host; and (5) at least one ant species, O. hastatus, prefers P. insigne over other host plants. The latter relationship is asymmetrical because P. insigne is inhabited by diverse ants whereas O. hastatus nests almost exclusively in P. insigne. (c) 2007 The Linnean Society of London, Biological Journal of the Linnean Society, 2007, 91, 341-346. |
| Address |
Univ Toulouse 3, Lab Evolut & Divers Biol, UMR 5174, CNRS,UPS, F-31062 Toulouse 9, France, Email: dejean@cict.fr |
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| Publisher |
Blackwell Publishing |
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Editor |
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| Language |
English |
Summary Language |
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Edition |
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| ISSN |
0024-4066 |
ISBN |
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| Notes |
WOS:000247817100001 |
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no |
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EcoFoG @ webmaster @ |
Serial |
356 |
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