| Records |
| Author |
Melieres, M.A.; Pourchet, M.; Charles-Dominique, P.; Gaucher, P. |
| Title |
Mercury in canopy leaves of French Guiana in remote areas |
Type |
Journal Article |
| Year |
2003 |
Publication |
Science of the Total Environment |
Abbreviated Journal |
Sci. Total Environ. |
| Volume |
311 |
Issue |
1-3 |
Pages  |
261-267 |
| Keywords |
mercury; canopy; rainforest; Hg atmosphere soil transfer |
| Abstract |
A study of total Hg concentration in the foliage of the canopy was carried out in two remote areas in French Guiana. The sampled canopy is representative of the French Guiana canopy. The concentration in the foliage, 64+/-14 ng g(-1) (dry wt.), is used to estimate the annual input of total Hg to the soil through the litterfall, found to be 45+/-10 mug m(-2) y(-1). As translocation is negligible, mercury in the canopy originates mainly from atmospheric uptake by the leaves and this litterfall deposit represents a direct atmospheric input from the background atmospheric load into the soil. (C) 2003 Elsevier Science B.V. All rights reserved. |
| Address |
Univ Grenoble 1, CNRS, Lab Glaciol & Geophys Environm, F-38402 St Martin Dheres, France, Email: melieres@glaciog.ujf-grenobic.fr |
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| Publisher |
ELSEVIER SCIENCE BV |
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Series Issue |
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Edition |
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| ISSN |
0048-9697 |
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| Notes |
ISI:000184091300019 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
271 |
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| Author |
Bourguignon, T.; Sobotnik, J.; Lepoint, G.; Martin, J.M.; Hardy, O.J.; Dejean, A.; Roisin, Y. |
| Title |
Feeding ecology and phylogenetic structure of a complex neotropical termite assemblage, revealed by nitrogen stable isotope ratios |
Type |
Journal Article |
| Year |
2011 |
Publication |
Ecological Entomology |
Abbreviated Journal |
Ecol. Entomol. |
| Volume |
36 |
Issue |
2 |
Pages |
261-269 |
| Keywords |
Diet diversity; feeding groups; Isoptera; phylogenetic autocorrelation |
| Abstract |
2. Nitrogen stable isotopes (hereafter delta 15N) were used to place termites from French Guiana rainforests along a wood-soil decomposition gradient, to test (i) whether feeding group assignation based on morphological characters was accurate and actually represented diet specialisation thresholds, and (ii) to what extent the dietary specialization of species is explained by phylogeny (phylogenetic autocorrelation). 3. delta 15N values vary over a range of 13 parts per thousand, suggesting that diet diversification contributes to the high species diversity in French Guiana. delta 15N values span a similar interval in all Termitidae subfamilies. Ranges of different subfamilies broadly overlap, although each of them diversified preferentially on one side of the wood-soil decomposition gradient. Congeneric species share similar feeding habits, whereas distant species tend to feed on distinct substrates. 4. Feeding groups did not completely match stable isotope data: there was no discontinuity between Groups III and IV, and no correlation between anatomical criteria used to distinguish these groups and delta 15N values. Nor was there any consistent difference in delta 15N values between wood feeders of the families Rhinotermitidae (Group I) and Termitidae (Group II). We also suggest that species feeding outside the wood-soil gradient should be distinguished for their peculiar feeding requirements. |
| Address |
[Sobotnik, Jan] Acad Sci Czech Republic, Inst Organ Chem & Biochem, Res Team Infochem, CR-16610 Prague 6, Czech Republic, Email: sobotnik@uochb.cas.cz |
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| Publisher |
Wiley-Blackwell |
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Edition |
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| ISSN |
0307-6946 |
ISBN |
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| Notes |
ISI:000288456300016 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
302 |
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| Author |
Brendel, O.; Le Thiec, D.; Scotti-Saintagne, C.; Bodenes, C.; Kremer, A.; Guehl, J.M. |
| Title |
Quantitative trait loci controlling water use efficiency and related traits in Quercus robur L |
Type |
Journal Article |
| Year |
2008 |
Publication |
Tree Genetics & Genomes |
Abbreviated Journal |
Tree Genet. Genomes |
| Volume |
4 |
Issue |
2 |
Pages |
263-278 |
| Keywords |
Quercus robur; carbon isotope composition; delta C-13; water use efficiency; QTL |
| Abstract |
Genetic variation for intrinsic water use efficiency (W-i) and related traits was estimated in a full-sib family of Quercus robur L. over 3 years. The genetic linkage map available for this F1 family was used to locate quantitative trait loci (QTL) for W-i, as estimated by leaf carbon stable isotope composition (delta C-13) or the ratio of net CO2 assimilation rate (A) to stomatal conductance to water vapour (g(w)) and related leaf traits. Gas exchange measurements were used to standardize estimates of A and g(w) and to model the sensitivity of gw to leaf-to-air vapour pressure deficit (sg(VPD)). delta C-13 varied by more than 3% among the siblings, which is equivalent to 40% variation of W-i. Most of the studied traits exhibited high clonal mean repeat-abilities (> 50%; proportion of clonal mean variability in global variance). Repeatabilities for delta C-13, leaf mass per area (LMA) and leaf nitrogen content were higher than 70%. For delta C-13, ten QTLs were detected, one of which was detected repeatedly for all 3 years and consistently explained more than 20% of measured variance. Four genomic regions were found in which co-localizing traits linked variation in W-i to variations in leaf chlorophyll and nitrogen content, LMA and sg(VPD). A positive correlation using clonal means between delta C-13 and A/g(w), as well as a co-localisation of QTL detected for both traits, can be seen as validation of the theoretical model linking the genetic architecture of these two traits. |
| Address |
[Brendel, Oliver; Le Thiec, Didier; Guehl, Jean-Marc] Ctr INRA Nancy, UMR INRA UHP 1137, F-54280 Seichamps, France, Email: brendel@nancy.inra.fr |
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| Publisher |
SPRINGER HEIDELBERG |
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Series Issue |
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Edition |
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| ISSN |
1614-2942 |
ISBN |
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| Notes |
ISI:000253091100013 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
143 |
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| Author |
Salas-Lopez, A.; Talaga, S.; Lalague, H. |
| Title |
The discovery of devil's gardens: An ant-plant mutualism in the cloud forests of the Eastern Amazon |
Type |
Journal Article |
| Year |
2016 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
Journal of Tropical Ecology |
| Volume |
32 |
Issue |
3 |
Pages |
264-268 |
| Keywords |
ant-plant interactions; biogeography; cloud forest; Cordia nodosa; mutualism, Myrmelachista; refuge hypothesis |
| Abstract |
Devil's gardens are one of the most remarkable mutualistic associations between ants and plants. Myrmelachista ants eliminate all vegetation from around their host plants, resulting in wide forest clearings which have intrigued scientists from the start. Despite their noticeability, here we report the discovery of devil's gardens in remote highland cloud forests of the Eastern Amazon, more than 2000 km away from their nearest known analogues in Western Amazonia. We describe the ecological characteristics of these gardens and consider what factors could have produced the geographic isolation of Eastern Amazonian devil's gardens. Three hypotheses are investigated: (1) the host plant distribution restricts the distribution of the mutualism, (2) the ecological tolerances of Myrmelachista explain the isolation, and (3) the devil's gardens of the Eastern Amazon constitute relicts from ancient forest refugia. The distribution of the possible associated myrmecophytes and previously described ecological ranges of devil's gardens cannot explain their ecological restriction to cloud forests in Eastern Amazonia, but our discovery is consistent with the biogeographic refuge hypothesis (i.e. highlands along the Amazon Basin constitute refugia for humid forests that spread during the Cenozoic). Our finding opens exciting perspectives for comparative studies of the origin, ecology and evolutionary history of this ant-plant mutualism. Copyright © Cambridge University Press 2016. |
| Address |
INRA, UMR, EcoFoG, Campus Agronomique, BP 316, Kourou Cedex, France |
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| Notes |
Export Date: 1 September 2016 |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
691 |
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| Author |
Dejean, A.; Carpenter, J.M.; Corbara, B.; Wright, P.; Roux, O.; LaPierre, L.M. |
| Title |
The hunter becomes the hunted: When cleptobiotic insects are captured by their target ants |
Type |
Journal Article |
| Year |
2012 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
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| Volume |
99 |
Issue |
4 |
Pages |
265-273 |
| Keywords |
Ant predation; Cleptobiosis; Flies and Reduviidae; Myrmecophyte; Social wasps; Stingless bees |
| Abstract |
Here we show that trying to rob prey (cleptobiosis) from a highly specialized predatory ant species is risky. To capture prey, Allomerus decemarticulatus workers build gallery-shaped traps on the stems of their associated myrmecophyte, Hirtella physophora. We wondered whether the frequent presence of immobilized prey on the trap attracted flying cleptoparasites. Nine social wasp species nest in the H. physophora foliage; of the six species studied, only Angiopolybia pallens rob prey from Allomerus colonies. For those H. physophora not sheltering wasps, we noted cleptobiosis by stingless bees (Trigona), social wasps (A. pallens and five Agelaia species), assassin bugs (Reduviidae), and flies. A relationship between the size of the robbers and their rate of capture by ambushing Allomerus workers was established for social wasps; small wasps were easily captured, while the largest never were. Reduviids, which are slow to extract their rostrum from prey, were always captured, while Trigona and flies often escaped. The balance sheet for the ants was positive vis-à-vis the reduviids and four out of the six social wasp species. For the latter, wasps began by cutting up parts of the prey's abdomen and were captured (or abandoned the prey) before the entire abdomen was retrieved so that the total weight of the captured wasps exceeded that of the prey abdomens. For A. pallens, we show that the number of individuals captured during attempts at cleptobiosis increases with the size of the Allomerus' prey. © Springer-Verlag 2012. |
| Address |
Department of Biology, Lower Columbia College, 1600 Maple St., Longview, WA 98632, United States |
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| Notes |
Cited By (since 1996): 1; Export Date: 16 January 2013; Source: Scopus |
Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
458 |
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| Author |
Fortunel, C.; Violle, C.; Rourmet, C.; Buatois, B.; Navas, M.L.; Garnier, E. |
| Title |
Allocation strategies and seed traits are hardly affected by nitrogen supply in 18 species differing in successional status |
Type |
Journal Article |
| Year |
2009 |
Publication |
Perspectives in Plant Ecology Evolution and Systematics |
Abbreviated Journal |
Perspect. Plant Ecol. Evol. Syst. |
| Volume |
11 |
Issue |
4 |
Pages |
267-283 |
| Keywords |
Allometry; Reproductive output; Seed mass; Nitrogen concentration of organs; Succession; Nitrogen supply |
| Abstract |
Species performance depends on ecological strategies, revealed by suites of traits, conferring different relative ecological advantages in different environments. Although current knowledge on plant strategies along successional gradients is derived from studies conducted in situ, actually quantifying these strategies requires disentangling the effects of environmental factors from intrinsic differences between species. Here we tested whether allocation strategies and seed traits differ among successional stages and nitrogen levels. To this aim, we assessed biomass and nitrogen allocations and seed traits variations for 18 species, differing in life history and belonging to three stages of a Mediterranean old-field succession. These species were grown as monocultures in an experimental garden under limiting and non-limiting nitrogen supply. Early successional species allocated allometrically more nitrogen and proportionally more biomass to reproduction, and set more seeds than later successional species. Seed mass increased with successional status and was negatively related to seed number. Early successional species thus produced more but less-provisioned seeds, suggesting better colonization abilities. These patterns were not the sole consequence of the replacement of annuals by perennials along the successional gradient, since comparable trends were also observed within each life history. Allocation patterns were generally not altered by nitrogen supply and the higher nitrogen content in vegetative organs of plants grown under high nitrogen supply was not retranslocated from leaves to seeds during seed development. We therefore conclude that differences in plant ecological strategies in species characteristics from contrasting successional stages appear to be intrinsic properties of the studied species, and independent from environmental conditions. (c) 2009 Rubel Foundation, ETH Zurich. Published by Elsevier GmbH. All rights reserved. |
| Address |
[Fortunel, Claire; Violle, Cyrille; Rourmet, Catherine; Buatois, Bruno; Garnier, Eric] Ctr Ecol Fonct & Evolut, CNRS, UMR 5175, F-34293 Montpellier 5, France, Email: claire.fortunel@ecofog.gf |
| Corporate Author |
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Thesis |
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| Publisher |
ELSEVIER GMBH, URBAN & FISCHER VERLAG |
Place of Publication |
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Summary Language |
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Original Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
1433-8319 |
ISBN |
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Medium |
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| Notes |
ISI:000271799900003 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
93 |
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| Author |
Rodríguez Pérez, H.; Borrel, G.; Leroy, C.; Carrias, J.-F.; Corbara, B.; Srivastava, D.S.; Céréghino, R. |
| Title |
Simulated drought regimes reveal community resilience and hydrological thresholds for altered decomposition |
Type |
Journal Article |
| Year |
2018 |
Publication |
Oecologia |
Abbreviated Journal |
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| Volume |
187 |
Issue |
1 |
Pages |
267-279 |
| Keywords |
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| Abstract |
Future climate scenarios forecast a 10–50% decline in rainfall in Eastern Amazonia. Altered precipitation patterns may change important ecosystem functions like decomposition through either changes in physical and chemical processes or shifts in the activity and/or composition of species. We experimentally manipulated hydroperiods (length of wet:dry cycles) in a tank bromeliad ecosystem to examine impacts on leaf litter decomposition. Gross loss of litter mass over 112 days was greatest in continuously submersed litter, lowest in continuously dry litter, and intermediate over a range of hydroperiods ranging from eight cycles of 7 wet:7 dry days to one cycle of 56 wet:56 dry days. The resilience of litter mass loss to hydroperiod length is due to a shift from biologically assisted decomposition (mostly microbial) at short wet:dry hydroperiods to physicochemical release of dissolved organic matter at longer wet:dry hydroperiods. Biologically assisted decomposition was maximized at wet:dry hydroperiods falling within the range of ambient conditions (12–22 consecutive dry days) but then declined under prolonged wet:dry hydroperiods (28 and 56 dry days. Fungal:bacterial ratios showed a similar pattern as biologically assisted decomposition to hydroperiod length. Our results suggest that microbial communities confer functional resilience to altered hydroperiod in tank bromeliad ecosystems. We predict a substantial decrease in biological activity relevant to decomposition under climate scenarios that increase consecutive dry days by 1.6- to 3.2-fold in our study area, whereas decreased frequency of dry periods will tend to increase the physicochemical component of decomposition. |
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Edition |
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| ISSN |
1432-1939 |
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no |
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EcoFoG @ webmaster @ Rodríguez Pérez2018 |
Serial |
850 |
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| Author |
Guitet, S.; Sabatier, D.; Brunaux, O.; Herault, B.; Aubry-Kientz, M.; Molino, J.-F.; Baraloto, C. |
| Title |
Estimating tropical tree diversity indices from forestry surveys: A method to integrate taxonomic uncertainty |
Type |
Journal Article |
| Year |
2014 |
Publication |
Forest Ecology and Management |
Abbreviated Journal |
For. Ecol. Manage. |
| Volume |
328 |
Issue |
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Pages |
270-281 |
| Keywords |
Diversity; French guiana; Landscape scale; Monte-Carlo process; Rainforest; Tree community; Reliability; Surveys; Timber; Uncertainty analysis; Diversity; French Guiana; Landscape scale; Rainforest; Tree community; Forestry; estimation method; forest inventory; herbarium; landscape; numerical model; species diversity; taxonomy; uncertainty analysis; Forestry; Forests; Reliability; Surveys; French Guiana |
| Abstract |
Analyses of tree diversity and community composition in tropical rain forests are usually based either on general herbarium data or on a restricted number of botanical plots. Despite their high taxonomic accuracy, both types of data are difficult to extrapolate to landscape scales. Meanwhile, forestry surveys provide quantitative occurrence data on large areas, and are thus increasingly used for landscape-scale analyses of tree diversity. However, the reliability of these approaches has been challenged because of the ambiguity of the common (vernacular) names used by foresters and the complexity of tree taxonomy in those hyper-diverse communities.We developed and tested a novel approach to evaluate taxonomic reliability of forestry surveys and to propagate the resulting uncertainty in the estimates of several diversity indicators (alpha and beta entropy, Fisher-alpha and Sørensen similarity). Our approach is based on Monte-Carlo processes that simulate communities by taking into account the expected accuracy and reliability of common names. We tested this method in French Guiana, on 9 one-hectare plots (4279 trees – DBH. ≥. 10. cm) for which both common names and standardized taxonomic determinations were available. We then applied our method of community simulation on large forestry inventories (560. ha) at the landscape scale and compared the diversity indices obtained for 10 sites with those computed from precise botanical determination situated at the same localities.We found that taxonomic reliability of forestry inventories varied from 22% (species level) to 83% (family level) in this Amazonian region. Indices computed directly with raw forestry data resulted in incorrect values, except for Gini-Simpson beta-diversity. On the contrary, our correction method provides more accurate diversity estimates, highly correlated with botanical measurements, for almost all diversity indices at both regional and local scales. We obtained a robust ranking of sites consistent with those shown by botanical inventories.These results show that (i) forestry inventories represent a significant part of taxonomic information, (ii) the relative diversity of regional sites can be successfully ranked using forestry inventory data using our method and (iii) forestry inventories can valuably contribute to the detection of large-scale diversity patterns when biases are well-controlled and corrected.The tools we developed as R-functions are available in supplementary material and can be adapted with local parameters to be used for forest management and conservation issues in other regional contexts. © 2014 Elsevier B.V. |
| Address |
INRA, UMR EcoFoG, 97387 Kourou Cedex, French Guiana |
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| Publisher |
Elsevier |
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Edition |
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03781127 (Issn) |
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| Notes |
Export Date: 30 July 2014; Coden: Fecmd; Correspondence Address: Guitet, S.; INRA, UMR Amap, TA A51/PS2, 34398 Montpellier Cedex 5, France; email: stephane.guitet@cirad.fr |
Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
552 |
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| Author |
Coq, S.; Weigel, J.; Butenschoen, O.; Bonal, D.; Hattenschwiler, S. |
| Title |
Litter composition rather than plant presence affects decomposition of tropical litter mixtures |
Type |
Journal Article |
| Year |
2011 |
Publication |
Plant and Soil |
Abbreviated Journal |
Plant Soil |
| Volume |
343 |
Issue |
1-2 |
Pages |
273-286 |
| Keywords |
Amazonian lowland rainforest; Belowground/aboveground interactions; Litter decomposition; Non-additive effect; Nitrogen dynamic; Plant-soil feedback |
| Abstract |
Litter decomposition is strongly controlled by litter quality, but the composition of litter mixtures and potential interactions with live plants through root activity may also influence decomposers. In a greenhouse experiment in French Guiana we studied the combined effects of the presence of tropical tree seedlings and of distinct litter composition on mass and nitrogen (N) loss from decomposing litter and on microbial biomass. Different litter mixtures decomposed for 435 days in pots filled with sand and containing an individual seedling from one of four different tree species. We found both additive and negative non-additive effects (NAE) of litter mixing on mass loss, whereas N loss showed negative and positive NAE of litter mixing. If litter from the two tree species, Platonia insignis and Goupia glabra were present, litter mixtures showed more positive and more negative NAE on N loss, respectively. Overall, decomposition, and in particular non-additive effects, were only weakly affected by the presence of tree seedlings. Litter mass loss weakly yet significantly decreased with increasing fine root biomass in presence of Goupia seedlings, but not in the presence of seedlings of any other tree species. Our results showed strong litter composition effects and also clear, mostly negative, non-additive effects on mass loss and N loss. Species identity of tree seedlings can modify litter decomposition, but these live plant effects remain quantitatively inferior to litter composition effects. |
| Address |
[Coq, Sylvain; Haettenschwiler, Stephan] CNRS, CEFE, F-34293 Montpellier 5, France, Email: sylvain.coq@gmail.com |
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Springer |
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Summary Language |
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| ISSN |
0032-079x |
ISBN |
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| Notes |
ISI:000290688000020 |
Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
320 |
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| Author |
Veron, V.; Caron, H.; Degen, B. |
| Title |
Gene flow and mating system of the tropical tree Sextonia rubra |
Type |
Journal Article |
| Year |
2005 |
Publication |
Silvae Genetica |
Abbreviated Journal |
Silvae Genet. |
| Volume |
54 |
Issue |
6 |
Pages |
275-280 |
| Keywords |
genetic diversity; gene flow; heterozygosity; microsatellites; mixed mating; tropical tree; twogener |
| Abstract |
In this paper we report a study of the mating system and gene flow of Sextonia rubra, a hermaphroditic, insect pollinated tropical tree species with a geographic distribution in the Guyana Plateau and the Amazon. Using five microsatellites we analysed 428 seeds of 27 open pollinated families at the experimental site “Paracou” in French Guiana. We observed, compared to other tropical tree species, a high level of genetic diversity. We estimated parameters of the mating system and gene flow by using the mixed mating model and the TwoGener approach. The estimated multilocus outcrossing rate, t(m), was 0.992 indicating nearly complete outcrossing. A significant level of biparental inbreeding and a:small proportion. of full-sibs were estimated for the 27 seed arrays. The differentiation of allelic frequencies among the pollen pools was (Phi(FT) = 0.061. We estimated mean pollen dispersal distances between 65 m and 89 m according to the dispersal models used. The joint estimation of pollen dispersal and density of reproductive trees gave an effective density estimate of 2.1-2.2 trees/ha. |
| Address |
INRA, UMR, ECOFOG, Kourou 9738, French Guiana, Email: b.degen@holz.uni-hamburg.de |
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| Publisher |
J D SAUERLANDERS VERLAG |
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0037-5349 |
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| Notes |
ISI:000235239400005 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
182 |
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