| Records |
| Author |
Gloor, M.; Phillips, O.L.; Lloyd, J.J.; Lewis, S.L.; Malhi, Y.; Baker, T.R.; Lopez-Gonzalez, G.; Peacock, J.; Almeida, S.; de Oliveira, A.C.A.; Alvarez, E.; Amaral, I.; Arroyo, L.; Aymard, G.; Banki, O.; Blanc, L.; Bonal, D.; Brando, P.; Chao, K.J.; Chave, J.; Davila, N.; Erwin, T.; Silva, J.; Di Fiore, A.; Feldpausch, T.R.; Freitas, A.; Herrera, R.; Higuchi, N.; Honorio, E.; Jimenez, E.; Killeen, T.; Laurance, W.; Mendoza, C.; Monteagudo, A.; Andrade, A.; Neill, D.; Nepstad, D.; Vargas, P.N.; Penuela, M.C.; Cruz, A.P.; Prieto, A.; Pitman, N.; Quesada, C.; Salomao, R.; Silveira, M.; Schwarz, M.; Stropp, J.; Ramirez, F.; Ramirez, H.; Rudas, A.; ter Steege, H.; Silva, N.; Torres, A.; Terborgh, J.; Vasquez, R.; van der Heijden, G. |
| Title |
Does the disturbance hypothesis explain the biomass increase in basin-wide Amazon forest plot data? |
Type |
Journal Article |
| Year |
2009 |
Publication |
Global Change Biology |
Abbreviated Journal |
Glob. Change Biol. |
| Volume |
15 |
Issue |
10 |
Pages |
2418-2430 |
| Keywords |
Amazon rainforest; carbon sink; disturbance; mortality; power law |
| Abstract |
Positive aboveground biomass trends have been reported from old-growth forests across the Amazon basin and hypothesized to reflect a large-scale response to exterior forcing. The result could, however, be an artefact due to a sampling bias induced by the nature of forest growth dynamics. Here, we characterize statistically the disturbance process in Amazon old-growth forests as recorded in 135 forest plots of the RAINFOR network up to 2006, and other independent research programmes, and explore the consequences of sampling artefacts using a data-based stochastic simulator. Over the observed range of annual aboveground biomass losses, standard statistical tests show that the distribution of biomass losses through mortality follow an exponential or near-identical Weibull probability distribution and not a power law as assumed by others. The simulator was parameterized using both an exponential disturbance probability distribution as well as a mixed exponential-power law distribution to account for potential large-scale blowdown events. In both cases, sampling biases turn out to be too small to explain the gains detected by the extended RAINFOR plot network. This result lends further support to the notion that currently observed biomass gains for intact forests across the Amazon are actually occurring over large scales at the current time, presumably as a response to climate change. |
| Address |
[Gloor, M.; Phillips, O. L.; Lloyd, J. J.; Lewis, S. L.; Baker, T. R.; Lopez-Gonzalez, G.; Peacock, J.; Feldpausch, T. R.] Univ Leeds, Sch Geog, Leeds LS2 9JT, W Yorkshire, England, Email: eugloor@googlemail.com |
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| Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
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Series Issue |
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Edition |
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| ISSN |
1354-1013 |
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Expedition |
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Conference |
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Notes  |
ISI:000269577800006 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
196 |
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| Author |
Seymour, R.S.; White, C.R.; Gibernau, M. |
| Title |
Endothermy of dynastine scarab beetles (Cyclocephala colasi) associated with pollination biology of a thermogenic arum lily (Philodendron solimoesense) |
Type |
Journal Article |
| Year |
2009 |
Publication |
Journal of Experimental Biology |
Abbreviated Journal |
J. Exp. Biol. |
| Volume |
212 |
Issue |
18 |
Pages |
2960-2968 |
| Keywords |
beetle; endothermy; pollination biology; Cyclocephala; Philodendron |
| Abstract |
Cyclocephala colasi beetles are facultative endotherms that spend most of their adult lives inside the inflorescences of Philodendron solimoesense, where ambient temperature (T-a) averages about 28 degrees C due to floral thermogenesis. Measurements of respiration within a range of T-a showed that active beetles became spontaneously endothermic at T-a below 28 degrees C but were rarely endothermic above it. There was no evidence of endothermy within the inflorescences, indicating that activities in the floral chamber can occur without the high energy expense of endothermy. Bouts of endothermy occurred at lower T-a in respirometer chambers mainly in the evening, when the insects normally fly from one inflorescence to another, and during the night, when they normally eat and mate within the inflorescence. Patterns of endothermy in individual episodes were studied in non-flying beetles with respirometry and infrared thermal imaging. Heat was generated in the thorax by oscillatory waves of respiration that were coupled with thoracic temperature (T-th) increases. Stationary beetles could regulate T-th at about 33 degrees C independently of T-a between 16 and 29 degrees C. At T-a=20 degrees C, this represents a 116-fold increase in metabolic rate over resting, ectothermic values. Endothermy was clearly a requirement for flight, and beetles departing inflorescences warmed to about 30 degrees C before take-off. During flight, T-th was dependent on T-a, decreasing from 37 to 28 degrees C at T-a of 37 to 20 degrees C, respectively. The lowest T-a at which flight could occur was about 20 degrees C. Thermal conductance of stationary, endothermic beetles increased at higher metabolic rates, probably because of increased ventilatory heat loss. |
| Address |
[Seymour, Roger S.] Univ Adelaide, Sch Earth & Environm Sci, Adelaide, SA 5005, Australia, Email: roger.seymour@adelaide.edu.au |
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Thesis |
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| Publisher |
COMPANY OF BIOLOGISTS LTD |
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| ISSN |
0022-0949 |
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| Notes |
ISI:000269383500014 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
198 |
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| Author |
Campillo, F.; Rakotozafy, R.; Rossi, V. |
| Title |
Parallel and interacting Markov chain Monte Carlo algorithm |
Type |
Journal Article |
| Year |
2009 |
Publication |
Mathematics and Computers in Simulation |
Abbreviated Journal |
Math. Comput. Simul. |
| Volume |
79 |
Issue |
12 |
Pages |
3424-3433 |
| Keywords |
Markov chain Monte Carlo method; Interacting chains; Hidden Markov model |
| Abstract |
In many situations it is important to be able to propose N independent realizations of a given distribution law. We propose a strategy for making N parallel Monte Carlo Markov chains (MCMC) interact in order to get an approximation of an independent N-sample of a given target law. In this method each individual chain proposes candidates for all other chains. We prove that the set of interacting chains is itself a MCMC method for the product of N target measures. Compared to independent parallel chains this method is more time consuming. but we show through examples that it possesses many advantages. This approach is applied to a biomass evolution model. (C) 2009 IMACS. Published by Elsevier B.V. All rights reserved. |
| Address |
[Rossi, Vivien] CIRAD, Res Unit, Montpellier, France, Email: Fabien.Campillo@inria.fr |
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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 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 |
0378-4754 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
ISI:000269289100006 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
197 |
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| Author |
Blanc, L.; Echard, M.; Herault, B.; Bonal, D.; Marcon, E.; Chave, J.; Baraloto, C. |
| Title |
Dynamics of aboveground carbon stocks in a selectively logged tropical forest |
Type |
Journal Article |
| Year |
2009 |
Publication |
Ecological Applications |
Abbreviated Journal |
Ecol. Appl. |
| Volume |
19 |
Issue |
6 |
Pages |
1397-1404 |
| Keywords |
aboveground biomass; carbon sequestration; deforestation; French Guiana; global change; timber stand improvement; tropical forests |
| Abstract |
The expansion of selective logging in tropical forests may be an important source of global carbon emissions. However, the effects of logging practices on the carbon cycle have never been quantified over long periods of time. We followed the fate of more than 60 000 tropical trees over 23 years to assess changes in aboveground carbon stocks in 48 1.56-ha plots in French Guiana that represent a gradient of timber harvest intensities, with and without intensive timber stand improvement (TSI) treatments to stimulate timber tree growth. Conventional selective logging led to emissions equivalent to more than a third of aboveground carbon stocks in plots without TSI (85 Mg C/ha), while plots with TSI lost more than one-half of aboveground carbon stocks (142 Mg C/ha). Within 20 years of logging, plots without TSI sequestered aboveground carbon equivalent to more than 80% of aboveground carbon lost to logging (-70.7 Mg C/ha), and our simulations predicted an equilibrium aboveground carbon balance within 45 years of logging. In contrast, plots with intensive TSI are predicted to require more than 100 years to sequester aboveground carbon lost to emissions. These results indicate that in some tropical forests aboveground carbon storage can be recovered within half a century after conventional logging at moderate harvest intensities. |
| Address |
[Bonal, Damien; Baraloto, Christopher] INRA, UMR Ecol Forets Guyane, Kourou 97379, French Guiana, Email: chris.baraloto@ecofog.gf |
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Thesis |
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| Publisher |
ECOLOGICAL SOC AMER |
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 |
1051-0761 |
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:000269075200003 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
105 |
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| Author |
Leroy, C.; Sabatier, S.; Wahyuni, N.S.; Barczi, J.F.; Dauzat, J.; Laurans, M.; Auclair, D. |
| Title |
Virtual trees and light capture: a method for optimizing agroforestry stand design |
Type |
Journal Article |
| Year |
2009 |
Publication |
Agroforestry Systems |
Abbreviated Journal |
Agrofor. Syst. |
| Volume |
77 |
Issue |
1 |
Pages |
37-47 |
| Keywords |
Acacia mangium; Tectona grandis; Agroforestry; Light interception; Plant architecture; Simulation; 3D virtual plant |
| Abstract |
In agroforestry systems, the distribution of light transmitted under tree canopies can be a limiting factor for the development of intercrops. The light available for intercrops depends on the quantity of light intercepted by tree canopies and, consequently, on the architecture of the tree species present. The influence of tree architecture on light transmission was analysed using dynamic 3D architectural models. The architectural analysis of Acacia mangium and Tectona grandis was performed in Indonesian agroforestry systems with trees aged from 1 to 3 years. 3D virtual trees were then generated with the AmapSim simulation software and 3D virtual experiments in which tree age, planting density, planting pattern and pruning intensity varied were reconstructed in order to simulate light available for the crop. Canopy closure of trees was more rapid in A. mangium than in T. grandis agroforestry systems; after 3 years the quantity of light available for A. mangium intercrops was three times lower than under T. grandis. Simulations with A. mangium showed that practices such as pruning and widening tree spacing enable to increase the total transmitted light within the stand. On T. grandis, modification of the tree row azimuth resulted in changes in the spatial and seasonal distribution of light available for the intercrops. These results are discussed in terms of agroforestry system management. |
| Address |
[Sabatier, Sylvie; Barczi, Jean-Francois; Dauzat, Jean; Laurans, Marilyne] CIRAD, UMR AMAP Botan & Bioinformat Architecture Plantes, F-34398 Montpellier 5, France, Email: sylvie-annabel.sabatier@cirad.fr |
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Thesis |
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| Publisher |
SPRINGER |
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 |
0167-4366 |
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:000268865600004 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
199 |
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| Author |
Leroy, C.; Corbara, B.; Dejean, A.; Cereghino, R. |
| Title |
Ants mediate foliar structure and nitrogen acquisition in a tank-bromeliad |
Type |
Journal Article |
| Year |
2009 |
Publication |
New Phytologist |
Abbreviated Journal |
New Phytol. |
| Volume |
183 |
Issue |
4 |
Pages |
1124-1133 |
| Keywords |
Aechmea mertensii; antgardens; Camponotus femoratus; foliar structure; delta N-15; Pachycondyla goeldii; phytotelmata contents |
| Abstract |
Aechmea mertensii is a tank-bromeliad that roots on ant-gardens initiated by the ants Camponotus femoratus and Pachycondyla goeldii. Its leaves form compartments acting as phytotelmata that hold rainwater and provide habitats for invertebrates. In this article, we aimed to determine whether the association with either C. femoratus or P. goeldii influenced the vegetative traits of A. mertensii, invertebrate diversity and nutrient assimilation by the leaves. Transmitted light, vegetative traits and phytotelmata contents were compared between the two A. mertensii ant-gardens. Camponotus femoratus colonized partially shaded areas, whereas P. goeldii colonized exposed areas. The bromeliads' rosettes had a large canopy (C. femoratus ant-gardens), or were smaller and amphora shaped (P. goeldii ant-gardens). There were significant differences in leaf anatomy, as shaded leaves were thicker than exposed leaves. The mean volumes of water, fine particulate organic matter and detritus in C. femoratus-associated bromeliads were three to five times higher than in P. goeldii-associated bromeliads. Moreover, the highest invertebrate diversity and leaf delta N-15 values were found in C. femoratus-associated bromeliads. This study enhances our understanding of the dynamics of biodiversity, and shows how ant-plant interactions can have trophic consequences and thus influence the architecture of the interacting plant via a complex feedback loop. |
| Address |
[Leroy, Celine; Dejean, Alain] EcoFoG, CNRS, UMR 8172, F-97379 Kourou, France, Email: Celine.Leroy@ecofog.gf |
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Thesis |
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| Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
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 |
0028-646X |
ISBN |
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| Notes |
ISI:000268855300020 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
106 |
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| Author |
Chang, S.S.; Clair, B.; Ruelle, J.; Beauchene, J.; Di Renzo, F.; Quignard, F.; Zhao, G.J.; Yamamoto, H.; Gril, J. |
| Title |
Mesoporosity as a new parameter for understanding tension stress generation in trees |
Type |
Journal Article |
| Year |
2009 |
Publication |
Journal of Experimental Botany |
Abbreviated Journal |
J. Exp. Bot. |
| Volume |
60 |
Issue |
11 |
Pages |
3023-3030 |
| Keywords |
Growth stress; hydrogel; mesoporosity; tension wood |
| Abstract |
The mechanism for tree orientation in angiosperms is based on the production of high tensile stress on the upper side of the inclined axis. In many species, the stress level is strongly related to the presence of a peculiar layer, called the G-layer, in the fibre cell wall. The structure of the G-layer has recently been described as a hydrogel thanks to N-2 adsorption-desorption isotherms of supercritically dried samples showing a high mesoporosity (pores size from 2-50 nm). This led us to revisit the concept of the G-layer that had been, until now, only described from anatomical observation. Adsorption isotherms of both normal wood and tension wood have been measured on six tropical species. Measurements show that mesoporosity is high in tension wood with a typical thick G-layer while it is much less with a thinner G-layer, sometimes no more than normal wood. The mesoporosity of tension wood species without a G-layer is as low as in normal wood. Not depending on the amount of pores, the pore size distribution is always centred around 6-12 nm. These results suggest that, among species producing fibres with a G-layer, large structural differences of the G-layer exist between species. |
| Address |
[Chang, Shan-Shan; Clair, Bruno; Gril, Joseph] Univ Montpellier 2, LMGC, CNRS, F-34095 Montpellier 5, France, Email: clair@lmgc.univ-montp2.fr |
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| Publisher |
OXFORD UNIV PRESS |
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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 |
0022-0957 |
ISBN |
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Medium |
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Conference |
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| Notes |
ISI:000268588300008 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
107 |
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| Author |
Groc, S.; Orivel, J.; Dejean, A.; Martin, J.M.; Etienne, M.P.; Corbara, B.; Delabie, J.H.C. |
| Title |
Baseline study of the leaf-litter ant fauna in a French Guianese forest |
Type |
Journal Article |
| Year |
2009 |
Publication |
Insect Conservation and Diversity |
Abbreviated Journal |
Insect. Conserv. Divers. |
| Volume |
2 |
Issue |
3 |
Pages |
183-193 |
| Keywords |
Ants of the Leaf Litter Protocol; baseline study; leaf-litter ants; Nouragues; Winkler method |
| Abstract |
1. Leaf-litter ants represent a major component of biodiversity and are excellent bioindicators reflecting the health of terrestrial ecosystems. This study, conducted in an unspoiled forest near the Nouragues Research Station, represents the first inventory of leaf-litter ant diversity conducted in French Guiana, and so can be considered as the baseline dataset for ants in this country. 2. Ants were extracted from the leaf-litter using the Ants of the Leaf Litter Protocol, along an altitudinal gradient at four forest sites, including an inselberg. 3. A total of 196 ant species representing 46 genera distributed over eight subfamilies were collected. Four distinct communities spread over a gradient of diversity were thus identified: the liana forest was the most species-rich (140 species) followed by the forested plateau (102 species), the transition forest (87 species) and the forest at the top of the inselberg (71 species). 4. The discovery of species new to science plus several species recorded for the first time in French Guiana, coupled with the particular context of this area, suggests that the Nouragues Research Station might represent a centre of endemism. Once completed, this leaf-litter ant dataset will contribute greatly to the knowledge of ant biodiversity in French Guiana, and has the potential to progressively become an indispensable tool for country-wide conservation planning programmes. |
| Address |
[Groc, Sarah; Dejean, Alain; Martin, Jean-Michel] CNRS, Ecol Forets Guyane UMR 8172, Kourou, France, Email: sarah.groc@ecofog.gf |
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Thesis |
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| Publisher |
WILEY-LISS |
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 |
1752-458X |
ISBN |
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Medium |
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Conference |
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| Notes |
ISI:000268269400004 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
108 |
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| Author |
Orivel, J.; Grangier, J.; Foucaud, J.; Le Breton, J.; Andres, F.X.; Jourdan, H.; Delabie, J.H.C.; Fournier, D.; Cerdan, P.; Facon, B.; Estoup, A.; Dejean, A. |
| Title |
Ecologically heterogeneous populations of the invasive ant Wasmannia auropunctata within its native and introduced ranges |
Type |
Journal Article |
| Year |
2009 |
Publication |
Ecological Entomology |
Abbreviated Journal |
Ecol. Entomol. |
| Volume |
34 |
Issue |
4 |
Pages |
504-512 |
| Keywords |
Biological invasion; disturbance; ecological traits; native; Wasmannia auropunctata |
| Abstract |
1. The biology of most invasive species in their native geographical areas remains largely unknown. Such studies are, however, crucial in shedding light on the ecological and evolutionary processes underlying biological invasions. 2. The present study focuses on the little fire ant Wasmannia auropunctata, a species native to Central and South America that has been widely introduced and which has become invasive throughout the tropics. We characterise and compare several ecological traits of native populations in French Guiana with those in one of its introduced ranges, New Caledonia. 3. We found ecologically heterogeneous populations of W. auropunctata coexisting in the species' native geographical area. First, we found populations restricted to naturally perturbed areas (particularly floodplains) within the primary forest, and absent from the surrounding forest areas. These populations were characterised by low nest and worker densities. Second, we found dominant populations in recent anthropogenic areas (e.g. secondary forest or forest edge along road) characterised by high nest and worker densities, and associated with low ant species richness. The local dominance of W. auropunctata in such areas can be due to the displacement of other species (cause) or the filling-up of empty habitats unsuitable to other ants (effect). With respect to their demographic features and ant species richness, the populations of native anthropogenic habitats were to a large extent similar to the invasive populations introduced into remote areas. 4. The results point to the need for greater research efforts to better understand the ecological and demographic features of invasive species within their native ranges. |
| Address |
[Orivel, Jerome; Grangier, Julien; Le Breton, Julien] Univ Toulouse 3, Lab Evolut & Divers Biol, CNRS, UMR 5174, F-31062 Toulouse 9, France, Email: orivel@cict.fr |
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| Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
Place of Publication |
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Summary Language |
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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 |
0307-6946 |
ISBN |
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Expedition |
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| Notes |
ISI:000267659900010 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
202 |
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| Author |
Vedel, V.; Brena, C.; Arthur, W. |
| Title |
Demonstration of a heritable component of the variation in segment number in the centipede Strigamia maritima |
Type |
Journal Article |
| Year |
2009 |
Publication |
Evolution & Development |
Abbreviated Journal |
Evol. Dev. |
| Volume |
11 |
Issue |
4 |
Pages |
434-440 |
| Keywords |
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| Abstract |
Here we address the question of how arthropod segment number may evolve by reporting the results of further work on the model system Strigamia maritima. Recently, we showed that there was a plastic component of the variation in segment number within this species; now we demonstrate that there is also a heritable component. This is important because it enables a connection to be made between the known latitudinal trend among species of geophilomorph centipedes ( more segments at lower latitudes) and the parallel trend within them. This latter trend is best documented in S. maritima but is also known in several other species. However, while a general connection between the inter- and intraspecific trends can now be made, deciding upon a specific hypothesis of the nature of the selection involved is still problematic. We provide two alternative hypotheses, one based on the temperature-related plasticity in segment number being adaptive, the other based on it being nonadaptive. |
| Address |
[Vedel, Vincent; Arthur, Wallace] Natl Univ Ireland, Dept Zool, Sch Nat Sci, Galway, Ireland, Email: wallace.arthur@nuigalway.ie |
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| Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
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 Volume |
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Series Issue |
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Edition |
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| ISSN |
1520-541X |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
ISI:000267659600011 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
200 |
| Permanent link to this record |
