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Author (down) Guitet, S.; Herault, B.; Molto, Q.; Brunaux, O.; Couteron, P. pdf  url
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  Title Spatial structure of above-ground biomass limits accuracy of carbon mapping in rainforest but large scale forest inventories can help to overcome Type Journal Article
  Year 2015 Publication PLoS ONE Abbreviated Journal PLoS ONE  
  Volume 10 Issue 9 Pages e0138456  
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  Abstract Precise mapping of above-ground biomass (AGB) is a major challenge for the success of REDD+ processes in tropical rainforest. The usual mapping methods are based on two hypotheses: a large and long-ranged spatial autocorrelation and a strong environment influence at the regional scale. However, there are no studies of the spatial structure of AGB at the landscapes scale to support these assumptions.We studied spatial variation in AGB at various scales using two large forest inventories conducted in French Guiana. The dataset comprised 2507 plots (0.4 to 0.5 ha) of undisturbed rainforest distributed over the whole region. After checking the uncertainties of estimates obtained from these data, we used half of the dataset to develop explicit predictive models including spatial and environmental effects and tested the accuracy of the resulting maps according to their resolution using the rest of the data. Forest inventories provided accurate AGB estimates at the plot scale, for a mean of 325 Mg.ha-1. They revealed high local variability combined with a weak autocorrelation up to distances of no more than10 km. Environmental variables accounted for a minor part of spatial variation. Accuracy of the best model including spatial effects was 90 Mg.ha-1 at plot scale but coarse graining up to 2-km resolution allowed mapping AGB with accuracy lower than 50 Mg.ha-1. Whatever the resolution, no agreement was found with available pan-tropical reference maps at all resolutions.We concluded that the combined weak autocorrelation and weak environmental effect limit AGB maps accuracy in rainforest, and that a trade-off has to be found between spatial resolution and effective accuracy until adequate “wall-to-wall” remote sensing signals provide reliable AGB predictions. Waiting for this, using large forest inventories with low sampling rate (<0.5%) may be an efficient way to increase the global coverage of AGB maps with acceptable accuracy at kilometric resolution. Copyright: © 2015 Guitet et al.  
  Address Institut de Recherche Pour le Développement (IRD), UMR Amap, Montpellier, France  
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  Notes Export Date: 25 November 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 639  
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Author (down) Guitet, S.; Blanc, L.; Trombe, P.J.; Lehallier, B. openurl 
  Title Silvicultural Treatments in the Tropical Forests of Guiana: A Review of Ten Years of Trials Type Journal Article
  Year 2009 Publication Bois et Forets des Tropiques Abbreviated Journal Bois For. Trop.  
  Volume 63 Issue 301 Pages 7-19  
  Keywords cutting cycle; thinning; stand dynamics; logging; French Guiana  
  Abstract This article reviews an experimental system set up in French Guiana to test different selective thinning methods that started ten to fifteen years after logging in order to reconstitute commercially viable stands within the shortest time. The thinning methods tested involve a combination of selective intervention within a radius of 10 metres around crop trees and systematic intervention applied uniformly to the entire forest parcel. The resulting thinning intensity produces an 8% to 45% reduction in basal area. While the growth of the residual stand is strongly boosted in all species and for all diameters, there is little change in basal area because of high mortality and lower recruitment of commercial species. Standing commercial capital, however, is strongly affected by the thinning operations as defined. In effect, these thinning methods that benefit crop stems do not meet the objective of shorter rotations in Guiana's tropical logging forests. On the other hand, the measurements made in under-treatment stands agree with those obtained at the Paracou experimental station and confirm the need to adopt long cutting cycles of more than fifty years to ensure that the extraction of valuable species is sustainable in the current logging context in French Guiana.  
  Address [Guitet, Stephane; Trombe, Pierre-Julien; Lehallier, Benoit] Direct Reg Guyane, Off Natl Forets, F-97307 Cayenne, France  
  Corporate Author Thesis  
  Publisher CIRAD-CENTRE COOPERATION INT RECHERCHE AGRONOMIQUE POUR Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0006-579X ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000272488700002 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 91  
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Author (down) Guevara, J.E.; Damasco, G.; Baraloto, C.; Fine, P.V.A.; Peñuela, M.C.; Castilho, C.; Vincentini, A.; Cárdenas, D.; Wittmann, F.; Targhetta, N.; Phillips, O.; Stropp, J.; Amaral, I.; Maas, P.; Monteagudo, A.; Jimenez, E.M.; Thomas, R.; Brienen, R.; Duque, A.; Magnusson, W.; Ferreira, C.; Honorio, E.; de Almeida Matos, F.; Arevalo, F.R.; Engel, J.; Petronelli, P.; Vasquez, R.; ter Steege, H. url  openurl
  Title Low Phylogenetic Beta Diversity and Geographic Neo-endemism in Amazonian White-sand Forests Type Journal Article
  Year 2016 Publication Biotropica Abbreviated Journal Biotropica  
  Volume 48 Issue 1 Pages 34-46  
  Keywords Amazon; Neo-endemism; Phylogenetic beta diversity; Recent diversification; White sands  
  Abstract Over the past three decades, many small-scale floristic studies of white-sand forests across the Amazon basin have been published. Nonetheless, a basin-wide description of both taxonomic and phylogenetic alpha and beta diversity at regional scales has never been achieved. We present a complete floristic analysis of white-sand forests across the Amazon basin including both taxonomic and phylogenetic diversity. We found strong regional differences in the signal of phylogenetic community structure with both overall and regional Net Relatedness Index and Nearest Taxon Index values found to be significantly positive leading to a pattern of phylogenetic clustering. Additionally, we found high taxonomic dissimilarity but low phylogenetic dissimilarity in pairwise community comparisons. These results suggest that recent diversification has played an important role in the assembly of white-sand forests causing geographic neo-endemism patterns at the regional scale. © 2016 The Association for Tropical Biology and Conservation.  
  Address Ecology and Biodiversity Group, Utrecht University, Utrecht, Netherlands  
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  Notes Cited By :3; Export Date: 12 February 2016 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 660  
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Author (down) Guerrero, R.J.; Delabie, J.H.C.; Dejean, A. openurl 
  Title Taxonomic Contribution to the aurita Group of the Ant Genus Azteca (Formicidae: Dolichoderinae) Type Journal Article
  Year 2010 Publication Journal of Hymenoptera Research Abbreviated Journal J. Hymenopt. Res.  
  Volume 19 Issue 1 Pages 51-65  
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  Abstract We describe five new species in the aurita group of the genus Azteca: Azteca andreae sp. n. (French Guiana), Azteca diabolica sp. n. (Panama), Azteca laurae sp. n. (Brazil), Azteca linamariae sp. n. (Brazil and Colombia) and Azteca snellingi sp. n. (Panama). Four of these new species are based on gynes, while the last is based only on the worker caste. All of them bear the aurita group characteristics. The second taxon is remarkable, as it differs from all of the other members of the group in the exaggerated, horn-like extensions of the posterolateral vertex margins. Azteca snellingi sp. n. is named in honor of our colleague, Roy Snelling, in tribute to his life-long contribution to knowledge of the world of Hymenoptera. A key to all known species of the aurita group, based on gynes, is provided. We report also for the first time an intercast case for the genus Azteca, based on an Azteca schimperi specimen.  
  Address [Guerrero, Roberto J.] Univ Magdalena, INTROPIC, Grp Invest Insectos Neotrop, Santa Marta, Magdalena, Colombia, Email: robertojoseguerreroflorez@gmail.com  
  Corporate Author Thesis  
  Publisher INT SOC HYMENOPTERISTS Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1070-9428 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000285775800005 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 279  
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Author (down) Gruhn, G.; Dumez, S.; Moreau, P.-A.; Roy, M.; Morreale, O.; Schimann, H.; Courtecuisse, R.. doi  openurl
  Title The genus Resinicium in French Guiana and the West Indies: a morphological and molecular survey, revealing Resinicium grandisporum sp. nov. Type Journal Article
  Year 2017 Publication Cryptogamie, Mycologie Abbreviated Journal  
  Volume 38 Issue 4 Pages 1-15  
  Keywords  
  Abstract A revision of Resinicium collections (Basidiomycota, Hymenochaetales) from French Guiana and French West Indies is provided, and a new species, Resinicium grandisporum sp. nov., supported by morphological as well as phylogenetic analyses based on ITS DNA sequences, is described and illustrated. An updated key of the genus Resinicium is also provided, which includes species previously described from outside of the studied area.  
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  Call Number EcoFoG @ webmaster @ Serial 779  
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Author (down) Grossiord, C.; Christoffersen, B.; Alonso-Rodríguez, A.M.; Anderson-Teixeira, K.; Asbjornsen, H.; Aparecido, L.M.T.; Carter Berry, Z.; Baraloto, C.; Bonal, D.; Borrego, I.; Burban, B.; Chambers, J.Q.; Christianson, D.S.; Detto, M.; Faybishenko, B.; Fontes, C.G.; Fortunel, C.; Gimenez, B.O.; Jardine, K.J.; Kueppers, L.; Miller, G.R.; Moore, G.W.; Negron-Juarez, R.; Stahl, C.; Swenson, N.G.; Trotsiuk, V.; Varadharajan, C.; Warren, J.M.; Wolfe, B.T.; Wei, L.; Wood, T.E.; Xu, C.; McDowell, N.G. url  doi
openurl 
  Title Precipitation mediates sap flux sensitivity to evaporative demand in the neotropics Type Journal Article
  Year 2019 Publication Oecologia Abbreviated Journal Oecologia  
  Volume 191 Issue 3 Pages 519-530  
  Keywords Evapotranspiration; Plant functional traits; Transpiration; Vapor pressure deficit; drought; evapotranspiration; flux measurement; hydrological cycle; Neotropical Region; precipitation (chemistry); precipitation (climatology); tree; tropical forest; tropical region; vapor pressure; water; drought; evapotranspiration; forest; tree; vapor pressure; Droughts; Forests; Plant Transpiration; Trees; Vapor Pressure; Water  
  Abstract Transpiration in humid tropical forests modulates the global water cycle and is a key driver of climate regulation. Yet, our understanding of how tropical trees regulate sap flux in response to climate variability remains elusive. With a progressively warming climate, atmospheric evaporative demand [i.e., vapor pressure deficit (VPD)] will be increasingly important for plant functioning, becoming the major control of plant water use in the twenty-first century. Using measurements in 34 tree species at seven sites across a precipitation gradient in the neotropics, we determined how the maximum sap flux velocity (vmax) and the VPD threshold at which vmax is reached (VPDmax) vary with precipitation regime [mean annual precipitation (MAP); seasonal drought intensity (PDRY)] and two functional traits related to foliar and wood economics spectra [leaf mass per area (LMA); wood specific gravity (WSG)]. We show that, even though vmax is highly variable within sites, it follows a negative trend in response to increasing MAP and PDRY across sites. LMA and WSG exerted little effect on vmax and VPDmax, suggesting that these widely used functional traits provide limited explanatory power of dynamic plant responses to environmental variation within hyper-diverse forests. This study demonstrates that long-term precipitation plays an important role in the sap flux response of humid tropical forests to VPD. Our findings suggest that under higher evaporative demand, trees growing in wetter environments in humid tropical regions may be subjected to reduced water exchange with the atmosphere relative to trees growing in drier climates. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.  
  Address Earth Systems Science Division, Pacific Northwest National Laboratory, Richland, WA, United States  
  Corporate Author Thesis  
  Publisher Springer Verlag Place of Publication Editor  
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  ISSN 00298549 (Issn) ISBN Medium  
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  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 904  
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Author (down) Groc, S.; Orivel, J.; Dejean, A.; Martin, J.M.; Etienne, M.P.; Corbara, B.; Delabie, J.H.C. openurl 
  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  
  Corporate Author Thesis  
  Publisher WILEY-LISS Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1752-458X ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000268269400004 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 108  
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Author (down) Groc, S.; Delabie, J.H.C.; Longino, J.T.; Orivel, J.; Majer, J.D.; Vasconcelos, H.L.; Dejean, A. openurl 
  Title A new method based on taxonomic sufficiency to simplify studies on Neotropical ant assemblages Type Journal Article
  Year 2010 Publication Biological Conservation Abbreviated Journal Biol. Conserv.  
  Volume 143 Issue 11 Pages 2832-2839  
  Keywords Higher-taxon surrogacy; “Indicator taxa” surrogacy; Multi-taxonomic assemblages; Mixed-level method; Terrestrial arthropod assemblages; Biodiversity indicators  
  Abstract Insects, particularly ants, are good bioindicators of the state of ecosystems. Nevertheless, incorporating them into conservation surveys is expensive due to problems associated with their identification, which is exacerbated by the fact that there are fewer and fewer taxonomists working today. “Taxonomic sufficiency” (TS), which identifies organisms to a level of taxonomic resolution sufficient enough to satisfy the objectives of a study, has never been applied to Neotropical ant communities. We analysed five Neotropical datasets representing ant assemblages collected with different sampling methods in various habitats. We first treated them using two complementary and cumulative TS methods, higher-taxon and “indicator taxa” surrogacies, before testing a new approach called “mixed-level method” that combines the two previous approaches. For the higher-taxon surrogacy, we showed that, above species, genus is the most informative taxonomic level. Then, mixed-level method provided more information on ant assemblages than did the two others, even though the “indicator taxa” surrogacy was based on relevant indicator genera. Although habitat type has no effect on its efficiency, this new method is influenced by the dataset structure and the type of sampling method used to collect data. We have thus developed a new method for analyzing Neotropical ant faunas that enables the taxonomic work linked to the identification of problematic species to be significantly reduced, while conserving most of the information on the ant assemblage. This method should enhance the work of Neotropical entomologists not specialised in taxonomy, particularly those concerned with biological conservation and indication. (C) 2010 Elsevier Ltd. All rights reserved.  
  Address [Groc, Sarah; Dejean, Alain] CNRS, Ecol Forets Guyane UMR 8172, F-97379 Kourou, France, Email: sarah.groc@laposte.net  
  Corporate Author Thesis  
  Publisher ELSEVIER SCI LTD Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0006-3207 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000283412300048 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 22  
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Author (down) Groc, S.; Delabie, J.H.C.; Fernández, F.; Leponce, M.; Orivel, J.; Silvestre, R.; Vasconcelos, H.L.; Dejean, A. openurl 
  Title Leaf-litter ant communities in a pristine Guianese rainforest: stable functional structure versus high species turnover Type Journal Article
  Year 2013 Publication Myrmecological News Abbreviated Journal Myrmecol. News  
  Volume 19 Issue Pages 43-51  
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  Call Number EcoFoG @ webmaster @ Serial 523  
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Author (down) Groc, S.; Delabie, J.H.C.; Fernández, F.; Leponce, M.; Orivel, J.; Silvestre, R.; Vasconcelos, H.L.; Dejean, A. url  openurl
  Title Leaf-litter ant communities (Hymenoptera: Formicidae) in a pristine Guianese rain-forest: Stable functional structure versus high species turnover Type Journal Article
  Year 2014 Publication Myrmecological News Abbreviated Journal Myrmecological News  
  Volume 19 Issue Pages 43-51  
  Keywords Diversity gradient; Functional groups; Habitat heterogeneity; Litter-dwelling ant communities; Local scale; Pristine Amazonian rainforest; Taxonomic and functional structure  
  Abstract We compared the ant assemblages from four very heterogeneous habitats over a short-distance elevational gradient of vegetation (due to the presence of an inselberg) at the Nouragues Research Station, French Guiana. We focused on litter-dwelling ants, combining the use of pitfall traps and the Winkler method according to the Ants of the Leaf Litter Proto-col. This permitted us to note (1) a high leaf-litter ant diversity overall and a decreasing diversity gradient from the lowland rainforest to the top of the inselberg, and (2) differences in species density, composition and functional struc-ture. While the ant assemblages on the plateau and inselberg can be considered functionally similar and typical of an Amazonian rainforest, that of the transition forest, relatively homogenous, rather corresponded to an ant fauna typical of open areas. By contrast, the liana forest assemblage was unexpectedly richer and denser than the others, sheltering a litter-dwelling ant fauna dominated by numerous and abundant cryptic species. These taxonomical and functional dissi-milarities may reflect the influence of the environmental heterogeneity, which, through variable abiotic conditions, can contribute to maintaining a notably rich ant biodiversity in these Neotropical habitats.  
  Address Université de Toulouse, UPS (Ecolab), 118 route de Narbonne, 31062 Toulouse Cedex 9, France  
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  ISSN 19944136 (Issn) ISBN Medium  
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  Notes Export Date: 10 March 2014; Source: Scopus; Language of Original Document: English; Correspondence Address: Groc, S.; Instituto de Biologia, Universidade Federal de Uberlândia (UFU), 38400-902 Uberlândia, Minas Gerais, Brazil; email: groc.sarah@gmail.com Approved no  
  Call Number EcoFoG @ webmaster @ Serial 534  
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