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Author Hérault, B.; Piponiot, C. pdf  url
doi  openurl
  Title Key drivers of ecosystem recovery after disturbance in a neotropical forest: Long-term lessons from the Paracou experiment, French Guiana Type Journal Article
  Year 2018 Publication Forest Ecosystems Abbreviated Journal Forest Ecosystems  
  Volume 5 Issue 2 Pages  
  Keywords Amazonia; Carbon fluxes; Climate change; Ecological resilience; Ecosystem modeling; Tropical forests  
  Abstract Background: Natural disturbance is a fundamental component of the functioning of tropical rainforests let to natural dynamics, with tree mortality the driving force of forest renewal. With ongoing global (i.e. land-use and climate) changes, tropical forests are currently facing deep and rapid modifications in disturbance regimes that may hamper their recovering capacity so that developing robust predictive model able to predict ecosystem resilience and recovery becomes of primary importance for decision-making: (i) Do regenerating forests recover faster than mature forests given the same level of disturbance? (ii) Is the local topography an important predictor of the post-disturbance forest trajectories? (iii) Is the community functional composition, assessed with community weighted-mean functional traits, a good predictor of carbon stock recovery? (iv) How important is the climate stress (seasonal drought and/or soil water saturation) in shaping the recovery trajectory? Methods: Paracou is a large scale forest disturbance experiment set up in 1984 with nine 6.25 ha plots spanning on a large disturbance gradient where 15 to 60% of the initial forest ecosystem biomass were removed. More than 70,000 trees belonging to ca. 700 tree species have then been censused every 2 years up today. Using this unique dataset, we aim at deciphering the endogenous (forest structure and composition) and exogenous (local environment and climate stress) drivers of ecosystem recovery in time. To do so, we disentangle carbon recovery into demographic processes (recruitment, growth, mortality fluxes) and cohorts (recruited trees, survivors). Results: Variations in the pre-disturbance forest structure or in local environment do not shape significantly the ecosystem recovery rates. Variations in the pre-disturbance forest composition and in the post-disturbance climate significantly change the forest recovery trajectory. Pioneer-rich forests have slower recovery rates than assemblages of late-successional species. Soil water saturation during the wet season strongly impedes ecosystem recovery but not seasonal drought. From a sensitivity analysis, we highlight the pre-disturbance forest composition and the post-disturbance climate conditions as the primary factors controlling the recovery trajectory. Conclusions: Highly-disturbed forests and secondary forests because they are composed of a lot of pioneer species will be less able to cope with new disturbance. In the context of increasing tree mortality due to both (i) severe droughts imputable to climate change and (ii) human-induced perturbations, tropical forest management should focus on reducing disturbances by developing Reduced Impact Logging techniques.  
  Address Université de la Guyane, UMR EcoFoG (AgroParistech, Cirad, CNRS, Inra, Université des Antilles), Campus Agronomique, Kourou, French Guiana, 97310, France  
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  Notes Cited By :1; Export Date: 1 September 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 812  
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Author Dejean, A.; Azémar, F.; Petitclerc, F.; Delabie, J.H.C.; Corbara, B.; Leroy, C.; Céréghino, R.; Compin, A. url  doi
openurl 
  Title Highly modular pattern in ant-plant interactions involving specialized and non-specialized myrmecophytes Type Journal Article
  Year 2018 Publication Science of Nature Abbreviated Journal  
  Volume 105 Issue 43 Pages  
  Keywords Ant-plant mutualism; Ecological network; Modularity; Myrmecophytes; Nestedness; Sympatric species  
  Abstract Because Tachia guianensis (Gentianaceae) is a “non-specialized myrmecophyte” associated with 37 ant species, we aimed to determine if its presence alters the ant guild associated with sympatric “specialized myrmecophytes” (i.e., plants sheltering a few ant species in hollow structures). The study was conducted in a hilly zone of a neotropical rainforest where two specialized myrmecophytes grow at the bottom of the slopes, another at mid-slope, and a fourth on the hilltops. Tachia guianensis, which occurred everywhere, had its own guild of associated ant species. A network analysis showed that its connections with the four other myrmecophytes were rare and weak, the whole resulting in a highly modular pattern of interactions with one module (i.e., subnetwork) per myrmecophyte. Three ant species parasitized three out of the four specialized myrmecophytes (low nestedness noted), but were not or barely associated with T. guianensis that therefore did not influence the parasitism of specialized myrmecophytes. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.  
  Address AMAP, IRD, CIRAD, CNRS, INRA, Université de Montpellier, Montpellier, France  
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  Notes Export Date: 1 September 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 815  
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Author Medjigbodo, G.; Rozière, E.; Charrier, K.; Izoret, L.; Loukili, A. url  doi
openurl 
  Title Hydration, shrinkage, and durability of ternary binders containing Portland cement, limestone filler and metakaolin Type Journal Article
  Year 2018 Publication Construction and Building Materials Abbreviated Journal  
  Volume 183 Issue Pages 114-126  
  Keywords Durability; Limestone filler; Metakaolin; Shrinkage; Strength; Ternary binders  
  Abstract A partial replacement of the clinker by latent hydraulic or pozzolanic materials is encouraged due to environmental and specific technical requirements. Such substitution remains limited to a relatively low level (less than 30% by mass of cementitious materials). An experimental research work was carried out on mortars made with binary and ternary binders (Portland cement; metakaolin; limestone filler) to reach 45% total replacement. In order to investigate the activating effect of reduced water-to-cement ratio, two series of mixtures were designed with W/C0 of 0.42 and 0.5. Their heat of hydration, portlandite content, shrinkage, porosity, and carbonation were monitored. The tests were performed to understand the evolution of their relative strength (activity index) and durability parameters. The strength development of mortars with ternary binders was found to depend on metakaolin properties, including manufacturing process and particle size distribution. Reducing W/C0 ratio accelerated pozzolanic reaction and allowed improving early-age strength and durability parameters. © 2018 Elsevier Ltd  
  Address Association Technique de l'Industrie des Liants Hydrauliques (ATILH), 7 place de la Défense, Paris La Défense, 92974, France  
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  Notes Export Date: 1 September 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 814  
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Author Clair, B.; Déjardin, A.; Pilate, G.; Alméras, T. pdf  url
doi  openurl
  Title Is the G-layer a tertiary cell wall? Type Journal Article
  Year 2018 Publication Frontiers in Plant Science Abbreviated Journal  
  Volume 9 Issue Pages 623  
  Keywords Flax; G-layer; Gelatinous layer; Maturation stress; Secondary cell wall; Tension wood; Tertiary cell wall  
  Abstract  
  Address LMGC, CNRS, Université de Montpellier, Montpellier, France  
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  Notes Export Date: 31 May 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 805  
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Author Petit, M.; Denis, T.; Rux, O.; Richard-Hansen, C.; Berzins, R. url  doi
openurl 
  Title Estimating jaguar (Panthera onca) density in a preserved coastal area of French Guiana Type Journal Article
  Year 2018 Publication Mammalia Abbreviated Journal Mammalia  
  Volume 82 Issue 2 Pages 188-192  
  Keywords camera trapping; density; French Guiana; home range; Panthera onca; spatially explicit capture recapture  
  Abstract Knowledge of the jaguar population is needed in French Guiana that faces an increase of human-jaguar conflicts. We carried out a camera trap survey to assess jaguar local density and home range size in a preserved coastal area of French Guiana. We ran spatially explicit capture recapture (SECR) models. In our model, the scale parameter σ, that is linked to the home range size, was larger for males (σ=3.87±0.59 SE km) than for females (σ=2.33±0.30 SE km). The assessed jaguar density was 3.22±0.87 SE ind. 100 km â '2, which should be considered as an optimal density in a French Guiana coastal area.  
  Address Office National de la Chasse et de la Faune Sauvage, Campus Agronomique, BP316, Kourou Cedex, French Guiana  
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  Notes Export Date: 7 May 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 803  
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Author Ogeron, C.; Odonne, G.; Cristinoi, A.; Engel, J.; Grenand, P.; Beauchene, J.; Clair, B.; Davy, D. pdf  url
doi  openurl
  Title Palikur traditional roundwood construction in eastern French Guiana: Ethnobotanical and cultural perspectives Type Journal Article
  Year 2018 Publication Journal of Ethnobiology and Ethnomedicine Abbreviated Journal Journal of Ethnobiology and Ethnomedicine  
  Volume 14 Issue 28 Pages  
  Keywords Amazonia; Annonaceae; Architecture; Non-timber forest products; Oyapock; Palikur; Sapotaceae; Traditional technological knowledge  
  Abstract Background: Palikur Amerindians live in the eastern part of French Guiana which is undergoing deep-seated changes due to the geographical and economic opening of the region. So far, Palikur's traditional ecological knowledge is poorly documented, apart from medicinal plants. The aim of this study was to document ethnobotanical practices related to traditional construction in the region. Methods: A combination of qualitative and quantitative methods was used. Thirty-nine Palikur men were interviewed in three localities (Saint-Georges de l'Oyapock, Regina and Trois-Palétuviers) between December 2013 and July 2014. Twenty-four inventories of wood species used in traditional buildings were conducted in the villages, as well as ethnobotanical walks in the neighboring forests, to complete data about usable species and to determine Linnaean names. Results: After an ethnographic description of roundwood Palikur habitat, the in situ wood selection process of Palikur is precisely described. A total of 960 roundwood pieces were inventoried in situ according to Palikur taxonomy, of which 860 were beams and rafters, and 100 posts in 20 permanent and 4 temporary buildings. Twenty-seven folk species were identified. Sixty-three folk species used in construction were recorded during ethnobotanical walks. They correspond to 263 botanical species belonging to 25 families. Posts in permanent buildings were made of yawu (Minquartia guianensis) (51%) and wakap (Vouacapoua americana) (14%). Beams and rafters were made of wood from Annonaceae (79%) and Lecythidaceae (13%) families. The most frequently used species were kuukumwi priye (Oxandra asbeckii), kuukumwi seyne (Pseudoxandra cuspidata), and pukuu (Xylopia nitida and X. cayennensis). Conclusions: Although the Palikur's relationship with their habitat is undergoing significant changes, knowledge about construction wood is still very much alive in the Oyapock basin. Many people continue to construct traditional buildings alongside modern houses, using a wide array of species described here for the first time, along with the techniques used.  
  Address Université des Antilles, Université de Guyane, CIRAD, UMR Ecologie des Forêts de Guyane (EcoFoG), AgroParisTech, Cirad, INRA, Kourou, France  
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  Notes Export Date: 7 May 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 802  
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Author Pétillon, J.; Leroy, B.; Djoudi, E.A.; Vedel, V. url  doi
openurl 
  Title Small and large spatial scale coexistence of ctenid spiders in a neotropical forest (French Guiana) Type Journal Article
  Year 2018 Publication Tropical Zoology Abbreviated Journal  
  Volume 31 Issue 2 Pages 85-98  
  Keywords Araneae; flooding; Guianese shield; inselberg; juveniles  
  Abstract While spiders constitute the most abundant and diverse arthropods in many habitats, they remained under-studied, especially in tropical rainforests. The goal of this study is to assess the spatial distribution of the spider family Ctenidae by assessing associations of species diversity and population traits among different habitat conditions. Fieldwork was carried out during 2013 in habitats varying in flooding frequency (plateau vs. flooded forest) and elevation (inselberg vs. lowland) in the Nouragues National Natural Reserve, French Guiana. Assemblage composition, population structure, and trait measurements of one dominant species were assessed using hand collection in replicated quadrats. We found strong effects on ctenid assemblages attributable to both elevation and flooding, with changes in relative abundance of species among habitats, but few correlated densities between species. At the population level, main differences in species distribution between and within habitats were detected only when juveniles were taken into account. No effect of elevation was found on the measurements of traits of the dominant species, but legs were proportionally shorter in flooded habitats, suggesting reduced active dispersal in these habitats. Our study highlights the value of complementary of measures of diversity and traits at different biological scales in Ctenidae.  
  Address UMR CNRS 8175 Ecologie des Forêts de Guyane, Université Antilles-Guyane, Kourou Cedex, Guyane Française, France  
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  Notes Export Date: 23 April 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 800  
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Author Morel, H.; Lehnebach, R.; Cigna, J.; Ruelle, J.; Nicolini, É.; Beauchene, J. pdf  url
doi  openurl
  Title Basic wood density variations of Parkia velutina Benoist, a long-lived heliophilic Neotropical rainforest tree Type Journal Article
  Year 2018 Publication Bois et Forets des Tropiques Abbreviated Journal  
  Volume 335 Issue Pages 59-69  
  Keywords Curvilinear pattern; French Guiana; Intra-tree; Tropical species  
  Abstract Investigations of basic radial wood density (WD) in tropical trees revealed linear patterns and some curvilinear patterns. Studies usually disregard longitudinal variations, which are often considered to be similar to radial variations. This study aimed to show (1) a new radial curvilinear WD pattern, (2) differences in amplitude between radial and longitudinal gradients and (3) to partition WD variations according to different scales in Parkia velutina, an emergent tree found in Neotropical rain forests. We collected full discs from six felled trees and radial cores from 10 standing trees to check WD variability, plus one dominant axis per tree for analysis of height growth rates. This species showed very high growth rates indicative of heliophilic habits. WD varied from 0.194 to 0.642 g/cm3. Such amplitude is rarely observed within the same tree. Radial variation in WD was curvilinear, with an amplitude generally less than the longitudinal amplitude. Consequently, in mature trees, WD values in the crown were higher than those in the outer trunk. WD variations can be highly significant at different scales. The variance partitioning also revealed that the whole WD range of Parkia velutina is more accurately estimated intra-individually when both longitudinal and radial gradient are covered.  
  Address INRA, LERFoB, AgroParisTech, Nancy, France  
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  Notes Export Date: 20 April 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 799  
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Author Guitet, S.; Sabatier, D.; Brunaux, O.; Couteron, P.; Denis, T.; Freycon, V.; Gonzalez, S.; Hérault, B.; Jaouen, G.; Molino, J.-F.; Pélissier, R.; Richard-Hansen, C.; Vincent, G. pdf  url
doi  openurl
  Title Disturbance Regimes Drive the Diversity of Regional Floristic Pools Across Guianan Rainforest Landscapes Type Journal Article
  Year 2018 Publication Scientific Reports Abbreviated Journal Sci. Rep.  
  Volume 8 Issue Pages 3872  
  Keywords  
  Abstract Disturbances control rainforest dynamics, and, according to the intermediate disturbance hypothesis (IDH), disturbance regime is a key driver of local diversity. Variations in disturbance regimes and their consequences on regional diversity at broad spatiotemporal scales are still poorly understood. Using multidisciplinary large-scale inventories and LiDAR acquisitions, we developed a robust indicator of disturbance regimes based on the frequency of a few early successional and widely distributed pioneer species. We demonstrate at the landscape scale that tree-species diversity and disturbance regimes vary with climate and relief. Significant relationships between the disturbance indicator, tree-species diversity and soil phosphorus content agree with the hypothesis that rainforest diversity is controlled both by disturbance regimes and long-term ecosystem stability. These effects explain the broad-scale patterns of floristic diversity observed between landscapes. In fact, species-rich forests in highlands, which have benefited from long-term stability combined with a moderate and regular regime of local disturbances, contrast with less diversified forests on recently shaped lowlands, which have undergone more recent changes and irregular dynamics. These results suggest that taking the current disturbance regime into account and including geomorphological stratifications in climate-vegetation models may be an effective way to improve the prediction of changes in species diversity under climate change. © 2018 The Author(s).  
  Address AgroParisTech, EcoFoG, Kourou, French Guiana  
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  Notes Export Date: 21 March 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 798  
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Author Santiago, L.S.; De Guzman, M.E.; Baraloto, C.; Vogenberg, J.E.; Brodie, M.; Hérault, B.; Fortunel, C.; Bonal, D. url  doi
openurl 
  Title Coordination and trade-offs among hydraulic safety, efficiency and drought avoidance traits in Amazonian rainforest canopy tree species Type Journal Article
  Year 2018 Publication New Phytologist Abbreviated Journal New Phytol.  
  Volume 218 Issue 3 Pages 1015-1024  
  Keywords Amazonian forest; cavitation; drought; hydraulic conductivity; sapwood capacitance; turgor loss point; wood density; xylem; cavitation; climate change; drought; forest canopy; forest ecosystem; hydraulic conductivity; rainforest; species diversity; tree; tropical forest; vulnerability; wood; Amazonia; French Guiana; Paracou  
  Abstract Predicting responses of tropical forests to climate change-type drought is challenging because of high species diversity. Detailed characterization of tropical tree hydraulic physiology is necessary to evaluate community drought vulnerability and improve model parameterization. Here, we measured xylem hydraulic conductivity (hydraulic efficiency), xylem vulnerability curves (hydraulic safety), sapwood pressure–volume curves (drought avoidance) and wood density on emergent branches of 14 common species of Eastern Amazonian canopy trees in Paracou, French Guiana across species with the densest and lightest wood in the plot. Our objectives were to evaluate relationships among hydraulic traits to identify strategies and test the ability of easy-to-measure traits as proxies for hard-to-measure hydraulic traits. Xylem efficiency was related to capacitance, sapwood water content and turgor loss point, and other drought avoidance traits, but not to xylem safety (P50). Wood density was correlated (r = −0.57 to −0.97) with sapwood pressure–volume traits, forming an axis of hydraulic strategy variation. In contrast to drier sites where hydraulic safety plays a greater role, tropical trees in this humid tropical site varied along an axis with low wood density, high xylem efficiency and high capacitance at one end of the spectrum, and high wood density and low turgor loss point at the other.  
  Address INRA, UMR Silva, AgroParisTech, Université de Lorraine, Nancy, 54000, France  
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  Publisher Blackwell Publishing Ltd Place of Publication Editor  
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  ISSN 0028646x (Issn) ISBN Medium  
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  Notes Cited By :6; Export Date: 3 December 2018; Coden: Nepha; Correspondence Address: Santiago, L.S.; Department of Botany & Plant Sciences, University of California, 2150 Batchelor Hall, United States; email: santiago@ucr.edu; Funding details: Centre de Coopération Internationale en Recherche Agronomique pour le Développement, CIRAD, FEDER 2014–2020; Funding details: Centre de Coopération Internationale en Recherche Agronomique pour le Développement, CIRAD, Project; Funding details: Centre de Coopération Internationale en Recherche Agronomique pour le Développement, CIRAD, GY0006894; Funding details: University of California, UC; Funding details: National Institute of Food and Agriculture, NIFA; Funding details: ANR-10-LABX-0025; Funding text 1: We would like to thank Benôıt Burban and Jean-Yves Goret for laboratory support, Jocelyn Cazal and Valentine Alt for skillfully climbing trees for samples, Aurelie Dourdain for database support, and Clement Stahl, John Sperry, Sean Gleason, Todd Dawson, Steve Davis, JoséLuiz Silva, Aleyda Acosta Rangel and three anonymous reviewers for comments and discussions on the data presented. The study has been supported by the TRY initiative on plant traits (http://www.try-db.org). The TRY initiative and database is hosted, developed and maintained by J. Kattge and G. Boenisch (Max Planck Institute for Biogeochemistry, Jena, Germany). TRY is currently supported by Future Earth/ bioDISCOVERY and the German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig. We also acknowledge the University of California, Botany and Plant Sciences Department and the USDA National Institute of Food and Agriculture for support. We are grateful to the CIRAD and the GFclim project (FEDER 2014–2020, Project GY0006894) for financial support of the Paracou research station. 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