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Author (down) Leponce, Maurice ; Corbara, Bruno ; Delabie, Jacques H.C. ; Orivel, Jérome ; Aberlenc, Henri-Pierre ; Bail, Johannes ; Barrios, Hector ; Campos, Ricardo I. ; Cardoso do Nascimento, Ivan ; Compin, Arthur ; Didham, Raphaël K. ; Floren, Andreas ; Medianero, Enrique ; Ribeiro, Sérvio P. ; Roisin, Yves ; Schmidl, Juergen ; Tishechkin, Alexey K. ; Winchester, Neville N. ; Basset, Yves ; Dejean, Alain doi  openurl
  Title Spatial and functional structure of an entire ant assemblage in a lowland Panamanian rainforest Type Journal Article
  Year 2021 Publication Basic and Applied Abbreviated Journal  
  Volume 56 Issue Pages 32-44  
  Keywords  
  Abstract Ants are a major ecological group in tropical rainforests. Few studies in the Neotropics have documented the distribution of ants from the ground to the canopy, and none have included the understorey. A previous analysis of an intensive arthropod study in Panama, involving 11 sampling methods, showed that the factors influencing ant β diversity (i.e., changes in assemblage composition) were, in decreasing order of importance, the vertical (height), temporal (season), and horizontal (geographic distance) dimensions. In the present study, we went one step further and aimed (1) to identify the best sampling methods to study the entire ant assemblage across the three strata, (2) to test if all strata show a similar horizontal β diversity and (3) to analyze the functional structure of the entire ant assemblage. We identified 405 ant species from 11 subfamilies and 68 genera. Slightly more species were sampled in the canopy than on the ground; they belonged to distinct sub-assemblages. The understorey fauna was mainly a mixture of species found in the other two strata. The horizontal β diversity between sites was similar for the three strata. About half of the ant species foraged in two (29%) or three (25%) strata. A single method, aerial flight interception traps placed alongside tree trunks, acting as arboreal pitfall traps, collected half of the species and reflected the vertical stratification. Using the functional traits approach, we observed that generalist species with mid-sized colonies were by far the most numerous (31%), followed by ground- or litter-dwelling species, either specialists (20%), or generalists (16%), and arboreal species, either generalists (19%) or territorially dominant (8%), and finally army ants (5%). Our results reinforce the idea that a proper understanding of the functioning of ant assemblages requires the inclusion of arboreal ants in survey programs.  
  Address  
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  Publisher Elsevier Place of Publication Editor  
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  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 1026  
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Author (down) Leponce, M.;Delabie, J.H.C.;Orivel, J.;Jacquemin, J.;Calvo Martin, M.;Dejean, A. doi  openurl
  Title Tree-dwelling ant survey (Hymenoptera, Formicidae) in Mitaraka, French Guiana Type Journal Article
  Year 2019 Publication Zoosystema Abbreviated Journal  
  Volume 40 Issue sp1 Pages 163-179  
  Keywords  
  Abstract Ants constitute a substantial part of the arthropod biomass in rainforests. Most studies have focused on ground-dwelling ants, which constitute almost half of the diversity of the ant assemblage. We report here the results of the first survey of tree-dwelling ants in French Guiana on a plateau and in a swamp palm forest (Euterpe oleracea Mart.) in the Mitaraka Mountains. We were interested in seeing the effect of topography and geographic distance on species richness and composition and to gather information on the species distribution on tree trunks. The fauna of Mitaraka was compared with one from a site 350 km distant (Petit Saut). In total 105 trees were sampled (30, 30, 45 in the plateau and the swamp forests of Mitaraka, and in Petit Saut plateau forest, respectively). Arboreal ants were attracted using tuna and honey baits spread along a rope reaching an upper branch, except for the palm swamp forest where the baits were only placed at 2 m high. A total of 34, 13 and 22 species were observed in these three respective sites. Six of these species are new records for French Guiana. In Mitaraka Camponotus femoratus (Fabricius, 1804) and Crematogaster leviorLongino, 2003 co-occurred on trees (parabiotic association) and were among the most common species, along with Crematogaster tenuiculaForel, 1904 which was found on other trees (species exclusion). The Mitaraka Mountains appeared more species rich and had a species composition distinct from Petit Saut. Topography also influenced ant species composition. Almost half of the species collected by the baitline method were exclusively foraging in the canopy.  
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  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 883  
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Author (down) Lenoir, A.; Touchard, A.; Devers, S.; Christidès, J.-P.; Boulay, R.; Cuvillier-Hot, V. doi  openurl
  Title Ant cuticular response to phthalate pollution Type Journal Article
  Year 2014 Publication Environmental Science and Pollution Research Abbreviated Journal Environ. Sci. Pollut. Res.  
  Volume 21 Issue 23 Pages 13446-13451  
  Keywords Absorption; Ants; Bbp; Bioindicator; Cuticle; Dbp; Dehp; DiBP; Phthalates; Pollutants  
  Abstract Phthalates are common atmospheric contaminants used in the plastic industry. Ants have been shown to constitute good bioindicators of phthalate pollution. Hence, phthalates remain trapped on ant cuticles which are mostly coated with long-chain hydrocarbons. In this study, we artificially contaminated Lasius niger ants with four phthalates: dibutyl phthalate (DBP), diisobutyl phthalate (DiBP), di(2-ethylhexyl) phthalate (DEHP), and benzyl butyl phthalate (BBP). The first three have previously been found on ants in nature in Touraine (France), while the fourth has not. The four phthalates disappeared rapidly (less than 5 days) from the cuticles of live ants. In contrast, on the cuticles of dead ants, DEHP quantities remained unchanged over time. These results indicate that phthalates are actively absorbed by the cuticles of live ants. Cuticular absorption of phthalates is nonspecific because eicosane, a nonnatural hydrocarbon on L. niger cuticle, was similarly absorbed. Ants are important ecological engineers and may serve as bioindicators of ecosystem health. We also suggest that ants and more generally terrestrial arthropods may contribute to the removal of phthalates from the local environment.  
  Address CNRS, UMR Écologie des Forêts de Guyane (EcoFoG), Campus Agronomique, BP 316Kourou Cedex, France  
  Corporate Author Thesis  
  Publisher Springer Verlag Place of Publication Editor  
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  Series Volume Series Issue Edition  
  ISSN 09441344 (Issn) ISBN Medium  
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  Notes Export Date: 5 December 2014; Coden: Esple; Correspondence Address: Lenoir, A.; IRBI, Institut de Recherche sur la Biologie de l’Insecte, UMR CNRS 7261, Université François RabelaisFrance Approved no  
  Call Number EcoFoG @ webmaster @ Serial 570  
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Author (down) Lenoir, A.; Devers, S.; Touchard, A.; Dejean, A. url  doi
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  Title The Guianese population of the fire ant Solenopsis saevissima is unicolonial Type Journal Article
  Year 2016 Publication Insect Science Abbreviated Journal Insect Science  
  Volume 23 Issue 5 Pages 739-745  
  Keywords biological invasions; cuticular hydrocarbons; fire ants; unicoloniality  
  Abstract In this study, conducted in French Guiana, a part of the native range of the fire ant Solenopsis saevissima, we compared the cuticular hydrocarbon profiles of media workers with previous results based on intraspecific aggressiveness tests. We noted a strong congruence between the two studies permitting us to delimit 2 supercolonies extending over large distances (up to 54 km), a phenomenon known as unicoloniality. Solenopsis geminata workers, taken as an out-group for cluster analyses, have a very different cuticular hydrocarbon profile. Because S. saevissima has been reported outside its native range, our conclusion is that this species has the potential to become invasive because unicoloniality (i.e., the main attribute for ants to become invasive) was shown at least for the Guianese population. © 2015 Institute of Zoology, Chinese Academy of Sciences  
  Address CNRS, Ecolab (UMR-CNRS 5245), Toulouse, France  
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  Notes Export Date: 3 October 2016 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 696  
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Author (down) Lenoir, A.; Boulay, R.; Dejean, A.; Touchard, A.; Cuvillier-Hot, V. doi  openurl
  Title Phthalate pollution in an Amazonian rainforest Type Journal Article
  Year 2016 Publication Environmental Science and Pollution Research Abbreviated Journal  
  Volume 23 Issue 16 Pages 16865-16872  
  Keywords  
  Abstract Phthalates are ubiquitous contaminants and endocrine-disrupting chemicals that can become trapped in the cuticles of insects, including ants which were recognized as good bioindicators for such pollution. Because phthalates have been noted in developed countries and because they also have been found in the Arctic, a region isolated from direct anthropogenic influence, we hypothesized that they are widespread. So, we looked for their presence on the cuticle of ants gathered from isolated areas of the Amazonian rainforest and along an anthropogenic gradient of pollution (rainforest vs. road sides vs. cities in French Guiana). Phthalate pollution (mainly di(2-ethylhexyl) phthalate (DEHP)) was higher on ants gathered in cities and along road sides than on those collected in the pristine rainforest, indicating that it follows a human-mediated gradient of disturbance related to the use of plastics and many other products that contain phthalates in urban zones. Their presence varied with the ant species; the cuticle of Solenopsis saevissima traps higher amount of phthalates than that of compared species. However, the presence of phthalates in isolated areas of pristine rainforests suggests that they are associated both with atmospheric particles and in gaseous form and are transported over long distances by wind, resulting in a worldwide diffusion. These findings suggest that there is no such thing as a “pristine” zone.  
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  ISSN 1614-7499 ISBN Medium  
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  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Lenoir2016 Serial 700  
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Author (down) Leitão, R.P.; Zuanon, J.; Villéger, S.; Williams, S.E.; Baraloto, C.; Fortunel, C.; Mendonça, F.P.; Mouillot, D. doi  openurl
  Title Rare species contribute disproportionately to the functional structure of species assemblages Type Journal Article
  Year 2016 Publication Proceedings of the Royal Society B: Biological Sciences Abbreviated Journal Proceedings of the Royal Society B: Biological Sciences  
  Volume 283 Issue 1828 Pages  
  Keywords Conservation; Extinction; Functional diversity; Null models; Rarity index; Tropical biodiversity  
  Abstract There is broad consensus that the diversity of functional traits within species assemblages drives several ecological processes. It is also widely recognized that rare species are the first to become extinct following human-induced disturbances. Surprisingly, however, the functional importance of rare species is still poorly understood, particularly in tropical species-rich assemblages where the majority of species are rare, and the rate of species extinction can be high. Here, we investigated the consequences of local and regional extinctions on the functional structure of species assemblages. We used three extensive datasets (stream fish from the Brazilian Amazon, rainforest trees from French Guiana, and birds from the Australian Wet Tropics) and built an integrative measure of species rarity versuscommonness, combining local abundance, geographical range, andhabitat breadth. Using different scenarios of species loss, we found a disproportionate impact of rare species extinction for the three groups, with significant reductions in levels of functional richness, specialization, and originality of assemblages, which may severely undermine the integrity of ecological processes. The whole breadth of functional abilities within species assemblages, which is disproportionately supported by rare species, is certainly critical in maintaining ecosystems particularly under the ongoing rapid environmental transitions. © 2016 The Author(s) Published by the Royal Society. All rights reserved.  
  Address Instituto Federal de Educação, Ciência e Tecnologia, Presidente Figueiredo, Brazil  
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  Notes Export Date: 7 May 2016 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 676  
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Author (down) Lehours, A.-C.; Jeune, A.-H.L.; Aguer, J.-P.; Céréghino, R.; Corbara, B.; Kéraval, B.; Leroy, C.; Perrière, F.; Jeanthon, C.; Carrias, J.-F. doi  openurl
  Title Unexpectedly high bacteriochlorophyll a concentrations in neotropical tank bromeliads Type Journal Article
  Year 2016 Publication Environmental Microbiology Reports Abbreviated Journal Environmental Microbiology Reports  
  Volume 8 Issue 5 Pages 689-698  
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  Abstract The contribution of bacteriochlorophyll a (BChl a) to photosynthetically driven electron transport is generally low in aquatic and terrestrial systems. Here, we provide evidence that anoxygenic bacterial phototrophy is widespread and substantial in water retained by tank bromeliads of a primary rainforest in French Guiana. An analysis of the water extracted from 104 randomly selected tank bromeliads using infrared fluorimetry suggested the overall presence of abundant anoxygenic phototrophic bacterial populations. We found that purple bacteria dominated these populations responsible for unusually high BChl a/chlorophyll a ratios (>50%). Our data suggest that BChl a-based phototrophy in tank bromeliads can have significant effects on the ecology of tank-bromeliad ecosystems and on the carbon and energy fluxes in Neotropical forests.  
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  ISSN 1758-2229 ISBN Medium  
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  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 709  
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Author (down) Lehnebach, R.; Morel, H.; Bossu, J.; Le Moguédec, G.; Amusant, N.; Beauchene, J.; Nicolini, E. url  doi
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  Title Heartwood/sapwood profile and the tradeoff between trunk and crown increment in a natural forest: the case study of a tropical tree (Dicorynia guianensis Amsh., Fabaceae) Type Journal Article
  Year 2017 Publication Trees – Structure and Function Abbreviated Journal Trees – Structure and Function  
  Volume 31 Issue 1 Pages 199-214  
  Keywords Dicorynia guianensis; Growth allocation; Heartwood; Ontogeny; Sapwood; Tropical tree  
  Abstract Key message: Sapwood area and the radial growth rate of the trunk follow the same pattern at breast height, with an initial increase and subsequent constant value, resulting from the increasing growth allocation toward the crown rather than tree decline. Heartwood area and heartwood volume in the trunk increase more rapidly after this shift occurs. Abstract: Sapwood (SW) and heartwood (HW) are two functionally distinct classifications of wood in perennial stems for which quantities can vary greatly in tropical trees. Numerous positive correlations have been found between the radial growth rate (RGR) and SW quantity; however, variations in the SW/HW quantities have not been studied in light of the ontogenetic variation of RGR. Wood core sampling, intensive measurements of tree structure (number of branches, stem volumes), and radial growth monitoring were performed on an abundant and highly exploited tree species in French Guiana (Dicorynia guianensis) to investigate the relationship between RGR, SW/HW quantity, tree structure, and their variations on the course of a tree’s ontogeny. SW area and RGR followed the same pattern of variation throughout tree development, both increasing first and reaching a steady state after 50 cm DBH (diameter at breast height). After this value, we observed a strong increase in both the HW area and HW volume increment, concomitant with a more rapid increase in crown volume. The stabilization of RGR for trees with DBH > 50 cm was related not to a tree’s decline but rather to an increasing wood allocation to the crown, confirming that RGR at breast height is a poor indicator of whole-tree growth for bigger individuals. We also confirmed that HW formation is an ontogenetic process managing SW quantity that is continuously and increasingly produced within the crown as the tree grows. This study highlights the effect of growth-mediated ontogenetic changes on the localization of water and carbohydrate storage within a tree, resulting from SW and HW dynamics throughout tree ontogeny. © 2016, Springer-Verlag Berlin Heidelberg.  
  Address CIRAD, UMR EcoFoG, BP701, Kourou Cedex, French Guiana  
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  Notes Export Date: 19 February 2017 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 733  
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Author (down) Lehnebach, R.; Doumerc, L.; Clair, B.; Alméras, T. url  doi
openurl 
  Title Mechanical stress in the inner bark of 15 tropical tree species and the relationship with anatomical structure Type Journal Article
  Year 2020 Publication Botany Abbreviated Journal Bot.  
  Volume 98 Issue 1 Pages 1-8  
  Keywords Bark anatomical structure; Mechanical stress; Sclereids; Secondary phloem; Tree biomechanics; Tropical species  
  Abstract Recent studies have shown that the inner bark is implicated in the postural control of inclined tree stems through the interaction between wood radial growth and tangential expansion of a trellis fiber network in bark. Assessing the taxonomic extent of this mechanism requires a screening of the diversity in bark anatomy and mechanical stress. The mechanical state of bark was measured in 15 tropical tree species from various botanical families on vertical mature trees, and related to the anatomical structure of the bark. Significant tensile or compressive longitudinal stresses were observed in the stems of most species. Tensile longitudinal stress was observed in various botanical families and was always associated with fibers arranged in a trellis-like structure and strong dilatation of rays. The highest tensile stress was recorded in species with gelatinous fibers forming a treillis. Compressive stress was typically associated with a large amount of sclereids in the bark, supporting the differentiation of sclereids as a potential origin of the generation of longitudinal compressive stresses in bark. In species exhibiting both a fibrous trellis structure and a significant amount of sclereids, the sign of longitudinal stress may depend on the balance between these two mechanisms.  
  Address Faculty of Bioscience Engineering, Laboratory of Wood Technology, Woodlab, Coupure Links 653, Gent, B-9000, Belgium  
  Corporate Author Thesis  
  Publisher Canadian Science Publishing Place of Publication Editor  
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  ISSN 19162804 (Issn) ISBN Medium  
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  Notes Cited By :1; Export Date: 20 January 2020; Correspondence Address: Lehnebach, R.; Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier, CNRS, 860 rue de St. Priest, France; email: lehnebach.romain@hotmail.fr Approved no  
  Call Number EcoFoG @ webmaster @ Serial 913  
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Author (down) Lehnebach, R.; Bossu, J.; Va, S.; Morel, H.; Amusant, N.; Nicolini, E.; Beauchene, J. pdf  url
doi  openurl
  Title Wood density variations of legume trees in French Guiana along the shade tolerance continuum: Heartwood effects on radial patterns and gradients Type Journal Article
  Year 2019 Publication Forests Abbreviated Journal Forests  
  Volume 10 Issue 2 Pages  
  Keywords French Guiana; Growth-mortality rate; Heartwood; Heartwood extractives; Legumes; Sapwood; Shade tolerance; Tropical tree species; Wood density variations  
  Abstract Increasing or decreasing wood density (WD) from pith to bark is commonly observed in tropical tree species. The different types of WD radial variations, long been considered to depict the diversity of growth and mechanical strategies among forest guilds (heliophilic vs. shade-tolerant), were never analyzed in the light of heartwood (HW) formation. Yet, the additional mass of chemical extractives associated to HW formation increases WD and might affect both WD radial gradient (i.e., the slope of the relation between WD and radial distance) and pattern (i.e., linear or nonlinear variation). We studied 16 legumes species from French Guiana representing a wide diversity of growth strategies and positions on the shade-tolerance continuum. Using WD measurements and available HW extractives content values, we computed WD corrected by the extractive content and analyzed the effect of HW on WD radial gradients and patterns. We also related WD variations to demographic variables, such as sapling growth and mortality rates. Regardless of the position along the shade-tolerance continuum, correcting WD gradients reveals only increasing gradients. We determined three types of corrected WD patterns: (1) the upward curvilinear pattern is a specific feature of heliophilic species, whereas (2) the linear and (3) the downward curvilinear patterns are observed in both mid- and late-successional species. In addition, we found that saplings growth and mortality rates are better correlated with the corrected WD at stem center than with the uncorrected value: taking into account the effect of HW extractives on WD radial variations provides unbiased interpretation of biomass accumulation and tree mechanical strategies. Rather than a specific feature of heliophilic species, the increasing WD gradient is a shared strategy regardless of the shade tolerance habit. Finally, our study stresses to consider the occurrence of HW when using WD.  
  Address Ecology of Guianan Forests (EcoFoG), AgroParisTech, French Agricultural Research and International Cooperation Organization (CIRAD), French National Centre for Scientific Research (CNRS), French National Institute for Agricultural Research (INRA), Université des Antilles, Université de Guyane, Kourou, French Guiana, 97310, France  
  Corporate Author Thesis  
  Publisher Mdpi Ag Place of Publication Editor  
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  ISSN 19994907 (Issn) ISBN Medium  
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  Notes Export Date: 1 February 2019; Correspondence Address: Lehnebach, R.; Laboratory of Botany and Modeling of Plant Architecture and Vegetation (AMAP), French Agricultural Research and International Cooperation Organization (CIRAD)France; email: romain.lehnebach@cirad.fr; Funding details: Agence Nationale de la Recherche, ANR; Funding details: Federación Española de Enfermedades Raras, FEDER; Funding text 1: The authors thank Grégoire Vincent, Jean-François Molino, and Daniel Sabatier for providing demographical data.). The French Agricultural Research Centre for International Development (CIRAD) funded Romain Lehnebach PhD scholarship. This research project was also funded by the European Regional Development Fund (FEDER, no 31703) and benefits from an 'Investissements d'Avenir' grant managed by the French National Research Agency (CEBA, ref. ANR-10-LABX-25-01).; References: Kollmann, F.F.P., Côté, W.A., (1984) Principles of Wood Science and Technology: I Solid Wood, , Springer: Berlin, Germany; Muller-Landau, H.C., Interspecific and inter-site variation in wood specific gravity of tropical trees (2004) Biotropica, 36, pp. 20-32; Van Gelder, H.A., Poorter, L., Sterck, F.J., Wood mechanics, allometry, and life-history variation in a tropical rain forest tree community (2006) New Phyt, 171, pp. 367-378; Chave, J., Coomes, D., Jansen, S., Lewis, S.L., Swenson, N.G., Zanne, A.E., Towards a worldwide wood economics spectrum (2009) Ecol. Lett, 12, pp. 351-366; Wright, S.J., Kitajima, K., Kraft, N.J.B., Reich, P.B., Wright, I.J., Bunker, D.E., Condit, R., Díaz, S., Functional traits and the growth-mortality trade-off in tropical trees (2010) Ecology, 91, pp. 3664-3674; Niklas, K.J., Influence of tissue density-specific mechanical properties on the scaling of plant height (1993) Ann. 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