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Author Koponen, P.; Nygren, P.; Domenach, A.M.; Le Roux, C.; Saur, E.; Roggy, J.C. openurl 
  Title Nodulation and dinitrogen fixation of legume trees in a tropical freshwater swamp forest in French Guiana Type Journal Article
  Year 2003 Publication Journal of Tropical Ecology Abbreviated Journal J. Trop. Ecol.  
  Volume (down) 19 Issue Pages 655-666  
  Keywords acetylene reduction assay; Bradyrhizobium; flooding; microtopography; N-15 natural abundance method; 16S rDNA sequencing  
  Abstract Nodulated legume trees comprised 43% of the stand basal area in the low, most frequently flooded microsites, and 23% in higher, drier microsites in a tropical freshwater swamp forest in French Guiana. Dinitrogen fixation in Pterocarpus officinalis, Hydrochorea corymbosa and Inga pilosula was confirmed by acetylene reduction assay (ARA), presence of leghaemoglobin in nodules and the N-15 natural abundance method. The results for Zygia cataractae were inconclusive but suggested N-2 fixation in drier microsites. Nodulated Inga disticha had a N-15-to-N-14 ratio similar to non-N-2-fixing trees, but ARA indicated nitrogenase activity and leghaemoglobin was present in nodules. All bacterial strains were identified as Bradyrhizobium spp. according to the partial 16S rDNA sequences, and they were infective in vitro in the model species Macroptilium atropurpuretan. About 35-50% of N in the leaves of P. officinalis, H. corymbosa and I. pilosula was fixed from the atmosphere. Dinitrogen fixation was estimated to contribute at least 8-13% and 1728% to whole-canopy N in high and low microsites, respectively. Symbiotic N, fixation appears to provide both a competitive advantage to legume trees under N-limited, flooded conditions and an important N input to neotropical freshwater swamp forests.  
  Address Univ Helsinki, Dept Forest Ecol, FIN-00014 Helsinki, Finland  
  Corporate Author Thesis  
  Publisher CAMBRIDGE UNIV PRESS Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0266-4674 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000186710800005 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 242  
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Author Blanc, L.; Dick, J.M. openurl 
  Title Errors in repeated measurements of soil water content in pots using a ThetaProbe Type Journal Article
  Year 2003 Publication Soil Use and Management Abbreviated Journal Soil Use Manage.  
  Volume (down) 19 Issue 1 Pages 87-88  
  Keywords measurement; soil water content; probes  
  Abstract The accuracy of a ThetaProbe (Delta-T Devices Ltd, UK) to obtain repeated measures of soil water content in pot plants was tested. This alternative to balance determinations led to a large underestimation of water content, varying from 12.2 to 21.8% of the total water content, depending on soil type.  
  Address Ctr Ecol & Hydrol Edinburgh, Penicuik EH26 0QB, Midlothian, Scotland  
  Corporate Author Thesis  
  Publisher C A B I PUBLISHING Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0266-0032 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000181552000013 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 247  
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Author Almeras, T.; Thibaut, A.; Gril, J. openurl 
  Title Effect of circumferential heterogeneity of wood maturation strain, modulus of elasticity and radial growth on the regulation of stem orientation in trees Type Journal Article
  Year 2005 Publication Trees-Structure and Function Abbreviated Journal Trees-Struct. Funct.  
  Volume (down) 19 Issue 4 Pages 457-467  
  Keywords biomechanics; reaction wood; maturation strain; Young's modulus; eccentricity  
  Abstract Active mechanisms of re-orientation are necessary to maintain the verticality of tree stems. They are achieved through the production of reaction wood, associated with circumferential variations of three factors related to cambial activity: maturation strain, longitudinal modulus of elasticity (MOE) and eccentric growth. These factors were measured on 17 mature trees from different botanical families and geographical locations. Various patterns of circumferential variation of these factors were identified. A biomechanical analysis based on beam theory was performed to quantify the individual impact of each factor. The main factor of re-orientation is the circumferential variation of maturation strains. However, this factor alone explains only 57% of the re-orientations. Other factors also have an effect through their interaction with maturation strains. Eccentric growth is generally associated with heterogeneity of maturation strains, and has an important complementary role, by increasing the width of wood with high maturation strain. Without this factor, the efficiency of re-orientations would be reduced by 31% for angiosperms and 26% for gymnosperms. In the case of angiosperms, MOE is often larger in tension wood than in normal wood. Without these variations, the efficiency of re-orientations would be reduced by 13%. In the case of gymnosperm trees, MOE of compression wood is lower than that of normal wood, so that re-orientation efficiency would be increased by 24% without this factor of variations.  
  Address Nagoya Univ, Lab Biomat Phys, Dept Bioagr Sci, Nagoya, Aichi 4648601, Japan, Email: t_almeras@hotmail.com  
  Corporate Author Thesis  
  Publisher SPRINGER Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0931-1890 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000229890700012 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 253  
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Author 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 (down) 19 Issue 1 Pages 51-65  
  Keywords  
  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 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 (down) 19 Issue Pages 43-51  
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  Call Number EcoFoG @ webmaster @ Serial 523  
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Author 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 (down) 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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Author Dejean, A.; Corbara, B.; Roux, O.; Orivel, J. url  openurl
  Title The antipredatory behaviours of neotropical ants towards army ant raids (Hymenoptera: Formicidae) Type Journal Article
  Year 2014 Publication Myrmecological News Abbreviated Journal Myrmecological News  
  Volume (down) 19 Issue Pages 17-24  
  Keywords Antipredatory behaviour; Army ants; Ecitoninae; Prey-ant species  
  Abstract Group hunting, nomadism, wingless queens and colony fission characterize army ants, allowing them to have become the main tropical arthropod predators, mostly of other social insects. We studied the reactions of different ant species to the New World army ants Eciton burchellii (WESTWOOD, 1842) and E. hamatum (FABRICIUS, 1782) (Ecitoninae). We compiled our results with those already known in a synthetic appendix. A wide range of ant species react to the ap-proach of army ant raids by evacuating their nests with several workers transporting brood. The Eciton plunder a large part of the brood but rarely kill workers or queens, so that the latter return to their nest and resume colony activity. One exception is Paratrechina longicornis (LATREILLE, 1802) colonies that quickly evacuate their nest, so that the entire col-ony can generally escape a raid. Another is Leptogenys mexicana (MAYR, 1870) that leave their nests in columns while some nestmates resist the attack; they therefore lose only a few larvae. We noted that colonies can avoid being raided if the army ants ignore them (Atta cephalotes (LINNAEUS, 1758)), or if the workers produce a repellent substance (Azteca associated with myrmecophytic Cecropia) or are repellent themselves (Pachycondyla villosa (FABRICIUS, 1804), Ec-tatomma spp.). In the other cases, a part of the brood is lost. When an Eciton raid approached the base of their host-tree trunk, Azteca andreae GUERRERO, DELABIE and DEJEAN, 2010 workers dropped a part of their brood on the ground. While numerous Eciton workers were gathering up this brood, the front of the column advanced, so that the Azteca andreae nests were not plundered. Pheidole megacephala (FABRICIUS, 1793) nests were partly plundered as the workers reacted aggressively, blocking the Eciton inside their nests during a long time. When the latter returned toward their bivouac, they were attacked and killed by their nestmates whether or not they had retrieved Pheidole brood. Consequently, the front of the column turned away from the Pheidole nest.  
  Address Maladies Infectieuses et Vecteurs, Evolution et Contrôle (UMR- IRD 224) Équipe BEES, IRD 01, BP 171 Bobo-Dioulasso, Burkina Faso  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 19944136 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 10 March 2014; Source: Scopus; Language of Original Document: English; Correspondence Address: Dejean, A.; Écologie des Forêts de Guyane (UMR-CNRS 8172), Campus agronomique, BP 316, 97379 Kourou cedex, France; email: alain.dejean@wanadoo.fr Approved no  
  Call Number EcoFoG @ webmaster @ Serial 535  
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Author Baraloto, C.; Alverga, P.; Quispe, S.B.; Barnes, G.; Chura, N.B.; Da Silva, I.B.; Castro, W.; Da Souza, H.; De Souza Moll, I.; Del Alcazar Chilo, J.; Linares, H.D.; Quispe, J.G.; Kenji, D.; Medeiros, H.; Murphy, S.; Rockwell, C.A.; Shenkin, A.; Silveira, M.; Southworth, J.; Vasquez, G.; Perz, S. pdf  url
openurl 
  Title Trade-offs among forest value components in community forests of southwestern Amazonia Type Journal Article
  Year 2014 Publication Ecology and Society Abbreviated Journal Ecology and Society  
  Volume (down) 19 Issue 4 Pages 56  
  Keywords Açai; Biodiversity conservation; Brazil nut; Carbon stocks; Livelihood; Ntfp; Redd; Rubber; Timber; Tropical rainforest  
  Abstract Contemporary conservation interventions must balance potential trade-offs between multiple ecosystem services. In tropical forests, much attention has focused on the extent to which carbon-based conservation provided by REDD+ policies can also mitigate biodiversity conservation. In the nearly one-third of tropical forests that are community owned or managed, conservation strategies must also balance the multiple uses of forest products that support local livelihoods. Although much discussion has focused on policy options, little empirical evidence exists to evaluate the potential for trade-offs among different tropical forest value components. We assessed multiple components of forest value, including tree diversity, carbon stocks, and both timber and nontimber forest product resources, in forest communities across the trinational frontier of Brazil, Peru, and Bolivia. We installed 69 0.5-ha vegetation plots in local communities, and we characterized 15 components of forest value for each plot. Principal components analyses revealed two major axes of forest value, the first of which defined a trade-off between diversity of woody plant communities (taxonomic and functional) versus aboveground biomass and standing timber volume. The second axis described abundance of commercial species, with strong positive loadings for density of timber and nontimber forest products, including Brazil nut (Bertholletia excelsa) and copaiba oil (Copaifera spp.). The observed trade-off between different components of forest value suggests a potential for management conflicts prioritizing biodiversity conservation versus carbon stocks in the region. We discuss the potential for integrative indices of forest value for tropical forest conservation.  
  Address Department of Sociology and Criminology and Law, University of Florida, United States  
  Corporate Author Thesis  
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  Notes Export Date: 23 March 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 589  
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Author Fortunel, C.; Paine, C.E.T.; Fine, P.V.A.; Mesones, I.; Goret, J.; Burban, B.; Cazal, J.; Baraloto, C.; Comita, L. pdf  url
doi  openurl
  Title There's no place like home: seedling mortality contributes to the habitat specialisation of tree species across Amazonia Type Journal Article
  Year 2016 Publication Ecology Letters Abbreviated Journal Ecology Letters  
  Volume (down) 19 Issue 10 Pages 1256-1266  
  Keywords Amazon basin; forests habitats; habitat association; herbivory; light availability; plant lineages; rainfall temporal variation; seedling performance; soil fertility; tropical trees  
  Abstract Understanding the mechanisms generating species distributions remains a challenge, especially in hyperdiverse tropical forests. We evaluated the role of rainfall variation, soil gradients and herbivory on seedling mortality, and how variation in seedling performance along these gradients contributes to habitat specialisation. In a 4-year experiment, replicated at the two extremes of the Amazon basin, we reciprocally transplanted 4638 tree seedlings of 41 habitat-specialist species from seven phylogenetic lineages among the three most important forest habitats of lowland Amazonia. Rainfall variation, flooding and soil gradients strongly influenced seedling mortality, whereas herbivory had negligible impact. Seedling mortality varied strongly among habitats, consistent with predictions for habitat specialists in most lineages. This suggests that seedling performance is a primary determinant of the habitat associations of adult trees across Amazonia. It further suggests that tree diversity, currently mostly harboured in terra firme forests, may be strongly impacted by the predicted climate changes in Amazonia. © 2016 John Wiley & Sons Ltd/CNRS  
  Address Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA, United States  
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  Notes Export Date: 27 October 2016 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 698  
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Author Leroy, C.; Petitclerc, F.; Orivel, J.; Corbara, B.; Carrias, J.-F.; Dejean, A.; Céréghino, R. doi  openurl
  Title The influence of light, substrate and seed origin on the germination and establishment of an ant-garden bromeliad Type Journal Article
  Year 2017 Publication Plant Biology Abbreviated Journal Plant Biol J  
  Volume (down) 19 Issue 1 Pages 70-78  
  Keywords Aechmea mertensii; bromeliad; French Guiana; germination; plant performance; survival  
  Abstract Plant germination and development depend upon a seed's successful dispersal into a suitable habitat and its ability to grow and survive within the surrounding biotic and abiotic environment. The seeds of Aechmea mertensii, a tank-bromeliad species, are dispersed by either Camponotus femoratus or Neoponera goeldii, two ant species that initiate ant gardens (AGs). These two mutualistic ant species influence the vegetative and reproductive traits of the bromeliad through their divergent ecological preferences (i.e. light and substrate). We hypothesised that the seeds dispersed by these two ant species have underlying genetic differences affecting germination, growth and survival of A. mertensii seedlings in different ways. To test this, we used an experimental approach consisting of sowing seeds of A. mertensii: (i) taken from the two AG–ant associations (i.e. seed origin), (ii) in two contrasting light conditions, and (iii) on three different substrates. Light and substrate had significant effects on germination, survival and on eight key leaf traits reflecting plant performance. Seed origin had a significant effect only on germination and on two leaf traits (total dry mass and relative growth rate). Overall, this bromeliad performs better (i.e. high growth and survival rates) when growing both in the shade and in the carton nest developed by C. femoratus ants. These results suggest that the plasticity of the tank bromeliad A. mertensii is mainly due to environment but also to genetic differences related to seed origin, as some traits are heritable. Thus, these two ant species may play contrasting roles in shaping plant evolution and speciation.  
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  ISSN 1438-8677 ISBN Medium  
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  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 712  
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