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Author Gonzalez, M.A.; Roger, A.; Courtois, E.A.; Jabot, F.; Norden, N.; Paine, C.E.T.; Baraloto, C.; Thebaud, C.; Chave, J.
Title Shifts in species and phylogenetic diversity between sapling and tree communities indicate negative density dependence in a lowland rain forest Type Journal Article
Year 2010 Publication Journal of Ecology Abbreviated Journal J. Ecol.
Volume 98 Issue 1 Pages (down) 137-146
Keywords APG II plus rbcL megatree; density dependence; DNA barcoding; French Guiana; phylogenetic diversity; species diversity; tropical plant communities
Abstract P>1. As trees in a given cohort progress through ontogeny, many individuals die. This risk of mortality is unevenly distributed across species because of many processes such as habitat filtering, interspecific competition and negative density dependence. Here, we predict and test the patterns that such ecological processes should inscribe on both species and phylogenetic diversity as plants recruit from saplings to the canopy. 2. We compared species and phylogenetic diversity of sapling and tree communities at two sites in French Guiana. We surveyed 2084 adult trees in four 1-ha tree plots and 943 saplings in sixteen 16-m2 subplots nested within the tree plots. Species diversity was measured using Fisher's alpha (species richness) and Simpson's index (species evenness). Phylogenetic diversity was measured using Faith's phylogenetic diversity (phylogenetic richness) and Rao's quadratic entropy index (phylogenetic evenness). The phylogenetic diversity indices were inferred using four phylogenetic hypotheses: two based on rbcLa plastid DNA sequences obtained from the inventoried individuals with different branch lengths, a global phylogeny available from the Angiosperm Phylogeny Group, and a combination of both. 3. Taxonomic identification of the saplings was performed by combining morphological and DNA barcoding techniques using three plant DNA barcodes (psbA-trnH, rpoC1 and rbcLa). DNA barcoding enabled us to increase species assignment and to assign unidentified saplings to molecular operational taxonomic units. 4. Species richness was similar between saplings and trees, but in about half of our comparisons, species evenness was higher in trees than in saplings. This suggests that negative density dependence plays an important role during the sapling-to-tree transition. 5. Phylogenetic richness increased between saplings and trees in about half of the comparisons. Phylogenetic evenness increased significantly between saplings and trees in a few cases (4 out of 16) and only with the most resolved phylogeny. These results suggest that negative density dependence operates largely independently of the phylogenetic structure of communities. 6. Synthesis. By contrasting species richness and evenness across size classes, we suggest that negative density dependence drives shifts in composition during the sapling-to-tree transition. In addition, we found little evidence for a change in phylogenetic diversity across age classes, suggesting that the observed patterns are not phylogenetically constrained.
Address [Gonzalez, Mailyn A.; Roger, Aurelien; Courtois, Elodie A.; Jabot, Franck; Norden, Natalia; Thebaud, Christophe; Chave, Jerome] Univ Toulouse 3, Lab Evolut & Diversite Biol, UMR 5174, CNRS, F-31062 Toulouse, France, Email: gonzalez.mailyn@gmail.com
Corporate Author Thesis
Publisher WILEY-BLACKWELL PUBLISHING, INC Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0022-0477 ISBN Medium
Area Expedition Conference
Notes ISI:000272657400015 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 88
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Author Ciminera, M.; Auger-Rozenberg, M.-A.; Caron, H.; Herrera, M.; Scotti-Saintagne, C.; Scotti, I.; Tysklind, N.; Roques, A.
Title Genetic Variation and Differentiation of Hylesia metabus (Lepidoptera: Saturniidae): Moths of Public Health Importance in French Guiana and in Venezuela Type Journal Article
Year 2019 Publication Journal of medical entomology Abbreviated Journal J. Med. Entomol.
Volume 56 Issue 1 Pages (down) 137-148
Keywords
Abstract Hylesia moths impact human health in South America, inducing epidemic outbreaks of lepidopterism, a puriginous dermatitis caused by the urticating properties of females' abdominal setae. The classification of the Hylesia genus is complex, owing to its high diversity in Amazonia, high intraspecific morphological variance, and lack of interspecific diagnostic traits which may hide cryptic species. Outbreaks of Hylesia metabus have been considered responsible for the intense outbreaks of lepidopterism in Venezuela and French Guiana since the C20, however, little is known about genetic variability throughout the species range, which is instrumental for establishing control strategies on H. metabus. Seven microsatellites and mitochondrial gene markers were analyzed from Hylesia moths collected from two major lepidopterism outbreak South American regions. The mitochondrial gene sequences contained significant genetic variation, revealing a single, widespread, polymorphic species with distinct clusters, possibly corresponding to populations evolving in isolation. The microsatellite markers validated the mitochondrial results, and suggest the presence of three populations: one in Venezuela, and two in French Guiana. All moths sampled during outbreak events in French Guiana were assigned to a single coastal population. The causes and implications of this finding require further research.
Address INRA, Unité de Recherche Ecologie des forêts méditerranéennes, Avignon, UR629, France
Corporate Author Thesis
Publisher NLM (Medline) Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 19382928 (Issn) ISBN Medium
Area Expedition Conference
Notes Export Date: 1 February 2019 Approved no
Call Number EcoFoG @ webmaster @ Serial 857
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Author Van Langenhove, Leandro ; Verryckt, Lore T. ; Stahl, Clement ; Courtois, Elodie A. ; Urbina, Ifigenia ; Grau, Oriol ; Asensio, Dolores ; Peguero, Guille ; Margalef, Olga ; Freycon, Vincent ; Penuelas, Josep ; Janssens, Ivan A.
Title Soil nutrient variation along a shallow catena in Paracou, French Guiana Type Journal Article
Year 2021 Publication Soil Research Abbreviated Journal
Volume 59 Issue 2 Pages (down) 130
Keywords French Guiana, lowland tropical forest, Paracou, phosphorus, topography, water drainage.
Abstract Tropical forests are generally considered to stand upon nutrient-poor soils, but soil nutrient concentrations and availabilities can vary greatly at local scale due to topographic effects on erosion and water drainage. In this study we physically and chemically characterised the soils of 12 study plots situated along a catena with a shallow slope in a tropical rainforest in French Guiana both during the wet and the dry season to evaluate seasonal differences. Soils along the catena were all Acrisols, but differed strongly in their water drainage flux. Over time, this differential drainage has led to differences in soil texture and mineral composition, affecting the adsorption of various nutrients, most importantly phosphorus. The more clayey soils situated on the slope of the catena had higher total concentrations of carbon, nitrogen, phosphorus and several micronutrients, while extractable nutrient concentrations were highest in the sandiest soils situated at the bottom of the catena. We found that carbon, nitrogen and extractable nutrients all varied seasonally, especially in the surface soil layer. These results are interesting because they show that, even at the local scale, small differences in topography can lead to large heterogeneity in nutrient concentrations, which can have large impacts on plant and microbial community organisation at the landscape level.
Address
Corporate Author Thesis
Publisher CSIRO Publishing Place of Publication Editor
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Notes Approved no
Call Number EcoFoG @ webmaster @ Serial 1042
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Author Odonne, G.; Valadeau, C.; Alban-Castillo, J.; Stien, D.; Sauvain, M.; Bourdy, G.
Title Medical ethnobotany of the Chayahuita of the Paranapura basin (Peruvian Amazon) Type Journal Article
Year 2013 Publication Journal of Ethnopharmacology Abbreviated Journal J. Ethnopharmacol.
Volume 146 Issue 1 Pages (down) 127-153
Keywords Amazon; Chayahuita; Medicinal plant; Peru; Pharmacopeia; Traditional medicine
Abstract Ethnopharmacological relevance: Up until now, the plant pharmacopoeia of the Chayahuita, an ethnic group from the Peruvian Amazon, has been poorly defined. This paper details the uses of medicinal plants within this community, as recorded in two villages of the Paranapura basin, Soledad and Atahualpa de Conchiyacu. This study aimed to describe the basis of the Chayahuita traditional medical system, to document part of the medicinal plant corpus, and to compare it with data from other Amazonian ethnic groups. Material and methods: Methodology was based (i) on field prospection with 26 informants (ethnobotanical walks methodology), (ii) semi-structured interviews including 93 people (49 men and 44 women) focused on the most recent health problem experienced and on the therapeutic options chosen, (iii) individual or group thematic discussions relating to disease and treatments, (iv) 6-months of participants' observations between May 2007 and May 2008. At the end of the project in May 2008 a workshop was organized to cross-check the data with the help of 12 of the most interested informants. Results: Six hundred and seventeen voucher specimens were collected, corresponding to 303 different species, from which 274 (belonging to 83 families) are documented here. Altogether 492 recipes were recorded, corresponding to a global figure of 541 therapeutic uses and a total of 664 use reports. The main therapeutic uses are related to dermatological problems (103 uses; 19%), gastro-intestinal complaints (69 uses; 13%) and malaria/fevers (52 uses; 10%). Diseases are analysed according to Chayahuita concepts, and for each disease the species having a high frequency of citation are listed, and the most frequently used remedies are described. Whenever possible, comparisons with other Amazonian groups have been drawn. Conclusion: Chayahuita nosology and medical ethnobotany appear to draw their inspiration from a common panamazonian root. Despite the fact that a certain number of medicinal plants are shared with other nearby groups, there seem to be specific uses for some species, thus highlighting the originality of the Chayahuita pharmacopoeia. Presently there is a certain disinterest in the most traditional area of the Chayahuita medical ways, and the role of the penutu (shaman) seems to be less highly-valued than in the past. Nonetheless, the use of medicinal plants in phytotherapeutic treatment is very much a living, shared knowledge. © 2012 Elsevier Ireland Ltd. All rights reserved.
Address Université de Toulouse, Université Paul Sabatier, Faculté de Pharmacie, 35 Chemin des maraîchers, F-31062, Toulouse Cedex 9, France
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 03788741 (Issn) ISBN Medium
Area Expedition Conference
Notes Export Date: 6 March 2013; Source: Scopus; Coden: Joetd; doi: 10.1016/j.jep.2012.12.014; Language of Original Document: English; Correspondence Address: Odonne, G.; CNRS Guyane, USR 3456, 2 av. Gustave Charlery, 97300 Cayenne, France; email: guillaume.odonne@gmail.com Approved no
Call Number EcoFoG @ webmaster @ Serial 473
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Author Rivalland, C.; Madhkour, S.; Salvin, P.; Robert, F.
Title Electrochemical and microbial monitoring of multi-generational electroactive biofilms formed from mangrove sediment Type Journal Article
Year 2015 Publication Bioelectrochemistry Abbreviated Journal Bioelectrochemistry
Volume 106 Issue Pages (down) 125-132
Keywords Dissimilarity; High-throughput sequencing; Mes; Microbial diversity; Syntrophism
Abstract Electroactive biofilms were formed from French Guiana mangrove sediments for the analysis of bacterial communities' composition. The electrochemical monitoring of three biofilm generations revealed that the bacterial selection occurring at the anode, supposedly leading microbial electrochemical systems (MESs) to be more efficient, was not the only parameter to be taken into account so as to get the best electrical performance (maximum current density). Indeed, first biofilm generations produced a stable current density reaching about 18A/m2 while second and third generations produced current densities of about 10A/m2. MES bacterial consortia were characterized thanks to molecular biology techniques: DGGE and MiSeq® sequencing (Illumina®). High-throughput sequencing data statistical analysis confirmed preliminary DGGE data analysis, showing strong similarities between electroactive biofilms of second and third generations, but also revealing both selection and stabilization of the biofilms. © 2015 Elsevier B.V.
Address Laboratoire des Matériaux et Molécules en Milieu Amazonien, UAG-UMR EcoFoG, 2091 route de Baduel, Campus TrouBiran, Cayenne, Guyane Française, France
Corporate Author Thesis
Publisher Place of Publication Editor
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Notes Export Date: 11 September 2015 Approved no
Call Number EcoFoG @ webmaster @ Serial 622
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Author Dejean, A.; Petitclerc, F.; Compin, A.; Azémar, F.; Corbara, B.; Delabie, J.H.C.; Leroy, C.
Title Hollow internodes permit a neotropical understory plant to shelter multiple mutualistic ant species, obtaining protection and nutrient provisioning (myrmecotrophy) Type Journal Article
Year 2017 Publication American Naturalist Abbreviated Journal American Naturalist
Volume 190 Issue 5 Pages (down) E124-E131
Keywords Ant-plant relationships; Biotic protection; Mutualism; Myrmecotrophy; Stable isotopes; Tachia guianensis
Abstract The Neotropical understory plant Tachia guianensis (Gentianaceae)- known to shelter the colonies of several ant species in its hollow trunks and branches-does not provide them with food rewards (e.g., extrafloral nectar). We tested whether these ants are opportunistic nesters or whether mutualistic relationships exist as for myrmecophytes or plants sheltering ant colonies in specialized hollow structures in exchange for protection from enemies and/or nutrient provisioning (myrmecotrophy). We noted 37 ant species sheltering inside T. guianensis internodes, three of them accounting for 43.5% of the cases. They protect their host plants from leaf-cutting ant defoliation and termite damage because individuals devoid of associated ants suffered significantly more attacks. Using the stable isotope 15N, we experimentally showed that the tested ant species furnish their host plants with nutrients. Therefore, a mutualism exists. However, because it is associated with numerous ant species, T. guianensis can be considered a nonspecialized myrmecophyte. © 2017 by The University of Chicago.
Address Institut de Recherche pour le Développement, UMR botAnique et Modélisation de l’Archtecture des Plantes et des Végétations, Cirad, CNRS, INRA, Université de Montpellier, Boulevard de la Lironde, TA A-51/PS2, Montpellier cedex 5, Brazil
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
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Notes Export Date: 2 November 2017 Approved no
Call Number EcoFoG @ webmaster @ Serial 768
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Author Robillard, T.; ter Hofstede, H.M.; Orivel, J.; Vicente, N.M.
Title Bioacoustics of the Neotropical Eneopterinae (Orthoptera, Grylloidea, Gryllidae) Type Journal Article
Year 2015 Publication Bioacoustics Abbreviated Journal Bioacoustics
Volume 24 Issue 2 Pages (down) 123-143
Keywords
Abstract In members of the cricket subfamily Eneopterinae (Orthoptera, Grylloidea), songs with powerful high-frequency (HF) harmonics have evolved, which likely represents a distinctive acoustic adaptation. In this study, we analysed or reanalysed the songs of the three eneopterine genera present in the Neotropics to evaluate whether they also possess high-amplitude HF components. We present new data and combine several lines of evidence to interpret or reinterpret the calling signals of a representative species for each genus. We used new recordings in order to detect and analyse potential HF components of the songs. Stridulatory files were measured, and stridulation was studied using high-speed video recordings. The results suggest that all eneopterine genera from the Neotropics use HFs to communicate, based on the rich harmonic content of their songs. Strikingly, the Neotropical eneopterines possess high dominant frequencies, recalling the patterns observed in the tribe Lebinthini, the most speciose tribe of the subfamily distributed in the Western Pacific region and in Southeast Asia: Ligypterus and Ponca show dominant harmonic peaks, whereas Eneoptera possesses unique features. The three species under study, however, deal differently with HFs.
Address
Corporate Author Thesis
Publisher Taylor & Francis Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0952-4622 ISBN Medium
Area Expedition Conference
Notes doi: 10.1080/09524622.2014.996915 Approved no
Call Number EcoFoG @ webmaster @ Serial 651
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Author Le Guen, V.; Rodier-Goud, M.; Troispoux, V.; Xiong, T.C.; Brottier, P.; Billot, C.; Seguin, M.
Title Characterization of polymorphic microsatellite markers for Microcyclus ulei, causal, agent of South American leaf blight of rubber trees Type Journal Article
Year 2004 Publication Molecular Ecology Notes Abbreviated Journal Mol. Ecol. Notes
Volume 4 Issue 1 Pages (down) 122-124
Keywords Hevea brasiliensis; Microcyclus ulei; microsatellite markers; phytopathogenic fungi; South American leaf blight
Abstract South American leaf blight caused by the ascomycete Microcyclus Wei is the most harmful disease of the rubber tree in Latin America and a potential threat to Asiatic and African natural rubber production. Until now, the variability of this fungus was assessed through observation of pathogenicity of isolates on a range of rubber tree clones with known resistance reactions. The present study describes the process used to design 11 microsatellite markers and evaluates their usefulness in detecting genetic polymorphism. Nine of these markers were polymorphic among six isolates from Brazil (with two to three alleles per locus) and five markers were polymorphic among four isolates from French Guiana (with two to four alleles per locus).
Address CIRAD, F-97387 Kourou, France, Email: vincent.le_guen@cirad.fr
Corporate Author Thesis
Publisher BLACKWELL PUBLISHING LTD Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1471-8278 ISBN Medium
Area Expedition Conference
Notes ISI:000189159500037 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 265
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Author Servigne, P.; Orivel, J.; Azémar, F.; Carpenter, J.; Dejean, A.; Corbara, B.
Title An uneasy alliance: a nesting association between aggressive ants and equally fierce social wasps Type Journal Article
Year 2020 Publication Insect Science Abbreviated Journal Insect Science
Volume 27 Issue 1 Pages (down) 122-132
Keywords Azteca chartifex ants; interspecific association; mutualism; Polybia rejecta wasps; scent trail erasure
Abstract Although the Neotropical territorially dominant arboreal ant Azteca chartifex Forel is very aggressive towards any intruder, its populous colonies tolerate the close presence of the fierce polistine wasp Polybia rejecta (F.).
In French Guiana, 83.33% of the 48 P. rejecta nests recorded were found side by side with those of A. chartifex. This nesting association results in mutual protection from predators (i.e., the wasps protected from army ants; the ants protected from birds).
We conducted field studies, laboratory-based behavioral experiments and chemical analyses to elucidate the mechanisms allowing the persistence of this association. Due to differences in the cuticular profiles of the two species, we eliminated the possibility of chemical mimicry.
Also, analyses of the carton nests did not reveal traces of marking on the envelopes. Because ant forager flows were not perturbed by extracts from the wasps' Dufour's and venom glands, we rejected any hypothetical action of repulsive chemicals. Nevertheless, we noted that the wasps 'scraped' the surface of the upper part of their nest envelope using their mandibles, likely removing the ants' scent trails, and an experiment showed that ant foragers were perturbed by the removal of their scent trails. This leads us to use the term 'erasure hypothesis'. Thus, this nesting association persists thanks to a relative tolerance by the ants towards wasp presence and the behavior of the wasps that allows them to 'contain' their associated ants through the elimination of their scent trails, direct attacks, 'wing-buzzing' behavior and ejecting the ants.
Address
Corporate Author Thesis
Publisher John Wiley & Sons, Ltd (10.1111) Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1672-9609 ISBN Medium
Area Expedition Conference
Notes doi: 10.1111/1744-7917.12597 Approved no
Call Number EcoFoG @ webmaster @ Serial 885
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Author Bompy, F.; Imbert, D.; Dulormne, M.
Title Impact patterns of soil salinity variations on the survival rate, growth performances, and physiology of Pterocarpus officinalis seedlings Type Journal Article
Year 2015 Publication Trees – Structure and Function Abbreviated Journal Trees – Structure and Function
Volume 29 Issue 1 Pages (down) 119-128
Keywords Acclimation; Leaf chemical composition; Leaf gas exchange; NaCl salinity; Tropical swamp forest; Vegetative growth
Abstract Key message: Pterocarpus officinalisis able to (1) improve its acclimation capacity if soil salinity increases slowly and (2) benefit from afreshwater episode.
Abstract: One likely effect of global change is an increase of the amplitude of salt variations in the soil of brackish coastal wetland forests. In the Antilles, such forests are dominated by the species Pterocarpus officinalis. The study aimed to determine the effect of 3 salinity levels (freshwater, moderate, and hypersalinity—i.e., 0, 10, and 30 ‰, respectively) and 3 patterns of salinity variation (fast or slow salinity increase, fluctuating salinity) on the growth and ecophysiology of P. officinalis seedlings. P. officinalis proved tolerant to 10 ‰ salinity, even if at this salt concentration the water constraint altered the plant’s water status and reduced stomatal conductance. No impact of the pattern of salinity variation was observed at 10 ‰. Seedlings were strongly affected by hypersalinity, but were able to acclimatize efficiently and to improve their performances (higher survival, total biomass, and photosynthesis) when salinity increased slowly. Young P. officinalis were also able to take advantage of a freshwater episode on the longer term, certainly through leaf desalination associated with enhanced photosynthesis and water use efficiency. Higher soil salinity and more intense dry seasons in the context of climate change could affect the stand-level regeneration potential of P. officinalis seedlings. © 2014, Springer-Verlag Berlin Heidelberg.
Address UMR ECOFOG-DYNECAR, UFR des Sciences Exactes et Naturelles, Université des Antilles et de la Guyane, Pointe-à-PitreGuadeloupe (F.W.I.), France
Corporate Author Thesis
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Notes Export Date: 9 April 2015 Approved no
Call Number EcoFoG @ webmaster @ Serial 595
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