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Author Faustin, M.; Maciuk, A.; Salvin, P.; Roos, C.; Lebrini, M.
Title Corrosion inhibition of C38 steel by alkaloids extract of Geissospermum laeve in 1M hydrochloric acid: Electrochemical and phytochemical studies Type Journal Article
Year 2015 Publication Corrosion Science Abbreviated Journal Corrosion Science
Volume (down) 92 Issue Pages 287-300
Keywords A. C38 steel; B. Eis; B. Sem; C. Acid corrosion; C. Anodic protection; C. Cathodic protection
Abstract Corrosion inhibition by alkaloids extract (AE) from Geissospermum laeve on C38 steel in 1. M HCl is investigated with electrochemical studies. Inhibition efficiency of 92% is reached with 100. mg/L of AE at 25. °C. Potentiodynamic polarization showed that the extract behaves as mixed-type inhibitors. The Nyquist plots showed that increasing AE concentration, charge-transfer resistance increased and double-layer capacitance decreased, involving increased inhibition efficiency. Adsorption of the inhibitor molecules corresponds to Langmuir adsorption isotherm. Immersion time and temperature effects were investigated using EIS and potentiodynamic polarization. SEM and EDX supported the adsorption conclusions. The active compound responsible for the corrosion inhibition is geissospermine.
Address Laboratoire de Pharmacognosie-Chimie des Substances Naturelles et Chimiotherapies Antiparasitaires, BioCIS, Université Paris-SudChâtenay-Malabry, France
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Notes Export Date: 6 February 2015 Approved no
Call Number EcoFoG @ webmaster @ Serial 584
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Author Cereghino, R.; Leroy, C.; Dejean, A.; Corbara, B.
Title Ants mediate the structure of phytotelm communities in an ant-garden bromeliad Type Journal Article
Year 2010 Publication Ecology Abbreviated Journal Ecology
Volume (down) 91 Issue 5 Pages 1549-1556
Keywords Aechmea mertensii; ant-gardens; biodiversity; bromeliads; Camponotus femoratus; Crematogaster levior; macroinvertebrates; mutualism; Pachycondyla goeldii; phytotelmata; secondary forest; Sinnamary; French Guiana; species interactions
Abstract The main theories explaining the biological diversity of rain forests often confer a limited understanding of the contribution of interspecific interactions to the observed patterns. We show how two-species mutualisms can affect much larger segments of the invertebrate community in tropical rain forests. Aechmea mertensii (Bromeliaceae) is both a phytotelm (plant-held water) and an ant-garden epiphyte. We studied the influence of its. associated ant species (Pachycondyla goeldii and Camponotus femoratus) on the physical characteristics of the plants, and, subsequently, on the diversity of the invertebrate communities that inhabit their tanks. As dispersal agents for the bromeliads, P. goeldii and C. femoratus influence the shape and size of the bromeliad by determining the location of the seedling, from exposed to partially shaded areas. By coexisting on a local scale, the two ant species generate a gradient of habitat conditions in terms of available resources (space and food) for aquatic invertebrates, the diversity of the invertebrate communities increasing with greater volumes of water and fine detritus. Two-species mutualisms are widespread in nature, but their influence on the diversity of entire communities remains largely unexplored. Because macroinvertebrates constitute an important part of animal production in all ecosystem types, further investigations should address the functional implications of such indirect effects.
Address [Cereghino, Regis] Univ Toulouse, UPS, INPT, Lab Ecol Fonct,EcoLab, F-31062 Toulouse, France, Email: cereghin@cict.fr
Corporate Author Thesis
Publisher ECOLOGICAL SOC AMER Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0012-9658 ISBN Medium
Area Expedition Conference
Notes ISI:000277867600030 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 59
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Author Clair, B.; Almeras, T.; Yamamoto, H.; Okuyama, T.; Sugiyama, J.
Title Mechanical behavior of cellulose microfibrils in tension wood, in relation with maturation stress generation Type Journal Article
Year 2006 Publication Biophysical Journal Abbreviated Journal Biophys. J.
Volume (down) 91 Issue 3 Pages 1128-1135
Keywords
Abstract A change in cellulose lattice spacing can be detected during the release of wood maturation stress by synchrotron x-ray diffraction experiment. The lattice strain was found to be the same order of magnitude as the macroscopic strain. The fiber repeat distance, 1.033 nm evaluated for tension wood after the release of maturation stress was equal to the conventional wood values, whereas the value before stress release was larger, corresponding to a fiber repeat of 1.035 nm, nearly equal to that of cotton and ramie. Interestingly, the fiber repeat varied from 1.033 nm for wood to 1.040 nm for algal cellulose, with an increasing order of lateral size of cellulose microfibrils so far reported. These lines of experiments demonstrate that, before the stress release, the cellulose was in a state of tension, which is, to our knowledge, the first experimental evidence supporting the assumption that tension is induced in cellulose microfibrils.
Address Kyoto Univ, Res Inst Sustainable Humanosphere, Uji, Kyoto, Japan, Email: sugiyama@rish.kyoto-u.ac.jp
Corporate Author Thesis
Publisher BIOPHYSICAL SOCIETY Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0006-3495 ISBN Medium
Area Expedition Conference
Notes ISI:000239086800039 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 224
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Author Gibernau, M.; Orivel, J.; Delabie, J.H.C.; Barabe, D.; Dejean, A.
Title An asymmetrical relationship between an arboreal ponerine ant and a trash-basket epiphyte (Araceae) RID D-4390-2009 RID C-4034-2011 Type Journal Article
Year 2007 Publication Biological Journal of the Linnean Society Abbreviated Journal Biol. J. Linnean Soc.
Volume (down) 91 Issue 3 Pages 341-346
Keywords hanging soil; mutualism; nest site selection; plant protection
Abstract The relationship between ants and Philodendron insigne, a trash-basket epiphyte abundant along streams, was studied in French Guiana. Only a few (3%) of the young plants sheltered ants, whereas 90% of the mature individuals did. The most frequent associate was Odontomachus hastatus (Fabricius), an arboreal ponerine ant, and its nests were almost entirely (94.4%) located in P. insigne root clusters. Experimental choice tests conducted on O. hastatus workers confirmed their preference for P. insigne. We propose that the interactions between P. insigne and ants may be intermediate between non-obligatory, reward-based interactions and obligatory, specific ant-myrmecophyte interactions because (1) almost all mature P. insigne individuals are associated with ants; (2) O. hastatus is the most frequent when diverse ants nest in its root clusters; (3) ants colonize mature P. insigne, but rarely young individuals; (4) ants, particularly O. hastatus, protect the foliage of their host; and (5) at least one ant species, O. hastatus, prefers P. insigne over other host plants. The latter relationship is asymmetrical because P. insigne is inhabited by diverse ants whereas O. hastatus nests almost exclusively in P. insigne. (c) 2007 The Linnean Society of London, Biological Journal of the Linnean Society, 2007, 91, 341-346.
Address Univ Toulouse 3, Lab Evolut & Divers Biol, UMR 5174, CNRS,UPS, F-31062 Toulouse 9, France, Email: dejean@cict.fr
Corporate Author Thesis
Publisher Blackwell Publishing Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0024-4066 ISBN Medium
Area Expedition Conference
Notes WOS:000247817100001 Approved no
Call Number EcoFoG @ webmaster @ Serial 356
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Author Latouche-Hallé, C.; Ramboer, A.; Bandou, E.; Caron, H.; Kremer, A.
Title Nuclear and chloroplast genetic structure indicate fine-scale spatial dynamics in a neotropical tree population Type Journal Article
Year 2003 Publication Heredity Abbreviated Journal Heredity
Volume (down) 91 Issue 2 Pages 181-190
Keywords Dicorynia guianensis; Gene flow; Genetic differentiation; Microsatellites; Spatial analysis; Tropical tree; gene flow; genetic structure; population genetics; spatial analysis; tree; tropical forest; Cell Nucleus; Chloroplasts; Cohort Studies; DNA, Plant; French Guiana; Genetic Markers; Pollen; Population Dynamics; Seeds; Trees; Variation (Genetics); French Guiana; Dicorynia guianensis; Embryophyta
Abstract Dicorynia guianensis is a canopy tree, endemic to the tropical rain forest of French Guiana. We compared generational and spatial genetic structure for maternally and biparentally inherited markers in two cohorts (adult and seedling) in order to infer processes shaping the distribution of genetic diversity. The study was conducted on a 40 ha study plot located at Paracou near Kourou, where 172 adults trees and 375 saplings were sampled. Aggregation of trees was therefore suggested at different distances, ranging from 100 to 400 m. There was a strong link between demographic and genetic spatial structures at small distances (less than 100 m) that is likely to be the consequence of restricted seed dispersal. Genetic differentiation was more pronounced between spatial aggregates than between cohorts. Despite the spatial differentiation, the species was able to maintain high levels of diversity for maternal genomes, suggesting rapid turnover of aggregates. Spatial autocorrelation was larger for chloroplast than nuclear markers indicating a strong asymmetry between pollen and seed flow. Fixation indices indicated a lower heterozygote deficiency for the adults, maybe because of gradual elimination of selfed trees. Genetic relatedness at lower distances was higher in adult trees than in saplings, as a result of generation overlapping in the adult cohort. Overall, our results confirm earlier biological knowledge about the dispersion mechanisms of the species, and lead to an enhanced role of spatial processes in the dynamics of genetic diversity of D. guianensis.
Address INRA Lab. Genet. Arbres Forestiers, BP45, 33611 Gazinet Cedex, France
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ISSN 0018067x (Issn) ISBN Medium
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Notes Cited By (since 1996): 34; Export Date: 22 October 2011; Source: Scopus; Coden: Hdtya; doi: 10.1038/sj.hdy.6800296; PubMed ID: 12886285; Language of Original Document: English; Correspondence Address: Caron, H.; INRA Lab. Genet. Arbres Forestiers, BP45, 33611 Gazinet Cedex, France; email: caron@pierroton.inra.fr; Chemicals/CAS: DNA, Plant; Genetic Markers Approved no
Call Number EcoFoG @ webmaster @ Serial 358
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Author Baraloto, Christophier ; Vleminckx, Jason ; Engel, Julien ; Petronelli, Pascal ; Davila, Nallarett ; Rios, Marcos ; Valderrama Sandoval, Elvis Harry ; Mesones, Italo ; Guevara ANdino, Juan Ernesto ; Fortunel, Claire ; Allie, Elodie ; Paine, C.E. Timothy ; Dourdan, Aurélie ; Goret, Jean-Yves ; Valverde-Barrantes, Oscar J. ; Draper, Freddie ; Fine, Paul V. A.
Title Biogeographic history and habitat specialization shape floristic and phylogenetic composition across Amazonian forests Type Journal Article
Year 2021 Publication Ecological Monographs Abbreviated Journal
Volume (down) 91 Issue 4 Pages e01473
Keywords
Abstract A major challenge remains to understand the relative contributions of history, dispersal, and environmental filtering to the assembly of hyperdiverse communities across spatial scales. Here, we examine the extent to which biogeographical history and habitat specialization have generated turnover among and within lineages of Amazonian trees across broad geographic and environmental gradients. We replicated standardized tree inventories in 102 0.1-ha plots located in two distant regions—the western Amazon and the eastern Guiana shield. Within each region, we used a nested design to replicate plots on contrasted habitats: white-sand, terra firme, and seasonally flooded forests. Our plot network encompassed 26,386 trees that together represented 2,745 distinct taxa, which we standardized across all plots and regions. We combined taxonomic and phylogenetic data with detailed soil measurements and climatic data to: (1) test whether patterns of taxonomic and phylogenetic composition are consistent with recent or historical processes, (2) disentangle the relative effects of habitat, environment, and geographic distance on taxonomic and phylogenetic turnover among plots, and (3) contrast the proportion of habitat specialists among species from each region. We found substantial species turnover between Peru and French Guiana, with only 8.8% of species shared across regions; genus composition remained differentiated across habitats and regions, whereas turnover at higher taxonomic levels (family, order) was much lower. Species turnover across plots was explained primarily by regions, but also substantially by habitat differences and to a lesser extent by spatial distance within regions. Conversely, the composition of higher taxonomic levels was better explained by habitats (especially comparing white-sand forests to other habitats) than spatial distance. White-sand forests harbored most of the habitat specialists in both regions, with stronger habitat specialization in Peru than in French Guiana. Our results suggest that recent diversification events have resulted in extremely high turnover in species and genus composition with relatively little change in the composition of higher lineages. Our results also emphasize the contributions of rare habitats, such as white-sand forests, to the extraordinary diversity of the Amazon and underline their importance as conservation priorities.
Address
Corporate Author Thesis
Publisher Ecological Society of America Place of Publication Editor
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Notes Approved no
Call Number EcoFoG @ webmaster @ Serial 1027
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Author Fortunel, C.; Garnier, E.; Joffre, R.; Kazakou, E.; Quested, H.; Grigulis, K.; Lavorel, S.; Ansquer, P.; Castro, H.; Cruz, P.; Dolezal, J.; Eriksson, O.; Freitas, H.; Golodets, C.; Jouany, C.; Kigel, J.; Kleyer, M.; Lehsten, V.; Leps, J.; Meier, T.; Pakeman, R.; Papadimitriou, M.; Papanastasis, V.P.; Quetier, F.; Robson, M.; Sternberg, M.; Theau, J.P.; Thebault, A.; Zarovali, M.
Title Leaf traits capture the effects of land use changes and climate on litter decomposability of grasslands across Europe Type Journal Article
Year 2009 Publication Ecology Abbreviated Journal Ecology
Volume (down) 90 Issue 3 Pages 598-611
Keywords climate; community functional parameters; disturbance; leaf traits; litter decomposability; litter quality
Abstract Land use and climate changes induce shifts in plant functional diversity and community structure, thereby modifying ecosystem processes. This is particularly true for litter decomposition, an essential process in the biogeochemical cycles of carbon and nutrients. In this study, we asked whether changes in functional traits of living leaves in response to changes in land use and climate were related to rates of litter potential decomposition, hereafter denoted litter decomposability, across a range of 10 contrasting sites. To disentangle the different control factors on litter decomposition, we conducted a microcosm experiment to determine the decomposability under standard conditions of litters collected in herbaceous communities from Europe and Israel. We tested how environmental factors ( disturbance and climate) affected functional traits of living leaves and how these traits then modified litter quality and subsequent litter decomposability. Litter decomposability appeared proximately linked to initial litter quality, with particularly clear negative correlations with lignin-dependent indices ( litter lignin concentration, lignin : nitrogen ratio, and fiber component). Litter quality was directly related to community-weighted mean traits. Lignin-dependent indices of litter quality were positively correlated with community-weighted mean leaf dry matter content (LDMC), and negatively correlated with community-weighted mean leaf nitrogen concentration (LNC). Consequently, litter decomposability was correlated negatively with community-weighted mean LDMC, and positively with community-weighted mean LNC. Environmental factors ( disturbance and climate) influenced community-weighted mean traits. Plant communities experiencing less frequent or less intense disturbance exhibited higher community-weighted mean LDMC, and therefore higher litter lignin content and slower litter decomposability. LDMC therefore appears as a powerful marker of both changes in land use and of the pace of nutrient cycling across 10 contrasting sites.
Address [Fortunel, Claire; Garnier, Eric; Joffre, Richard; Kazakou, Elena] CNRS, UMR 5175, Ctr Ecol Fonct & Evolut, F-34293 Montpellier 5, France, Email: claire.fortunel@ecofog.gf
Corporate Author Thesis
Publisher ECOLOGICAL SOC AMER Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0012-9658 ISBN Medium
Area Expedition Conference
Notes ISI:000263776800003 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 121
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Author Clair, B.; Fournier, M.; Prevost, M.F.; Beauchene, J.; Bardet, S.
Title Biomechanics of buttressed trees: Bending strains and stresses Type Journal Article
Year 2003 Publication American Journal of Botany Abbreviated Journal Am. J. Bot.
Volume (down) 90 Issue 9 Pages 1349-1356
Keywords biomechanics; buttress; Eleaocarpaceae; French Guiana; Sloanea spp.; tropical trees; wood
Abstract The different hypotheses about buttress function and formation mainly involve mechanical theory. Forces were applied to two trees of Sloanea spp.. a tropical genus that develops typical thin buttresses. and the three-dimensional strains were measured at different parts of the trunk base. Risks of failure were greater on the buttress sides, where shear and tangential stresses are greater, not on the ridges. in spite of high longitudinal (parallel to the grain) stresses. A simple beam model, computed from the second moment of area of digitized cross sections, is consistent with longitudinal strain variations but cannot predict accurately variations with height. Patterns of longitudinal strain variation along ridges are very different in the two individuals, owing to a pronounced lateral curvature in one specimen. The constant stress hypothesis is discussed based on these results. Without chronological data during the development of the tree. it cannot be proved that buttress formation is activated by stress or strain.
Address CIRAD ENGREF INRA, UMR Ecol Forets Guyane, F-97310 Kourou, Guyane Francais, France
Corporate Author Thesis
Publisher BOTANICAL SOC AMER INC Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0002-9122 ISBN Medium
Area Expedition Conference
Notes ISI:000185459000010 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 244
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Author Lobova, T.A.; Mori, S.A.; Blanchard, F.; Peckham, H.; Charles-Dominique, P.
Title Cecropia as a food resource for bats in French Guiana and the significance of fruit structure in seed dispersal and longevity Type Journal Article
Year 2003 Publication American Journal of Botany Abbreviated Journal Am. J. Bot.
Volume (down) 90 Issue 3 Pages 388-403
Keywords bat dispersal; Cecropia; French Guiana; fruit anatomy; fruit morphology; mucilage; Neotropical bats; soil seed bank
Abstract Cecropia (Cecropiaceae) is a Neotropical genus of pioneer plants. A review of bat/plant dispersal interactions revealed that 15 species of Cecropia are consumed by 32 species of bats. In French Guiana, bats were captured in primary and secondary forests, yielding 936 fecal samples with diaspores, among which 162 contained fruits of C. obtusa, C. palmata, and C. sciadophylla. A comparative morphological and anatomical study of fruits and seeds taken directly from herbarium specimens, bat feces, and an experimental soil seed bank was made. Contrary to previous reports, the dispersal unit of Cecropia is the fruit not the seed. Bats consume the infructescence, digest pulp derived from the enlarged, fleshy perianth, and defecate the fruits. The mucilaginous pericarp of Cecropia is described. The external mucilage production of Cecropia may facilitate endozoochory. The exocarp and part of the mesocarp may be lost after passage through the digestive tract of bats, but fruits buried for a year in the soil seed bank remain structurally unchanged. Fruit characters were found to be useful for identifying species of bat-dispersed Cecropia. Bat dispersal is not necessary for seed germination but it increases seed survival and subsequent germination. Fruit structure plays a significant role in seed longevity.
Address New York Bot Garden, Inst Systemat Bot, Bronx, NY 10458 USA
Corporate Author Thesis
Publisher BOTANICAL SOC AMER INC Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0002-9122 ISBN Medium
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Notes ISI:000183133100008 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 272
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Author Boulogne, I.; Constantino, R.; Amusant, N.; Falkowski, M.; Rodrigues, A.M.S.; Houel, E.
Title Ecology of termites from the genus Nasutitermes (Termitidae: Nasutitermitinae) and potential for science-based development of sustainable pest management programs Type Journal Article
Year 2017 Publication Journal of Pest Science Abbreviated Journal Journal of Pest Science
Volume (down) 90 Issue 1 Pages 19-37
Keywords Antimicrobial and insecticidal botanical extracts; Ipm; Nasutitermes corniger; Sustainable management; Taxonomic history; Termitidae
Abstract The genus Nasutitermes is among the most abundant wood-feeding Termitidae and an extremely diverse and heterogeneous group in terms of its biogeography and morphology. Despite the major role of several Nasutitermes species as structural pests, the phylogenetic status of this genus is still unclear, along with a confused taxonomy and species identification remaining difficult. The first aim of this review was thus to gather and discuss studies concerning the taxonomic status of the genus Nasutitermes in order to clarify this crucial point. Then, our goal was to gain new insights into the management of N. corniger, considered to be the most economically detrimental pest of this genus in South America and a Nasutitermes model species, while filtering available information concerning its biology through the prism of termite control, as well as critically examine the existing methods. We indeed strongly believe that increasing our knowledge of this species’ biological strategies is the key to progress in the challenging question of their sustainable management. © 2016, Springer-Verlag Berlin Heidelberg.
Address Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM), Observatoire Océanologique, Sorbonne Universités, Université Pierre et Marie Curie, CNRS, Banyuls/Mer, France
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Notes Export Date: 17 February 2017 Approved no
Call Number EcoFoG @ webmaster @ Serial 732
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