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Author Dejean, A.; Corbara, B.
Title Reactions by army ant workers to nestmates having had contact with sympatric ant species Type Journal Article
Year 2014 Publication Comptes Rendus Biologies Abbreviated Journal (down) C. R. Biol.
Volume 337 Issue 11 Pages 642-645
Keywords Army ants Antipredation Colony-mate recognition Eciton Transferring cuticular compounds; Eciton; Formicidae
Abstract It was recently shown that Pheidole megacephala colonies (an invasive species originating from Africa) counterattack when raided by the army ant, Eciton burchellii. The subsequent contact permits Pheidole cuticular compounds (that constitute the “colony odour”) to be transferred onto the raiding Eciton, which are then not recognised by their colony-mates and killed. Using a simple method for transferring cuticular compounds, we tested if this phenomenon occurs for Neotropical ants. Eciton workers rubbed with ants from four sympatric species were released among their colony-mates. Individuals rubbed with Solenopsis saevissima or Camponotus blandus workers were attacked, but not those rubbed with Atta sexdens, Pheidole fallax or with colony-mates (control lot). So, the chemicals of certain sympatric ant species, but not others, trigger intra-colonial aggressiveness in Eciton. We conclude that prey-ant chemicals might have played a role in the evolution of army ant predatory behaviour, likely influencing prey specialization in certain cases.
Address Clermont Université, Université Blaise-Pascal, LMGE, BP 10448Clermont-Ferrand, France
Corporate Author Thesis
Publisher Elsevier Masson SAS Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 16310691 (Issn) ISBN Medium
Area Expedition Conference
Notes Export Date: 12 November 2014; Coden: Crboc; Correspondence Address: Dejean, A.; CNRS, É Cologie des Forêts de Guyane, UMR-CNRS 8172, BP 316, France Approved no
Call Number EcoFoG @ webmaster @ Serial 566
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Author Roux, O.; Le Lann, C.; van Alphen, J.J.M.; van Baaren, J.
Title How does heat shock affect the life history traits of adults and progeny of the aphid parasitoid Aphidius avenae (Hymenoptera: Aphidiidae)? Type Journal Article
Year 2010 Publication Bulletin of Entomological Research Abbreviated Journal (down) Bull. Entomol. Res.
Volume 100 Issue 5 Pages 543-549
Keywords developmental rate; fecundity; heat stress; longevity; sex-specific effect; parasitic wasp
Abstract Because insects are ectotherms, their physiology, behaviour and fitness are influenced by the ambient temperature. Any changes in environmental temperatures may impact the fitness and life history traits of insects and, thus, affect population dynamics. Here, we experimentally tested the impact of heat shock on the fitness and life history traits of adults of the aphid parasitoid Aphidius avenae and on the later repercussions for their progeny. Our results show that short exposure (1h) to an elevated temperature (36 degrees C), which is frequently experienced by parasitoids during the summer, resulted in high mortality rates in a parasitoid population and strongly affected the fitness of survivors by drastically reducing reproductive output and triggering a sex-dependent effect on lifespan. Heat stress resulted in greater longevity in surviving females and in shorter longevity in surviving males in comparison with untreated individuals. Viability and the developmental rates of progeny were also affected in a sex-dependent manner. These results underline the ecological importance of the thermal stress response of parasitoid species, not only for survival, but also for maintaining reproductive activities.
Address [Roux, O.] Univ Toulouse 3, Lab Ecol Fonct, UMR 5245 CNRS UPS INPT, F-31062 Toulouse 04, France, Email: oroux@cict.fr
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 0007-4853 ISBN Medium
Area Expedition Conference
Notes ISI:000282077700005 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 42
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Author Ghislain, B.; Nicolini, E.-A.; Romain, R.; Ruelle, J.; Yoshinaga, A.; Alford, M.H.; Clair, B.
Title Multilayered structure of tension wood cell walls in Salicaceae sensu lato and its taxonomic significance Type Journal Article
Year 2016 Publication Botanical Journal of the Linnean Society Abbreviated Journal (down) Bot. J. Linn. Soc.
Volume 182 Issue 4 Pages 744-756
Keywords Flacourtiaceae; G-layer; multilayered tension wood; reaction wood
Abstract Salicaceae have been enlarged to include a majority of the species formerly placed in the polyphyletic tropical Flacourtiaceae. Several studies have reported a peculiar and infrequently formed multilayered structure of tension wood in four of the tropical genera. Tension wood is a tissue produced by trees to restore their vertical orientation and most studies have focused on trees developing tension wood by means of cellulose-rich, gelatinous fibres, as in Populus and Salix (Salicaceae s.s.). This study aims to determine if the multilayered structure of tension wood is an anatomical characteristic common in other Salicaceae and, if so, how its distribution correlates to phylogenetic relationships. Therefore, we studied the tension wood of 14 genera of Salicaceae and two genera of Achariaceae, one genus of Goupiaceae and one genus of Lacistemataceae, families closely related to Salicaceae or formerly placed in Flacourtiaceae. Opposite wood and tension wood were compared with light microscopy and three-dimensional laser scanning confocal microscopy. The results indicate that a multilayered structure of tension wood is common in the family except in Salix, Populus and one of their closest relatives, Idesia polycarpa. We suggest that tension wood may be a useful anatomical character in understanding phylogenetic relationships in Salicaceae. Further investigation is still needed on the tension wood of several other putatively close relatives of Salix and Populus, in particular Bennettiodendron, Macrohasseltia and Itoa.
Address
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 1095-8339 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number EcoFoG @ webmaster @ Serial 718
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Author Lehnebach, R.; Doumerc, L.; Clair, B.; Alméras, T.
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 (down) 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
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 19162804 (Issn) ISBN Medium
Area Expedition Conference
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 Petit, M.; Céréghino, R.; Carrias, J.-F.; Corbara, B.; Dezerald, O.; Petitclerc, F.; Dejean, A.; Leroy, C.
Title Are ontogenetic shifts in foliar structure and resource acquisition spatially conditioned in tank-bromeliads? Type Journal Article
Year 2014 Publication Botanical Journal of the Linnean Society Abbreviated Journal (down) Bot J Linn Soc
Volume 175 Issue 2 Pages 299-312
Keywords Aechmea mertensii; Camponotus femoratus; French Guiana; leaf traits; mutualistic ants; natural stable isotopes; ontogeny; Pachycondyla goeldii; phenotypic plasticity; plant morphology
Abstract The phenotypic plasticity of plants has been explored as a function of either ontogeny (apparent plasticity) or environment (adaptive plasticity), although few studies have analyzed these factors together. In the present study, we take advantage of the dispersal of Aechmea mertensii bromeliads by Camponotus femoratus or Pachycondyla goeldii ants in shaded and sunny environments, respectively, to quantify ontogenetic changes in morphological, foliar, and functional traits, and to analyze ontogenetic and ant species effects on 14 traits. Most of the morphological (plant height, number of leaves), foliar (leaf thickness, leaf mass area, total water content, trichome density), and functional (leaf δ13C) traits differed as a function of ontogeny. Conversely, only leaf δ15N showed an adaptive phenotypic plasticity. On the other hand, plant width, tank width, longest leaf length, stomatal density, and leaf C concentration showed an adaptation to local environment with ontogeny. The exception was leaf N concentration, which showed no trend at all. Aechmea mertensii did not show an abrupt morphological modification such as in heteroblastic bromeliads, although it was characterized by strong, size-related functional modifications for CO2 acquisition. The adaptive phenotypic variation found between the two ant species indicates the spatially conditioned plasticity of A. mertensii in the context of insect-assisted dispersal. However, ant-mediated effects on phenotypic plasticity in A. mertensii are not obvious because ant species and light environment are confounding variables. © 2014 The Linnean Society of London, Botanical Journal of the Linnean Society, 2014, 175, 299–312.
Address
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 1095-8339 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number EcoFoG @ webmaster @ Serial 564
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Author Tritsch, I.; Gond, V.; Oszwald, J.; Davy, D.; Grenand, P.
Title Territorial dynamics in the wayãpi and teko amerindian communities of the middle oyapock, camopi, French Guiana Type Journal Article
Year 2012 Publication Bois et Forets des Tropiques Abbreviated Journal (down) Bois Forets Tropiques
Volume 66 Issue 311 Pages 49-61
Keywords Amerindian populations; French Guiana; Protected area; Slash-and-burn cultivation; System of natural resource use; Territorial management
Abstract Amerindian populations have been experiencing major socio-economic changes for several decades, in a context of rapid demographic growth. This article addresses the ways in which the Amerindian populations of French Guiana have adapted their land use and natural resource management systems to cope with the pressures exerted on their lands and lifestyles. The aim was to investigate the resilience of their systems for land and natural resource use. The concentration of Amerindian habitats around the town of Camopi, which is linked to the availability of health and school infrastructure and to efforts to promote a sedentary lifestyle, is a factor of increasing natural resource scarcity and social alienation. The system is adapting by fragmenting the Amerindian habitat into peripheral villages and extending farmlands along rivers to access to more space. These villages replicate patterns of spatial organisation that are similar to those found in traditional Wayãpi and Teko villages, except that habitation is sedentary, as families hope to have their villages equipped with at lEast drinking water and electrification. Habitat fragmentation is spatially limited by the time taken for daily journeys to school, and therefore by school bus services (dugout), which means that land use is effectively conditioned by services and infrasrtucture. Other living quarters are maintained at a distance from the village, so that the habitat is bi-local: families have a main home where services and infrastructure are available, and a secondary itinerant home further away, which is chosen according to the quality of farmland, the hunting yield of hunting resources, the history of the location and family networks. These distant homes are kept up by spending income from social assistance on transport. It's thus shown that these Amerindian systems for land and natural resource uses are highly adaptable, in that their sustainability is guaranteed by the reconstruction of a circular pattern of mobility in accordance with the intensity of resource use.
Address Ird Observatoire Hommes-Milieux Oyapock, Cnrs Guyane, 2, avenue Gustave Charlery, 97300 Cayenne, 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 0006579x (Issn) ISBN Medium
Area Expedition Conference
Notes Export Date: 17 April 2013; Source: Scopus; Language of Original Document: French; Correspondence Address: Tritsch, I.; Université des Antilles et de la Guyane/Cirad, Umr Écologie des forêts de Guyane, Campus agronomique de Kourou, 97310 Kourou, France Approved no
Call Number EcoFoG @ webmaster @ Serial 482
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Author Sist, P.; Blanc, L.; Mazzei, L.; Baraloto, C.; Aussenac, R.
Title Current knowledge on overall post-logging biomass dynamics in Northern Amazonian forests Type Journal Article
Year 2012 Publication Bois et Forets des Tropiques Abbreviated Journal (down) Bois Forets Tropiques
Volume 66 Issue 314 Pages 41-49
Keywords Above ground-biomass; Amazonian rainforests; Logging impact; Silviculture
Abstract This article presents the effects of logging on the dynamics of above-ground biomass from the results of the post-logging study within two forests: Cikel in Eastern Pará, Brazil and Paracou in French Guiana. The main objective is to compare the impact of commercial logging on the regeneration of the aboveground biomass in these forests whose characteristics differ in terms of structure and growth. In both sites, the intensity of exploitation is a key factor in determining the loss of biomass and the time required for its regeneration. In Paracou, the regeneration of biomass lost during conventional logging of 10 trees per hectare takes 45 years and more than 100 years when operating with higher intensity (21 trees/ha ). In Cikel the forest biomass regenerates after 49 years harvesting 6 trees/ha and that takes 87 years after removal of 8 trees/ha. This regeneration needs similar time on both sites but with lower logging intensity at Cikel, in which felled trees are larger with a greater biomass than those of Paracou. This post-logging study has established a direct correlation of the dynamics of the biomass with the initial structure of the forest, as well as with the parameters of forest dynamics: mortality, growth and recruitment. The accumulation of biomass by the tree growth of the two remaining stands is a key parameter for the net carbon storage, while the contribution of recruitment in Paracou becomes significant only after 10 years after felling. Therefore in view to improve the growth of residual trees, it is compulsory to apply adequate silvicultural treatments such as selective thinning or removal of vines. While the two forests are geographically close enough, their regenerative abilities differ and because of the significant difference in size of the trees, the forest could tolerate more intensive harvesting in French Guiana.
Address Université Antilles-Guyane Cayenne, Guyane, 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 0006579x (Issn) ISBN Medium
Area Expedition Conference
Notes Export Date: 5 June 2013; Source: Scopus; Language of Original Document: English; Correspondence Address: Cirad UR B and SEF, Campus international de Baillarguet, 34398 Montpellier Cedex 5, France Approved no
Call Number EcoFoG @ webmaster @ Serial 489
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Author Vincent, G.; Caron, F.; Sabatier, D.; Blanc, L.
Title LiDAR shows that higher forests have more slender trees Type Journal Article
Year 2012 Publication Bois et Forets des Tropiques Abbreviated Journal (down) Bois Forets Tropiques
Volume 66 Issue 314 Pages 51-56
Keywords Competition; Fertility; French Guiana; LiDAR; Tree allometry
Abstract High-density Airborne Laser Scanning was used to derive the Canopy Height Model (CHM) of an experimental forest site in the neotropics (Paracou, French Guiana). Individual tree heights were computed by manually segmenting tree crowns on the CHM and then extracting the local maximum canopy height. Three hundred and ninety-six (396) height estimates were matched from dominant or emergent trees with the corresponding ground records of stem diameters sampled in two plots with different mean canopy heights (28.1 m vs. 31.3 m). Tree slenderness was found to be positively and very significantly correlated with mean canopy height at the plot level. The same correlation was observed at the species population level for the three species adequately sampled. It can therefore be concluded that stratification by canopy height is to be recommended when deriving allometric relationships in order to avoid bias in Above Ground Biomass estimations.
Address CIRAD, UMR Ecofog, 97300 Kourou, 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 0006579x (Issn) ISBN Medium
Area Expedition Conference
Notes Export Date: 5 June 2013; Source: Scopus; Language of Original Document: English; Correspondence Address: IRD, UMR AMAP, 34000 Montpellier, France Approved no
Call Number EcoFoG @ webmaster @ Serial 490
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Author Zaremski, A.; Gastonguay, L.; Zaremski, C.; Chaffanel, F.; Le Floch, G.; Beauchene, J.
Title Capacity of tropical forest soils of french guiana and réunion for depolluting the woods impregnated with biocides Type Journal Article
Year 2013 Publication Bois et Forets des Tropiques Abbreviated Journal (down) Bois Forets Tropiques
Volume 67 Issue 318 Pages 51-58
Keywords Bioremediation; Copper chromium arsenic(CCA) wood-destroying fungi; Depollution; Loss of mass; Pentachlorophenol(PCP); Treated timber; Tropical soil
Abstract Wood material for a long time was treated with fungicides or insecticides whose impact on the soil after leaching constitutes a real environmental problem. Nowadays, most of the studies on degradation of these toxic products was carried out with microorganisms which have been isolated in the laboratory. The present study sought to refine the knowledge vis-à-vis these microorganisms, especially wood-destroying fungi degrading pollutants in situ, from which few data are actually available. To decontaminate treated wood, the capacity of wooddestroying microorganisms from tropical forest soils of French Guiana and Reunion was evaluated to degrade toxic biocides. These are pentachlorophenol (PCP) and copper- chromium arsenic based compounds (CCA). Monitoring the degradation of samples of red pine, Pinus resinosa, shows that soils of French Guiana are more efficient than those of Reunion Island in terms of microbial activity vis-àvis these two biocides. A significant difference in loss of mass in specimens of red pine treated with CCA and PCP can range from single to double (respectively 18% and 30%). These findings confirm that CCA is less leacher and less degradable than the PCP by microorganisms in the soil. According to the scale of mass loss in laboratory tests, the wood so treated would be classified very not durable after three years of contact with soil, while the treatment is expected to be very durable.
Address Cirad Umr Ecofog, BP 701, 97387 Kourou cedex, France
Corporate Author Thesis
Publisher Lavoisier Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 17775760 (Issn) ISBN Medium
Area Expedition Conference
Notes Export Date: 12 May 2014; Source: Scopus; Language of Original Document: French Approved no
Call Number EcoFoG @ webmaster @ Serial 540
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Author Guitet, S.; Blanc, L.; Trombe, P.J.; Lehallier, B.
Title Silvicultural Treatments in the Tropical Forests of Guiana: A Review of Ten Years of Trials Type Journal Article
Year 2009 Publication Bois et Forets des Tropiques Abbreviated Journal (down) Bois For. Trop.
Volume 63 Issue 301 Pages 7-19
Keywords cutting cycle; thinning; stand dynamics; logging; French Guiana
Abstract This article reviews an experimental system set up in French Guiana to test different selective thinning methods that started ten to fifteen years after logging in order to reconstitute commercially viable stands within the shortest time. The thinning methods tested involve a combination of selective intervention within a radius of 10 metres around crop trees and systematic intervention applied uniformly to the entire forest parcel. The resulting thinning intensity produces an 8% to 45% reduction in basal area. While the growth of the residual stand is strongly boosted in all species and for all diameters, there is little change in basal area because of high mortality and lower recruitment of commercial species. Standing commercial capital, however, is strongly affected by the thinning operations as defined. In effect, these thinning methods that benefit crop stems do not meet the objective of shorter rotations in Guiana's tropical logging forests. On the other hand, the measurements made in under-treatment stands agree with those obtained at the Paracou experimental station and confirm the need to adopt long cutting cycles of more than fifty years to ensure that the extraction of valuable species is sustainable in the current logging context in French Guiana.
Address [Guitet, Stephane; Trombe, Pierre-Julien; Lehallier, Benoit] Direct Reg Guyane, Off Natl Forets, F-97307 Cayenne, France
Corporate Author Thesis
Publisher CIRAD-CENTRE COOPERATION INT RECHERCHE AGRONOMIQUE POUR Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0006-579X ISBN Medium
Area Expedition Conference
Notes ISI:000272488700002 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 91
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