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Vincent, G.; Caron, F.; Sabatier, D.; Blanc, L. |
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Title |
LiDAR shows that higher forests have more slender trees |
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Journal Article |
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2012 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal |
Bois Forets Tropiques |
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66 |
Issue |
314 |
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51-56 |
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Competition; Fertility; French Guiana; LiDAR; Tree allometry |
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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. |
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CIRAD, UMR Ecofog, 97300 Kourou, France |
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0006579x (Issn) |
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Export Date: 5 June 2013; Source: Scopus; Language of Original Document: English; Correspondence Address: IRD, UMR AMAP, 34000 Montpellier, France |
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EcoFoG @ webmaster @ |
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490 |
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Roux, O.; Rossi, V.; Céréghino, R.; Compin, A.; Martin, J.-M.; Dejean, A. |
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Title |
How to coexist with fire ants: The roles of behaviour and cuticular compounds |
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Journal Article |
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Year |
2013 |
Publication |
Behavioural Processes |
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98 |
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51-57 |
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Aggressiveness; Cuticular hydrocarbons; Dear enemy phenomenon; Nasty neighbour effect; Species coexistence; Supercoloniality |
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Because territoriality is energetically costly, territorial animals frequently respond less aggressively to neighbours than to strangers, a reaction known as the “dear enemy phenomenon” (DEP). The contrary, the “nasty neighbour effect” (NNE), occurs mainly for group-living species defending resource-based territories. We studied the relationships between supercolonies of the pest fire ant Solenopsis saevissima and eight ant species able to live in the vicinity of its nests plus Eciton burchellii, an army ant predator of other ants. The workers from all of the eight ant species behaved submissively when confronted with S. saevissima (dominant) individuals, whereas the contrary was never true. Yet, S. saevissima were submissive towards E. burchellii workers. Both DEP and NNE were observed for the eight ant species, with submissive behaviours less frequent in the case of DEP. To distinguish what is due to chemical cues from what can be attributed to behaviour, we extracted cuticular compounds from all of the nine ant species compared and transferred them onto a number of S. saevissima workers that were then confronted with untreated conspecifics. The cuticular compounds from three species, particularly E. burchellii, triggered greater aggressiveness by S. saevissima workers, while those from the other species did not. © 2013 Elsevier B.V. |
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Université de Toulouse, UPS, Ecolab, 31062 Toulouse, France |
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Export Date: 1 July 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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494 |
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Zaremski, A.; Gastonguay, L.; Zaremski, C.; Chaffanel, F.; Le Floch, G.; Beauchene, J. |
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Title |
Capacity of tropical forest soils of french guiana and réunion for depolluting the woods impregnated with biocides |
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Journal Article |
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Year |
2013 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal |
Bois Forets Tropiques |
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67 |
Issue |
318 |
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51-58 |
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Bioremediation; Copper chromium arsenic(CCA) wood-destroying fungi; Depollution; Loss of mass; Pentachlorophenol(PCP); Treated timber; Tropical soil |
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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. |
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Cirad Umr Ecofog, BP 701, 97387 Kourou cedex, France |
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Lavoisier |
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17775760 (Issn) |
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Export Date: 12 May 2014; Source: Scopus; Language of Original Document: French |
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EcoFoG @ webmaster @ |
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540 |
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Vedel, V.; Arthur, W. |
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Character changes during the early post-embryonic development of the centipede Strigamia maritima (Leach, 1817) (Chilopoda: Geophilomorpha) |
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Journal Article |
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2009 |
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International Journal of Myriapodology |
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2 |
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1 |
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53-61 |
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MOULT DEVELOPMENT ARTHROPOD POST-EMBRYONIC STAGE MORPHOLOGICAL CHANGE MYRIAPOD CENTIPEDE EVO-DEVO |
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For many kinds of ecological, evolutionary and developmental study, it is important to be able to describe the life-history of the individuals of a particular species/population. In the case of myriapods and other arthropods, this involves separating the different life-history stages (or stadia or instars) that are separated by moults. However, it has recently been pointed out that in the earliest post-embryonic stages the cuticle is still quite flexible; this means that visible external developmental changes can occur between moults as well as during them. Here, we provide evidence for such inter-moult changes in the coastal geophilomorph centipede Strigamia maritima. The character states studied enable finer-scale resolution of early post-embryonic forms than was hitherto possible. Specifically, we describe five transitional forms during a period in which just two (Peripatoid and Foetus) have traditionally been recognized |
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Character changes during the early post-embryonic development of the centipede Strigamia maritima (Leach, 1817) (Chilopoda: Geophilomorpha); doi:10.1163/187525409X462412 |
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EcoFoG @ eric.marcon @ 13 |
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187 |
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Malé, P.-J.G.; Leroy, C.; Dejean, A.; Quilichini, A.; Orivel, J. |
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An ant symbiont directly and indirectly limits its host plant's reproductive success |
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Journal Article |
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Year |
2012 |
Publication |
Evolutionary Ecology |
Abbreviated Journal |
Evol. Ecol. |
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26 |
Issue |
1 |
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55-63 |
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Cheater; Evolutionary conflict; Mutualism breakdown; Myrmecophyte; Pollination |
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In theory, mutualisms are intrinsically unstable, and the search for the maximum profit at the minimum cost should lead every mutualist to become a parasite. From an empirical point of view, mutualisms are ubiquitous and of major importance to ecosystems, suggesting the existence of mechanisms that enhance the maintenance of such relationships. We focused on the obligatory myrmecophytic association between the Neotropical plant Hirtella physophora (Chrysobalanaceae) and the ant Allomerus decemarticulatus (Myrmicinae). The plant shelters the ants in leaf pouches in exchange for protection from phytophagous insects. We experimentally demonstrated that the ants partially castrate their host plant by destroying almost two-thirds of its floral buds. The ants also impede pollination through their presence and interactions with pollinators. These results reveal that ant activity negatively affects the plant's reproduction both directly and indirectly. This dual negative effect does not result in the complete castration of the plant. We also highlight major limitations to plant reproduction due to the spontaneous abscission of flowers and to the limited quantity and/or poor quality of the pollen. These limitations must not be overlooked since they can alter the outcome of the association of H. physophora with its ant partner. We therefore conclude that the evolutionary fate of the relationship depends on both ant castration intensity and obstacles to plant fertilization not related to the presence of ants. © 2011 Springer Science+Business Media B.V. |
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Jardin Botanique Henri Gaussen, 39 Allées Jules Guesde, 31062 Toulouse, France |
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02697653 (Issn) |
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Export Date: 2 January 2012; Source: Scopus; Coden: Evece; doi: 10.1007/s10682-011-9485-7; Language of Original Document: English; Correspondence Address: Malé, P.-J. G.; CNRS, EDB (Laboratoire Evolution et Diversité Biologique), UMR 5174, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex 9, France; email: pjmale@cict.fr |
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EcoFoG @ webmaster @ |
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377 |
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Royer, M.; Rodrigues, A.M.S.; Herbette, G.; Beauchene, J.; Chevalier, M.; Herault, B.; Thibaut, B.; Stien, D. |
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Title |
Efficacy of Bagassa guianensis Aubl. extract against wood decay and human pathogenic fungi |
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Journal Article |
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Year |
2012 |
Publication |
International Biodeterioration and Biodegradation |
Abbreviated Journal |
Int. Biodeterior. Biodegrad. |
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70 |
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55-59 |
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Antifungal; Bagassa guianensis; Extractives; Natural durability; Polyphenols; Synergy |
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Extractives that provide natural resistance to Bagassa guianensis Aubl. heartwood were examined. Soil-bed tests showed that the B. guianensis heartwood resistance was significantly reduced after ethyl acetate extraction, whereas methanol and especially water extractions improved the resistance. The ethyl acetate extract was submitted to a bioguided fractionation, and fractions were tested against one wood-destroying fungal strain (Pycnoporus sanguineus) and two human pathogenic fungal strains (Candida glabrata (yeast) and Trichophyton rubrum (filamentous dermatophyte)). Fraction F7, which exhibited the strongest antifungal activity, was subsequently fractionated by high performance liquid chromatography (HPLC). Six previously described compounds were isolated. Although the two moracins, 6-O-methyl-moracin N (3) and moracin N (4) were the most active against fungal strains with MIC values between 4 and 16 μg ml -1, the isolated compounds showed less or equivalent antifungal activity than the initial fraction. Possible synergism between compounds 3 and 4 and other secondary metabolites have been hypothesized. Our study demonstrated that this extract as a whole might be used as a wood preservation or antimycotic product. © 2012 Elsevier Ltd. |
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CNRS, Institut de Chimie des Substances Naturelles, 1 avenue de la Terrasse, 91198 Gif-sur-Yvette, France |
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09648305 (Issn) |
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Export Date: 2 May 2012; Source: Scopus; Coden: Ibbie; doi: 10.1016/j.ibiod.2011.10.016; Language of Original Document: English; Correspondence Address: Royer, M.; Centre de recherche sur le bois, Département des sciences du bois et de la forêt, Faculté de foresterie de géographie et de géomatique, Université Laval, 2425, rue de la Terrasse, Québec, QC, G1V 0A6, Canada; email: mariana.royer.1@ulaval.ca |
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EcoFoG @ webmaster @ |
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398 |
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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. |
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Trade-offs among forest value components in community forests of southwestern Amazonia |
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Journal Article |
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2014 |
Publication |
Ecology and Society |
Abbreviated Journal |
Ecology and Society |
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19 |
Issue |
4 |
Pages |
56 |
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Açai; Biodiversity conservation; Brazil nut; Carbon stocks; Livelihood; Ntfp; Redd; Rubber; Timber; Tropical rainforest |
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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. |
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Department of Sociology and Criminology and Law, University of Florida, United States |
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Export Date: 23 March 2015 |
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EcoFoG @ webmaster @ |
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589 |
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Marcon, E.; Puech, F. |
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A typology of distance-based measures of spatial concentration |
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2017 |
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Regional Science and Urban Economics |
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Regional Science and Urban Economics |
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62 |
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56-67 |
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Agglomeration; Aggregation; Economic geography; Point patterns; Spatial concentration |
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Over the last decade, distance-based methods have been introduced and then improved in the field of spatial economics to gauge the geographic concentration of activities. There is a growing literature on this theme including new tools, discussions on their specific properties and various applications. However, there is currently no typology of distance-based methods. This paper fills that gap. The proposed classification helps understand all the properties of distance-based methods and proves that they are variations on the same framework. © 2016 Elsevier B.V. |
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RITM, Univ. Paris-Sud, CREST, Université Paris-Saclay, Sceaux, France |
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Export Date: 17 January 2017 |
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EcoFoG @ webmaster @ |
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704 |
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Dejean, A.; Grangier, J.; Leroy, C.; Orivel, J. |
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Predation and aggressiveness in host plant protection: a generalization using ants from the genus Azteca |
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Journal Article |
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2009 |
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Naturwissenschaften |
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Naturwissenschaften |
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96 |
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1 |
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57-63 |
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Aggressiveness; Ant-plant relationships; Biotic defence; Predation |
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In studying the ant genus Azteca, a Neotropical group of arboreal species, we aimed to determine the extent to which the ants use predation and/or aggressiveness to protect their host plants from defoliating insects. We compared a territorially dominant, carton-nester, Azteca chartifex, and three plant-ant species. Azteca alfari and Azteca ovaticeps are associated with the myrmecophyte Cecropia (Cecropiaceae) and their colonies shelter in its hollow branches; whereas Azteca bequaerti is associated with Tococa guianensis (Melastomataceae) and its colonies shelter in leaf pouches situated at the base of the laminas. Whereas A. bequaerti workers react to the vibrations transmitted by the lamina when an alien insect lands on a leaf making it unnecessary for them to patrol their plant, the workers of the three other species rather discover prey by contact. The workers of all four species use a predatory behaviour involving spread-eagling alien insects after recruiting nestmates at short range, and, in some cases, at long range. Because A. alfari and A. ovaticeps discard part of the insects they kill, we deduced that the workers' predatory behaviour and territorial aggressiveness combine in the biotic defence of their host tree. |
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[Dejean, Alain; Leroy, Celine] CNRS, UMR Ecol Forets Guyane 8172, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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SPRINGER |
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0028-1042 |
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ISI:000261791000006 |
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EcoFoG @ eric.marcon @ |
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125 |
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Amusant, N.; Digeon, A.; Descroix, L.; Bruneau, O.; Bezard, V.; Beauchene, J. |
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Planting rosewood for sustainable essential oil production: Influence of surrounding forest and seed provenance on tree growth and essential oil yields |
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2015 |
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Bois et Forets des Tropiques |
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Bois et Forets des Tropiques |
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326 |
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4 |
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57-65 |
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Aniba rosaeodora Ducke; Dendrometric traits; Essential oil yield; French Guiana; Light effect; Plantation; Rosewood; Seed provenance |
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Essential oil from the Amazonian rosewood tree (Aniba rosaeodora Ducke) is valued as an important aromatic ingredient in luxury perfumes. Due to over-harvesting in recent decades, rosewood is now listed as an endangered species. Rosewood tree planting is now considered a viable alternative to logging as it can support both reforestation and sustainable agriculture thanks to sales of the essential oil extracted. We planted 605 rosewood trees in French Guiana from two seeds of local provenance, in a 5 445 m2 plot surrounded by primary forest. Nine years after planting, we assessed the effect of the position of the tree relative to the surrounding forest and of the seed provenance on dendrometric traits (height, circumference, above ground woody biomass) and hence on the yield of essential oil. Measurements were made on 99 trees. Average growth rates for the young trees were 0.7 m/year in height, 2.5 cm/year in stem circumference and 990.5 kg dry mass/ha/year in aboveground biomass, while essential oil yields ranged from 0.6% to 3.6% with a mean of 2.1%. The position of the tree relative to the surrounding forest was the main factor affecting tree growth and essential oil production: trees located close to the surrounding forest were significantly smaller and accumulated less essential oil due to the reduced availability of light. Seed provenance had less effect on dendrometric traits and essential oil yields. In conclusion, although planting practices will need to be adapted to avoid the edge effects of proximity to the forest, short-rotation cultivation of rosewood trees could be the optimum and most economically attractive system for the production of essential oil. |
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Office National des Forêts (ONF), Département R and D, Pôle de Cayenne, Réserve de Montabo, BP 87002, Cayenne Cedex, French Guiana |
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Export Date: 7 March 2016 |
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no |
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EcoFoG @ webmaster @ |
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670 |
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