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Clair, B.; Ruelle, J.; Thibaut, B. |
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Title |
Relationship between growth stress, mechanical-physical properties and proportion of fibre with gelatinous layer in chestnut (Castanea sativa Mill.) |
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Journal Article |
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Year |
2003 |
Publication |
Holzforschung |
Abbreviated Journal |
Holzforschung |
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57 |
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2 |
Pages |
189-195 |
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Keywords |
growth stress; longitudinal Young's modulus; shrinkage; normal wood; tension wood; gelatinous layer; Castanea Sativa |
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Abstract |
A range of mechanical and physical properties were determined for 96 specimens of chestnut wood and for wood types ranging from compression to tension wood; tests included (1) growth stress, (2) longitudinal Young's modulus in green and air-dried states (3) shrinkage in longitudinal and tangential directions. Anatomical observations permitted determination of the proportion of fibres with a gelatinous layer. The influence of these atypical fibres on macroscopic wood properties is examined and discussed. A basic model is proposed to determine their properties in theoretically isolated conditions. |
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Univ Montpellier 2, Lab Mecan & Genie Civil, F-34095 Montpellier 5, France, Email: clair@lmgc.univ-montp2.fr |
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WALTER DE GRUYTER & CO |
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0018-3830 |
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ISI:000181797800011 |
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EcoFoG @ eric.marcon @ |
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274 |
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Zhang, T.; Bai, S.-L.; Bardet, S.; Almeras, T.; Thibaut, B.; Beauchene, J. |
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Title |
Radial variations of vibrational properties of three tropical woods |
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Journal Article |
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Year |
2011 |
Publication |
Journal of Wood Science |
Abbreviated Journal |
J. Wood Sci. |
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Volume |
57 |
Issue |
5 |
Pages |
377-386 |
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Keywords |
Damping coefficient; Dynamic modulus; Extractives; Microfibril angle; Tropical woods |
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The radial trends of vibrational properties, represented by the specific dynamic modulus (E′/ρ) and damping coefficient (tan δ), were investigated for three tropical rainforest hardwood species (Simarouba amara, Carapa procera, and Symphonia globulifera) using free-free flexural vibration tests. The microfibril angle (MFA) was estimated using X-ray diffraction. Consistent patterns of radial variations were observed for all studied properties. E′/ρ was found to decrease from pith to bark, which was strongly related to the increasing pith-bark trend of MFA. The variation of tan δ along the radius could be partly explained by MFA and partly by the gradient of extractives due to heartwood formation. The coupling effect of MFA and extractives could be separated through analysis of the log(tan δ) versus log(E′/ρ) diagram. For the species studied, the extractive content putatively associated with heartwood formation generally tends to decrease the wood damping coefficient. However, this weakening effect of extractives was not observed for the inner part of the heartwood, suggesting that the mechanical action of extractives was reduced during their chemical ageing. © 2011 The Japan Wood Research Society. |
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CIRAD, UMR Ecofog, BP 701, 97387 Kourou Cedex, Guyane Française, France |
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14350211 (Issn) |
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Export Date: 26 October 2011; Source: Scopus; Coden: Jwscf; doi: 10.1007/s10086-011-1189-7; Language of Original Document: English; Correspondence Address: Bai, S.-L.; Department of Advanced Materials and Nanotechnology, College of Engineering, Peking University, Beijing 100871, China; email: slbai@pku.edu.cn |
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EcoFoG @ webmaster @ |
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363 |
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Brouard, O.; Céréghino, R.; Corbara, B.; Leroy, C.; Pelozuelo, L.; Dejean, A.; Carrias, J.-F. |
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Title |
Understorey environments influence functional diversity in tank-bromeliad ecosystems |
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Journal Article |
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Year |
2012 |
Publication |
Freshwater Biology |
Abbreviated Journal |
Freshw. Biol. |
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Volume |
57 |
Issue |
4 |
Pages |
815-823 |
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Keywords |
Food webs; French Guiana; Invertebrates; Microorganisms; Phytotelmata; Rainforest |
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A substantial fraction of the freshwater available in neotropical forests is impounded within the rosettes of bromeliads that form aquatic islands in a terrestrial matrix. The ecosystem functioning of bromeliads is known to be influenced by the composition of the contained community but it is not clear whether bromeliad food webs remain functionally similar against a background of variation in the understorey environment. We considered a broad range of environmental conditions, including incident light and incoming litter, and quantified the distribution of a very wide range of freshwater organisms (from viruses to macroinvertebrates) to determine the factors that influence the functional structure of bromeliad food webs in samples taken from 171 tank-bromeliads. We observed a gradient of detritus-based to algal-based food webs from the understorey to the overstorey. Algae, rotifers and collector and predatory invertebrates dominated bromeliad food webs in exposed areas, whereas filter-feeding insects had their highest densities in shaded forest areas. Viruses, bacteria and fungi showed no clear density patterns. Detritus decomposition is mainly due to microbial activity in understorey bromeliads where filter feeders are the main consumers of microbial and particulate organic matter (POM). Algal biomass may exceed bacterial biomass in sun-exposed bromeliads where amounts of detritus were lower but functional diversity was highest. Our results provide evidence that tank-bromeliads, which grow in a broad range of ecological conditions, promote aquatic food web diversity in neotropical forests. Moreover, although bromeliad ecosystems have been categorised as detritus-based systems in the literature, we show that algal production can support a non-detrital food web in these systems. © 2012 Blackwell Publishing Ltd. |
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Ecologie des Forêts de Guyane, UMR, CNRS 8172, Campus Agronomique, 97379 Kourou Cedex, France |
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00465070 (Issn) |
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Export Date: 21 March 2012; Source: Scopus; Coden: Fwbla; doi: 10.1111/j.1365-2427.2012.02749.x; Language of Original Document: English; Correspondence Address: Céréghino, R.; INP, UPS EcoLab (Laboratoire Ecologie Fonctionnelle et Environnement), Université de Toulouse, 118 Route de Narbonne, 31062 Toulouse, France; email: regis.cereghino@univ-tlse3.fr |
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EcoFoG @ webmaster @ |
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383 |
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Brosse, Sébastien ; Baglan, Antoine ; Covain, Raphael ; Lalague, Hadrien ; Le Bail, Pierre-Yve ; Vigouroux, Régis ; Quartarollo, Grégory |
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Title |
Aquarium trade and fish farms as a source of non-native freshwater fish introductions in French Guiana |
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Journal Article |
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Year |
2021 |
Publication |
Annales de Limnologie – International Journal of Limnology |
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57 |
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4 |
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Rivers of French Guiana are still little invaded by non-native fish, but several fish introductions were recently recorded through the development of aquarium fish trade and fish farms. Here we report records of 11 non-native fish species. Among them, four (Cichla monoculus, Heros efasciatus, Mesonauta guyanae and Poecilia reticulata) are established and one of them (Heros efasciatus) is rapidly increasing its spatial range. Two species (Hyphessobrycon eques and Pterophyllum scalare) were not retrieved in recent records and are probably extinct from French Guiana. The establishment status of the five other species (Arapaima gigas, Colossoma macropomum, Cyprinus carpio, Oreochromis mossambicus and Osteoglossum bicirrhosum) is uncertain and only a few specimens were observed in the wild. Nevertheless, these species, intensively reared in nearby countries, belong to highly invasive species able to cause detrimental impacts on recipient ecosystems. Those first occurrences of invasive fish species in French Guiana should therefore act as an early warning for both researchers and environmental managers. |
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EDP SCIENCES S A |
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Anglais |
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EcoFoG @ webmaster @ |
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1007 |
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Kiaer, L.P.; Felber, F.; Flavell, A.; Guadagnuolo, R.; Guiatti, D.; Hauser, T.P.; Olivieri, A.M.; Scotti, I.; Syed, N.; Vischi, M.; van de Wiel, C.; Jorgensen, R.B. |
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Title |
Spontaneous gene flow and population structure in wild and cultivated chicory, Cichorium intybus L |
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Journal Article |
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Year |
2009 |
Publication |
Genetic Resources and Crop Evolution |
Abbreviated Journal |
Genet. Resour. Crop Evol. |
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56 |
Issue |
3 |
Pages |
405-419 |
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Keywords |
AFLP; GM co-existence; Gene dispersal; Introgression; Risk assessment; SSAP |
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Spontaneous gene flow between wild and cultivated chicory, Cichorium intybus L., may have implications for the genetic structure and evolution of populations and varieties. One aspect of this crop-wild gene flow is the dispersal of transgenes from genetically modified varieties, e.g. gene flow from GM chicory to natural chicory could have unwanted consequences. With the purpose to identify and quantify crop-wild gene flow in chicory, we analysed introgression in 19 wild chicory populations and 16 accessions of chicory varieties and landraces distributed across Northern, Central and Mediterranean Europe. The analysis used 281 AFLP markers and 75 SSAP markers giving a total of 356 polymorphic markers. Results from model based assignments with the program STRUCTURE indicated many incidents of recent gene flow. Gene flow was observed both between cultivars and wild populations, between landraces and wild populations, between different wild populations as well as between cultivars. Population structure visualized by distance-based clustering showed a North-South geographical structuring of the wild populations, and a general grouping of the cultivars corresponding to known origin. The results indicated, however, that the structuring between the two groups of wild and cultivated types was weak. As crop and wild recipients are genetically close and genes are transferred between the two types rather frequently, focus on mitigating crop-wild gene flow should be increased, before transgenic varieties are cultivated openly. |
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[Kiaer, L. P.; Jorgensen, R. B.] DTU, Riso Natl Lab, Biosyst Dept, DK-4000 Roskilde, Denmark, Email: rikke.bagger.jorgensen@risoe.dk |
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SPRINGER |
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0925-9864 |
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ISI:000264835300011 |
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EcoFoG @ eric.marcon @ |
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204 |
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Lipshutz, B.H.; Taft, B.R.; Abela, A.R.; Ghorai, S.; Krasovskiy, A.; Duplais, C. |
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Title |
Catalysis in the service of green chemistry: Nobel prize-winning palladium-catalysed cross-couplings, run in water at room temperature |
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Journal Article |
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Year |
2012 |
Publication |
Platinum Metals Review |
Abbreviated Journal |
Platinum Met. Rev. |
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Volume |
56 |
Issue |
2 |
Pages |
62-74 |
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Palladium-catalysed cross-couplings, in particular Heck, Suzuki-Miyaura and Negishi reactions developed over three decades ago, are routinely carried out in organic solvents. However, alternative media are currently of considerable interest given an increasing emphasis on making organic processes 'greener'; for example, by minimising organic waste in the form of organic solvents. Water is the obvious leading candidate in this regard. Hence, this review focuses on the application of micellar catalysis, in which a 'designer' surfactant enables these award-winning coupling reactions to be run in water at room temperature. © 2012 Johnson Matthey. |
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UMR-CNRS Ecofog, Institut Pasteur de la Guyane, 23 Avenue Pasteur, 97306 Cayenne, France |
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00321400 (Issn) |
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Cited By (since 1996): 1; Export Date: 15 May 2012; Source: Scopus; Coden: Ptmra; doi: 10.1595/147106712X629761; Language of Original Document: English; Correspondence Address: Lipshutz, B.H.; Department of Chemistry, University of California, Santa Barbara, CA 93106, United States; email: lipshutz@chem.ucsb.edu |
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EcoFoG @ webmaster @ |
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400 |
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Ciminera, M.; Auger-Rozenberg, M.-A.; Caron, H.; Herrera, M.; Scotti-Saintagne, C.; Scotti, I.; Tysklind, N.; Roques, A. |
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Genetic Variation and Differentiation of Hylesia metabus (Lepidoptera: Saturniidae): Moths of Public Health Importance in French Guiana and in Venezuela |
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Journal Article |
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Year |
2019 |
Publication |
Journal of medical entomology |
Abbreviated Journal |
J. Med. Entomol. |
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56 |
Issue |
1 |
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137-148 |
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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. |
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INRA, Unité de Recherche Ecologie des forêts méditerranéennes, Avignon, UR629, France |
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NLM (Medline) |
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19382928 (Issn) |
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Export Date: 1 February 2019 |
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EcoFoG @ webmaster @ |
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857 |
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Leponce, Maurice ; Corbara, Bruno ; Delabie, Jacques H.C. ; Orivel, Jérome ; Aberlenc, Henri-Pierre ; Bail, Johannes ; Barrios, Hector ; Campos, Ricardo I. ; Cardoso do Nascimento, Ivan ; Compin, Arthur ; Didham, Raphaël K. ; Floren, Andreas ; Medianero, Enrique ; Ribeiro, Sérvio P. ; Roisin, Yves ; Schmidl, Juergen ; Tishechkin, Alexey K. ; Winchester, Neville N. ; Basset, Yves ; Dejean, Alain |
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Title |
Spatial and functional structure of an entire ant assemblage in a lowland Panamanian rainforest |
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Journal Article |
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2021 |
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Basic and Applied |
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56 |
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32-44 |
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Ants are a major ecological group in tropical rainforests. Few studies in the Neotropics have documented the distribution of ants from the ground to the canopy, and none have included the understorey. A previous analysis of an intensive arthropod study in Panama, involving 11 sampling methods, showed that the factors influencing ant β diversity (i.e., changes in assemblage composition) were, in decreasing order of importance, the vertical (height), temporal (season), and horizontal (geographic distance) dimensions. In the present study, we went one step further and aimed (1) to identify the best sampling methods to study the entire ant assemblage across the three strata, (2) to test if all strata show a similar horizontal β diversity and (3) to analyze the functional structure of the entire ant assemblage. We identified 405 ant species from 11 subfamilies and 68 genera. Slightly more species were sampled in the canopy than on the ground; they belonged to distinct sub-assemblages. The understorey fauna was mainly a mixture of species found in the other two strata. The horizontal β diversity between sites was similar for the three strata. About half of the ant species foraged in two (29%) or three (25%) strata. A single method, aerial flight interception traps placed alongside tree trunks, acting as arboreal pitfall traps, collected half of the species and reflected the vertical stratification. Using the functional traits approach, we observed that generalist species with mid-sized colonies were by far the most numerous (31%), followed by ground- or litter-dwelling species, either specialists (20%), or generalists (16%), and arboreal species, either generalists (19%) or territorially dominant (8%), and finally army ants (5%). Our results reinforce the idea that a proper understanding of the functioning of ant assemblages requires the inclusion of arboreal ants in survey programs. |
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Elsevier |
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EcoFoG @ webmaster @ |
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1026 |
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Grangier, J.; Orivel, J.; Negrini, M.; Dejean, A. |
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Low intraspecific aggressiveness in two obligate plant-ant species |
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Journal Article |
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2008 |
Publication |
Insectes Sociaux |
Abbreviated Journal |
Insect. Soc. |
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55 |
Issue |
3 |
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238-240 |
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aggressiveness; Allomerus; myrmecophytes; plant-ants; recognition ability |
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Abstract |
Little is known about the aggressiveness of plant-ants typically living in isolated trees nor about how that aggressiveness varies based on this isolation. Here, we examine intra- and interspecific aggressiveness between workers of two Allomerus species associated with two different myrmecophytes. In both cases, the level of intraspecific aggressiveness is very low whatever the distance separating the tested nests, while interspecific conflicts are always violent. Similar patterns of aggressiveness have been reported in various ant species, but the strictly arboreal life of Allomerus ants associated with the isolation of their adult colonies highlight different ecological conditions that might explain the lack of aggressiveness between conspecifics. |
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[Grangier, J.; Orivel, J.; Negrini, M.; Dejean, A.] Univ Toulouse 3, CNRS, UMR 5174, Lab Evolut & Diversite Biol, F-31062 Toulouse 9, France, Email: grangier@cict.fr |
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BIRKHAUSER VERLAG AG |
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0020-1812 |
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ISI:000258959300004 |
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EcoFoG @ eric.marcon @ |
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208 |
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Veron, V.; Caron, H.; Degen, B. |
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Title |
Gene flow and mating system of the tropical tree Sextonia rubra |
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Journal Article |
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Year |
2005 |
Publication |
Silvae Genetica |
Abbreviated Journal |
Silvae Genet. |
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54 |
Issue |
6 |
Pages |
275-280 |
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genetic diversity; gene flow; heterozygosity; microsatellites; mixed mating; tropical tree; twogener |
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Abstract |
In this paper we report a study of the mating system and gene flow of Sextonia rubra, a hermaphroditic, insect pollinated tropical tree species with a geographic distribution in the Guyana Plateau and the Amazon. Using five microsatellites we analysed 428 seeds of 27 open pollinated families at the experimental site “Paracou” in French Guiana. We observed, compared to other tropical tree species, a high level of genetic diversity. We estimated parameters of the mating system and gene flow by using the mixed mating model and the TwoGener approach. The estimated multilocus outcrossing rate, t(m), was 0.992 indicating nearly complete outcrossing. A significant level of biparental inbreeding and a:small proportion. of full-sibs were estimated for the 27 seed arrays. The differentiation of allelic frequencies among the pollen pools was (Phi(FT) = 0.061. We estimated mean pollen dispersal distances between 65 m and 89 m according to the dispersal models used. The joint estimation of pollen dispersal and density of reproductive trees gave an effective density estimate of 2.1-2.2 trees/ha. |
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INRA, UMR, ECOFOG, Kourou 9738, French Guiana, Email: b.degen@holz.uni-hamburg.de |
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J D SAUERLANDERS VERLAG |
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0037-5349 |
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ISI:000235239400005 |
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EcoFoG @ eric.marcon @ |
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182 |
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