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Hibert, F.; Sabatier, D.; Andrivot, J.; Scotti-Saintagne, C.; Gonzalez, S.; Prévost, M.-F.; Grenand, P.; Chave, J.; Caron, H.; Richard-Hansen, C. |
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Title |
Botany, genetics and ethnobotany: A crossed investigation on the elusive tapir's diet in French guiana |
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Journal Article |
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Year |
2011 |
Publication |
PLoS One |
Abbreviated Journal |
PLoS ONE |
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6 |
Issue |
10 |
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e25850 |
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While the populations of large herbivores are being depleted in many tropical rainforests, the importance of their trophic role in the ecological functioning and biodiversity of these ecosystems is still not well evaluated. This is due to the outstanding plant diversity that they feed upon and the inherent difficulties involved in observing their elusive behaviour. Classically, the diet of elusive tropical herbivores is studied through the observation of browsing signs and macroscopic analysis of faeces or stomach contents. In this study, we illustrate that the original coupling of classic methods with genetic and ethnobotanical approaches yields information both about the diet diversity, the foraging modalities and the potential impact on vegetation of the largest terrestrial mammal of Amazonia, the lowland tapir. The study was conducted in the Guianan shield, where the ecology of tapirs has been less investigated. We identified 92 new species, 51 new genera and 13 new families of plants eaten by tapirs. We discuss the relative contribution of our different approaches, notably the contribution of genetic barcoding, used for the first time to investigate the diet of a large tropical mammal, and how local traditional ecological knowledge is accredited and valuable for research on the ecology of elusive animals. © 2011 Hibert et al. |
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INRA, Université de Bordeaux, UMR1202 BIOGECO, Cestas, France |
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19326203 (Issn) |
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Export Date: 21 October 2011; Source: Scopus; Art. No.: e25850; doi: 10.1371/journal.pone.0025850; Language of Original Document: English; Correspondence Address: Hibert, F.; Direction Etudes et Recherches Guyane, Office National de la Chasse et de la Faune Sauvage, Kourou, French Guiana, France; email: fabricenz@gmail.com |
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EcoFoG @ webmaster @ |
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343 |
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Lebrini, M.; Mbomekallé, I.M.; Dolbecq, A.; Marrot, J.; Berthet, P.; Ntienoue, J.; Sécheresse, F.; Vigneron, J.; Etcheberry, A. |
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Title |
Manganese(III)-containing wells-dawson sandwich-type polyoxometalates: Comparison with their manganese(II) counterparts |
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Journal Article |
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Year |
2011 |
Publication |
Inorganic Chemistry |
Abbreviated Journal |
Inorg. Chem. |
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50 |
Issue |
14 |
Pages |
6437-6448 |
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We present the synthesis and structural characterization, assessed by various techniques (FTIR, TGA, UV-vis, elemental analysis, single-crystal X-ray diffraction for three compounds, magnetic susceptibility, and electrochemistry) of five manganese-containing Wells-Dawson sandwich-type (WDST) complexes. The dimanganese(II)-containing complex, [Na2(H2O) 2MnII2(As2W15O 56)2]18- (1), was obtained by reaction of MnCl2 with 1 equiv of [As2W15O 56]12- in acetate medium (pH 4.7). Oxidation of 1 by Na2S2O8 in aqueous solution led to the dimanganese(III) complex [Na2(H2O)2Mn III2(As2W15O56) 2]16- (2), while its trimanganese(II) homologue, [Na(H2O)2MnII(H2O)Mn II2(As2W15O56) 2]17- (3), was obtained by addition of ca. 1 equiv of MnCl2 to a solution of 1 in 1 M NaCl. The trimanganese(III) and tetramanganese(III) counterparts, [MnIII(H2O)Mn III2(As2W15O56) 2]15- (4) and [MnIII2(H 2O)2MnIII2(As2W 15O56)2]12- (6), are, respectively, obtained by oxidation of aqueous solutions of 3 and [MnII2(H2O)2MnII2(As 2W15O56)2]16- (5) by Na2S2O8. Single-crystal X-ray analyses were carried out on 2, 3, and 4. BVS calculations and XPS confirmed that the oxidation state of Mn centers is +II for complexes 1, 3, and 5 and +III for 2, 4, and 6. A complete comparative electrochemical study was carried out on the six compounds cited above, and it was possible to observe the distinct redox steps MnIV/III and MnIII/II. Magnetization measurements, as a function of temperature, confirm the presence of antiferromagnetic interactions between the Mn ions in these compounds in all cases with the exception of compound 2. © 2011 American Chemical Society. |
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Laboratoire de Physico-Chimie de L'Etat Solide, ICMMO, Université Paris-Sud, Bâtiment 410, 91405 Orsay Cedex, France |
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00201669 (Issn) |
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Export Date: 21 October 2011; Source: Scopus; Coden: Inoca; doi: 10.1021/ic102237x; Language of Original Document: English; Correspondence Address: Mbomekallé, I.M.; Institut Lavoisier de Versailles, UMR 8180, CNRS Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France; email: israel.mbomekalle@chimie.uvsq.fr |
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EcoFoG @ webmaster @ |
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346 |
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Delabie, J.H.C.; Groc, S.; Dejean, A. |
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The tramp ant technomyrmex vitiensis (Hymenoptera: Formicidae: Dolichoderinae) on South America |
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Journal Article |
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Year |
2011 |
Publication |
Florida Entomologist |
Abbreviated Journal |
Fla. Entomol. |
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Volume |
94 |
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3 |
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688-689 |
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Technomyrmex vitiensis is a tramp ant that has spread through many parts of the Old World tropics via human commerce. This species has been previously reported only once in the New World, from San Francisco, California. Here, we report the first records of T. vitiensis in South America, from two sites deep in the forest of French Guiana. It is not clear how these ants were transported to such remote sites, 100 km inland. Copyright © 2011 BioOne All rights reserved. |
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Université de Toulouse, UPS, 118 route de Narbonne, F-31062 Toulouse, France |
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00154040 (Issn) |
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Export Date: 26 October 2011; Source: Scopus; Coden: Fetma; doi: 10.1653/024.094.0335; Language of Original Document: English; Correspondence Address: Delabie, J.H.C.; Universidade Estadual de Santa Cruz, Rodovia Ilhéus-Itabuna, Km 16, 45650-000 Ilhéus, Bahia, Brazil |
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EcoFoG @ webmaster @ |
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364 |
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Bremaud, I.; Gril, J.; Thibaut, B. |
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Title |
Anisotropy of wood vibrational properties: dependence on grain angle and review of literature data |
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Journal Article |
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Year |
2011 |
Publication |
Wood Science and Technology |
Abbreviated Journal |
Wood Sci. Technol. |
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45 |
Issue |
4 |
Pages |
735-754 |
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The anisotropy of vibrational properties influences the acoustic behaviour of wooden pieces and their dependence on grain angle (GA). As most pieces of wood include some GA, either for technological reasons or due to grain deviations inside trunks, predicting its repercussions would be useful. This paper aims at evaluating the variability in the anisotropy of wood vibrational properties and analysing resulting trends as a function of orientation. GA dependence is described by a model based on transformation formulas applied to complex compliances, and literature data on anisotropic vibrational properties are reviewed. Ranges of variability, as well as representative sets of viscoelastic anisotropic parameters, are defined for mean hardwoods and softwoods and for contrasted wood types. GA-dependence calculations are in close agreement with published experimental results and allow comparing the sensitivity of different woods to GA. Calculated trends in damping coefficient (tan delta) and in specific modulus of elasticity (E'/rho) allow reconstructing the general tan delta-E'/rho statistical relationships previously reported. Trends for woods with different mechanical parameters merge into a single curve if anisotropic ratios (both elastic and of damping) are correlated between them, and with axial properties, as is indicated by the collected data. On the other hand, varying damping coefficient independently results in parallel curves, which coincide with observations on chemically modified woods, either “artificially”, or by natural extractives. |
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[Bremaud, I; Gril, J] Univ Montpellier 2, Lab Mecan & Genie Civil, CNRS, CC048, F-34095 Montpellier 5, France, Email: iris_bremaud@hotmail.com |
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Springer |
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English |
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0043-7719 |
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WOS:000296006000009 |
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EcoFoG @ webmaster @ |
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369 |
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Dejean, A.; Cereghino, R.; Carpenter, J.M.; Corbara, B.; Herault, B.; Rossi, V.; Leponce, M.; Orivel, J.; Bonal, D. |
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Climate change impact on neotropical social wasps |
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Journal Article |
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Year |
2011 |
Publication |
PLoS One |
Abbreviated Journal |
PLoS ONE |
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Volume |
6 |
Issue |
11 |
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e27004 |
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Establishing a direct link between climate change and fluctuations in animal populations through long-term monitoring is difficult given the paucity of baseline data. We hypothesized that social wasps are sensitive to climatic variations, and thus studied the impact of ENSO events on social wasp populations in French Guiana. We noted that during the 2000 La Niña year there was a 77.1% decrease in their nest abundance along ca. 5 km of forest edges, and that 70.5% of the species were no longer present. Two simultaneous 13-year surveys (1997-2009) confirmed the decrease in social wasps during La Niña years (2000 and 2006), while an increase occurred during the 2009 El Niño year. A 30-year weather survey showed that these phenomena corresponded to particularly high levels of rainfall, and that temperature, humidity and global solar radiation were correlated with rainfall. Using the Self-Organizing Map algorithm, we show that heavy rainfall during an entire rainy season has a negative impact on social wasps. Strong contrasts in rainfall between the dry season and the short rainy season exacerbate this effect. Social wasp populations never recovered to their pre-2000 levels. This is probably because these conditions occurred over four years; heavy rainfall during the major rainy seasons during four other years also had a detrimental effect. On the contrary, low levels of rainfall during the major rainy season in 2009 spurred an increase in social wasp populations. We conclude that recent climatic changes have likely resulted in fewer social wasp colonies because they have lowered the wasps' resistance to parasitoids and pathogens. These results imply that Neotropical social wasps can be regarded as bio-indicators because they highlight the impact of climatic changes not yet perceptible in plants and other animals. © 2011 Dejean et al. |
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INRA – Nancy, UMR EEF, Champenou, Nancy, France |
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19326203 (Issn) |
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Export Date: 29 November 2011; Source: Scopus; Art. No.: e27004; doi: 10.1371/journal.pone.0027004; Language of Original Document: English; Correspondence Address: Dejean, A.; CNRS – UMR 8172, Écologie des Forêts de Guyane (Ecofog), Campus Agronomique, BP 709, Kourou, France; email: alain.dejean@wanadoo.fr |
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EcoFoG @ webmaster @ |
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372 |
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Rifflet, A.; Tene, N.; Orivel, J.; Treilhou, M.; Dejean, A.; Vetillard, A. |
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Paralyzing Action from a Distance in an Arboreal African Ant Species |
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Journal Article |
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2011 |
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PLoS One |
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PLoS ONE |
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6 |
Issue |
12 |
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e28571 |
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Due to their prowess in interspecific competition and ability to catch a wide range of arthropod prey (mostly termites with which they are engaged in an evolutionary arms race), ants are recognized as a good model for studying the chemicals involved in defensive and predatory behaviors. Ants' wide diversity of nesting habits and relationships with plants and prey types implies that these chemicals are also very diverse. Using the African myrmicine ant Crematogaster striatula as our focal species, we adopted a three-pronged research approach. We studied the aggressive and predatory behaviors of the ant workers, conducted bioassays on the effect of their Dufour gland contents on termites, and analyzed these contents. (1) The workers defend themselves or eliminate termites by orienting their abdominal tip toward the opponent, stinger protruded. The chemicals emitted, apparently volatile, trigger the recruitment of nestmates situated in the vicinity and act without the stinger having to come into direct contact with the opponent. Whereas alien ants competing with C. striatula for sugary food sources are repelled by this behavior and retreat further and further away, termites defend their nest whatever the danger. They face down C. striatula workers and end up by rolling onto their backs, their legs batting the air. (2) The bioassays showed that the toxicity of the Dufour gland contents acts in a time-dependent manner, leading to the irreversible paralysis, and, ultimately, death of the termites. (3) Gas chromatography-mass spectrometry analyses showed that the Dufour gland contains a mixture of mono- or polyunsaturated long-chain derivatives, bearing functional groups like oxo-alcohols or oxo-acetates. Electrospray ionization-mass spectrometry showed the presence of a molecule of 1584 Da that might be a large, acetylated alkaloid capable of splitting into smaller molecules that could be responsible for the final degree of venom toxicity. |
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Public Library of Science |
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EcoFoG @ webmaster @ |
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376 |
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Bordenave, B.; Lehir, F.; Lorans, M. |
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Current knowledge on threatened plant species of French Guiana |
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Journal Article |
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Year |
2012 |
Publication |
Revue d'Ecologie (La Terre et la Vie) |
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Rev. Ecol. Terre Vie |
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67 |
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Suppl.2 |
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29-45 |
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The elaboration of a first list of the most threatened species of the overseas territory of French Guyana was undertaken in 2009 by the Association for Botanical Conservation in French Guiana in collaboration with the National Botanical Conservatory of Brest. Carried out in synergy with the updating of the species list for Natural Areas of Ecological, Faunistic and Floritic Interests supervised by the Region Science Council for Natural Heritage, this work includes 97 vascular plants, 18 of which can be considered as threatened in the state of current knowledge, according to the IUCN criteria which are recommended by the Federation of National Botanical Conservatories. Among these 18 taxa, threatened because of their rarity and the fragility of their natural habitats, 17 are already protected by a 2001 ministry decree and one is from a new genus, Hekkingia bordenavei; nine of these appear to be of high concern for conservation: Cleistes grandifiora (Orchidaceae), Cornutia pubescens (Verbenaceae), Antirhea triflora (Rubiaceae), Himathantus drasticus (Apocynaceae), Axonopus oiapocensis (Poaceae), Psychotria granvillei (Rubiaceae), Eriocaulon guyanense (Eriocaulaceae) along with two palm species subject to National Action Plans for their conservation since 2009, Astrocaryum minus and Bactris nancibaensis. This study also contributes to the on-going “regional Red List” of the French Guiana flora. |
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Étudiant en Master 2, Écologie des Forêts Tropicales, Université de Kourou, 1 rue de l'Université, 97310 Kourou, Guyane Française, France |
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02497395 (Issn) |
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Export Date: 13 April 2012; Source: Scopus; Coden: Retve; Language of Original Document: French; Correspondence Address: Bordenave, B.; BGB Consultance, Botanique Tropicale, 9 route des grandes roches, 29910 Trégunc, France; email: bruno.bordenave@wanadoo.fr |
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390 |
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Lauth, J.; Ruiz-González, M.X.; Orivel, J. |
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New findings in insect fungiculture: Have ants developed non-food, agricultural products? |
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Journal Article |
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2011 |
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Communicative & Integrative Biology |
Abbreviated Journal |
Comm & Integr Biol |
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4 |
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1942-0889 |
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728-730 |
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The interaction between Allomerus plant-ants and an ascomycete fungus growing on and strengthening their galleries is not opportunistic. We previously demonstrated that this association is highly specific as only one fungal species represented by a few haplotypes was found associated with the ants. We also discovered that the ants' behavior revealed a major investment in manipulating and enhancing the growth of their associated fungus. We have growing evidence that this specificity is consistent with selection by the ants. Here, we discuss this selection within the framework of insect agriculture, as we believe these ants fulfill all of the prerequisites to be considered as farmers. Allomerus ants promote their symbiont's growth, protect it from potential pathogens and select specific cultivars. Taken together, we think that the interaction between Allomerus ants and their cultivar might represent the first case of insect fungiculture used as a means of obtaining building material. |
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Landes Bioscience Inc. |
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379 |
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Marcon, E.; Herault, B.; Baraloto, C.; Lang, G. |
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The decomposition of Shannon's entropy and a confidence interval for beta diversity |
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Journal Article |
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2012 |
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Oikos |
Abbreviated Journal |
Oikos |
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121 |
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4 |
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516-522 |
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Beta diversity is among the most employed theoretical concepts in ecology and biodiversity conservation. Up to date, a self-contained definition of it, with no reference to alpha and gamma diversity, has never been proposed. Using Kullback-Leibler divergence, we present the explicit formula of Shannon's β entropy, a bias correction for its estimator and a confidence interval. We also provide the mathematical framework to decompose Shannon diversity into several hierarchical nested levels. From botanical inventories of tropical forest plots in French Guiana, we estimate Shannon diversity at the plot, forest and regional level. We believe this is a complete and usefulness toolbox for ecologists interested in partitioning biodiversity. © 2011 The Authors. Oikos © 2012 Nordic Society Oikos. |
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AgroParisTech, UMR 518 Math. Info. Appli., 16 rue Claude Bernard, FR-75005 Paris, France |
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00301299 (Issn) |
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Export Date: 28 March 2012; Source: Scopus; Coden: Oiksa; doi: 10.1111/j.1600-0706.2011.19267.x; Language of Original Document: English; Correspondence Address: Marcon, E.; AgroParisTech, UMR EcoFoG, BP 709, FR-97310 Kourou, France; email: eric.marcon@ecofog.gf |
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EcoFoG @ webmaster @ |
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386 |
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Vantaux, A.; Roux, O.; Magro, A.; Orivel, J. |
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Evolutionary perspectives on myrmecophily in ladybirds |
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Journal Article |
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Year |
2012 |
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Psyche |
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Psyche |
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591570 |
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1-7 |
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Myrmecophiles are species that usually have developed specialized traits to cope with the aggressiveness of ants enabling them to live in their vicinity. Many coccinellid species are predators of Hemiptera; the latter is also often protected by ants. Therefore these ladybirds frequently interact with ants, and some species have become myrmecophilous. In this paper, we aim to provide an overview of the evolution of myrmecophilous traits in ladybirds. We then discuss the costs and benefits of myrmecophily and the dietary shift to myrmecophagy observed in a few species. Copyright © 2012 Amélie Vantaux et al. |
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CNRS, UMR EcoFoG-Ecologie des Forêts de Guyane, Campus Agronomique, BP 316, 97379 Kourou Cedex, France |
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Export Date: 28 March 2012; Source: Scopus; Art. No.: 591570; doi: 10.1155/2012/591570; Language of Original Document: English; Correspondence Address: Vantaux, A.; Entomology Laboratory, Zoological Institute, Catholic University of Leuven, Naamsestraat 59, 3000 Leuven, Belgium; email: amelie.vantaux@gmail.com |
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