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Dejean, A.; Corbara, B. |
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Title |
Reactions by army ant workers to nestmates having had contact with sympatric ant species |
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Journal Article |
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2014 |
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Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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337 |
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11 |
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642-645 |
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Army ants Antipredation Colony-mate recognition Eciton Transferring cuticular compounds; Eciton; Formicidae |
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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. |
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Clermont Université, Université Blaise-Pascal, LMGE, BP 10448Clermont-Ferrand, France |
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Elsevier Masson SAS |
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16310691 (Issn) |
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Export Date: 12 November 2014; Coden: Crboc; Correspondence Address: Dejean, A.; CNRS, É Cologie des Forêts de Guyane, UMR-CNRS 8172, BP 316, France |
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EcoFoG @ webmaster @ |
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566 |
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Sardans, J.; Urbina, I.; Grau, O.; Asensio, D.; Ogaya, R.; Peñuelas, J. |
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Title |
Long-term drought decreases ecosystem C and nutrient storage in a Mediterranean holm oak forest |
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Journal Article |
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2020 |
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Environmental and Experimental Botany |
Abbreviated Journal |
Environ. Exp. Bot. |
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177 |
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104135 |
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Aridity; Carbon stocks; Climate change; Nitrogen; Phosphorus; Potassium; Stoichiometry; carbon sequestration; deciduous forest; drought; experimental study; forest soil; long-term change; Mediterranean environment; net ecosystem exchange; nutrient cycling; shrub; stoichiometry; Mediterranean Sea; Phillyrea latifolia |
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Aridity has increased in recent decades in the Mediterranean Basin and is projected to continue to increase in the coming decades. We studied the consequences of drought on the concentrations, stoichiometries and stocks of carbon (C), nitrogen (N), phosphorus (P) and potassium (K) in leaves, foliar litter of a three dominant woody species and soil of a Mediterranean montane holm oak forest where soil-water content was experimentally reduced (15 % lower than the control plots) for 15 years. Nitrogen stocks were lower in the drought plots than in the control plots (8.81 ± 1.01 kg ha−1 in the forest canopy and 856 ± 120 kg ha−1 in the 0−15 cm soil layer), thus representing 7 and 18 % lower N stocks in the canopy and soil respectively. δ15N was consistently higher under drought conditions in all samples, indicating a general loss of N. Foliar C and K stocks were also lower but to a lesser extent than N. Decreases in biomass and C and N stocks due to drought were smallest for the most dominant tall shrub, Phillyrea latifolia, so our results suggest a lower capacity of this forest to store C and nutrients but also substantial resulting changes in forest structure with increasing drought. © 2020 Elsevier B.V. |
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Cirad, UMR EcoFoG (AgroParisTech, CNRS, Inra, Univ Antilles, Univ Guyane), Campus Agronomique, Kourou, 97310, French Guiana |
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Elsevier B.V. |
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00988472 (Issn) |
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EcoFoG @ webmaster @ |
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954 |
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Pétillon, J.; Leroy, B.; Djoudi, E.A.; Vedel, V. |
![goto web page (via DOI) doi](img/doi.gif)
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Small and large spatial scale coexistence of ctenid spiders in a neotropical forest (French Guiana) |
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Journal Article |
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2018 |
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Tropical Zoology |
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31 |
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2 |
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85-98 |
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Araneae; flooding; Guianese shield; inselberg; juveniles |
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While spiders constitute the most abundant and diverse arthropods in many habitats, they remained under-studied, especially in tropical rainforests. The goal of this study is to assess the spatial distribution of the spider family Ctenidae by assessing associations of species diversity and population traits among different habitat conditions. Fieldwork was carried out during 2013 in habitats varying in flooding frequency (plateau vs. flooded forest) and elevation (inselberg vs. lowland) in the Nouragues National Natural Reserve, French Guiana. Assemblage composition, population structure, and trait measurements of one dominant species were assessed using hand collection in replicated quadrats. We found strong effects on ctenid assemblages attributable to both elevation and flooding, with changes in relative abundance of species among habitats, but few correlated densities between species. At the population level, main differences in species distribution between and within habitats were detected only when juveniles were taken into account. No effect of elevation was found on the measurements of traits of the dominant species, but legs were proportionally shorter in flooded habitats, suggesting reduced active dispersal in these habitats. Our study highlights the value of complementary of measures of diversity and traits at different biological scales in Ctenidae. |
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UMR CNRS 8175 Ecologie des Forêts de Guyane, Université Antilles-Guyane, Kourou Cedex, Guyane Française, France |
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Export Date: 23 April 2018 |
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EcoFoG @ webmaster @ |
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800 |
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Privet, K.; Vedel, V.; Fortunel, C.; Orivel, J.; Martinez, Q.; Cerdan, A.; Baraloto, C.; Pétillon, J. |
![goto web page url](img/www.gif)
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Title |
Relative effciency of pitfall trapping vs. nocturnal hand collecting in assessing soil-dwelling spider diversity along a structural gradient of neotropical habitats |
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Journal Article |
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2020 |
Publication |
Diversity |
Abbreviated Journal |
Diversity |
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12 |
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2 |
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81 |
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Araneae; Diversity indices; Functional diversity; Guiana shield; Sampling methods; Species richness; Turnover; Araneae |
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Assessing spider diversity remains a great challenge, especially in tropical habitats where dozens of species can locally co-occur. Pitfall trapping is one of the most widely used techniques to collect spiders, but it suffers from several biases, and its accuracy likely varies with habitat complexity. In this study, we compared the efficiency of passive pitfall trapping versus active nocturnal hand collecting (\"HC) to capture low understory-dwelling spider taxonomical (morpho-species) and functional (hunting guilds) diversity along a structural gradient of habitats in French Guiana. We focused on four habitats describing a structural gradient: garden to the orchard to the forest edge to the undisturbed forest. Overall, estimated morpho-species richness and composition did not vary consistently between habitats, but abundances of ground-hunting spiders decreased significantly with increasing habitat complexity. We found habitat-dependence differences in taxonomic diversity between sampling strategies: NHC revealed higher diversity in the orchard, whereas pitfalls resulted in higher diversity in the forest. Species turnover resulted in high dissimilarity in species composition between habitats using either method. This study shows how pitfall trapping is influenced by habitat structure, rendering this sampling method incomplete for complex, tropical environments. However, pitfall traps remain a valuable component of inventories because they sample distinct assemblage of spiders. © 2020 by the authors. |
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International Center for Tropical Botany, Department of Biological Sciences, Florida International University, 11200 S.W. 8th Street, Miami, FL 33199, United States |
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Mdpi Ag |
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14242818 (Issn) |
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Export Date: 16 March 2020; Correspondence Address: Privet, K.; CNRS, Ecobio (Ecosystèmes, biodiversité, évolution), Université de RennesFrance; email: kprivet@hotmail.fr |
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EcoFoG @ webmaster @ |
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923 |
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Vedel, V.; Cerdan, A.; Martinez, Q.; Baraloto, C.; Petitclerc, F.; Orivel, J.; Fortunel, C. |
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Title |
Day-time vs. Night-time sampling does not affect estimates of spider diversity across a land use gradient in the Neotropics |
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Journal Article |
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2015 |
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Journal of Arachnology |
Abbreviated Journal |
Journal of Arachnology |
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43 |
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3 |
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413-416 |
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Araneae; community; day; night; sampling protocol |
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To obtain a reliable description of spider communities, robust sampling protocols are crucial. However, it remains unclear if descriptions of spider communities in tropical habitats require both day and night sampling. Here we tested whether sampling both day and night in high and low vegetation strata would lead to better diversity estimates of spider communities than sampling at only one period of the day. We determined spider taxonomic diversity in a network of 12 plots in French Guiana along a vegetation gradient. We found high alpha diversity of spiders as expected for a tropical area at every site. We showed strong differences in spider alpha and beta diversity between high and low vegetation strata, while they were similar between day and night sampling. Our results suggest that collecting spiders at only one period is sufficient to describe the diversity of spider communities across land use types in the neotropics. © The American Arachnological Society. |
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Department of Biology, University of Maryland, College Park, MD, United States |
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Export Date: 10 December 2015 |
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EcoFoG @ webmaster @ |
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641 |
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Author |
Vedel, V.; Lalague, H. |
![goto web page url](img/www.gif)
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Standardized sampling protocol for spider community assessment in the Neotropical rainforest |
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Journal Article |
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2013 |
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Journal of Entomology and Zoology Studies |
Abbreviated Journal |
J. Entomol. Zool. Stud. |
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2 |
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1 |
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18-34 |
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Araneae; Biodiversity; French Guiana; Guianese Shield; Impact Assessment |
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We described, here, a standardized protocol to collect the maximum number of spiders per unit of effort from the different strata of a tropical forestry habitat. This would allow quantifying the richness of a site and would allow spatial and temporal comparisons between sites. This protocol was tested and applied in a pilot study at four sites representing three different forestry habitats of the natural reserve of La Trinité (French Guiana). Results showed every feeding guild was well represented and most of the 30 families found are represented by several individuals. Indices of species richness, number of singletons, species richness estimators from the accumulation curves and diversity and similarity indices were also calculated and all indicated that La Trinité is a rich and diverse site for spiders. The standardized protocol showed here its efficiency and its wide cover of micro-habitats and is, therefore, recommended for any impact assessment or diversity of spider study in tropical forestry environment. |
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EcoFoG @ webmaster @ |
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487 |
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Vedel, V.; Rheims, C.; Murienne, J.; Brescovit, A.D. |
![goto web page url](img/www.gif)
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Title |
Biodiversity baseline of the French Guiana spider fauna |
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Journal Article |
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2013 |
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SpringerPlus |
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SpringerPlus |
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2 |
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1 |
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1-19 |
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Arachnids; Araneae; Bio monitoring; French Guiana; Neotropics; Species richness |
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The need for an updated list of spiders found in French Guiana rose recently due to many upcoming studies planned. In this paper, we list spiders from French Guiana from existing literature (with corrected nomenclature when necessary) and from 2142 spiders sampled in 12 sites for this baseline study. Three hundred and sixty four validated species names of spider were found in the literature and previous authors' works. Additional sampling, conducted for this study added another 89 identified species and 62 other species with only a genus name for now. The total species of spiders sampled in French Guiana is currently 515. Many other Morphospecies were found but not described as species yet. An accumulation curve was drawn with seven of the sampling sites and shows no plateau yet. Therefore, the number of species inhabiting French Guiana cannot yet be determined. As the very large number of singletons found in the collected materials suggests, the accumulation curve indicates nevertheless that more sampling is necessary to discover the many unknown spider species living in French Guiana, with a focus on specific periods (dry season and wet season) and on specific and poorly studied habitats such as canopy, inselberg and cambrouze (local bamboo monospecific forest). © 2013 Vedel et al. |
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CNRS, EFA, UMR 5174 EDB (Laboratoire Evolution et Diversité Biologique), Université Paul Sabatier, 118 route de Narbonne, F-31062 Toulouse, France |
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21931801 (Issn) |
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Export Date: 25 November 2013; Source: Scopus; doi: 10.1186/2193-1801-2-361; Language of Original Document: English; Correspondence Address: Vedel, V.; Laboratoire d'entomologie Entobios, 5 Bis rue François Thomas, 97310 Kourou, Guyane Française, France; email: vincent.vedel@ecofog.gf |
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EcoFoG @ webmaster @ |
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510 |
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Revel, N.; Alvarez, N.; Gibernau, M.; Espíndola, A. |
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Investigating the relationship between pollination strategies and the size-advantage model in zoophilous plants using the reproductive biology of Arum cylindraceum and other European Arum species as case studies |
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2012 |
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Arthropod-Plant Interactions |
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Arthropod-Plant Interact. |
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6 |
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1 |
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35-44 |
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Araceae; Flower evolution; Plant-insect interactions; Reproductive strategy; Sex allocation |
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The size-advantage model (SAM) explains the temporal variation of energetic investment on reproductive structures (i. e. male and female gametes and reproductive organs) in long-lived hermaphroditic plants and animals. It proposes that an increase in the resources available to an organism induces a higher relative investment on the most energetically costly sexual structures. In plants, pollination interactions are known to play an important role in the evolution of floral features. Because the SAM directly concerns flower characters, pollinators are expected to have a strong influence on the application of the model. This hypothesis, however, has never been tested. Here, we investigate whether the identity and diversity of pollinators can be used as a proxy to predict the application of the SAM in exclusive zoophilous plants. We present a new approach to unravel the dynamics of the model and test it on several widespread Arum (Araceae) species. By identifying the species composition, abundance and spatial variation of arthropods trapped in inflorescences, we show that some species (i. e. A. cylindraceum and A. italicum) display a generalist reproductive strategy, relying on the exploitation of a low number of dipterans, in contrast to the pattern seen in the specialist A. maculatum (pollinated specifically by two fly species only). Based on the model presented here, the application of the SAM is predicted for the first two and not expected in the latter species, those predictions being further confirmed by allometric measures. We here demonstrate that while an increase in the female zone occurs in larger inflorescences of generalist species, this does not happen in species demonstrating specific pollinators. This is the first time that this theory is both proposed and empirically tested in zoophilous plants. Its overall biological importance is discussed through its application in other non-Arum systems. © 2011 Springer Science+Business Media B.V. |
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CNRS-UMR 8172 Ecologie des Forêts de Guyane, BP 709, 97387 Kourou, France |
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18728855 (Issn) |
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Export Date: 21 March 2012; Source: Scopus; doi: 10.1007/s11829-011-9164-1; Language of Original Document: English; Correspondence Address: Espíndola, A.; Department of Ecology and Evolution, University of Lausanne, Biophore Building, 1015 Lausanne, Switzerland; email: MariaAnahi.Espindola@unil.ch |
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EcoFoG @ webmaster @ |
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384 |
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Gibernau, M.; Orivel, J.; Dejean, A.; Delabie, J.; Barabe, D. |
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Flowering as a key factor in ant-Philodendron interactions |
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2008 |
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Journal of Tropical Ecology |
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J. Trop. Ecol. |
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24 |
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689-692 |
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Araceae; domatia; habitat; nest site; non-specific association; Philodendron solimoesense; territoriality |
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[Gibernau, Marc; Orivel, Jerome] Univ Toulouse 3, Lab Evolut & Divers Biol, UMR CNRS 5174, F-31062 Toulouse 9, France, Email: gibernau@cict.fr |
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CAMBRIDGE UNIV PRESS |
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0266-4674 |
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ISI:000261254400012 |
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EcoFoG @ eric.marcon @ |
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128 |
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Leguet, A.; Gibernau, M.; Shintu, L.; Caldarelli, S.; Moja, S.; Baudino, S.; Caissard, J.-C. |
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Evidence for early intracellular accumulation of volatile compounds during spadix development in Arum italicum L. and preliminary data on some tropical Aroids |
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2014 |
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Naturwissenschaften |
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Naturwissenschaften |
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101 |
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8 |
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623-635 |
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Araceae; Cytochemistry; Gas chromatography; Nuclear magnetic resonance; Volatile compounds |
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Staining and histochemistry of volatile organic compounds (VOCs) were performed at different inflorescence developmental stages on nine aroid species; one temperate, Arum italicum and eight tropical from the genera Caladium, Dieffenbachia and Philodendron. Moreover, a qualitative and quantitative analysis of VOCs constituting the scent of A. italicum, depending on the stage of development of inflorescences was also conducted. In all nine species, vesicles were observed in the conical cells of either the appendix or the stamens (thecae) and the staminodes. VOCs were localised in intracellular vesicles from the early stages of inflorescence development until their release during receptivity of gynoecium. This localisation was observed by the increase of both number and diameter of the vesicles during 1 week before receptivity. Afterwards, vesicles were fewer and smaller but rarely absent. In A. italicum, staining and gas chromatography analyses confirmed that the vesicles contained terpenes. The quantitatively most important ones were the sesquiterpenes, but monoterpenes were not negligible. Indeed, the quantities of terpenes matched the vesicles' size evolution during 1 week. Furthermore, VOCs from different biosynthetic pathways (sesquiterpenes and alkanes) were at their maximum quantity 2 days before gynoecium receptivity (sesquiterpenes and alkanes) or during receptivity (isobutylamine, monoterpenes, skatole and p-cresol). VOCs seemed to be emitted during gynoecium receptivity and/or during thermogenesis, and FADs are accumulated after thermogenesis in the spadix. These complex dynamics of the different VOCs could indicate specialisation of some VOCs and cell machinery to attract pollinators on the one hand and to repulse/protect against phytophagous organisms and pathogens after pollination on the other hand. © 2014 Springer-Verlag Berlin Heidelberg. |
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CNRS, UMR-6134 SPE, 20000 Ajaccio, France |
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Springer Verlag |
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ISSN |
00281042 (Issn) |
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Notes |
Export Date: 1 September 2014; Coden: Natwa; Correspondence Address: Gibernau, M.; CNRS, UMR-6134 SPE, 20000 Ajaccio, France; email: gibernau@univ-corse.fr |
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EcoFoG @ webmaster @ |
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558 |
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