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Ménard, L.; McKey, D.; Mühlen, G.S.; Clair, B.; Rowe, N.P. |
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The Evolutionary Fate of Phenotypic Plasticity and Functional Traits under Domestication in Manioc: Changes in Stem Biomechanics and the Appearance of Stem Brittleness |
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2013 |
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PLoS ONE |
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PLoS ONE |
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8 |
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9 |
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e74727 |
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Domestication can influence many functional traits in plants, from overall life-history and growth form to wood density and cell wall ultrastructure. Such changes can increase fitness of the domesticate in agricultural environments but may negatively affect survival in the wild. We studied effects of domestication on stem biomechanics in manioc by comparing domesticated and ancestral wild taxa from two different regions of greater Amazonia. We compared mechanical properties, tissue organisation and wood characteristics including microfibril angles in both wild and domesticated plants, each growing in two different habitats (forest or savannah) and varying in growth form (shrub or liana). Wild taxa grew as shrubs in open savannah but as lianas in overgrown and forested habitats. Growth form plasticity was retained in domesticated manioc. However, stems of the domesticate showed brittle failure. Wild plants differed in mechanical architecture between shrub and liana phenotypes, a difference that diminished between shrubs and lianas of the domesticate. Stems of wild plants were generally stiffer, failed at higher bending stresses and were less prone to brittle fracture compared with shrub and liana phenotypes of the domesticate. Biomechanical differences between stems of wild and domesticated plants were mainly due to changes in wood density and cellulose microfibril angle rather than changes in secondary growth or tissue geometry. Domestication did not significantly modify “large-scale” trait development or growth form plasticity, since both wild and domesticated manioc can develop as shrubs or lianas. However, “finer-scale” developmental traits crucial to mechanical stability and thus ecological success of the plant were significantly modified. This profoundly influenced the likelihood of brittle failure, particularly in long climbing stems, thereby also influencing the survival of the domesticate in natural situations vulnerable to mechanical perturbation. We discuss the different selective pressures that could explain evolutionary modifications of stem biomechanical properties under domestication in manioc. © 2013 Ménard et al. |
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CNRS, UMR Ecologie des Forêts de Guyane (EcoFoG), Campus Agronomique, Kourou, French Guiana |
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Export Date: 13 September 2013; Source: Scopus; Art. No.: e74727; Coden: Polnc; doi: 10.1371/journal.pone.0074727; Language of Original Document: English; Correspondence Address: Rowe, N. P.; Université Montpellier 2, UMR AMAP, Montpellier, France; email: nrowe@cirad.fr |
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Maia, A.C.D.; Gibernau, M.; Dötterl, S.; Do Amaral Ferraz Navarro, D.M.; Seifert, K.; Müller, T.; Schlindwein, C. |
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The floral scent of Taccarum ulei (Araceae): Attraction of scarab beetle pollinators to an unusual aliphatic acyloin |
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2013 |
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Phytochemistry |
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Phytochemistry |
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93 |
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71-78 |
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(S)-2-Hydroxy-5-methyl-3-hexanone; Araceae; Behavioral tests; Cyclocephala celata and C. cearae; Dihydro-β-ionone; Floral volatiles; Taccarum ulei |
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The strongly fragrant thermogenic inflorescences of Taccarum ulei (Araceae) are highly attractive to nightactive scarab beetles of Cyclocephala celata and C. cearae (Scarabaeidae, Cyclocephalini), which are effective pollinators of plants in the wild in northeastern Brazil. GC-MS analysis of headspace floral scent samples of T. ulei established that two constituents, (S)-2-hydroxy-5- methyl-3-hexanone (an aliphatic acyloin rarely detected in flowers) and dihydro-b-ionone (an irregular terpene) accounted for over 96% of the total scent discharge. Behavioral tests (in both field and cages) showed that male and female C. celata and C. cearae were attracted to traps baited with a synthetic mixture of both compounds; however, they were also responsive to (S)-2-hydroxy-5-methyl-3-hexanone alone, which thus functions as a specific attractive cue. These findings support other recent research in suggesting that angiosperms pollinated by cyclocephaline scarab beetles release floral odors of limited complexity in terms of numbers of compounds, but often dominated by unusual compounds that may ensure attraction of specific pollinator species. © 2013 Elsevier B.V. |
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Organismic Biology, Plant Ecology, Salzburg University, 5020 Salzburg, Austria |
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Export Date: 10 October 2013; Source: Scopus; Coden: Pytca; doi: 10.1016/j.phytochem.2013.03.005; Language of Original Document: English; Correspondence Address: Maia, A.C.D.; Universidade Federal de Pernambuco, Centro de Ciências Exatas e da Natureza, Departamento de Química Fundamental, Av. Jornalista Anibal Fernandes, s/n, Cidade Universita, Recife, PE 50740-560, Brazil; email: arturcamposmaia@yahoo.com.br |
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EcoFoG @ webmaster @ |
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Brousseau, L.; Bonal, D.; Cigna, J.; Scotti, I. |
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Highly local environmental variability promotes intrapopulation divergence of quantitative traits: An example from tropical rain forest trees |
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Journal Article |
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2013 |
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Annals of Botany |
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Ann. Bot. |
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112 |
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6 |
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1169-1179 |
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common garden experiment; E. grandiflora; ecological traits; Eperua falcata; habitat mosaics; intrapopulation divergence; maternal family inheritance |
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Background and AimsIn habitat mosaics, plant populations face environmental heterogeneity over short geographical distances. Such steep environmental gradients can induce ecological divergence. Lowland rainforests of the Guiana Shield are characterized by sharp, short-distance environmental variations related to topography and soil characteristics (from waterlogged bottomlands on hydromorphic soils to well-drained terra firme on ferralitic soils). Continuous plant populations distributed along such gradients are an interesting system to study intrapopulation divergence at highly local scales. This study tested (1) whether conspecific populations growing in different habitats diverge at functional traits, and (2) whether they diverge in the same way as congeneric species having different habitat preferences.MethodsPhenotypic differentiation was studied within continuous populations occupying different habitats for two congeneric, sympatric, and ecologically divergent tree species (Eperua falcata and E. grandiflora, Fabaceae). Over 3000 seeds collected from three habitats were germinated and grown in a common garden experiment, and 23 morphological, biomass, resource allocation and physiological traits were measured.Key ResultsIn both species, seedling populations native of different habitats displayed phenotypic divergence for several traits (including seedling growth, biomass allocation, leaf chemistry, photosynthesis and carbon isotope composition). This may occur through heritable genetic variation or other maternally inherited effects. For a sub-set of traits, the intraspecific divergence associated with environmental variation coincided with interspecific divergence. Conclusions The results indicate that mother trees from different habitats transmit divergent trait values to their progeny, and suggest that local environmental variation selects for different trait optima even at a very local spatial scale. Traits for which differentiation within species follows the same pattern as differentiation between species indicate that the same ecological processes underlie intra- and interspecific variation. © 2013 The Author. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. |
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Université de Lorraine, UMR 1137 Ecologie et Ecophysiologie Forestières, Vandœuvre-lès-Nancy, France |
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Export Date: 17 October 2013; Source: Scopus; Coden: Anboa; doi: 10.1093/aob/mct176; Language of Original Document: English; Correspondence Address: Scotti, I.; INRA, UMR Ecologie des Forêts de Guyane, Campus Agronomique, BP 709, 97387 Kourou cedex, French Guiana; email: ivan.scotti@ecofog.gf |
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Rowland, L.; Stahl, C.; Bonal, D.; Siebicke, L.; Williams, M.; Meir, P. |
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The Response of Tropical Rainforest Dead Wood Respiration to Seasonal Drought |
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Journal Article |
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2013 |
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Ecosystems |
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Ecosystems |
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16 |
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7 |
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1294-1309 |
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Amazon rainforest; coarse woody debris; respiration; seasonal drought; soil water content; woody moisture content |
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Coarse woody debris (CWD, dead wood sections ≥10 cm diameter) represents a large store of carbon in tropical forests; however, estimates of the flux of carbon from CWD in these forests remain poorly constrained. The objective of this study was to resolve the dry/wet season response of respiration in CWD (Rcwd), and investigate the importance of biotic and abiotic factors for predicting the seasonal change of Rcwd at the ecosystem level. This study presents a 4-month time series of Rcwd measurements conducted on 42 dead trees (26 species) at the Paracou Research Station in French Guiana. Rcwd measurements were repeated 13 times on each CWD sample from July to November 2011, spanning the transition from wet to dry season, and then from dry season to the following wet season. Seasonal drought caused monthly Rcwd to drop by 20.5 ± 5.1% over the wet-dry transition. Changes in woody tissue moisture content explained 41.9% of the measured seasonal variability in Rcwd, but 60% of the seasonal variability in mean forest Rcwd rates could be modelled using surface soil water content. We estimate that Rcwd is approximately 5% of annual ecosystem respiration (Reco) and that seasonal variations in Rcwd contribute appreciably to seasonal variations of Reco, and should be included in functional models simulating the response of tropical rainforest ecosystems to current and future climate. © 2013 Springer Science+Business Media New York. |
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Division of Plant Sciences, Research School of Biology, The Australian National University, ACT, Australian Capital Territory, 0200, Australia |
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Export Date: 18 October 2013; Source: Scopus; Coden: Ecosf; doi: 10.1007/s10021-013-9684-x; Language of Original Document: English; Correspondence Address: Rowland, L.; School of Geosciences, University of Edinburgh, Edinburgh, United Kingdom; email: lucy.rowland@ed.ac.uk; Funding Details: NE/F002149/1, NERC, Natural Environment Research Council; Funding Details: NE/J011002/1, NERC, Natural Environment Research Council; Funding Details: FT110100457, ARC, Australian Research Council |
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ter Steege, H.; Pitman, N.C.A.; Sabatier, D.; Baraloto, C.; Salomão, R.P.; Guevara, J.E.; Phillips, O.L.; Castilho, C.V.; Magnusson, W.E.; Molino, J.-F.; Monteagudo, A.; Núñez Vargas, P.; Montero, J.C.; Feldpausch, T.R.; Coronado, E.N.H.; Killeen, T.J.; Mostacedo, B.; Vasquez, R.; Assis, R.L.; Terborgh, J.; Wittmann, F.; Andrade, A.; Laurance, W.F.; Laurance, S.G.W.; Marimon, B.S.; Marimon, B.-H.; Guimarães Vieira, I.C.; Amaral, I.L.; Brienen, R.; Castellanos, H.; Cárdenas López, D.; Duivenvoorden, J.F.; Mogollón, H.F.; Matos, F.D. de A.; Dávila, N.; García-Villacorta, R.; Stevenson Diaz, P.R.; Costa, F.; Emilio, T.; Levis, C.; Schietti, J.; Souza, P.; Alonso, A.; Dallmeier, F.; Montoya, A.J.D.; Fernandez Piedade, M.T.; Araujo-Murakami, A.; Arroyo, L.; Gribel, R.; Fine, P.V.A.; Peres, C.A.; Toledo, M.; Aymard C., G.A.; Baker, T.R.; Cerón, C.; Engel, J.; Henkel, T.W.; Maas, P.; Petronelli, P.; Stropp, J.; Zartman, C.E.; Daly, D.; Neill, D.; Silveira, M.; Paredes, M.R.; Chave, J.; Lima Filho, D. de A.; Jørgensen, P.M.; Fuentes, A.; Schöngart, J.; Cornejo Valverde, F.; Di Fiore, A.; Jimenez, E.M.; Peñuela Mora, M.C.; Phillips, J.F.; Rivas, G.; van Andel, T.R.; von Hildebrand, P.; Hoffman, B.; Zent, E.L.; Malhi, Y.; Prieto, A.; Rudas, A.; Ruschell, A.R.; Silva, N.; Vos, V.; Zent, S.; Oliveira, A.A.; Schutz, A.C.; Gonzales, T.; Trindade Nascimento, M.; Ramirez-Angulo, H.; Sierra, R.; Tirado, M.; Umaña Medina, M.N.; van der Heijden, G.; Vela, C.I.A.; Vilanova Torre, E.; Vriesendorp, C.; Wang, O.; Young, K.R.; Baider, C.; Balslev, H.; Ferreira, C.; Mesones, I.; Torres-Lezama, A.; Urrego Giraldo, L.E.; Zagt, R.; Alexiades, M.N.; Hernandez, L.; Huamantupa-Chuquimaco, I.; Milliken, W.; Palacios Cuenca, W.; Pauletto, D.; Valderrama Sandoval, E.; Valenzuela Gamarra, L.; Dexter, K.G.; Feeley, K.; Lopez-Gonzalez, G.; Silman, M.R. |
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Hyperdominance in the Amazonian Tree Flora |
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2013 |
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Science |
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Science |
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342 |
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6156 |
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1243092 |
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The vast extent of the Amazon Basin has historically restricted the study of its tree communities to the local and regional scales. Here, we provide empirical data on the commonness, rarity, and richness of lowland tree species across the entire Amazon Basin and Guiana Shield (Amazonia), collected in 1170 tree plots in all major forest types. Extrapolations suggest that Amazonia harbors roughly 16,000 tree species, of which just 227 (1.4%) account for half of all trees. Most of these are habitat specialists and only dominant in one or two regions of the basin. We discuss some implications of the finding that a small group of species—less diverse than the North American tree flora—accounts for half of the world’s most diverse tree community. |
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Dejean, A.; Revel, M.; Azémar, F.; Roux, O. |
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Altruism during predation in an assassin bug |
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2013 |
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Naturwissenschaften |
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Naturwissenschaften |
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100 |
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10 |
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913-922 |
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Conspecific tolerance; Predation; Prey sharing; Reduviidae; Zelus annulosus |
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Zelus annulosus is an assassin bug species mostly noted on Hirtella physophora, a myrmecophyte specifically associated with the ant Allomerus decemarticulatus known to build traps on host tree twigs to ambush insect preys. The Z. annulosus females lay egg clutches protected by a sticky substance. To avoid being trapped, the first three instars of nymphs remain grouped in a clutch beneath the leaves on which they hatched, yet from time to time, they climb onto the upper side to group ambush preys. Long-distance prey detection permits these bugs to capture flying or jumping insects that alight on their leaves. Like some other Zelus species, the sticky substance of the sundew setae on their forelegs aids in prey capture. Group ambushing permits early instars to capture insects that they then share or not depending on prey size and the hunger of the successful nymphs. Fourth and fifth instars, with greater needs, rather ambush solitarily on different host tree leaves, but attract siblings to share large preys. Communal feeding permits faster prey consumption, enabling small nymphs to return sooner to the shelter of their leaves. By improving the regularity of feeding for each nymph, it likely regulates nymphal development, synchronizing molting and subsequently limiting cannibalism. © 2013 Springer-Verlag Berlin Heidelberg. |
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IRD, Maladies Infectieuses et Vecteurs, Ecologie, Genetique, Evolution et Controle (UMR-IRD 224), IRD 01, BP 171, Bobo-Dioulasso, Burkina Faso |
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Export Date: 30 October 2013; Source: Scopus; Coden: Natwa; doi: 10.1007/s00114-013-1091-9; Language of Original Document: English; Correspondence Address: Dejean, A.; Écologie des Forêts de Guyane, Campus Agronomique, BP 316, 97379 Kourou cedex, France; email: alain.dejean@wanadoo.fr |
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Michalet, S.; Rohr, J.; Warshan, D.; Bardon, C.; Roggy, J.-C.; Domenach, A.-M.; Czarnes, S.; Pommier, T.; Combourieu, B.; Guillaumaud, N.; Bellvert, F.; Comte, G.; Poly, F. |
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Phytochemical analysis of mature tree root exudates in situ and their role in shaping soil microbial communities in relation to tree N-acquisition strategy |
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2013 |
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Plant Physiology and Biochemistry |
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Plant Physiol. Biochem. |
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72 |
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169-177 |
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Chemical ecology; Denitrification; Eperua falcata; Metabolic profiling; Mycorrhizae; Plant-microbes interactions; Root exudates |
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Eperua falcata (Aublet), a late-successional species in tropical rainforest and one of the most abundant tree in French Guiana, has developed an original strategy concerning N-acquisition by largely preferring nitrate, rather than ammonium (H. Schimann, S. Ponton, S. Hättenschwiler, B. Ferry, R. Lensi, A.M. Domenach, J.C. Roggy, Differing nitrogen use strategies of two tropical rainforest tree species in French Guiana: evidence from 15N natural abundance and microbial activities, Soil Biol. Biochem. 40 (2008) 487-494). Given the preference of this species for nitrate, we hypothesized that root exudates would promote nitrate availability by (a) enhancing nitrate production by stimulating ammonium oxidation or (b) minimizing nitrate losses by inhibiting denitrification.Root exudates were collected in situ in monospecific planted plots. The phytochemical analysis of these exudates and of several of their corresponding root extracts was achieved using UHPLC/DAD/ESI-QTOF and allowed the identification of diverse secondary metabolites belonging to the flavonoid family.Our results show that (i) the distinct exudation patterns observed are related to distinct root morphologies, and this was associated with a shift in the root flavonoid content, (ii) a root extract representative of the diverse compounds detected in roots showed a significant and selective metabolic inhibition of isolated denitrifiers invitro, and (iii) in soil plots the abundance of nirK-type denitrifiers was negatively affected in rhizosphere soil compared to bulk. Altogether this led us to formulate hypothesis concerning the ecological role of the identified compounds in relation to N-acquisition strategy of this species. © 2013 Elsevier Masson SAS. |
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SOLICAZ, c/o Guyane Technopole 16 bis rue du 14 Juillet, 97300 Cayenne, French Guiana |
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Export Date: 15 November 2013; Source: Scopus; Coden: Ppbie; doi: 10.1016/j.plaphy.2013.05.003; Language of Original Document: English; Correspondence Address: Michalet, S.; Université Lyon1, CNRS, UMR5557, INRA, USC1364, Ecologie Microbienne, Centre d'Etude des Substances Naturelles, Pavillon Nétien, ISPB, 8 Avenue Rockefeller, 69373 Lyon cedex, France; email: sergemichalet@yahoo.fr |
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Vedel, V.; Rheims, C.; Murienne, J.; Brescovit, A.D. |
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Biodiversity baseline of the French Guiana spider fauna |
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2013 |
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SpringerPlus |
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SpringerPlus |
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2 |
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1-19 |
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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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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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Chartier, M.; Pélozuelo, L.; Buatois, B.; Bessière, J.-M.; Gibernau, M. |
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Geographical variations of odour and pollinators, and test for local adaptation by reciprocal transplant of two European Arum species |
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Journal Article |
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2013 |
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Functional Ecology |
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Funct. Ecol. |
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27 |
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6 |
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1367-1381 |
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Deception; Diptera; Floral scent; Geographical mosaic; Psychodidae; Sapromyophily; Transplant experiment |
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Interactions between entomophilous plants and their pollinators are one of the major factors shaping the evolution of floral features. As species are distributed in more or less connected populations, they have evolved in a geographical mosaic of co-evolution were the outcome of the plant-pollinator interaction is likely to vary as a result of local adaptations. Arum italicum and Arum maculatum are two species of Araceae which deceive their fly pollinators by mimicking the odour of their oviposition sites. Whereas A. italicum is known to be pollinated by flies belonging to different families (i.e. opportunist), A. maculatum relies on only two pollinating species of the family Psychodidae throughout its European repartition area (i.e. specialist). The interannual and geographical variations of pollinators and pollinator-attractive odours were described in several populations of the two species over two consecutive years. Furthermore, local adaptation to pollinators was tested by transplanting inflorescence-bearing plants between two different sites and by recording the number and composition of the insect fauna trapped inside the inflorescences during anthesis as a measure of a fitness component. Pollinators and pollinator-attractive odours of the two Arum species varied in time and space, but there was no clear odour structure between populations. When transplanted, inflorescences of both species trapped the same composition and number of insects as native inflorescences at a given site; this indicates that pollinator composition is highly dependent on the local availability of insects. No pattern of local adaptation was found for these two species, but local pollination conditions were shown to strongly affect the degree of geographical variations of these interactions. The lack of a clear odour geographical structure might be due to high gene flow or to similar selective pressures exerted by pollinators, and the high interindividual odour variation may be linked to the deceptive strategy adopted by the two plant species. © 2013 British Ecological Society. |
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Center for Functional and Evolutive Ecology, Université Montpellier 2, 1919 route de Mende, 34293 Montpellier, France |
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Export Date: 29 November 2013; Source: Scopus; Coden: Fecoe; doi: 10.1111/1365-2435.12122; Language of Original Document: English; Correspondence Address: Gibernau, M.; Joint Research Unit Ecology of Guiana Forests, CNRS-UMR 8172, Campus agronomique, BP 316, Kourou cedex, 97379, France; email: marc.gibernau@ecofog.gf; References: Ackerman, J.D., Cuevas, A.A., Hof, D., Are deception-pollinated species more variable than those offering a reward? (2011) Plant Systematics and Evolution, 293, pp. 91-99; Ackerman, J.D., Meléndez-Ackerman, E.J., Salguero-Faria, J., Variation in pollinator abundance and selection on fragrance phenotypes in an epiphytic orchid (1997) American Journal of Botany, 84, pp. 1383-1390; Adams, R.P., (2007) Identification of Essential Oil Components by Gas Chromatography/Mass Spectroscopy, , 4th edn. 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Diptera: Psychodidae (1989) Dipterist Digest, 4, pp. 1-83 |
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Wagner, F.; Rossi, V.; Stahl, C.; Bonal, D.; Herault, B. |
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Asynchronism in leaf and wood production in tropical forests: A study combining satellite and ground-based measurements |
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2013 |
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Biogeosciences |
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Biogeosciences |
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10 |
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11 |
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7307-7321 |
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The fixation of carbon in tropical forests mainly occurs through the production of wood and leaves, both being the principal components of net primary production. Currently field and satellite observations are independently used to describe the forest carbon cycle, but the link between satellite-derived forest phenology and field-derived forest productivity remains opaque. We used a unique combination of a MODIS enhanced vegetation index (EVI) dataset, a wood production model based on climate data and direct litterfall observations at an intra-annual timescale in order to question the synchronism of leaf and wood production in tropical forests. Even though leaf and wood biomass fluxes had the same range (respectively 2.4 ± 1.4 and 2.2 ± 0.4 Mg C ha-1 yr-1), they occurred separately in time. EVI increased with leaf renewal at the beginning of the dry season, when solar irradiance was at its maximum. At this time, wood production stopped. At the onset of the rainy season, when new leaves were fully mature and water available again, wood production quickly increased to reach its maximum in less than a month, reflecting a change in carbon allocation from short-lived pools (leaves) to long-lived pools (wood). The time lag between peaks of EVI and wood production (109 days) revealed a substantial decoupling between the leaf renewal assumed to be driven by irradiance and the water-driven wood production. Our work is a first attempt to link EVI data, wood production and leaf phenology at a seasonal timescale in a tropical evergreen rainforest and pave the way to develop more sophisticated global carbon cycle models in tropical forests. © 2013 Author(s). |
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INRA, UMR EEF 1137, 54280 Champenoux, France |
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Export Date: 2 December 2013; Source: Scopus; doi: 10.5194/bg-10-7307-2013; Language of Original Document: English; Correspondence Address: Wagner, F.; CIRAD, UMR Ecologie des Forêts de Guyane, Kourou, French Guiana, French Guiana; email: wagner.h.fabien@gmail.com; References: Allen, R., Smith, M., Pereira, L., Perrier, A., An update for the calculation of reference evapotranspiration (1994) Journal of the ICID, 43, pp. 35-92; Anderson, L.O., Biome-scale forest properties in Amazonia based on field and satellite observations (2012) Remote Sens., 4, pp. 1245-1271. , doi:10.3390/rs4051245; Arias, P.A., Fu, R., Hoyos, C.D., Li, W., Zhou, L., Changes in cloudiness over the Amazon rainforests during the last two decades: Diagnostic and potential causes (2011) Clim. Dynam., 37, pp. 1151-1164. , doi:10.1007/s00382-010-0903-2; Asner, G., Townsend, A., Braswell, B., Satellite observation of El Nino effects on Amazon forest phenology and productivity (2000) Geophys. Res. Lett., 27, pp. 981-984. , doi:10.1029/1999GL011113; Asner, G.P., Nepstad, D., Cardinot, G., Ray, D., Drought stress and carbon uptake in an Amazon forest measured with spaceborne imaging spectroscopy (2004) Proceedings of the National Academy of Sciences of the United States of America, 101 (16), pp. 6039-6044. , DOI 10.1073/pnas.0400168101; Baccini, A., Goetz, S.J., Walker, W.S., Laporte, N.T., Sun, M., Sulla-Menashe, D., Hackler, J., Houghton, R.A., Estimated carbon dioxide emissions from tropical deforestation improved by carbon-density maps (2012) Nat. Clim. 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