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Heuertz, M.; Caron, H.; Scotti-Saintagne, C.; Pétronelli, P.; Engel, J.; Tysklind, N.; Miloudi, S.; Gaiotto, F.A.; Chave, J.; Molino, J.-F.; Sabatier, D.; Loureiro, J.; Budde, K.B. |
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Title |
The hyperdominant tropical tree Eschweilera coriacea (Lecythidaceae) shows higher genetic heterogeneity than sympatric Eschweilera species in French Guiana |
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Journal Article |
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Year |
2020 |
Publication |
Plant Ecology and Evolution |
Abbreviated Journal |
Plant Ecol. Evol. |
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153 |
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1 |
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67-81 |
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Cryptic species; Eschweilera; Hyperdominant tropical trees; Microsatellites; Species complex; Species delimitation |
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Background and aims – The evolutionary history of Amazonia’s hyperabundant tropical tree species, also known as “hyperdominant” species, remains poorly investigated. We assessed whether the hyperdominant Eschweilera coriacea (DC.) S.A.Mori (Lecythidaceae) represents a single genetically cohesive species, and how its genetic constitution relates to other species from the same clade with which it occurs sympatrically in French Guiana. Methods – We sampled 152 individuals in nine forest sites in French Guiana, representing 11 species of the genus Eschweilera all belonging to the Parvifolia clade, with emphasis on E. coriacea. Samples were genotyped at four simple sequence repeat (SSR) markers. We delimited gene pools, i.e., genetically coherent putative taxa, using STRUCTURE software and principal component analysis. We compared the genetic assignment of individuals with their morphological species determination and estimated genetic diversity and differentiation for gene pools and species. We also estimated genome size using flow cytometry. Key results – SSR profiles commonly displayed up to four alleles per genotype, suggesting that the investigated Eschweilera species bear a paleopolyploid signature. Flow cytometry suggested that the studied species are diploid with haploid genome sizes of 871–1046 Mbp. We detected five gene pools and observed a good correspondence between morphological and genetic delimitation for Eschweilera sagotiana Miers and the undescribed morphospecies E. sp. 3 (which resembles E. grandiflora (Aubl.) Sandwith), and to a lesser extent for E. decolorans Sandwith and E. micrantha (O.Berg) Miers. Eschweilera coriacea was the most genetically diverse species and included individuals assigned to each gene pool. Conclusions – We found no conclusive evidence for cryptic species within E. coriacea in French Guiana. SSRs detected fewer gene pools than expected based on morphology in the Parvifolia clade but discriminated evolutionary relationships better than available plastid markers. A positive trend between demographic abundance of species and allelic richness illustrates that hyperdominants may have a high evolutionary potential. This hypothesis can be tested using more powerful genomic data in combination with tree phenotypic trait variation and characterization of niche breadth, to enhance our understanding of the causes of hyperdominance in Amazonian trees. |
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University of Copenhagen, Forest, Nature and Biomass, Rolighedsvej 23, Frederiksberg C, DK-1958, Denmark |
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Societe Royale de Botanique de Belgique |
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20323913 (Issn) |
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EcoFoG @ webmaster @ |
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928 |
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Dutech, C.; Joly, H.I.; Jarne, P. |
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Gene flow, historical population dynamics and genetic diversity within French Guianan populations of a rainforest tree species, Vouacapoua americana |
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Journal Article |
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Year |
2004 |
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Heredity |
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Heredity |
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92 |
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2 |
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69-77 |
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bottleneck; climatic change; extinction-recolonization; microsatellite; neotropical rainforest; pollen and seed dispersal |
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Both gene flow and historical events influence the genetic diversity of natural populations. One way to understand their respective impact is to analyze population genetic structure at large spatial scales. We studied the distribution of genetic diversity of 17 populations of Vouacapoua americana (Caesalpiniaceae) in French Guiana, using nine micro satellite loci. Low genetic diversity was observed within populations, with a mean allelic richness and gene diversity of 4.1 and 0.506, respectively, which could be due to low effective population size and/or past bottlenecks. Using the regression between F-st/(1-F-st), estimated between pairs of populations, and the logarithm of the geographical distance, the spatial genetic structure can partly be explained by isolation-by-distance and limited gene flow among populations. This result is in agreement with the species' biology, including seed and pollen dispersal by rodents and insects, respectively. In contrast, no clear genetic signal of historical events was found when examining genetic differentiation among populations in relation to biogeographical hypotheses or by testing for bottlenecks within populations. Our conclusion is that nuclear spatial genetic structure of V. americana, at the geographic scale of French Guiana, is better explained by gene flow rather than by historical events. |
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Cirad Foret Silvolab, Lab Genet & Ecol Mol, F-97387 Kourou, France, Email: cdutech@bordeaux.inra.fr |
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NATURE PUBLISHING GROUP |
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0018-067X |
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ISI:000188431700003 |
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EcoFoG @ eric.marcon @ |
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240 |
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Gourlet-Fleury, S.; Comu, G.; Jesel, S.; Dessard, H.; Jourget, J.G.; Blanc, L.; Picard, N. |
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Using models to predict recovery and assess tree species vulnerability in logged tropical forests: A case study from French Guiana |
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Journal Article |
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2005 |
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Forest Ecology and Management |
Abbreviated Journal |
For. Ecol. Manage. |
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209 |
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1-2 |
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69-86 |
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matrix model; individual-based spatially explicit model; regeneration; recruitment; long-term population dynamics |
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A major challenge for forest managers is to define the optimal cutting cycle to ensure that the resource is sustained in the long term. Matrix models of forest dynamics allow time-projection of diameter-class distributions and thus assessment of the time needed, after logging, to recover a given part of the exploitable stock. They are easy to build and they only require, as input variables, the diameter structure of the population(s) under scope. However, such models are based on a coarse description of tree population dynamics and must be used with caution. In particular, as trees are only described from a diameter threshold (usually 10 cm dbh), recruitment of a new tree cannot be linked with the preceding generation since too much time elapsed between seed dispersal and the installation of a 10-cm recruit. This causes predictions of matrix models to be highly questionable in the long term when ingrowth to larger dbh classes greatly depends on the way recruitment has been modelled. We used a case study from French Guiana to test whether or not a simple matrix model is reliable enough to help forest managers choose between management alternatives. We focused on the major timber species Dicorynia guianensis Amshoff (Caesalpiniaceae) harvested under a selective cutting regime. We compared predictions of D. guianensis stock recovery in the short and long term provided by two models: StoMat, a non-regulated matrix model, and SELVA, a single-tree distance dependent model explicitly simulating the entire species life cycle. Both models were independently calibrated on data from Paracou permanent sample plots. We showed that: (i) the short-term recovery of the exploitable stock predicted by StoMat is reliable for a large range of disturbance conditions; (ii) recruitment implementation in StoMat does not influence projections until the third felling cycle; (iii) for shared initial stand conditions SELVA and StoMat give consistent mid- and long-term predictions: the simple recruitment model used into StoMat could efficiently summarise the regeneration processes of the species under low felling intensity. Our results indicate that the current felling regime used in French Guiana may not be sustainable on a long-term basis. In any case, no more than 60% of the initial stock would be recovered after logging. We conclude that simple models can provide as reliable predictions as more complicated ones. They may be sufficient to assess the recovery of a species' exploitable stock even in the long term, or at least assess the (un)sustainability of particular harvesting regimes. (c) 2005 Elsevier B.V. All rights reserved. |
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CIRAD, Dept Forets, F-34398 Montpellier 5, France, Email: sylvie.gourlet-fleury@cirad.fr |
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ELSEVIER SCIENCE BV |
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0378-1127 |
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ISI:000228504600007 |
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EcoFoG @ eric.marcon @ |
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257 |
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Scotti, I.; González-Martínez, S.C.; Budde, K.B.; Lalague, H. |
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Fifty years of genetic studies: what to make of the large amounts of variation found within populations? |
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Journal Article |
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2016 |
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Annals of Forest Science |
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Annals of Forest Science |
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73 |
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1 |
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69-75 |
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Intra-specific variation; Microgeography; Natural selection; Population genomics |
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INRA, UMR745 Ecologie des Forêts de Guyane, Campus Agronomique, Kourou, French Guiana |
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Export Date: 7 March 2016 |
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EcoFoG @ webmaster @ |
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667 |
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Leroy, C.; Petitclerc, F.; Orivel, J.; Corbara, B.; Carrias, J.-F.; Dejean, A.; Céréghino, R. |
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The influence of light, substrate and seed origin on the germination and establishment of an ant-garden bromeliad |
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Journal Article |
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2017 |
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Plant Biology |
Abbreviated Journal |
Plant Biol J |
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19 |
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1 |
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70-78 |
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Aechmea mertensii; bromeliad; French Guiana; germination; plant performance; survival |
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Plant germination and development depend upon a seed's successful dispersal into a suitable habitat and its ability to grow and survive within the surrounding biotic and abiotic environment. The seeds of Aechmea mertensii, a tank-bromeliad species, are dispersed by either Camponotus femoratus or Neoponera goeldii, two ant species that initiate ant gardens (AGs). These two mutualistic ant species influence the vegetative and reproductive traits of the bromeliad through their divergent ecological preferences (i.e. light and substrate). We hypothesised that the seeds dispersed by these two ant species have underlying genetic differences affecting germination, growth and survival of A. mertensii seedlings in different ways. To test this, we used an experimental approach consisting of sowing seeds of A. mertensii: (i) taken from the two AG–ant associations (i.e. seed origin), (ii) in two contrasting light conditions, and (iii) on three different substrates. Light and substrate had significant effects on germination, survival and on eight key leaf traits reflecting plant performance. Seed origin had a significant effect only on germination and on two leaf traits (total dry mass and relative growth rate). Overall, this bromeliad performs better (i.e. high growth and survival rates) when growing both in the shade and in the carton nest developed by C. femoratus ants. These results suggest that the plasticity of the tank bromeliad A. mertensii is mainly due to environment but also to genetic differences related to seed origin, as some traits are heritable. Thus, these two ant species may play contrasting roles in shaping plant evolution and speciation. |
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1438-8677 |
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EcoFoG @ webmaster @ |
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712 |
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Author |
Herault, B. |
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Title |
Reconciling niche and neutrality through the Emergent Group approach |
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Journal Article |
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2007 |
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Perspectives in Plant Ecology Evolution and Systematics |
Abbreviated Journal |
Perspect. Plant Ecol. Evol. Syst. |
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9 |
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2 |
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71-78 |
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Biodiversity; ecological equivalency; biological traits; neutral theory; niche differentiation; redundancy |
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Both niche and neutral theories have been suggested as potential frameworks for modelling biodiversity. Niche models assume that biological traits represent evolutionary adaptations and define individuals in terms of functional trade-offs. Neutral models assume that all individuals at a single trophic level are functionally equivalent on a per capita basis with respect to their birth, death, dispersal and speciation. The opinion of many researchers is that neutral and niche processes operate simultaneously to generate diversity without knowing how the unification of both models can be achieved. Recently, several theoretical papers have reported evidence on the evolutionary emergence of niche structures shaping the emergence of groups of similar species. In this way, an Emergent Group is defined as a set of species that have a similar functional niche owing to a convergent ecological strategy. Central to the Emergent Group concept are the assumptions of functional equivalence within and of functional divergence between Emergent Groups. Within an Emergent Group, species richness is subject to a zero-sum rule set by the balance between the rate of individual loss and of immigration. Between Emergent Groups, tradeoffs such as seed size/seedling competitivity, investment in reproductive system/investment in vegetative systems or competitive ability/predator invulnerability are cornerstones of the evolutionary divergence. Delineating Emergent Groups amounts to reaching a compromise between maximizing niche differentiation (i.e. maximizing differences in functional tradeoffs) between Emergent Groups and maximizing neutrality within Emergent Groups. Up to now, the Emergent Group concept has been mostly proposed by theoretical scientists but it should be tested by empirical ecologists. The way in which niche and neutral models could be combined provides a profitable opportunity for theoretical and empirical scientists to collaborate fruitfully. (c) 2007 Rubel Foundation, ETH Zurich. Published by Elsevier GmbH. All rights reserved. |
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[Herault, Bruno] Univ Antilles Guyane, UMR Ecol Forets Guyane, F-97379 Kourou, France, Email: Bruno.Herault@cirad.fr |
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ELSEVIER GMBH, URBAN & FISCHER VERLAG |
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1433-8319 |
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ISI:000251685100002 |
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EcoFoG @ eric.marcon @ |
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147 |
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Chartier, M.; Pélozuelo, L.; Gibernau, M. |
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Do floral odor profiles geographically vary with the degree of specificity for pollinators? Investigation in two sapromyophilous Arum species (Araceae) |
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Journal Article |
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2011 |
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Annales de la Societe Entomologique de France |
Abbreviated Journal |
Ann. Soc. Entomol. Fr. |
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47 |
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1-2 |
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71-77 |
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Arum italicum; Arum maculatum; Floral scent; Psychodidae; Specificity |
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We compared floral odour profiles among populations of two Arum species which show different degrees of specificity for their fly pollinators. Insects were collected from inflorescences in four populations of Arum italicum and two populations of Arum maculatum. In six Arum populations, we compared inflorescences odour profiles collected by Solid Phase Micro Extraction (SPME) and analysed by gas chromatography. We confirmed that from a pollination point of view, A. italicum is an opportunist species, as it is mainly pollinated by insects of the families Psychodidae, Chironomidae and Sciaridae, whereas A. maculatum is a specialist species, as it is 90% pollinated by Psychodidae. In all populations, Arum italicum was less attractive to pollinators than Arum maculatum. Floral odour profiles of A. italicum were not geographically structured among populations, suggesting a high gene flow or adaptation to a fluctuant guild of pollinators. On the contrary, odour profiles of A. maculatum varied between the two populations studied suggesting a lower gene flow or adaptation to different local pollinator preferences. |
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CNRS – Ecofog (UMR 8172), BP709, F-97387 Kourou, France |
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00379271 (Issn) |
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Export Date: 26 October 2011; Source: Scopus; Language of Original Document: English; Correspondence Address: Chartier, M.; Université Paul Sabatier, Laboratoire Evolution and Diversité Biologique (UMR 5174), Bât. 4R3-B2, F-31062 Toulouse cedex 9, France; email: chartier.marion@gmail.com |
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EcoFoG @ webmaster @ |
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366 |
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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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Journal Article |
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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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00319422 (Issn) |
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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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504 |
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Herault, B.; Honnay, O. |
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Using life-history traits to achieve a functional classification of habitats |
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2007 |
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Applied Vegetation Science |
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Appl. Veg. Sci. |
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10 |
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1 |
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73-80 |
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forest connectivity; functional group; habitat typology; land-use history; riverine forest; species functional unity |
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Question: To establish a habitat classification based on functional group co-occurrence that may help the drawing up of conservation plans. Location: Riverine forest fragments in the Grand-duche de Luxembourg, Europe. Methods: Forest fragments were surveyed for their abundance of vascular plants. These were clustered into emergent groups according to 14 life-traits related to plant dispersal, establishment and persistence. Forest fragments were classified according to similar distribution of the identified emergent groups. Environmental factors were related to the emergent group richness in each forest type using generalized linear models. Results: Contrary to former species centred classifications, only two groups of forests, each with clearly different emergent group composition and conservation requirements, were detected: (1) swamp forests characterized by anemogamous perennials, annuals and hydrochorous perennials and (2) moist forests characterized by barochorous perennials, small geophytes and zoochorous phanerophytes. From a conservation point of view, priority should be given to large swamp forest with intact flooding regimes. This is in accordance with the high wind and water dispersal capacities of their typical emergent groups. For the moist forests, conservation priorities should be high forest connectivity and historical continuity since dispersal and establishment of their characteristic emergent groups are highly limited. Conclusions: The described methodology, situated at an intermediate integration level between the individual species and whole community descriptors, takes advantage of both conservation plans built for single species and the synthetic power of broad ecological measures. |
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Univ Liege, Dept Environm Sci & Management, B-6700 Arlon, Belgium, Email: bruno.herault@cirad.fr |
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OPULUS PRESS UPPSALA AB |
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1402-2001 |
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ISI:000245934700009 |
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EcoFoG @ eric.marcon @ |
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218 |
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Author |
Orivel, J.; Leroy, C. |
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Title |
The diversity and ecology of ant gardens (Hymenoptera: Formicidae; Spermatophyta: Angiospermae) |
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Journal Article |
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Year |
2011 |
Publication |
Myrmecological News |
Abbreviated Journal |
Myrmecol. News |
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Volume |
14 |
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Pages |
73-85 |
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Keywords |
Ant-plant interactions; epiphytes; mutualisms; Neotropics; Paleotropics; phytotelm; parabiosis; seed dispersal; review |
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Abstract |
Mutualistic interactions between ants and plants are important features of many ecosystems, and they can be divided into three main categories: dispersal and protective mutualisms and myrmecotrophy. In both the Neotropics and the Southeastern Asian Paleotropics, ant gardens (AGs), a particular type of ant-plant interaction, are frequent. To initiate AGs, ants integrate the seeds of certain epiphyte species into the carton of their nest. The development of the plants leads to the formation of a cluster of epiphytes rooted in the carton. They have been defined as one of the most complex associations between ants and plants known because of the plurispecific, but also specialized nature of the association involving several phylogenetically-distant ant and plant species. The aim of this review is to provide a synthesis of the diversity and ecology of AGs, including the outcomes experienced by the partners in the interaction and the direct and indirect impacts ant-garden ants have on the plant and arthropod communities. |
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Address |
[Orivel, Jerome; Leroy, Celine] CNRS, UMR Ecol Forets Guyane, Kourou 97379, French Guiana, Email: jerome.orivel@ecofog.gf |
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Publisher |
OESTERREICHISCHE GESELL ENTOMOFAUNISTIK, C/O NATURHISTOR MUSEUM WIEN |
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ISSN |
1994-4136 |
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Notes |
ISI:000286844100009 |
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EcoFoG @ webmaster @ |
Serial |
292 |
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