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Zalamea, P.C.; Munoz, F.; Stevenson, P.R.; Paine, C.E.T.; Sarmiento, C.; Sabatier, D.; Heuret, P. |
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Title |
Continental-scale patterns of Cecropia reproductive phenology: evidence from herbarium specimens |
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Journal Article |
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Year |
2011 |
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Proceedings Of The Royal Society B-Biological Sciences |
Abbreviated Journal |
Proc. R. Soc. B-Biol. Sci. |
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278 |
Issue |
1717 |
Pages |
2437-2445 |
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climate seasonality; reproductive patterns; Fourier spectral and cospectral analyses; herbarium collections; Neotropics; pioneer plants |
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Abstract |
Plant phenology is concerned with the timing of recurring biological events. Though phenology has traditionally been studied using intensive surveys of a local flora, results from such surveys are difficult to generalize to broader spatial scales. In this study, contrastingly, we assembled a continental-scale dataset of herbarium specimens for the emblematic genus of Neotropical pioneer trees, Cecropia, and applied Fourier spectral and cospectral analyses to investigate the reproductive phenology of 35 species. We detected significant annual, sub-annual and continuous patterns, and discuss the variation in patterns within and among climatic regions. Although previous studies have suggested that pioneer species generally produce flowers continually throughout the year, we found that at least one third of Cecropia species are characterized by clear annual flowering behaviour. We further investigated the relationships between phenology and climate seasonality, showing strong associations between phenology and seasonal variations in precipitation and temperature. We also verified our results against field survey data gathered from the literature. Our findings indicate that herbarium material is a reliable resource for use in the investigation of large-scale patterns in plant phenology, offering a promising complement to local intensive field studies. |
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[Zalamea, PC; Sabatier, D] IRD, UMR AMAP, F-34000 Montpellier, France, Email: camilozalamea@gmail.com |
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Royal Soc |
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0962-8452 |
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WOS:000292592000005 |
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EcoFoG @ webmaster @ |
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328 |
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Rahali, H.; Ghanem, N.; Griffe, L.; Rahali, R.; Stien, D. |
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A general approach to the quantification of resin-bound functional groups by NMR |
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Journal Article |
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2004 |
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New Journal of Chemistry |
Abbreviated Journal |
New J. Chem. |
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28 |
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11 |
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1344-1346 |
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There has been a continuing need for sensitive, accurate and rapid methods to monitor functional loading of insoluble supports for solid phase synthesis. The present articles reports our findings regarding functional group loading quantification using H-1 NMR. Results obtained for supported amino, hydroxyl and NH-Fmoc groups are in agreement with those calculated using well-established methods and demonstrate that the strategy of looking, either at the excess reagent left in solution (NH2 and OH), or at the protecting group derivatives released from the polymer (Fmoc), is a viable approach to resin loading quanti. cation. |
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Univ Montpellier 2, CNRS, UMR 5810, Lab Aminoacides Peptides & Prot, F-34095 Montpellier 05, France, Email: didier.stien@guyane.cnrs.fr |
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ROYAL SOC CHEMISTRY |
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1144-0546 |
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ISI:000224894700013 |
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EcoFoG @ eric.marcon @ |
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261 |
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Gao, H.; Grüschow, S.; Barke, J.; Seipke, R.F.; Hill, L.M.; Orivel, J.; Yu, D.W.; Hutchings, M.; Goss, R.J.M. |
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Title |
Filipins: The first antifungal “weed killers” identified from bacteria isolated from the trap-ant |
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Journal Article |
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2014 |
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RSC Advances |
Abbreviated Journal |
RSC Adv. |
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4 |
Issue |
100 |
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57267-57270 |
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Anti-fungal |
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Allomerus ants ensure that they have sufficient nitrogen in their diet by trapping and consuming other insects. In order to construct their traps, like the more extensively studied leaf cutter ants, they employ fungal farming. Pest management within these fungal cultures has been speculated to be due to the ants' usage of actinomycetes capable of producing antifungal compounds, analogous to the leafcutter ant mutualism. Here we report the first identification of a series of antifungal compounds, the filipins, and their associated biosynthetic genes isolated from a bacterium associated with this system. |
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State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of ZoologyKunming, Yunnan, China |
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Royal Society of Chemistry |
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20462069 (Issn) |
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Export Date: 20 November 2014; Coden: Rscac; Correspondence Address: Goss, R.J.M.; School of Chemistry, University of St. AndrewsUnited Kingdom; Funding Details: 311848, EC, European Commission |
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EcoFoG @ webmaster @ |
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567 |
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Lormée, Hervé ; Berzins, Rachel ; Rocheteau, Vincent ; De Coster, Fran ; Denis, Thomas ; Richard-Hanssen, Cécile |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Seasonal Variation in the Home Ranges of Black Curassow, Crax alector, in French Guiana |
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Journal Article |
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2021 |
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Tropical Conservation Science |
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14 |
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1 |
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1-10 |
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spatial ecology, Cracids, tracking, Kernel method, Home range, movement pattern |
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Cracidae is the most threatened avian family in the Neotropics, mainly because of habitat destruction, heavy hunting pressure and poaching. In French Guiana, Black Curassows are heavily hunted, although basic knowledge of the ecological and demographical traits of the species remains limited. Such a gap prevents any attempt to assess the impact of hunting and to help stakeholders to develop proposals ensuring hunting sustainability. The spatial relationship between animals and their habitat is important for conservation management, being related to population densities through complex patterns. Here, we report on a radio-tracking study of Black Curassows in tropical primary rainforest, in Nouragues National Reserve, French Guiana. The aims of the study were to estimate home range size and its variation across seasons, and to quantify movement patterns of the birds. We captured and fitted VHF tags to four adults, and tracked them for 10 to 21.5 months. Daily movements were recorded, and home ranges estimated using the Kernel Density method, for two consecutive wet seasons and one dry season. Using 95% and 50% Kernel densities, the average annual home range and core area were 96.3± 32.6 ha (SE) and 22.8 ± 2.8 ha respectively. Home ranges appeared spatially stable over the two years, and overlapped between neighbouring groups. During the dry season, Black Curassows did not migrate but tended to enlarge their home range, with greater daily movements and higher home range overlap. Although additional data are still needed, our results can help to improve the knowledge and management of this poorly studied species |
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SAGE |
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EcoFoG @ webmaster @ |
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1036 |
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Aimene, Y.; Vidal-Salle, E.; Hagege, B.; Sidoroff, F.; Boisse, P. |
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Title |
A Hyperelastic Approach for Composite Reinforcement Large Deformation Analysis |
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Journal Article |
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2010 |
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Journal of Composite Materials |
Abbreviated Journal |
J. Compos Mater. |
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44 |
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1 |
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5-26 |
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hyperelasticity; woven reinforcements; forming; fabric mechanical behavior; finite element |
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A hyperelastic constitutive model is developed for textile composite reinforcement at large strain. A potential is proposed, which is the addition of two tension and one shear energies. The proposed potential is a function of the right Cauchy Green and structural tensor invariants whose choice corresponds to textile composite reinforcement mechanical behavior which exhibits weak elongations in the fiber directions and large angular variations in the fabric plane. The model is implemented in a Vumat user routine of ABAQUS/Explicit. Some elementary tests are performed in order to identify the model and verify its validity. It is then used to simulate the hemispherical punch forming of balanced and unbalanced fabrics. A correct agreement is obtained with experimental forming processes. |
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[Aimene, Y.; Vidal-Salle, E.; Boisse, P.] Univ Lyon, INSA Lyon, LaMCoS, F-69621 Villeurbanne, France, Email: philippe.boisse@insa-lyon.fr |
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SAGE PUBLICATIONS LTD |
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0021-9983 |
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ISI:000273509100001 |
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EcoFoG @ eric.marcon @ |
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84 |
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Delaval, M.; Charles-Dominique, P. |
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Edge effects on frugivorous and nectarivorous bat communities in a neotropical primary forest in French Guiana |
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Journal Article |
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2006 |
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Revue d'Ecologie (La Terre et la Vie) |
Abbreviated Journal |
Rev. Ecol.-Terre Vie |
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61 |
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4 |
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343-352 |
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The impact of a road crossing a continuous Guyana primary forest was studied through the analysis of qualitative and quantitative changes in a frugivorous and nectarivorous bat community at different distances from forest edge. Bats were captured along three 3-km forest transects perpendicular to the edge, and at the Nouragues Station located 150 km in the interior of the primary forest block, in an uninhabited area. Along the 3-km transects, we caught over seven times more individuals than in primary forest, this value decreasing according to the distance from the edge. Moreover, at the very edge, species richness was higher than along transects, probably due to exchanges between primary forest and the open habitats. On the contrary, diversity values at forest edges were lower than in primary forest, with a demographic explosion of a few opportunistic phyllostomid species such as Carollia perspicillata and Artibeus jamaicensis. Species restricted to degraded habitat like Glossophaga soricina and Artibeus cinereus were still present 3 km away from the edge, where the proportion of C perspicillata was seven times higher than in primary forest at Nouragues. These changes in the community of bats have important consequences on seed and pollen dispersal. So edge effects may significantly affect both faunal and floral assemblage. We conclude that changes in bat community occur up to at least 3 km from forest edge, i. e. at a greater distance than that found for all other vertebrates previously studied. By their implications our results should be considered in habitat and species conservation management plans. |
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Dept Ecol & Gest Biodivers, UMR 5176, F-91800 Brunoy, France, Email: marguerite.delaval@wanadoo.fir |
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SOC NATL PROTECTION NATURE ACCLIMATATION FRANCE |
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0249-7395 |
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ISI:000244361200003 |
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EcoFoG @ eric.marcon @ |
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168 |
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Delaval, M.; Henry, M.; Charles-Dominique, P. |
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Interspecific competition and niche partitioning: Example of a neotropical rainforest bat community |
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Journal Article |
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2005 |
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Revue d'Ecologie (La Terre et la Vie) |
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Rev. Ecol.-Terre Vie |
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60 |
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2 |
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149-165 |
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To understand the organization of a bat community and the coexistence of sympatric species, it is essential to understand how species use and share common resources. First, we describe a bat community in a primary rainforest of French Guiana. The presence of particular roosting sites, such as caves, and the absence of disturbances are important local factors in structuring communities. In the course of this study, we focused on the three most common species of three vegetarian bat guilds (understorey frugivores, canopy frugivores and nectarivores). The local coexistence of these species is possible thanks to space, food and/or time partitioning. Space partitioning is consistent with the hypothesis that smaller bats with a more manoeuvrable flight tend to occupy more cluttered space less attractive to their competitors and have smaller home range. We observed a time partitioning that is likely to reduce competition among some frugivorous bat species by reducing direct interference during foraging. Besides an interest for the field community ecology, this study of a community living in a primary forest can be used as a reference for non disturbed habitat for conservation purposes. |
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Dept Ecol & Gestion Biodivers, UMR 5176, F-91800 Brunoy, France, Email: marguerite.delaval@wanadoo.fr |
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SOC NATL PROTECTION NATURE ACCLIMATATION FRANCE |
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0249-7395 |
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ISI:000230973300005 |
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EcoFoG @ eric.marcon @ |
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231 |
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Scotti, I.; Delph, L.F. |
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Selective trade-offs and sex-chromosome evolution in Silene latifolia |
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Journal Article |
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2006 |
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Evolution |
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Evolution |
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60 |
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9 |
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1793-1800 |
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antagonistic genes; linkage map; quantitative trait loci; sex-specific expression; Y chromosome |
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Alleles of sexually antagonistic genes (i.e., genes with alleles affecting fitness in opposite directions in the two sexes) can avoid expression in the sex to which they are detrimental via two processes: they are subsumed into the nonrecombining, sex-determining portion of the sex chromosomes or they evolve sex-limited expression. The former is considered more likely and leads to Y-chromosome degeneration. We mapped quantitative trait loci of major effect for sexually dimorphic traits of Silene latifolia to the recombining portions of the sex chromosomes and found them to exhibit sex-specific expression, with the Y chromosome in males controlling a relatively larger proportion of genetic variance than the X in females and the average autosome. Both reproductive and ecophysiological traits map to the recombining region of the sex chromosomes. We argue that genetic correlations among traits maintain recombination and polymorphism for these genes because of balancing selection in males, whereas sex-limited expression represses detrimental alleles in females. Our data suggest that the Y chromosome of S. latifolia plays a major role in the control of key metabolic activities beyond reproductive functions. |
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Indiana Univ, Dept Biol, Bloomington, IN 47405 USA, Email: ivan.scotti@kourou.cirad.fr |
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SOC STUDY EVOLUTION |
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0014-3820 |
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ISI:000241226800005 |
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EcoFoG @ eric.marcon @ |
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174 |
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Dutech, C.; Maggia, L.; Tardy, C.; Joly, H.I.; Jarne, P. |
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Tracking a genetic signal of extinction-recolonization events in a neotropical tree species: Vouacapoua americana aublet in french guiana |
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Journal Article |
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2003 |
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Evolution |
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Evolution |
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57 |
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12 |
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2753-2764 |
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allelic richness; caesalpinioideae; chloroplast DNA; climatic changes; cytonuclear disequilibrium; legummosae; microsatellite loci; tropical rainforest |
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Drier periods from the late Pleistocene and early Holocene have been hypothesized to have caused the disappearance of various rainforest species over large geographical areas in South America and restricted the extant populations to mesic sites. Subsequent improvement in climatic conditions has been associated with recolonization. Changes in population size associated with these extinction-recolonization events should have affected genetic diversity within species. However, these historical hypotheses and their genetic consequences have rarely been tested in South America. Here, we examine the diversity of the chloroplast and nuclear genomes in a Neotropical rainforest tree species, Vouacapoua americana (Leguminosae, Caesalpinioideae) in French Guiana. The chloroplast diversity was analyzed using a polymerase chain reaction-restriction fragment length polymorphism method (six pairs of primers) in 29 populations distributed over most of French Guiana, and a subset of 17 populations was also analyzed at nine polymorphic microsatellite loci. To determine whether this species has experienced extinction-recolonization, we sampled populations in areas supposedly not or only slightly affected by climatic changes, where the populations would not have experienced frequent extinction, and in areas that appear to have been recently recolonized. In the putatively recolonized areas, we found patches of several thousands of hectares homogeneous for chloroplast variation that can be interpreted as the effect of recolonization processes from several geographical origins. In addition, we observed that, for both chloroplast and nuclear genomes, the populations in newly recolonized areas exhibited a significantly smaller allelic richness than others. Controlling for geographic distance, we also detected a significant correlation between chloroplast and nuclear population differentiation. This result indicates a cytonuclear disequilibrium that can be interpreted as a historical signal of a genetic divergence between fragmented populations. In conclusion, the spatial genetic structure of contemporary V. americana populations shows evidence that this species has experienced large extinction-recolonization events, which were possibly caused by past climatic change. |
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CIRAD Foret, Silvolab, Ecol Mol, F-97387 Kourou, France, Email: laruent.maggia@cirad.fr |
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SOC STUDY EVOLUTION |
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0014-3820 |
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ISI:000188061800007 |
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EcoFoG @ eric.marcon @ |
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241 |
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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. |
![goto web page (via DOI) doi](img/doi.gif)
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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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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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Abstract |
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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no |
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EcoFoG @ webmaster @ |
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928 |
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