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Rockwell, C.A.; Kainer, K.A.; Staudhammer, C.L.; Baraloto, C. |
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Title  |
Future crop tree damage in a certified community forest in southwestern Amazonia |
Type |
Journal Article |
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Year |
2007 |
Publication |
Forest Ecology and Management |
Abbreviated Journal |
For. Ecol. Manage. |
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Volume |
242 |
Issue |
2-3 |
Pages |
108-118 |
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Keywords |
bamboo; community forest management; forest certification; Guadua; liana; marking; reduced-impact logging; RIL; timber management; tropical forest |
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Abstract |
Field studies in Acre, Brazil assessed logging impacts of a certified community timber management project. The main objectives of the study were: (1) to determine if damage incidence to future crop trees (FCTs; >= 20 cm diameter at breast height (dbh)) differs between (a) forest with and without bamboo (Guadua spp.), and (b) trees with and without lianas; (2) to what extent harvesting can be conducted more intensely (m(3)ha(-1)), without incurring greater FCT damage; and (3) to what extent marking diminishes FCT damage. Full inventories of FCTs of 50 commercial species complexes were conducted before and after logging in 50 m-radius zones of impact around each designated harvest tree in three 10 ha (200 m x 500 m) logging blocks. We also mapped all forested areas potentially influenced by logging, including skid trails, log landings and felling gaps, throughout the 30 ha logged. More than 28% of the forest area was disturbed by logging, with 12.1% in skid trails and 16.8% in gap clearings, indicating that the forest gap mosaic can be significantly altered even when reduced-impact logging guidelines are followed. Overall, 15% of FCTs inventoried were damaged. Damage rates were not significantly reduced by marking treatment, location in bamboo-dominated forest, or liana load on FCT damage. Harvest intensity did not influence the probability of FCT damage. For future studies, it would be prudent to address impacts of timber extraction on other livelihood activities, such as non-timber forest product collection, particularly in such regions as the Brazilian Amazon, where many communities are attempting to integrate a suite of income-generating activities. (C) 2007 Elsevier B.V. All rights reserved. |
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Univ Florida, Sch Forest Resources & Conservat, Gainesville, FL 32611 USA, Email: crockwel@ufl.edu |
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ELSEVIER SCIENCE BV |
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0378-1127 |
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ISI:000246268100003 |
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EcoFoG @ eric.marcon @ |
Serial |
217 |
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Author |
Veron, V.; Caron, H.; Degen, B. |
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Title |
Gene flow and mating system of the tropical tree Sextonia rubra |
Type |
Journal Article |
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Year |
2005 |
Publication |
Silvae Genetica |
Abbreviated Journal |
Silvae Genet. |
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Volume |
54 |
Issue |
6 |
Pages |
275-280 |
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Keywords |
genetic diversity; gene flow; heterozygosity; microsatellites; mixed mating; tropical tree; twogener |
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Abstract |
In this paper we report a study of the mating system and gene flow of Sextonia rubra, a hermaphroditic, insect pollinated tropical tree species with a geographic distribution in the Guyana Plateau and the Amazon. Using five microsatellites we analysed 428 seeds of 27 open pollinated families at the experimental site “Paracou” in French Guiana. We observed, compared to other tropical tree species, a high level of genetic diversity. We estimated parameters of the mating system and gene flow by using the mixed mating model and the TwoGener approach. The estimated multilocus outcrossing rate, t(m), was 0.992 indicating nearly complete outcrossing. A significant level of biparental inbreeding and a:small proportion. of full-sibs were estimated for the 27 seed arrays. The differentiation of allelic frequencies among the pollen pools was (Phi(FT) = 0.061. We estimated mean pollen dispersal distances between 65 m and 89 m according to the dispersal models used. The joint estimation of pollen dispersal and density of reproductive trees gave an effective density estimate of 2.1-2.2 trees/ha. |
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Address |
INRA, UMR, ECOFOG, Kourou 9738, French Guiana, Email: b.degen@holz.uni-hamburg.de |
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J D SAUERLANDERS VERLAG |
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0037-5349 |
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ISI:000235239400005 |
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EcoFoG @ eric.marcon @ |
Serial |
182 |
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Author |
Dutech, C.; Joly, H.I.; Jarne, P. |
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Title |
Gene flow, historical population dynamics and genetic diversity within French Guianan populations of a rainforest tree species, Vouacapoua americana |
Type |
Journal Article |
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Year |
2004 |
Publication |
Heredity |
Abbreviated Journal |
Heredity |
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Volume |
92 |
Issue |
2 |
Pages |
69-77 |
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Keywords |
bottleneck; climatic change; extinction-recolonization; microsatellite; neotropical rainforest; pollen and seed dispersal |
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Abstract |
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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ISSN |
0018-067X |
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Notes |
ISI:000188431700003 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
240 |
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Author |
Marcon, E.; Scotti, I.; Herault, B.; Rossi, V.; Lang, G. |
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Title |
Generalization of the partitioning of Shannon diversity |
Type |
Journal Article |
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Year |
2014 |
Publication |
PLoS ONE |
Abbreviated Journal |
PLoS ONE |
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Volume |
9 |
Issue |
3 |
Pages |
e90289 |
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Abstract |
Traditional measures of diversity, namely the number of species as well as Simpson's and Shannon's indices, are particular cases of Tsallis entropy. Entropy decomposition, i.e. decomposing gamma entropy into alpha and beta components, has been previously derived in the literature. We propose a generalization of the additive decomposition of Shannon entropy applied to Tsallis entropy. We obtain a self-contained definition of beta entropy as the information gain brought by the knowledge of each community composition. We propose a correction of the estimation bias allowing to estimate alpha, beta and gamma entropy from the data and eventually convert them into true diversity. We advocate additive decomposition in complement of multiplicative partitioning to allow robust estimation of biodiversity. © 2014 Marcon et al. |
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Address |
INRA, UMR 518 Math. Info. Appli, Paris, France |
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Public Library of Science |
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19326203 (Issn) |
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Notes |
Export Date: 18 April 2014; Source: Scopus; Art. No.: e90289; Coden: Polnc; Language of Original Document: English |
Approved |
no |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
538 |
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Author |
Ciminera, M.; Auger-Rozenberg, M.-A.; Caron, H.; Herrera, M.; Scotti-Saintagne, C.; Scotti, I.; Tysklind, N.; Roques, A. |
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Title |
Genetic Variation and Differentiation of Hylesia metabus (Lepidoptera: Saturniidae): Moths of Public Health Importance in French Guiana and in Venezuela |
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Journal Article |
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Year |
2019 |
Publication |
Journal of medical entomology |
Abbreviated Journal |
J. Med. Entomol. |
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Volume |
56 |
Issue |
1 |
Pages |
137-148 |
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Abstract |
Hylesia moths impact human health in South America, inducing epidemic outbreaks of lepidopterism, a puriginous dermatitis caused by the urticating properties of females' abdominal setae. The classification of the Hylesia genus is complex, owing to its high diversity in Amazonia, high intraspecific morphological variance, and lack of interspecific diagnostic traits which may hide cryptic species. Outbreaks of Hylesia metabus have been considered responsible for the intense outbreaks of lepidopterism in Venezuela and French Guiana since the C20, however, little is known about genetic variability throughout the species range, which is instrumental for establishing control strategies on H. metabus. Seven microsatellites and mitochondrial gene markers were analyzed from Hylesia moths collected from two major lepidopterism outbreak South American regions. The mitochondrial gene sequences contained significant genetic variation, revealing a single, widespread, polymorphic species with distinct clusters, possibly corresponding to populations evolving in isolation. The microsatellite markers validated the mitochondrial results, and suggest the presence of three populations: one in Venezuela, and two in French Guiana. All moths sampled during outbreak events in French Guiana were assigned to a single coastal population. The causes and implications of this finding require further research. |
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INRA, Unité de Recherche Ecologie des forêts méditerranéennes, Avignon, UR629, France |
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NLM (Medline) |
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19382928 (Issn) |
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Notes |
Export Date: 1 February 2019 |
Approved |
no |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
857 |
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Author |
Scotti, I.; Calvo-Vialettes, L.; Scotti-Saintagne, C.; Citterio, M.; Degen, B.; Bonal, D. |
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Title |
Genetic variation for growth, morphological, and physiological traits in a wild population of the Neotropical shade tolerant rainforest tree Sextonia rubra (Mez) van der Werff (Lauraceae) |
Type |
Journal Article |
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Year |
2010 |
Publication |
Tree Genetics & Genomes |
Abbreviated Journal |
Tree Genet. Genomes |
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Volume |
6 |
Issue |
2 |
Pages |
319-329 |
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Keywords |
Ecophysiological traits; Heritability; Guiana shield; Amazon; Ecological genetics |
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Abstract |
Quantitative genetic diversity is a fundamental component of the interaction between natural populations and their environment. In breeding programmes, quantitative genetic studies on tropical trees have so far focused on fast-growing, light-demanding species, but no information exists on shade-tolerant, slow-growing species. For this study, 27 3-year-old open-pollinated families of the Neotropical shade-tolerant rainforest tree Sextonia rubra were measured in semicontrolled conditions for 20 morphological, growth, and photosynthesis traits; the effect of genetic relatedness, habitat of provenance, and mother tree status on seedling traits was analysed. Nine traits displayed significant genetic effects, while mother tree status and habitat effects were not significant (P > 0.05) for an y trait. Estimated heritability varied between 0.14 and 0.28, with growth-related traits having the highest values. Additive genetic variation correlated positively with nonheritable variation, suggesting that ecological-evolutionary factors increasing or decreasing additive genetic variance may also affect nonheritable variation in the same direction. Our results suggest that quantitative genetic variability should be taken into account in ecological studies on, and in the management of, natural tropical rainforests; further research is needed to investigate genetic x environment interactions, in particular from the point of view of the genetic response of shade-tolerant plant species to variations in light availability. |
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Address |
[Scotti, Ivan; Scotti-Saintagne, Caroline; Bonal, Damien] INRA, Unite Mixte Rech Ecol Forets Guyane, Kourou 97387, French Guiana, Email: ivan.scotti@ecofog.gf |
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Publisher |
SPRINGER HEIDELBERG |
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ISSN |
1614-2942 |
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Notes |
ISI:000274112600015 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
68 |
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Author |
Vendramin, G.G.; Fady, B.; Gonzalez-Martinez, S.C.; Hu, F.S.; Scotti, I.; Sebastiani, F.; Soto, A.; Petit, R.J. |
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Title |
Genetically depauperate but widespread: The case of an emblematic mediterranean pine |
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Journal Article |
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Year |
2008 |
Publication |
Evolution |
Abbreviated Journal |
Evolution |
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Volume |
62 |
Issue |
3 |
Pages |
680-688 |
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Keywords |
chloroplast microsatellites; conservation genetics; diversity depletion; human impact; Pinus pinea |
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Abstract |
Genetic variation is generally considered a prerequisite for adaptation to new environmental conditions. Thus the discovery of genetically depauperate but geographically widespread species is unexpected. We used 12 paternally inherited chloroplast microsatellites to estimate population genetic variation across the full range of an emblematic circum-Mediterranean conifer, stone pine (Pinus pinea L.). The same chloroplast DNA haplotype is fixed in nearly all of the 34 investigated populations. Such a low level of variation is consistent with a previous report of very low levels of diversity at nuclear loci in this species. Stone pine appears to have passed through a severe and prolonged demographic bottleneck, followed by subsequent natural- and human-mediated dispersal across the Mediterranean Basin. No other abundant and widespread plant species has as little genetic diversity as P. pinea at both chloroplast and nuclear markers. However, the species harbors a nonnegligible amount of variation at adaptive traits. Thus a causal relationship between genetic diversity, as measured by marker loci, and the evolutionary precariousness of a species, cannot be taken for granted. |
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Address |
[Vendramin, Giovanni G.] Ist Genet Vegetale, Sez Firenze, Florence, Italy, Email: petit@pierroton.inra.fr |
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BLACKWELL PUBLISHING |
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ISSN |
0014-3820 |
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Notes |
ISI:000253758600016 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
141 |
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Author |
Scotti-Saintagne, C.; Mariette, S.; Porth, I.; Goicoechea, P.G.; Barreneche, T.; Bodenes, K.; Burg, K.; Kremer, A. |
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Title |
Genome scanning for interspecific differentiation between two closely related oak species [Quercus robur L. and Q petraea (Matt.) Liebl.] |
Type |
Journal Article |
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Year |
2004 |
Publication |
Genetics |
Abbreviated Journal |
Genetics |
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Volume |
168 |
Issue |
3 |
Pages |
1615-1626 |
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Abstract |
Interspecific differentiation values (G(ST)) between two closely related oak species (Quercus petraea and Q. robur) were compiled across different studies with the aim to explore the distribution of differentiation at the genome level. The study was based on a total set of 389 markers (isozymes, AFLPs, SCARs, microsatellites, and SNPs) for which allelic frequencies were estimated in pairs of populations sampled throughout the sympatric distribution of the two species. The overall distribution of GST values followed an L-shaped curve with most markers exhibiting low species differentiation (G(ST) < 0.01) and only a few loci reaching >10% levels. Twelve percent of the loci exhibited significant G(ST) deviations to neutral expectations, suggesting that selection contributed to species divergence. Coding regions expressed higher differentiation than noncoding regions. Among the 389 markers, 158 could be mapped on the 12 linkage groups of the existing Q. robur genetic map. Outlier loci with large G, values were distributed over 9 linkage groups. One cluster of three outlier loci was found within 0.51 cM; but significant autocorrelation of GST was observed at distances <2 cM. The size and distribution of genomic regions involved in species divergence are discussed in reference to hitchhiking effects and disruptive selection. |
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Address |
INRA, UMR Biodivers Genes & Ecosyst, F-33612 Cestas, France, Email: kremer@pierronton.inra.fr |
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GENETICS |
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ISSN |
0016-6731 |
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Notes |
ISI:000225767400041 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
258 |
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Author |
Malé, P.-J.G.; Bardon, L.; Besnard, G.; Coissac, E.; Delsuc, F.; Engel, J.; Lhuillier, E.; Scotti-Saintagne, C.; Tinaut, A.; Chave, J. |
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Title |
Genome skimming by shotgun sequencing helps resolve the phylogeny of a pantropical tree family |
Type |
Journal Article |
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Year |
2014 |
Publication |
Molecular Ecology Resources |
Abbreviated Journal |
Mol. Ecol. Resour. |
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Volume |
14 |
Issue |
5 |
Pages |
966-975 |
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Keywords |
Next-generation sequencing; Organellar genome; Phylogenomics; Tropical trees |
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Abstract |
Whole genome sequencing is helping generate robust phylogenetic hypotheses for a range of taxonomic groups that were previously recalcitrant to classical molecular phylogenetic approaches. As a case study, we performed a shallow shotgun sequencing of eight species in the tropical tree family Chrysobalanaceae to retrieve large fragments of high-copy number DNA regions and test the potential of these regions for phylogeny reconstruction. We were able to assemble the nuclear ribosomal cluster (nrDNA), the complete plastid genome (ptDNA) and a large fraction of the mitochondrial genome (mtDNA) with approximately 1000×, 450× and 120× sequencing depth respectively. The phylogenetic tree obtained with ptDNA resolved five of the seven internal nodes. In contrast, the tree obtained with mtDNA and nrDNA data were largely unresolved. This study demonstrates that genome skimming is a cost-effective approach and shows potential in plant molecular systematics within Chrysobalanaceae and other under-studied groups. © 2014 John Wiley & Sons Ltd. |
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Address |
GeT-PlaGe, Genotoul, INRA Auzeville, Castanet-Tolosan, F-31326, France |
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Blackwell Publishing Ltd |
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17550998 (Issn) |
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Notes |
Export Date: 1 September 2014; Correspondence Address: Malé, P.-J.G.; UMR 5174 Laboratoire Évolution and Diversité Biologique, CNRS, Université Paul Sabatier, ENFA, 118 route de Narbonne, Toulouse, F-31062, France; email: pjg.male@gmail.com |
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EcoFoG @ webmaster @ |
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559 |
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Author |
Woolfit, M.; Iturbe-Ormaetxe, I.; Brownlie, J.C.; Walker, T.; Riegler, M.; Seleznev, A.; Popovici, J.; Rancès, E.; Wee, B.A.; Pavlides, J.; Sullivan, M.J.; Beatson, S.A.; Lane, A.; Sidhu, M.; McMeniman, C.J.; McGraw, E.A.; O'Neill, S.L. |
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Title |
Genomic evolution of the pathogenic Wolbachia strain, wMelPop |
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Journal Article |
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Year |
2013 |
Publication |
Genome Biology and Evolution |
Abbreviated Journal |
Genome Biolog. Evol. |
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Volume |
5 |
Issue |
11 |
Pages |
2189-2204 |
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Keywords |
Endosymbiont; Evolution; Genomics; Wolbachia |
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Abstract |
Most strains of the widespread endosymbiotic bacterium Wolbachia pipientis are benign or behave as reproductive parasites. The pathogenic strain wMelPop is a striking exception, however: it overreplicates in its insect hosts and causes severe life shortening. The mechanism of this pathogenesis is currently unknown. We have sequenced the genomes of three variants of wMelPop and of the closely related nonpathogenic strain wMelCS. We show that the genomes of wMelCS and wMelPop appear to be identical in the nonrepeat regions of the genome and differ detectably only by the triplication of a 19-kb region that is unlikely to be associated with life shortening, demonstrating that dramatic differences in the host phenotype caused by this endosymbiont may be the result of only minor genetic changes. We also compare the genomes of the original wMelPop strain from Drosophila melanogaster and two sequentialderivatives, wMelPop-CLA and wMelPop-PGYP. To develop wMelPop as a novel biocontrol agent, it was first transinfected into and passaged in mosquito cell lines for approximately 3.5 years, generating wMelPop-CLA. This cell line-passaged strain was then transinfected into Aedesaegypti mosquitoes, creating wMelPop-PGYP,which wassequenced after 4yearsin the insecthost. We observe a rapid burst of genomic changes during cell line passaging, but no further mutations were detected after transinfection into mosquitoes, indicating either that host preadaptation had occurred in cell lines, that cell lines are a more selectively permissive environment than animal hosts, or both. Our results provide valuable data on the rates of genomic and phenotypic change in Wolbachia associated with host shifts over short time scales. © The Author(s) 2013. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. |
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Institute for Molecular Bioscience, University of Queensland, Brisbane, Australia |
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Export Date: 9 February 2014; Source: Scopus; Language of Original Document: English; Correspondence Address: O'Neill, S.L.; School of Biological Sciences, Monash University, Clayton, VIC, Australia; email: scott.oneill@monash.edu; Funding Details: NIH, National Institutes of Health |
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