Evidence of low gene flow in a neotropical clustered tree species in two rainforest stands of French Guiana

Dutech, Cyril; Seiter, J.; Pétronelli, Pascal; Joly, Hélène; Jarne, Philippe

doi:10.1046/j.1365-294x.2002.01475.x

Cited by 73 publications

(68 citation statements)

References 76 publications

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“…The Sp values observed in this study, reflecting significant levels of SGS for both populations, are among the highest observed in tree species (see Table 1; Vekemans and Hardy, 2004) and similar to those observed for Vouacapoua americana, which is a tropical hardwood, also characterized as an outcrosser (Dutech et al, 2002). Our findings may have been influenced by the exhaustive sampling strategy we adopted, as well as the ecology of the species.…”

Section: Discussionsupporting

confidence: 83%

Distribution and fine-scale spatial-genetic structure in British wild cherry (Prunus avium L.)

et al. 2007

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Insights into the within-population spatial-genetic structure (SGS) of forest tree species, where little is known regarding seed and pollen dispersal patterns, enhance understanding of their ecology and provide information of value in conservation and breeding. This study utilised 13 polymorphic simple sequence repeat loci to investigate the impact of asexual recruitment, management regime and tree size on the development of SGS in wild cherry (Prunus avium L). Only 246 genotypes were identified in the 551 trees sampled, reflecting significant levels of clonal reproduction in both managed and unmanaged populations. Naturally regenerated wild cherry was spatially aggregated under both management regimes. However, in the managed population, sexually derived trees accounted for a greater proportion of the smaller size classes, whereas vegetatively produced trees dominated the smaller size classes in the unmanaged population. High overall SGS values (Sp 0.030-Sp 0.045) were observed when considering only sexually derived genets and kinship coefficients were significant up to the 120 m distance class for both populations. The inclusion of clonal ramets in the analysis significantly increased the overall SGS (Sp 0.089-Sp 0.119) as well as kinship coefficients in the 40-80 m distance classes, illustrating the dramatic impact of vegetative propagation on SGS in this species. Increased spatial aggregation and regeneration appeared to be concomitant with increased SGS in the 40 m distance class in the unmanaged population. Neighbourhood size estimates were relatively small for both populations and kinship coefficients were found to decline with distance under both management regimes, suggesting that common mechanisms may restrict gene dispersal in wild cherry.

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Section: Discussionsupporting

confidence: 83%

Distribution and fine-scale spatial-genetic structure in British wild cherry (Prunus avium L.)

et al. 2007

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“…The availability of highly variable molecular markers has facilitated the analysis of fine-scale genetic structure in natural tree populations. The fine-scale structure has been found in some forest tree species (Sork et al, 1993;Berg and Hamrick, 1995;Streiff et al, 1998;Dutech et al, 2002;Hardy et al, 2006). These tree species are characterized by either limited seed dispersal or restricted pollen and seed dispersal.…”

Section: Introductionmentioning

confidence: 99%

Joint analysis of spatial genetic structure and inbreeding in a managed population of Scots pine

et al. 2009

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We have investigated the fine-scale spatial genetic structure in a managed Scots pine forest. For this purpose, we perform a Bayesian genetic-cluster analysis of 96 geographically mapped individual seed trees of Swedish Scots pine based on 14 microsatellite loci. The analysis was carried out with the recently developed program GENECLUST (François et al., 2006), which provides the facility to jointly incorporate both spatial information from a geographical neighborhood structure through a Potts-Dirichlet model and account for variable degrees of inbreeding within the clusters. To evaluate whether inbreeding and spatial interaction should be included in the best-fitting statistical model for our data, we used the deviance information criterion (DIC), a weighted measure of model fit that accounts for an effective number of free parameters in a model. Analysis shows that a model with a single estimated cluster, with high levels of inbreeding (0.25) and with a moderate amount of spatial dependency within the unique cluster (C ¼ 0.2-0.4), best explains the data. We also carried out Bayesian parentage analysis, which enabled us to exclude the possibility that the sample constitutes one single full-sib family.

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“…II), which varied from 0.026 to 0.168, should be considered as low to high. Dutech et al [12,13] found in Vacapoua americana values from 0.008 to 0.195, and a high genetic differentiation among patches, with a global Fst of 0.11.…”

Section: Population Structurementioning

confidence: 98%

Diversité et structuration génétiques dans des populations naturelles de cacaoyers (Theobroma cacao L.) en Guyane française

Lachenaud

Zhang

2008

Ann. For. Sci.

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-The native cacao trees (Theobroma cacao L.) in south-eastern French Guiana represent a noteworthy fraction of the genetic diversity of this species. Several scientific surveys have led to the collection of numerous accessions, which provides an opportunity for investigating the pattern of genetic diversity in natural populations. Using a capillary electrophoresis genotyping system, we fingerprinted 189 wild trees in 18 natural populations. Based on the 15 loci SSR profiles, we analyzed the intra-and inter-population variation and their relationship with control clones. The global allelic richness was 4.87 alleles per locus, but was 2.4 on average within individual populations; gene diversity was 0.368 and observed heterozygosity was low (0.160). Major structuring was discovered in the metapopulation of French Guianan wild cacao trees (Fst = 0.20), which could be explained by the biological characteristics of the cacao tree and the climatic events that affected the Guianan forests in the Quaternary period.cocoa / genetic diversity / population structure / fingerprinting / French Guiana Résumé -Diversité et structuration génétiques dans des populations naturelles de cacaoyers (Theobroma cacao L.) en Guyane française. Les cacaoyers spontanés (Theobroma cacao L.) du sud-est de la Guyane française représentent une part notable de la diversité génétique de l'espèce. Plusieurs prospections ont permis la collection de nombreuses accessions, permettant l'étude de la structuration de la diversité dans les populations naturelles. Cent quatre-vingt-neuf cacaoyers spontanés, issus de 18 populations, ont été génotypés grâce à un séquenceur capillaire. Les profils obtenus avec 15 marqueurs SSR ont permis d'analyser les variations intra et inter populations, et leurs relations avec des clones témoins. La richesse allélique globale est de 4,87 allèles par locus, mais de 2,4 en moyenne dans les populations ; la diversité génique est de 0,368 et l'hétérozygotie observée est faible (0,160). Une importante structuration existe dans la métapopulation de cacaoyers spontanés Guyanais, avec un Fst de 0,20, qui pourrait s'expliquer par les caractéristiques biologiques du cacaoyer et les événements climatiques ayant affecté les forêts guyanaises au Quaternaire.cacao / diversité génétique / structuration génétique / génotypage / Guyane française

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Evidence of low gene flow in a neotropical clustered tree species in two rainforest stands of French Guiana

Cited by 73 publications

References 76 publications

Distribution and fine-scale spatial-genetic structure in British wild cherry (Prunus avium L.)

Distribution and fine-scale spatial-genetic structure in British wild cherry (Prunus avium L.)

Joint analysis of spatial genetic structure and inbreeding in a managed population of Scots pine

Diversité et structuration génétiques dans des populations naturelles de cacaoyers (Theobroma cacao L.) en Guyane française

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