Demographic Genetics of the Japanese Beech, <i>Fagus crenata</i>, at Ogawa Forest Preserve, Ibaraki, Central Honshu, Japan. I. Spatial Genetic Substructuring in Local Populations

Kitamura, Keiko; Shimada, Kenichi; Nakashima, Kiyoshi; Kawano, Shoichi

doi:10.1111/j.1442-1984.1997.tb00162.x

Cited by 27 publications

(18 citation statements)

References 59 publications

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“…Differences in the size‐class structures of local populations reflect their life history processes and regeneration strategies (Kawano & Kitamura 1997; Kitamura et al 1997a,b; Kitamura et al 2000; Kitamura & Kawano 2001). In the present study, a high level of similarity among size‐class genetic components at WG1, GS1 and GS2 suggests that offshoot formation by root sucker plays a significant role in stand development and maintenance.…”

Section: Discussionmentioning

confidence: 99%

Demographic genetics of the American beech, Fagus grandifolia. II. Genet substructure of populations for the Blue Ridge, Piedmont and the Great Smoky Mountains

Kitamura

Homma

Takasu

et al. 2001

Plant Species Biology

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Populations of American beech in Virginia and the Great Smoky Mountain National Park in Tennessee and North Carolina were investigated for demographic genetic substructurings. Two Virginia populations, one on the Blue Ridge (WG1) and the other on the Piedmont (WG2) occur over an elevational gradient of several hundreds meters. One of the Great Smoky Mountain populations (GS1) was in a ‘beech gap’ and the other (GS2) in a ‘cove forest’ along a creek. The populations in the Great Smoky Mountain National Park were only separated by a few hundred meters in elevation, but both on the same physiographic province. The populations had two growth forms. Trees produced extensive root suckers at WG1, GS1 and GS2, but WG2 had no root suckers and all individuals had obviously been established from seeds. A total of 1335 shoots were mapped at the four sites, their size measured [diameter at breast height (DBH) or diameter at ground height (DGH)], and genotypes were determined for each locus using allozyme analysis. FIS among five different size‐classes revealed an excess of homozygotes in WG1, GS1 and GS2, and an excess of heterozygotes in WG2. The offshoot formation from root suckers obviously contributed to the abundance of intermediate size‐classes in WG1, GS1 and GS2. Exceedingly localized patchiness of different multilocus genotypes reveals genetic clustering of shoots that have obviously originated from root suckers in WG1, GS1 and GS2. The Piedmont population (WG2), on the other hand, showed loose localization of genetically related trees at a scale of 35–40 m in area, suggesting broader ranges of pollen and seed dispersal. The data are discussed in the light of the differences in growth form and mode of reproduction, and also in relation to the post‐glacial migration and the current geographic distribution of the species.

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Section: Discussionmentioning

confidence: 99%

Demographic genetics of the American beech, Fagus grandifolia. II. Genet substructure of populations for the Blue Ridge, Piedmont and the Great Smoky Mountains

Kitamura

Homma

Takasu

et al. 2001

Plant Species Biology

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“…Vegetatively reproduced shoots can maintain the genet over more than the life-span of a single shoot, to maintain particular adapted genotypes within the population for a longer period of time (Kitamura et al 1992(Kitamura et al , 1997aKawano & Kitamura 1997).…”

Section: Implications Of Root Suckers For the Spatio-temporal Geneticmentioning

confidence: 99%

Demographic genetic analyses of the American beech (Fagus grandifolia Ehrh.) I. Genetic substructurings of northern populations with root suckers in Quebec and Pennsylvania

Kitamura¹

2000

Plant Spec Biol

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Allozyme analyses were conducted to investigate the genetic substructurings of the American beech populations with root sucker formation. A total of 1364 shoots from four study plots in three local populations in its northern distributional range were thoroughly mapped, their sizes (diameter at breast height or diameter at ground height) measured and genotyped for 10 enzyme systems, and then multilocus genotypes were identified for each individual shoot. All four study plots turned out to be multiclonal populations in which the average number of shoots per multilocus genotype ranged from 1.17 to 3.22. Clonal diversities for the overall population were as high as 0.91-0.99 for Simpson's index (D) and 0.83-0.98 for Fager's index of evenness (E). Wright's F-statistics showed positive significant deviations from the Hardy-Weinberg Equilibrium in intermediate size-classes, a phenomenon which is attributed to overlapping generations with identical genotypes within these size-classes. Radial patterns of root sucker formation were intensive in three study plots, and size advantages in the production of root suckers were evident. Spatial autocorrelation analyses (standard normal deviates and coancestry) revealed that the effective range of root suckers in the American beech was 10-15 m. Seed production of the northern population of the American beech generates multiclonality, and the spatial genetic substructurings of local populations are subjected to extensive root sucker formation.

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“…2005). Few studies of fine‐scale genetic structure within plant populations go beyond autocorrelation analysis to visualize the spatial patterns of genetic variation (Kitamura et al . 1997a; Torres et al .…”

Section: Introductionmentioning

confidence: 99%

Detection and visualization of spatial genetic structure in continuous Eucalyptus globulus forest

2007

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Visualizing the pattern of variation using microsatellites within a Eucalyptus globulus forest on the island of Tasmania provided surprising insights into the complex nature of the fine-scale spatial genetic structure that resides in these forests. We used spatial autocorrelation and principal coordinate analysis to compare fine-scale genetic structure between juvenile and mature cohorts in a study area, 140 m in diameter, located within a typical, continuous E. globulus forest. In total, 115 juvenile and 168 mature individuals were genotyped with eight highly polymorphic microsatellite loci. There was no significant difference in the level of genetic diversity between cohorts. However, there were differences in the spatial distribution of the genetic variation. Autocorrelation analysis provided clear evidence for significant spatial genetic structure in the mature cohort and significant, but weaker, structure in the juvenile cohort. The spatial interpolation of principal coordinate axes, derived from ordination of the genetic distance matrix between individuals, revealed a spatially coherent family group which was evident in both cohorts. Direct comparison of the genetic structure within each cohort allowed visualization of a shift in the spatial distribution of genetic variation within the population of approximately 10 m. As the shift coincided with the direction of prevailing winds, it is hypothesized that this phenomenon is due to downwind dispersal of seeds and is indicative of the important role of prevailing winds in forcing eastward gene flow in these high-latitude forests.

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Demographic Genetics of the Japanese Beech, Fagus crenata, at Ogawa Forest Preserve, Ibaraki, Central Honshu, Japan. I. Spatial Genetic Substructuring in Local Populations

Cited by 27 publications

References 59 publications

Demographic genetics of the American beech, Fagus grandifolia. II. Genet substructure of populations for the Blue Ridge, Piedmont and the Great Smoky Mountains

Demographic genetics of the American beech, Fagus grandifolia. II. Genet substructure of populations for the Blue Ridge, Piedmont and the Great Smoky Mountains

Demographic genetic analyses of the American beech (Fagus grandifolia Ehrh.) I. Genetic substructurings of northern populations with root suckers in Quebec and Pennsylvania

Detection and visualization of spatial genetic structure in continuous Eucalyptus globulus forest

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