Allozymic variability in beechwoods (Fagus sylvatica L.) over central Europe: spatial differentiation among and within populations

Thiébaut, B.; Paule, Ladislav; Merzeau, Dominique; Letouzey, J

doi:10.1038/hdy.1990.111

Cited by 82 publications

(56 citation statements)

References 20 publications

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“…Found in almost all populations (Fig. 1), the excess of homozygotes estimated (average F18 = 0.117 (Table 3)) is similar to an equivalent estimate for Italian beech populations (average F18=0.125) by Comps et a!. (1990).…”

Section: Discussionsupporting

confidence: 53%

“…Comps et al (1990) found an FST value of 0.054 among European populations and a slightly higher one (0.058) for their Italian samples using a smaller number of loci. The high proportion of variability found in subdivisions below the population level, already reported in the literature (Knowles, 1984;Gregorius et al, 1986;Diebel & Feret, 1991) There was little evidence for selection, with no significant number of associations of allele frequencies with soil origin and altitude.…”

Section: Discussionmentioning

confidence: 99%

“…Comparison with data from the literature for the same species is made difficult by differences in the number of loci used and in the geographical scale considered. Comps et al (1990) report values between 25.7 per cent and 31.7 per cent (average 30.8 per cent) but on larger geographical subdivisions (whole countries) using only six loci.…”

Section: Discussionmentioning

confidence: 99%

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Genetic variability of Fagus sylvatica L. in Italy: the role of postglacial recolonization

Leonardi

Menozzi

1995

Heredity

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Genetic variability of 21 Italian populations of beech (Fagus sylvatica L.) was studied using starch gel electrophoresis and nine polymorphic enzyme gene loci. Expected mean heterozygosity varied from 13.6 per cent to 20.3 per cent. Observed heterozygosity was less than expected in all but two populations. No association between allele frequencies and soil type or altitude was found. As in other forest tree species, the among-populations component of variability was low (average FST = 0.046). Despite low genetic differentiation, principal components analysis of allelic frequencies revealed a geographical pattern. The first principal component, significantly correlated with latitude and longitude, showed a clear separation of southern and northern populations. The statistical significance of the geographical pattern was tested by a resampling technique (bootstrap). The origin of Italian beech populations from eastern and southern refugia during the last glaciation is discussed. First principal component values and the higher allele variability found in southern populations seem to concord with the palynological evidence for a southern origin of beech in the peninsular part of Italy.

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Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 99%

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Genetic variability of Fagus sylvatica L. in Italy: the role of postglacial recolonization

Leonardi

Menozzi

1995

Heredity

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“…other deciduous species of the same family (Fagaceae), as in Fagus sylvatica (Gregorius et al, 1986;Comps et a!., 1990), a deficit in heterozygotes is also found, although smaller than the one observed here in sessile oak. A number of hypotheses have been proposed to explain heterozygote deficiency (Brown, 1979).…”

Section: Discussionmentioning

confidence: 67%

Intraspecific genetic structure in a mixed population of Quercus petraea (Matt.) Leibl and Q. robur L.

1994

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The intraspecific genetic structure of a mixed population of sessile and pedunculate oak was studied in the Petite Charnie Forest, Sarthe, France, using enzyme electrophoresis. Spatial structure was analysed by calculating F-statistics and autocorrelations at different scales of spatial subdivision of the population. F-statistics were also used to compare the genetic structure of groups of trees subdivided according to the phenology of flowering. Spatial organization of phenology of flowering was studied with autocorrelation methods. In both species, a highly significant heterozygote deficiency was found at the population level. Spatial genetic structure was at least partially responsible for this deficiency, as demonstrated by the variations observed in F-statistics in relation to the size of this population subdivision. The significance of the observed structure was confirmed by comparison with a null hypothesis generated with the help of permutation analysis. We suggest that the limited dispersal of pollen and/or seeds in the stand gave rise to a family structure. The autocorrelation in phenology of flowering found in both species could contribute to lower the neighbourhood size and then to increase the Wahlund effect. Autocorrelation analyses allowed us to show that heterogeneity of patterns of structure among loci was present. Other possible causes of the genetic structure and its heterogeneity are discussed.

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“…European beech (Fagus sylvatica L.) is no exception to this general pattern (Comps et al, 1990;Müller-Starck et al, 1992). In a survey of 21 Italian populations of beech we confirmed this partitioning of genetic variability and also found that a substantial part of the variation is attributable to the withinsubpopulation component (Leonardi & Menozzi, 1995).…”

Section: Introductionmentioning

confidence: 99%

Spatial structure of genetic variability in natural stands of Fagus sylvatica L. (beech) in Italy

Leonardi

Menozzi

1996

Heredity

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We report an autocorrelation study of 11 enzyme loci detected by starch gel electrophoresis in 14 populations over the Italian biogeographical range of beech (Fagus sylvatica L.). In line with previous studies of beech and other forest tree species a low level of spatial autocorrelation was detected. No correlation between the amount of microspatial structuring of genetic variability in different populations and environmental (latitude, longitude, altitude), structural (mean and standard deviation of tree size) and genetic characteristics (mean expected heterozygosity, mean F1) was found. No significant differences in the amount of spatial structuring seem to exist among loci if low heterozygosity loci are excluded from the analysis.

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Allozymic variability in beechwoods (Fagus sylvatica L.) over central Europe: spatial differentiation among and within populations

Cited by 82 publications

References 20 publications

Genetic variability of Fagus sylvatica L. in Italy: the role of postglacial recolonization

Genetic variability of Fagus sylvatica L. in Italy: the role of postglacial recolonization

Intraspecific genetic structure in a mixed population of Quercus petraea (Matt.) Leibl and Q. robur L.

Spatial structure of genetic variability in natural stands of Fagus sylvatica L. (beech) in Italy

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