Spatial autocorrelation of allozyme traits in a Norway spruce (<i>Picea</i><i>abies</i>) population

Leonardi, Stefano; Raddi, Sabrina; Borghetti, Marco

doi:10.1139/x26-007

Cited by 48 publications

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“…In two French populations only five out of 35 and two out of 20 significant SNDs were found. Similar patterns have been found for the coniferous species Pinus contorta (Epperson & Allard, 1989), Picea mariana (Knowles, 1991), Picea abies (Leonardi et a!., 1996) and for the broadleaved species Acer saccharum (Perry & Knowles, 1991;Young & Merriam, 1994), Quercuspetraea and Q. robur (Bacilieri et al, 1994). In this study most genotypes were apparently randomly located within the population.…”

Section: Discussionsupporting

confidence: 85%

“…Similar results were obtained in other forest tree species: Picea mariana (Knowles, 1991), Acer saccharum (Perry & Knowles, 1991), Quercus petraea and Q. robur (Bacilieri ci' a!., 1994). Studies with intensive sampling of relatively limited areas also revealed scarce spatial structuring in lodgepole pine (Epperson & Allard, 1989), Picea abies (Leonardi et al, 1996) and Turkey oak (Berg & Hamrick, 1995).…”

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confidence: 99%

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

Leonardi

Menozzi

1996

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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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Section: Discussionsupporting

confidence: 85%

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confidence: 99%

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

Leonardi

Menozzi

1996

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“…Other work reported nearly random spatial structure, consistent with long-distance seed and pollen dispersal, except for a few loci that could be influenced by selection in some cases (Epperson & Allard, 1989;Knowles, 1991;Geburek & Tripp-Knowles, 1994;Leonardi et a!., 1996). Lastly, Boyle et a!.…”

Section: Introductionmentioning

confidence: 65%

Genetic diversity and spatial structure within a natural stand of a tropical forest tree species, Carapa procera (Meliaceae), in French Guiana

Doligez

Joly

1997

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Isozyme markers were used to characterize levels of diversity, genotypic structure and spatial genetic structure for the low-density tree species, Carapa procera (five adults per ha), within 300 ha of a continuous tropical rain forest stand. Both seed and adult stages were investigated, a high level of genetic diversity being found in both. Fixation indices showed excess homozygosity in seeds, and excess heterozygosity in adults, which might be caused by selection in favour of heterozygotes. Autocorrelation analysis of the spatial distribution of genotypes revealed no significant pattern in adults or in seeds before dispersal, and there was a high variability in correlogram shapes among alleles. This suggests that gene flow is extensive in C. procera, probably mainly through long-distance pollen dispersal, as seed dispersal is expected to be rather limited in this species (maximum distances of about 50 m). No clear-cut spatial pattern was observed in pollen allele frequencies, which supports the hypothesis of extensive pollen flow. This overall lack of structure is consistent with the data already available on the mating system of this predominantly outcrossing species.

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“…Our results are also similar to those obtained in earlier studies on P. abies. Leonardi et al (1996) found a weak spatial structure in a naturally regenerated uneven aged alpine stand, evidence of high gene flow. Scotti et al (2008) in a mixed alpine stand found high gene flow via pollen and more spatially limited seed dispersal.…”

Section: Discussionmentioning

confidence: 93%

Spruce colonization at treeline: where do those seeds come from?

et al. 2009

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At treeline, selection by harsh environmental conditions sets an upward limit to arboreal vegetation. Increasing temperatures and the decline of traditional animal raising have favoured an upward shift of treeline in the last decades. These circumstances create a unique opportunity to study the balance of the main forces (selection and gene flow) that drive tree migration. We conducted a parentage analysis sampling and genotyping with five microsatellite markers in all Norway spruce individuals (342 juveniles and 23 adults) found in a recently colonized treeline area (Paneveggio forest, Eastern Alps, Italy). Our goal was to evaluate local reproductive success versus gene flow from the outside. We were able to identify both parents among local adults for only 11.1% of the juveniles. In the gamete pool we sampled, two-thirds were not produced locally. Effective seed dispersal distance distribution was characterized by a peak far from the seed source (mean 344.66 m ± 191.02 s.d.). Reproductive success was skewed, with six local adults that generated almost two-thirds (62.4%) of juveniles with local parents. Our findings indicate that, although a few local adults seem to play an important role in the colonization process at treeline, large levels of gene flow from outside were maintained, suggesting that the potential advantages of local adults (such as local adaptation, proximity to the colonization area, phenological synchrony) did not prevent a large gamete immigration.

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Spatial autocorrelation of allozyme traits in a Norway spruce (Piceaabies) population

Cited by 48 publications

References 0 publications

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

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

Genetic diversity and spatial structure within a natural stand of a tropical forest tree species, Carapa procera (Meliaceae), in French Guiana

Spruce colonization at treeline: where do those seeds come from?

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