Spatial Genetic Structure in Two Tamarack [Larix laricina (Du ROI) K. Koch] Populations with Differing Establishment Histories

Knowles, Peggy; Perry, Daniel J.; Foster, Heather A.

doi:10.2307/2409875

Cited by 40 publications

(44 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The discrepancies among studies may be because of factors such as percentage of tree removal (final forest density), level of gene inflow from the surrounding forest and level of genetic relatedness between the trees left after harvesting. Spatial analyses have shown some level of clustering of genotypes within populations of other conifers (Knowles et al, 1992;Cavers et al, 2005). However, cluster sizes are quite small (5-50 m across), suggesting that they are primarily a result of limited seed dispersal, and that the clusters are made up of close relatives; Knowles et al (1992) compared spatial genetic clustering in two stands of Larix laricina.…”

Section: Discussionmentioning

confidence: 98%

“…Spatial analyses have shown some level of clustering of genotypes within populations of other conifers (Knowles et al, 1992;Cavers et al, 2005). However, cluster sizes are quite small (5-50 m across), suggesting that they are primarily a result of limited seed dispersal, and that the clusters are made up of close relatives; Knowles et al (1992) compared spatial genetic clustering in two stands of Larix laricina. The stand had naturally regenerated after clear-cutting, presumably by a few remnant individuals scattered within the stand, and showed significant spatial clustering of genotypes.…”

Section: Discussionmentioning

confidence: 98%

See 1 more Smart Citation

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

et al. 2009

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 98%

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

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Lastly, Boyle et a!. (1990), Xie & Knowles (1991), Knowles et al (1992) and Geburek (1993) found differences in spatial structure between stands of the same species, some of which could be interpreted as the result of different colonization histories.…”

Section: Introductionmentioning

confidence: 93%

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

Doligez

Joly

1997

Heredity

View full text Add to dashboard Cite

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.

show abstract

“…Strong structuring has also been detected using spatial autocorrelation in a population in which vegetative reproduction and limited dispersal of pollen and seeds were observed (Shapcott, 1995). It has also revealed striking differences in genetic structure between populations with differing histories of anthropogenic disturbance (Knowles et al, 1992;Takahashi et al, 2000).…”

Section: Introductionmentioning

confidence: 81%

Ecological and genetic effects of cutting in an Alnus trabeculosa Hand.-Mazz. (Betulaceae) population

Miyamoto¹,

Karamoto²,

Takahashi³

2003

Heredity

View full text Add to dashboard Cite

In order to assess the ecological and genetic effects of cutting, we compared two portions of Alnus trabeculosa population at Yuda (Iwate Prefecture, Japan): one that has been cut about 30 years ago and one that has remained uncut. These portions were compared in terms of the degree of sprouting, genetic variation and gene distribution using isozyme markers. First, we determined the multilocus genotype (MLG) of all ramets, then sorted them into individuals according to the distribution of the MLGs. The average (7SE) of largest distance between ramets in one individual was 2.1 (70.18) m, which is consistent with the distance (2.0 (70.20) m) obtained by tracing physical connections between ramets. We found no significant differences in genetic variation between the two portions, but there were significant differences in their degree of sprouting. Furthermore, there were striking differences in gene distribution: the cut portion showed greater clustering of individuals with identical genetic components, which may be due to regeneration in the gaps made by cutting, reflecting the location of the mother trees, and seed and pollen dispersal from them.

show abstract

Spatial Genetic Structure in Two Tamarack [Larix laricina (Du ROI) K. Koch] Populations with Differing Establishment Histories

Cited by 40 publications

References 11 publications

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

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

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

Ecological and genetic effects of cutting in an Alnus trabeculosa Hand.-Mazz. (Betulaceae) population

Contact Info

Product

Resources

About