Gene flow pattern and mating system in a small population of Quercus semiserrata Roxb. (Fagaceae)

Pakkad, Greuk; Ueno, S.; Yoshimaru, Hiroshi

doi:10.1016/j.foreco.2008.03.017

Cited by 28 publications

(23 citation statements)

References 63 publications

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“…This leptokurtic pattern resembles the ones reported for different wind-pollinated tree species (Dow and Ashley, 1998;Streiff et al, 1999;Robledo-Arnuncio and Gil, 2005;Pakkad et al, 2008;Pluess et al, 2009). Considering the small size and geometry (with a densest main core) of the studied population, the observed mean dispersal distance (71 m) indicates that effective pollen moves across the whole population area, consistently with the contribution of most sampled males to the seed crop.…”

Section: Discussionsupporting

confidence: 83%

“…Compared with other wind-pollinated species, the estimated pollen immigration rate lies below values found in continuous or weakly fragmented populations (Dow and Ashley, 1998;Streiff et al, 1999), and above estimates reported for more strongly isolated populations (Robledo-Arnuncio and Gil, 2005). This significant quantity of immigrant pollen, to the extent that it were translated into effective gene flow among established seedlings, could greatly contribute to population genetic diversity, avoiding the drift-induced erosion of genetic variability expected for such a small local population size (Hamrick, 2004;Bittencourt and Sebbenn, 2007;Pakkad et al, 2008). Gene flow among palm groves would tend at the same time to homogenize neutral genetic variation over greater scales, at least among fragments within islands.…”

Section: Discussionmentioning

confidence: 68%

“…Flowering asynchronies among sexes within populations, on the other hand, might increase the proportion of gene immigration from other groves, if local females become receptive when no local pollen is available. Further investigation on flowering phenology overlap among populations, sufficiently replicated to capture the expected variation across years (Pakkad et al, 2008), could help better understand the potential for long-distance effective pollen flow and its temporal variation in P. canariensis.…”

Section: Discussionmentioning

confidence: 99%

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Patterns of pollen dispersal in a small population of the Canarian endemic palm (Phoenix canariensis)

et al. 2014

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The genetic diversity of small populations is greatly influenced by local dispersal patterns and genetic connectivity among populations, with pollen dispersal being the major component of gene flow in many plants species. Patterns of pollen dispersal, mating system parameters and spatial genetic structure were investigated in a small isolated population of the emblematic palm Phoenix canariensis in Gran Canaria island (Canary Islands). All adult palms present in the study population (n ¼ 182), as well as 616 seeds collected from 22 female palms, were mapped and genotyped at 8 microsatellite loci. Mating system analysis revealed an average of 5.8 effective pollen donors (N ep ) per female. There was strong variation in correlated paternity rates across maternal progenies (ranging from null to 0.9) that could not be explained by the location and density of local males around focal females. Paternity analysis revealed a mean effective pollen dispersal distance of B71 m, with B70% of effective pollen originating from a distance of o75 m, and 90% from o200 m. A spatially explicit mating model indicated a leptokurtic pollen dispersal kernel, significant pollen immigration (12%) from external palm groves and a directional pollen dispersal pattern that seems consistent with local altitudinal air movement. No evidence of inbreeding or genetic diversity erosion was found, but spatial genetic structure was detected in the small palm population. Overall, the results suggest substantial pollen dispersal over the studied population, genetic connectivity among different palm groves and some resilience to neutral genetic erosion and subsequently to fragmentation.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 99%

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Patterns of pollen dispersal in a small population of the Canarian endemic palm (Phoenix canariensis)

et al. 2014

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“…When values lower than 0.5 were found, they were associated with particular ecological conditions. In Quercus semiserrata low pollen immigration was ascribed to high isolation from conspecific populations owing to habitat fragmentation (Pakkad et al, 2008). Similar findings were reported by Pluess et al (2009) and Hanaoka et al (2007) in highly disturbed populations of Quercus lobata and Fagus crenata, respectively.…”

Section: Discussionsupporting

confidence: 78%

Comparison of pollen gene flow among four European beech (Fagus sylvatica L.) populations characterized by different management regimes

et al. 2011

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The study of the dispersal capability of a species can provide essential information for the management and conservation of its genetic variability. Comparison of gene flow rates among populations characterized by different management and evolutionary histories allows one to decipher the role of factors such as isolation and tree density on gene movements. We used two paternity analysis approaches and different strategies to handle the possible presence of genotyping errors to obtain robust estimates of pollen flow in four European beech (Fagus sylvatica L.) populations from Austria and France. In each country one of the two plots is located in an unmanaged forest; the other plots are managed with a shelterwood system and inside a colonization area (in Austria and France, respectively). The two paternity analysis approaches provided almost identical estimates of gene flow. In general, we found high pollen immigration (B75% of pollen from outside), with the exception of the plot from a highly isolated forest remnant (B50%). In the two unmanaged plots, the average within-population pollen dispersal distances (from 80 to 184 m) were higher than previously estimated for beech. From the comparison between the Austrian managed and unmanaged plots, that are only 500 m apart, we found no evidence that either gene flow or reproductive success distributions were significantly altered by forest management. The investigated phenotypic traits (crown area, height, diameter and flowering phenology) were not significantly related with male reproductive success. Shelterwood seems to have an effect on the distribution of within-population pollen dispersal distances. In the managed plot, pollen dispersal distances were shorter, possibly because adult tree density is three-fold (163 versus 57 trees per hectare) with respect to the unmanaged one.

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“…Paternity analysis was carried out in CERVUS using log-likelihood ratios (LOD score) for the paternity assignment on the basis of observed multilocus genotypes at a strict (95%) and relaxed (80%) confidence level. Simulations of paternity analysis were completed to determine confidence levels of LOD scores (Pakkad et al 2008, Pluess et al 2009). The parameters for the simulation analyses were: number of cycles: 100,000; number of candidate parents: 200; proportion of candidate fathers sampled: 25%; proportion of loci typed: 99%; loci mistyped: 1%; error rate in likelihood calculations: 0.010 and the minimum number of typed loci: 4.…”

Section: Discussionmentioning

confidence: 99%

Nuclear microsatellite markers for population genetic studies in sugar maple (Acer saccharum Marsh.)

et al. 2015

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Abstract. A set of seven new nuclear microsatellite markers (nSSRs) was developed for sugar maple (Acer saccharum Marsh.) using paired-end Illumina sequencing. Out of 96 primers screened in a panel of six unrelated individuals, seven markers amplified polymorphic products. The utility of these markers, in addition to six already published microsatellites, for genetic variation and gene flow studies was assessed. Out of the seven newly developed markers, three amplified multiple fragments and were interpreted as dominant (absence/presence) markers, while four markers amplified a maximum of two amplification products per sample. The six published microsatellites and three of the four newly developed markers showed regular segregation in an open-pollinated single tree progeny. Observed heterozygosity (H o ) and expected heterozygosity (H e ) in 48 individuals from one population ranged from 0.436 to 0.917 and from 0.726 to 0.894, respectively. Dominant markers revealed 64 variable positions and moderate genetic variation within the population (H e = 0.102, Shannon's I = 0.193). Paternity analyses in the program CERVUS at co-dominant markers showed effective dispersal of pollen in the sugar maple population both at 95% and 80% confidence levels. Dependent on the confidence level, the mean pollen dispersal distance within the population ranged from 33.25 m to 38.75 m and gene flow from outside the stand from 78% to 82%. The absence of fine-scale Spatial Genetic Structure (SGS) suggested effective dispersal of both seeds and pollen.

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Gene flow pattern and mating system in a small population of Quercus semiserrata Roxb. (Fagaceae)

Cited by 28 publications

References 63 publications

Patterns of pollen dispersal in a small population of the Canarian endemic palm (Phoenix canariensis)

Patterns of pollen dispersal in a small population of the Canarian endemic palm (Phoenix canariensis)

Comparison of pollen gene flow among four European beech (Fagus sylvatica L.) populations characterized by different management regimes

Nuclear microsatellite markers for population genetic studies in sugar maple (Acer saccharum Marsh.)

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