Increased inbreeding and strong kinship structure in Taxus baccata estimated from both AFLP and SSR data

Chybicki, Igor J.; Oleksa, Andrzej; Burczyk, Jarosław

doi:10.1038/hdy.2011.51

Cited by 85 publications

(92 citation statements)

References 59 publications

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“…As shown in our earlier study, both populations reveal a significant SGS at six nuclear microsatellite markers (Chybicki et al, 2011) as well as relatively high genetic variation and no signal of a recent bottleneck (Chybicki et al, 2012). In addition, Cisy Staropolskie showed low (that is, F = 0.04), but statistically significant inbreeding (Chybicki et al, 2011).…”

Section: Natural Populationsmentioning

confidence: 94%

“…For the purpose of comparative assessment of spatial genetic structure, we used data on six microsatellite markers assayed previously for the two natural populations. Details are described in Chybicki et al (2011).…”

Section: Natural Populationsmentioning

confidence: 99%

“…To study SGS intensity in the mitochondrial vs nuclear genome, we used samples collected within two remnant populations of T. baccata well characterised for genetic structure in our previous studies (Chybicki et al, 2011(Chybicki et al, , 2012. Within each population, sex proportions were estimated based on direct observations of reproductive organs or remains of seed envelopes attached to branches.…”

Section: Natural Populationsmentioning

confidence: 99%

“…For this purpose, the total genomic DNA was extracted from needles taken from progeny and parents using the CTAB protocol (Doyle and Doyle, 1990). In the case of samples from natural populations, we used DNA extracted previously (see Chybicki et al, 2011) and stored at − 80°C.…”

Section: Natural Populationsmentioning

confidence: 99%

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Relative strength of fine-scale spatial genetic structure in paternally vs biparentally inherited DNA in a dioecious plant depends on both sex proportions and pollen-to-seed dispersal ratio

et al. 2016

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In plants, the spatial genetic structure (SGS) is shaped mainly by gene dispersal and effective population density. Among additional factors, the mode of DNA inheritance and dioecy influence SGS. However, their joint impact on SGS remains unclear, especially in the case of paternally inherited DNA. Using theoretical approximations and computer simulations, here we showed that the relative intensity of SGS measured in paternally and biparentally inherited DNA in a dioecious plant population depends on both the proportion of males and the pollen-to-seed dispersal ratio. As long as males do not prevail in a population, SGS is more intense in paternally than biparentally inherited DNA. When males prevail, the intensity of SGS in paternally vs biparentally inherited DNA depends on the compound effect of sex proportions and the pollen-to-seed dispersal ratio. To empirically validate our predictions, we used the case of Taxus baccata, a dioecious European tree. First, we showed that mitochondrial DNA (mtDNA) in T. baccata is predominantly (98%) paternally inherited. Subsequently, using nuclear DNA (nuDNA) and mitochondrial microsatellite data, we compared the fine-scale SGS intensity at both marker types in two natural populations. The population with equal sex proportions showed stronger SGS in mtDNA than in nuDNA. On the other hand, we found lower SGS intensity in mtDNA than in nuDNA in the population with 67% males. Thus, the empirical results provided good support for the theoretical predictions, suggesting that knowledge about SGS in paternally vs biparentally inherited DNA may provide insight into effective sex proportions within dioecious populations.

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Section: Natural Populationsmentioning

confidence: 94%

Section: Natural Populationsmentioning

confidence: 99%

Section: Natural Populationsmentioning

confidence: 99%

Section: Natural Populationsmentioning

confidence: 99%

See 2 more Smart Citations

Relative strength of fine-scale spatial genetic structure in paternally vs biparentally inherited DNA in a dioecious plant depends on both sex proportions and pollen-to-seed dispersal ratio

et al. 2016

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“…when F IS is fixed at 0) using the Bayesian procedure based on the Deviance Information Criterion (DIC; cf. Chybicki et al 2011).…”

Section: Genetic Variation and Inbreedingmentioning

confidence: 99%

Population at the edge: increased divergence but not inbreeding towards northern range limit in Acer campestre

Chybicki

Waldon‐Rudzionek

Meyza

2014

Tree Genetics & Genomes

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Ecological conditions shape natural distribution of plants. Populations are denser in optimal habitats but become more fragmented in the areas of suboptimal environmental conditions. Usually, fragmentation increases towards the limits of species distribution. Fragmented populations are often characterised by decreased genetic variation, and this effect is frequent in peripheral populations, mostly due to the reduced effective population size. Interestingly, the genetic consequences of fragmentation seem to be relatively weak in forest trees. Using microsatellite markers, we assessed the impact of population fragmentation on the genetic structure of a European tree species Acer campestre. Within the study area, this medium-size wind-dispersed and insect-pollinated tree reveals a gradual decrease in population density towards the northern range limit. Over the distance of 150 km, we detected the significant decrease in allelic richness, heterozygosity as well as an increase in the rate of population divergence along with latitude. On the other hand, we failed to show that the observed patterns of genetic structure result from the variation in population densities. Moreover, inbreeding levels revealed no association with both density and geographic location, suggesting that pollen limitation does not occur, even at the range margin. As we showed that there is no difference in a dispersal scale between low-and highdensity populations in the study species, we argue that the genetic structure is a result of postglacial recolonization. However, unlike many other forest trees, A. campestre showed the sharp latitudinal genetic pattern at a very restricted spatial scale. Limited dispersal and high fragmentation are likely the reasons.

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Hatchery release programme modified the genetic diversity and population structure of wild Chinese sucker (Myxocyprinus asiaticus) in the upper Yangtze River

Song

2021

Aquatic Conservation

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The Chinese sucker (Myxocyprinus asiaticus) is an endangered and threatened fish species in China. To augment wild populations, millions of captive‐bred Chinese sucker have been released into the upper Yangtze River in recent years, with little evaluation of the genetic impact. The genetic diversity of 112 wild M. asiaticus from different reaches of the Yangtze River was examined, and the population structure among them and three artificially bred populations was determined using 12 microsatellite markers. Genetic data from the wild M. asiaticus populations before the hatchery release programme were synthesized and compared to detect fine‐scale variation in genetic structure together with spatiotemporal changes in the wild population. The results showed that the genetic diversity of wild M. asiaticus was relatively high (observed heterozygosity = 0.604–0.609, polymorphic information content = 0.442–0.496), even though a moderate decrease in total diversity was detected when compared with previous studies. M. asiaticus from the Wanzhou reaches, which showed low genetic variation before the stocking programmes, displayed the highest level of genetic diversity (observed heterozygosity = 0.609, polymorphic information content = 0.496) in this study. Insignificant differences in genetic structure among wild populations, with low genetic differentiation (Fst = 0.035–0.083), as well as close genetic relationships between wild and hatchery populations were observed. Current genetic diversity and population structure of wild M. asiaticus were strikingly different from those before the hatchery release programme, which indicated that stocking activities have altered the genetic character of the populations in the upper Yangtze River. The conservation of M. asiaticus requires legal protection for the fish and its habitat. Genetic monitoring of the wild populations and accurate evaluation of genetic divergence is imperative. In addition, the results of this study should be used to provide scientific guidance for an effective hatchery release programme for M. asiaticus.

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Increased inbreeding and strong kinship structure in Taxus baccata estimated from both AFLP and SSR data

Cited by 85 publications

References 59 publications

Relative strength of fine-scale spatial genetic structure in paternally vs biparentally inherited DNA in a dioecious plant depends on both sex proportions and pollen-to-seed dispersal ratio

Relative strength of fine-scale spatial genetic structure in paternally vs biparentally inherited DNA in a dioecious plant depends on both sex proportions and pollen-to-seed dispersal ratio

Population at the edge: increased divergence but not inbreeding towards northern range limit in Acer campestre

Hatchery release programme modified the genetic diversity and population structure of wild Chinese sucker (Myxocyprinus asiaticus) in the upper Yangtze River

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