Seeing the forest through the trees: comprehensive inference on individual mating patterns in a mixed stand of Quercus robur and Q. petraea

Chybicki, Igor J.; Burczyk, Jarosław

doi:10.1093/aob/mct131

Cited by 35 publications

(64 citation statements)

References 79 publications

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“…Dioecious plant species analyzed by the authors had on average 6-fold higher SGS than monoecious species. According to theoretical considerations and empirical studies, seed dispersal range has a predominant impact on building SGS in natural populations (Vekemans and Hardy 2004;Heuertz et al 2003;Chybicki and Burczyk 2013). In dioecious species, the number of seed sources is half in compared to monoecious species.…”

Section: Communicated By P Ingvarssonmentioning

confidence: 99%

Sex-specific pattern of spatial genetic structure in dioecious and clonal tree species, Populus alba L.

Dering

Rączka

Szmyt

2016

Tree Genetics & Genomes

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Fine-scale spatial genetic structure (SGS) has profound ecological and genetic consequences for plant populations, and some studies indicate that clonal reproduction may significantly enhance SGS. Clonality is widespread among dioecious species, but little is known about the relationship between clonal reproduction and SGS in the frame of sexual dimorphism. We asked the following questions: (1) Is there a sexually dependent pattern of SGS in white poplar population? (2) What is the relationship between clonal reproduction and SGS? and (3) Does this relationship have a sex-specific component? Using 16 microsatellite markers, genetic structure including fine-scale SGS and clonality of females and males of white poplar were investigated. Significant SGS was noted for both sexes at the ramet and genet levels. At the genet level, males had 2.7-fold higher SGS than that of females. Clonality significantly contributed to SGS only in females. A sibship structure revealed with pedigree analysis and clustering-based methods among males was likely the major factor of the observed SGS. The sexes differed in their clonal growth strategies. Spatial positioning of ramets in female clones suggested foraging behavior and/or avoidance of competition, while for male clones it indicated more expansion and space colonization. The obtained results led us to conclude that sexual dimorphism in life history traits may affect the course and rate of demo-genetic processes acting in natural populations of dioecious species. To our knowledge, this is the first study demonstrating a sex-specific pattern of SGS in natural populations of dioecious species.

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Section: Communicated By P Ingvarssonmentioning

confidence: 99%

Sex-specific pattern of spatial genetic structure in dioecious and clonal tree species, Populus alba L.

Dering

Rączka

Szmyt

2016

Tree Genetics & Genomes

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“…To estimate the regression parameters, we adopted the Bayesian approach developed recently as a framework to model plant mating systems (Chybicki 2013;Chybicki and Burczyk 2013). The approach is generally based on the (mixed mating) probability model, similar to that used in MLTR, in which the probability of the multilocus genotype O ij of the j−th offspring in the i−th maternal family is as follows:…”

Section: Analysis Of Outcrossing Ratesmentioning

confidence: 99%

“…The elements X ij in X equaled 1 or 0 if the j−th seed in the i−th family was produced through outcrossing or selfing, respectively. The auxiliary variables are normally unknown, but they can be inferred from data given t and P, using a Bernoulli scheme described in detail in Chybicki (2013) and Chybicki and Burczyk (2013). Here, we only stress that, in a consequence of the algorithm, P was estimated simultaneously with the remaining parameters (as in MLTR software).…”

Section: Analysis Of Outcrossing Ratesmentioning

confidence: 99%

Bayesian approach reveals confounding effects of population size and seasonality on outcrossing rates in a fragmented subalpine conifer

Chybicki

Dzialuk

2014

Tree Genetics & Genomes

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Mating systems have long been recognized as key factors determining genetic structure within and between populations. Outcrossing promotes genetic diversity and gene flow between populations, while inbreeding, on the other hand, decreases recombination rates, facilitating fixation of co-adapted genes. In small populations, selfing moderates pollen limitation because of low mate availability, but at the cost of increased inbreeding depression. These conflicts are of more than theoretical interest; they are critical for the management of endangered species. In order to help designing conservation strategies for the management of the gene pool of fragmented populations of Pinus cembra, a protected species in Poland, we have characterized pollen flow and mating structure using nuclear microsatellite markers. We demonstrated that P. cembra in the studied stands of the Tatra Mts. is characterized by an average outcrossing rate (t) of 0.72. Unlike with the existing approaches, using the newly developed Bayesian method, we found that population size and seasonal variation had confounding effects on outcrossing rates. In concordance with predictions, large populations showed significantly higher outcrossing rates (t=0.89) than smaller ones (t=0.51). Temporal variation revealed in the outcrossing rate might be linked with masting behavior of the species. On the other hand, we showed that outcrossing rates were not associated with a trunk diameter of a mother tree. Our study also demonstrated that biparental inbreeding is a significant component of mating system. However, we further show that pollen dispersal follows a fat-tailed distribution (with the average dispersal distance of 1,267 m) so that at least some long-distance pollen dispersal must be occurring.Overall, we conclude that the high inbreeding (both selfing and mating between relatives) found in P. cembra buffers for pollen limitation. We argue that small, isolated stands can be at risk of gene pool erosion, despite the potential for longdistance pollen and seed dispersal.

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“…Because most segregating molecular variants used in population genetics are selectively neutral (e.g., [23], pp. [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47], population genetic diversity and differentiation for neutral markers are not prone to be modified by selection compared to adaptive genes (e.g., [24]). Genome-wide diversity and differentiation, nevertheless, may be affected in case of selection against inbred genotypes in a population which declines in size.…”

Section: The Foundation: Basics Of Population Geneticsmentioning

confidence: 99%

“…In recent years, paternity studies proliferated and underlying methods have been refined ( [30,39,40]). For instance, the initial approach of Burczyk et al [33] (the neighbourhood model) has been extended to allow the estimation of both pollen and seed dispersal, as well as individual mating patterns and thus fecundities [41]. Apart from the mere estimation of dispersal distances, these new methods allow quantifying the variation of dispersal kernels of individuals and populations, and determining the most important ecological factors contributing to this variation.…”

Section: Gene Flowmentioning

confidence: 99%

Potential Population Genetic Consequences of Habitat Fragmentation in Central European Forest Trees and Associated Understorey Species—An Introductory Survey

Dobeš¹,

Konrad²,

Geburek³

2017

Diversity

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Abstract:Habitat fragmentation threatens the maintenance of genetic diversity of affected populations. Assessment of the risks associated with habitat fragmentation is a big challenge as the change in population genetic diversity is a dynamic process, often acting over long time periods and depending on various characteristics pertaining to both species (life history traits) and their populations (extrinsic characteristics). With this survey, we provide an introductory overview for persons who have to make or are interested in making predictions about the fate of forest-dwelling plant populations which have recently become fragmented and isolated from their main occurrences. We provide a concise introduction to the field of population genetics focusing on terms, processes and phenomena relevant to the maintenance of genetic diversity and vitality of plant populations. In particular the antagonistic effects of gene flow and random genetic drift are covered. A special chapter is devoted to Central European tree species (including the Carpathians) which we treat in detail with reference to an extensive literature survey on population genetic studies assembled from the whole of Europe. We further provide an overview of the population biology of associated understorey species. We conclude with recommended steps to be taken for the evaluation of potential perils of habitat fragmentation or population thinning for the genetics of tree populations. The complexity of effects exerted by life history traits and extrinsic characteristics of populations suggest population genetic development is strongly situation dependent. Therefore, we recommend following a case-by-case approach ideally supported by computer simulations to predict future population genetic development of both trees and associated understorey species.

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Seeing the forest through the trees: comprehensive inference on individual mating patterns in a mixed stand of Quercus robur and Q. petraea

Cited by 35 publications

References 79 publications

Sex-specific pattern of spatial genetic structure in dioecious and clonal tree species, Populus alba L.

Sex-specific pattern of spatial genetic structure in dioecious and clonal tree species, Populus alba L.

Bayesian approach reveals confounding effects of population size and seasonality on outcrossing rates in a fragmented subalpine conifer

Potential Population Genetic Consequences of Habitat Fragmentation in Central European Forest Trees and Associated Understorey Species—An Introductory Survey

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