Fine-Scale Spatial Genetic Structure with Nonuniform Distribution of Individuals

Doligez, Agnès; Baril, Claire; Joly, Hélène

doi:10.1093/genetics/148.2.905

Cited by 90 publications

(9 citation statements)

References 28 publications

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“…As originally pointed out by Felsenstein (1975Felsenstein ( , 1979, and more recently by Epperson et al (1999), there is still no accepted theory for the decay function of the probability of IBD with distance within a continuous population ; only simulation results are available (Rohlf & Schnell, 1971 ;Doligez et al, 1998 ;Epperson et al, 1999). We were forced to make an arbitrary choice of decay functions, and it is reassuring that a change in that function makes little difference, although the need for proper (closed form) theory remains.…”

Section: Discussionmentioning

confidence: 99%

Two-generation analysis of pollen flow across a landscape. III. Impact of adult population structure

2001

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The rate and distance of instantaneous pollen flow in a population are parameters of considerable current interest for plant population geneticists and conservation biologists. We have recently developed an estimator (Φft) of differentiation between the inferred pollen clouds that fertilize several females, sampled within a single population. We have shown that there is a simple relation between Φft and the average pollen dispersal distance (δ) for the case of a population with no geographic structure. Though forest trees usually show considerable pollen flow, assuming an absence of spatially distributed genetic structure is not always wise. Here, we develop analytical theory for the relation between Φft and δ, for the case where the probability of Identity by Descent (IBD) for two individuals decreases with the physical distance between them. This analytical theory allows us to provide an effective method for estimating pollen dispersal distance in a population with adult genetic structure. Using real examples, we show that estimation errors can be large if genetic structure is not taken into account, so it is wise to evaluate adult genetic structure simultaneously with estimation of Φft for the pollen clouds. We show that the results are only moderately affected by changes in the decay function, a result of some importance since no completely established theory is available for this function.

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Section: Discussionmentioning

confidence: 99%

Two-generation analysis of pollen flow across a landscape. III. Impact of adult population structure

2001

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“…Therefore, the impact of these factors is yet scarce, possibly explaining the delayed dilution of the postdisturbance spatial genetic structure. Populations with even age structure or non-overlapping generations are expected to have more spatial structure than populations with multiple overlapping generations (Doligez et al 1998;Jones and Hubbell 2006;Schnabel et al 1991). Hence, in Quilanlahue, the wider and more flattened age distribution (mean age 170 years) indicates that mature trees were recruited over a longer period probably by high outcrossing rates and seed sources, leading to a weaker spatial genetic structure.…”

Section: Discussionmentioning

confidence: 99%

Stand development stages and recruitment patterns influence fine-scale spatial genetic structure in two Patagonian Nothofagus species

Sola

Marchelli

Gallo

et al. 2022

Annals of Forest Science

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Key message Nothofagus alpina (Poepp. et Endl.) Oerst. and Nothofagus obliqua (Mirb.) Oerst forests have strong fine-scale spatial genetic structures. The intensity of genetic structure patterns differed according to species, stand development stages, life stages, and spatial arrangement of regeneration groups. This data becomes useful for forest management as it provides an understanding of how populations evolve as well as of the consequences of disturbances and enables the establishment of sampling strategies. Context The understanding of fine-scale spatial genetic structure in natural populations is useful for forest management. Although Nothofagus alpina (Poepp. et Endl.) Oerst. and N. obliqua (Mirb.) are important species of the Patagonian forest, little is known about the genetic structure of their populations. Aims The main objectives were to investigate the differences in fine-scale spatial genetic structure among mature tree populations of both species considering two stands at different development stages. Genetic structure was also evaluated among life stages and spatial distribution groups of regeneration within the old-growth stand. Methods Genetic structure was examined by microsatellite DNA analysis of regeneration and mature tree populations of both species (around 1300 individuals). Gene dispersal distance was additionally estimated. Results In both stands and species, strong fine-scale spatial genetic structure and short dispersal distance were found. This pattern was stronger in the early successional forest, in N. obliqua populations, in earlier life stages, and in scattered regeneration. Conclusion Stand development stages and recruitment patterns influence the fine-scale spatial genetic structure of both Nothofagus species. However, the genetic structure also differs between species.

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“…It means the A. sieboldii metapopulation in Eobi valley has genetically significantly differentiated despite the narrow range. It is estimated there was little genetic flow (N m = 0.412) between subpopulations, which means that A. sieboldii metapopulation of the Eobi valley formed a spatial genetic structure (Doligez et al 1998).…”

Section: Discussionmentioning

confidence: 99%

Small-scale spatial genetic structure of Asarum sieboldii metapopulation in a valley

Jeong

Kim

2021

j ecology environ

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Background Asarum sieboldii Miq., a species of forest understory vegetation, is an herbaceous perennial belonging to the family Aristolochiaceae. The metapopulation of A. sieboldii is distributed sparsely and has a short seed dispersal distance by ants as their seed distributor. It is known that many flowers of A. sieboldii depend on self-fertilization. Because these characteristics can affect negatively in genetic structure, investigating habitat structure and assessment of genetic structure is needed. A total of 27 individuals in a valley were sampled for measuring genetic diversity, genetic distance, and genetic differentiation by RAPD-PCR. Results The habitat areas of A. sieboldii metapopulation were relatively small (3.78~33.60 m2) and population density was very low (five to seven individuals in 20×20 m quadrat). The habitat of A. sieboldii was a very shady (relative light intensity = 0.9%) and mature forest with a high evenness value (J = 0.81~0.99) and a low dominance value (D = 0.19~0.28). The total genetic diversity of A. sieboldii was quite high (h = 0.338, I = 0.506). A total of 33 band loci were observed in five selected primers, and 31 band loci (94%) were polymorphic. However, genetic differentiation along the valley was highly progressed (Gst = 0.548, Nm = 0.412). The average genetic distance between subpopulations was 0.387. The results of AMOVA showed 52.77% of variance occurs among populations, which is evidence of population structuring. Conclusions It is expected that a small-scale founder effect had occurred, an individual spread far from the original subpopulation formed a new subpopulation. However, geographical distance between individuals would have been far and genetic flow occurred only within each subpopulation because of the low density of population. This made significant genetic distance between the original and new population by distance. Although genetic diversity of A. sieboldii metapopulation is not as low as concerned, the subpopulation of A. sieboldii can disappear by stochastic events due to small subpopulation size and low density of population. To prevent genetic isolation and to enhance the stable population size, conservative efforts such as increasing the size of each subpopulation or the connection between subpopulations are needed.

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Fine-Scale Spatial Genetic Structure with Nonuniform Distribution of Individuals

Cited by 90 publications

References 28 publications

Two-generation analysis of pollen flow across a landscape. III. Impact of adult population structure

Two-generation analysis of pollen flow across a landscape. III. Impact of adult population structure

Stand development stages and recruitment patterns influence fine-scale spatial genetic structure in two Patagonian Nothofagus species

Small-scale spatial genetic structure of Asarum sieboldii metapopulation in a valley

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