scholarly journals Population history and gene dispersal inferred from spatial genetic structure of a Central African timber tree, Distemonanthus benthamianus (Caesalpinioideae)

Heredity ◽  
2010 ◽  
Vol 106 (1) ◽  
pp. 88-99 ◽  
Author(s):  
G D G Debout ◽  
J-L Doucet ◽  
O J Hardy
Keyword(s):  
Genetic Structure ◽  
Spatial Genetic Structure ◽  
Population History ◽  
Gene Dispersal ◽  
Timber Tree

Spatial genetic structure inMilicia excelsa(Moraceae) indicates extensive gene dispersal in a low-density wind-pollinated tropical tree

2009 ◽  
Vol 18 (21) ◽  
pp. 4398-4408 ◽  
Author(s):  
J.-P. BIZOUX ◽  
K. DAÏNOU ◽  
N. BOURLAND ◽  
O. J. HARDY ◽  
M. HEUERTZ ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Spatial Genetic Structure ◽  
Tropical Tree ◽  
Low Density ◽  
Gene Dispersal

Staying close: short local dispersal distances on a managed forest of two Patagonian Nothofagus species

2020 ◽  
Vol 93 (5) ◽  
pp. 652-661 ◽  
Author(s):  
Georgina Sola ◽  
Verónica El Mujtar ◽  
Leonardo Gallo ◽  
Giovanni G Vendramin ◽  
Paula Marchelli
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
Spatial Genetic Structure ◽  
Pollen Dispersal ◽  
Dispersal Distance ◽  
Restricted Gene Flow ◽  
Fine Scale ◽  
Gene Dispersal ◽  
Mature Trees ◽  
The Impact

Abstract Understanding the impact of management on the dispersal potential of forest tree species is pivotal in the context of global change, given the implications of gene flow on species evolution. We aimed to determine the effect of logging on gene flow distances in two Nothofagus species from temperate Patagonian forests having high ecological relevance and wood quality. Therefore, a total of 778 individuals (mature trees and saplings) of Nothofagus alpina and N. obliqua, from a single plot managed 20 years ago (2.85 hectares), were mapped and genotyped at polymorphic nuclear microsatellite loci. Historical estimates of gene dispersal distance (based on fine-scale spatial genetic structure) and contemporary estimates of seed and pollen dispersal (based on spatially explicit mating models) were obtained. The results indicated restricted gene flow (gene distance ≤ 45 m, both pollen and seed), no selfing and significant seed and pollen immigration from trees located outside the studied plot but in the close surrounding area. The size of trees (diameter at breast height and height) was significantly associated with female and/or male fertility. The significant fine-scale spatial genetic structure was consistent with the restricted seed and pollen dispersal. Moreover, both estimates of gene dispersal (historical and contemporary) gave congruent results. This suggests that the recent history of logging within the study area has not significantly influenced on patterns of gene flow, which can be explained by the silviculture applied to the stand. The residual tree density maintained species composition, and the homogeneous spatial distribution of trees allowed the maintenance of gene dispersal. The short dispersal distance estimated for these two species has several implications both for understanding the evolution of the species and for defining management, conservation and restoration actions. Future replication of this study in other Nothofagus Patagonian forests would be helpful to validate our conclusions.

Limited gene dispersal and spatial genetic structure as stabilizing factors in an ant-plant mutualism

2016 ◽  
Vol 29 (12) ◽  
pp. 2519-2529 ◽  
Author(s):  
P.-J. G. Malé ◽  
C. Leroy ◽  
P. Humblot ◽  
A. Dejean ◽  
A. Quilichini ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Spatial Genetic Structure ◽  
Gene Dispersal ◽  
Stabilizing Factors

scholarly journals Spatial genetic structure in American black bears (Ursus americanus): female philopatry is variable and related to population history

Heredity ◽  
2017 ◽  
Vol 120 (4) ◽  
pp. 329-341 ◽  
Author(s):  
Thea V. Kristensen ◽  
Emily E. Puckett ◽  
Erin L. Landguth ◽  
Jerrold L. Belant ◽  
John T. Hast ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Ursus Americanus ◽  
Spatial Genetic Structure ◽  
Population History ◽  
Black Bears ◽  
Female Philopatry ◽  
American Black ◽  
American Black Bears

scholarly journals Gene dispersal via seeds and pollen and their effects on genetic structure in the facultative-apomictic Neotropical tree Aspidosperma polyneuron

2016 ◽  
Vol 65 (2) ◽  
pp. 46-57 ◽  
Author(s):  
C. L. Chaves ◽  
A. M. Sebbenn ◽  
A. Baranoski ◽  
B. D. Goez ◽  
A. P.S.C. Gaino ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Seed Dispersal ◽  
Sexual Reproduction ◽  
Isolation By Distance ◽  
Spatial Genetic Structure ◽  
Dispersal Distance ◽  
Pollen Flow ◽  
Gene Dispersal ◽  
Asexual Propagation ◽  
Neotropical Tree

Abstract Facultative apomictic trees can produce offspring with a genotype identical to the mother due to asexual propagation through the embryo derived from cells in the maternal ovule tissues. These trees can also produce offspring with a genotype different from the mother due to genetic recombination. For many trees, these reproductive processes remain largely unexplored. Herein, we use microsatellite markers to identify apomictic and sexual reproduction in samples of adult and juvenile trees of the tropical, insect pollinated and wind seed dispersed Aspidosperma polyneuron, within a conservation area in Brazil. We also investigate seed and pollen flow and dispersal patterns and compare the genetic diversity, inbreeding, and intrapopulation spatial genetic structure (SGS) between adults and juveniles in two plots. Our results show that the species present both apomictic and sexual reproduction. Sexual reproduction occurred mainly by outcrossing, but we did detect instances of self-fertilization and mating among relatives, which explains the inbreeding observed in juveniles. Seed dispersal distance was shorter than pollen dispersal distance in one of the plots, suggesting that insect vectors are more efficient in gene dispersal than wind for seed dispersal in a high density tropical forest. The patterns of pollen and seed dispersal showed isolation by distance, explaining the SGS detected for adults and juveniles. Our results show that both seed and pollen flow increase the allelic diversity in the population. The regeneration of apomictic individuals may guarantee the continuation of genotypes adapted specifically to the study site, while sexual reproduction results in new genotypes.

scholarly journals Spatial Genetic Structure within Populations of Sorbus torminalis (L.) Crantz: Comparative Analysis of the Self-incompatibility Locus and Nuclear Microsatellites

2016 ◽  
Vol 58 (1) ◽  
pp. 7-17 ◽  
Author(s):  
Sandra Jankowska-Wroblewska ◽  
Joanna Warmbier ◽  
Jaroslaw Burczyk
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Population Differentiation ◽  
Spatial Genetic Structure ◽  
Population History ◽  
The Self ◽  
Nuclear Microsatellites ◽  
Self Incompatibility ◽  
Sorbus Torminalis ◽  
Incompatibility Locus

AbstractDistribution of genetic diversity among and within plant populations may depend on the mating system and the mechanisms underlying the efficiency of pollen and seed dispersal. In self-incompatible species, negative frequency-dependent selection acting on the self-incompatibility locus is expected to decrease intensity of spatial genetic structure (SGS) and to reduce population differentiation. We investigated two populations (peripheral and more central) of wild service tree (Sorbus torminalis(L.) Crantz), a self-incompatible, scattered tree species to test the differences in population differentiation and spatial genetic structure assessed at the self-incompatibility locus and neutral nuclear microsatellites. Although, both populations exhibited similar levels of genetic diversity regardless of the marker type, significant differentiation was noticed. Differences betweenFSTandRSTsuggested that in the case of microsatellites both mutations and drift were responsible for the observed differentiation level, but in the case of theS-RNaselocus drift played a major role. Microsatellites indicated a similar and significant level of spatial genetic structure in both populations; however, at theS-RNaselocus significant spatial genetic structure was found only in the fragmented population located at the north-eastern species range limits. Differences in SGS between the populations detected at the self-incompatibility locus were attributed mainly to the differences in fragmentation and population history.

GENE DISPERSAL AND SPATIAL GENETIC STRUCTURE

Evolution ◽  
1997 ◽  
Vol 51 (3) ◽  
pp. 672-681 ◽  
Author(s):  
Bryan K. Epperson ◽  
Tian-Quan Li
Keyword(s):  
Genetic Structure ◽  
Spatial Genetic Structure ◽  
Gene Dispersal
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