Fine-scale genetic structure in populations of Quercus variabilis (Fagaceae) from southern Korea

2002 ◽  
Vol 80 (10) ◽  
pp. 1034-1041 ◽  
Author(s):  
Mi Yoon Chung ◽  
Myong Gi Chung
Keyword(s):  
Genetic Structure ◽  
South Korea ◽  
Spatial Autocorrelation ◽  
Spatial Genetic Structure ◽  
Fine Scale ◽  
Genetic Structuring ◽  
Quercus Variabilis ◽  
Southern Korea ◽  
Allozyme Loci ◽  
Landscape Level

Quercus variabilis Blume (Fagaceae) is a deciduous broad-leaved tree, and an important forest element among the hillsides of southern Korea. To date, there are contrasting results with respect to fine-scale spatial genetic structure among adults in populations of several oak species; some studies have shown evidence of significant within-population spatial genetic structure, while others found weak or little evidence of fine-scale genetic structuring within populations. We used allozyme loci, Wright's F statistics, and multilocus spatial autocorrelation statistics to examine the distribution of genetic diversity and the spatial genetic structure within three undisturbed populations at a landscape level (72.5 ha, 500 × 1450 m) on Dolsan Island, South Korea. The spatial autocorrelation analyses of adults showed little evidence of fine-scale genetic structuring within populations, which could be due to random mortality among related seedlings, resulting in extensive thinning within maternal half-sib groups. Alternatively, low genetic differentiation between adjacent populations (mean FST = 0.023) and little within-population spatial genetic structure suggest probable secondary acorn movement by animals. Our results are very similar to those observed in three populations of Quercus acutissima at a landscape level (15 ha, 250 × 600 m) on Oenaro Island, South Korea. Together, these studies describe relatively subtle differences in genetic structure among adjacent populations of oaks on southern islands in Korea.Key words: allozymes, Quercus variabilis, Fagaceae, landscape level, multiple populations, spatial genetic structure.

Spatial genetic structure in populations of Quercus mongolica var. grosseserrata (Fagaceae) from southern Korea

2004 ◽  
Vol 82 (9) ◽  
pp. 1402-1408 ◽  
Author(s):  
Mi Yoon Chung ◽  
Myong Gi Chung
Keyword(s):  
Genetic Structure ◽  
Spatial Autocorrelation ◽  
Spatial Genetic Structure ◽  
Ground Vegetation ◽  
Spatial Autocorrelation Analysis ◽  
Fine Scale ◽  
Autocorrelation Analysis ◽  
Quercus Mongolica ◽  
Acorn Dispersal ◽  
Southern Korea

Multilocus, putative allozyme genotypes were mapped and sampled from two local populations of Quercus mongolica Fischer ex Turcz var. grosseserrata (Bl.) Rehder & Wilson (Fagaceae) (each area is 100 m × 100 m, one with Sasa cover (N = 62) versus a second without it (N = 384)) occurring in undisturbed forests near Nogodan, Mount Jiri in southern Korea. Ripley's L-statistics and spatial autocorrelation analysis (a coancestry coefficient, fij) were used to test the prediction that because of low seedling establishment in a population with dense Sasa cover, there would be no spatial aggregation or hyperdispersion of individual trees and little evidence of fine-scale genetic structure in the population. As predicted, the Sasa-covered population showed no evidence of significant aggregation of individuals (P < 0.01) up to an interplant distance of 50 m and a random distribution of putative genotypes in the population. By contrast, the L-statistics conducted in the Sasa-free population indicated significant aggregation of individuals at interplant distances extending from 4 to 50 m. Spatial autocorrelation analysis revealed small but significant (P < 0.01), positive, fine-scale genetic structure extending from 10 to 30 m. A very similar result was obtained from 100 replicates each consisting of 62 trees in the Sasa-free populations by applying rarefaction and bootstrapping. These findings support the hypothesis that ground vegetation such as Sasa spp. has an impact on fine-scale genetic structure. The weak spatial genetic structure found in the Sasa-free population may primarily be due to limited acorn dispersal coupled with overlapping seed shadows and (or) secondary acorn dispersal by rodents.Key words: allozymes, Fagaceae, ground cover, Quercus mongolica var. grosseserrata, Sasa spp., spatial genetic structure.

scholarly journals Genetic diversity of Nile tilapia (Oreochromis niloticus) throughout West Africa

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Curtis E. Lind ◽  
Seth K. Agyakwah ◽  
Felix Y. Attipoe ◽  
Christopher Nugent ◽  
Richard P. M. A. Crooijmans ◽  
...  
Keyword(s):  
Genetic Structure ◽  
West Africa ◽  
Genetic Resources ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Spatial Genetic Structure ◽  
River Basins ◽  
Fine Scale ◽  
Genetic Structuring ◽  
Volta Basin

AbstractNile tilapia (Oreochromis niloticus) is a globally significant aquaculture species rapidly gaining status as a farmed commodity. In West Africa, wild Nile tilapia genetic resources are abundant yet knowledge of fine-scale population structure and patterns of natural genetic variation are limited. Coinciding with this is a burgeoning growth in tilapia aquaculture in Ghana and other countries within the region underpinned by locally available genetic resources. Using 192 single nucleotide polymorphism (SNP) markers this study conducted a genetic survey of Nile tilapia throughout West Africa, sampling 23 wild populations across eight countries (Benin, Burkina Faso, Côte d’Ivoire, Ghana, Togo, Mali, Gambia and Senegal), representing the major catchments of the Volta, Niger, Senegal and Gambia River basins. A pattern of isolation-by-distance and significant spatial genetic structure was identified throughout West Africa (Global FST = 0.144), which largely corresponds to major river basins and, to a lesser extent, sub-basins. Two populations from the Gambia River (Kudang and Walekounda), one from the western Niger River (Lake Sélingué) and one from the upper Red Volta River (Kongoussi) showed markedly lower levels of diversity and high genetic differentiation compared to all other populations, suggesting genetically isolated populations occurring across the region. Genetic structure within the Volta Basin did not always follow the pattern expected for sub-river basins. This study identifies clear genetic structuring and differentiation amongst West African Nile tilapia populations, which concur with broad patterns found in previous studies. In addition, we provide new evidence for fine-scale genetic structuring within the Volta Basin and previously unidentified genetic differences of populations in Gambia. The 192 SNP marker suite used in this study is a useful tool for differentiating tilapia populations and we recommend incorporating this marker suite into future population screening of O. niloticus. Our results form the basis of a solid platform for future research on wild tilapia genetic resources in West Africa, and the identification of potentially valuable germplasm for use in ongoing breeding programs for aquaculture.

scholarly journals Landscape-Level and Fine-Scale Genetic Structure of the Neotropical TreeProtium spruceanum(Burseraceae)

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Fábio de Almeida Vieira ◽  
Cristiane Gouvêa Fajardo ◽  
Anderson Marcos de Souza ◽  
Dulcinéia de Carvalho
Keyword(s):  
Genetic Structure ◽  
Spatial Genetic Structure ◽  
Spatial Scales ◽  
Conservation Strategies ◽  
Forest Fragments ◽  
Fine Scale ◽  
Conservation Units ◽  
Significant Genetic Structure ◽  
Protium Spruceanum ◽  
Allozyme Loci

Knowledge of genetic structure at different scales and correlation with the current landscape is fundamental for evaluating the importance of evolutionary processes and identifying conservation units. Here, we used allozyme loci to examine the spatial genetic structure (SGS) of 230 individuals ofProtium spruceanum, a native canopy-emergent in five fragments of Brazilian Atlantic forest (1 to 11.8 ha), and four ecological corridors (460 to 1 000 m length). Wright's statistic and Mantel tests revealed little evidence of significant genetic structure at the landscape-scale (; , ). At fine-scale SGS, low levels of relatedness within fragments and corridors (, ) were observed. Differences in the levels and distribution of the SGS at both spatial scales are discussed in relation to biological and conservation strategies of corridors and forest fragments.

scholarly journals Fine-Scale Patterns of Genetic Structure in the Host Plant Chamaecrista fasciculata (Fabaceae) and Its Nodulating Rhizobia Symbionts

Plants ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1719
Author(s):  
Mahboubeh Hosseinalizadeh Nobarinezhad ◽  
Lisa E. Wallace
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
Spatial Autocorrelation ◽  
Host Plant ◽  
Host Plants ◽  
Spatial Genetic Structure ◽  
Genetic Identity ◽  
Fine Scale ◽  
Chamaecrista Fasciculata ◽  
Limited Gene Flow

In natural plant populations, a fine-scale spatial genetic structure (SGS) can result from limited gene flow, selection pressures or spatial autocorrelation. However, limited gene flow is considered the predominant determinant in the establishment of SGS. With limited dispersal ability of bacterial cells in soil and host influence on their variety and abundance, spatial autocorrelation of bacterial communities associated with plants is expected. For this study, we collected genetic data from legume host plants, Chamaecrista fasciculata, their Bradyrhizobium symbionts and rhizosphere free-living bacteria at a small spatial scale to evaluate the extent to which symbiotic partners will have similar SGS and to understand how plant hosts choose among nodulating symbionts. We found SGS across all sampled plants for both the host plants and nodulating rhizobia, suggesting that both organisms are influenced by similar mechanisms structuring genetic diversity or shared habitat preferences by both plants and microbes. We also found that plant genetic identity and geographic distance might serve as predictors of nodulating rhizobia genetic identity. Bradyrhizobium elkanii was the only type of rhizobia found in nodules, which suggests some level of selection by the host plant.

scholarly journals Fine-scale spatial genetic structure of sycamore maple (Acer pseudoplatanus L.)

2011 ◽  
Vol 131 (3) ◽  
pp. 739-746 ◽  
Author(s):  
Madhav Pandey ◽  
Oliver Gailing ◽  
Hans H. Hattemer ◽  
Reiner Finkeldey
Keyword(s):  
Genetic Structure ◽  
Spatial Genetic Structure ◽  
Acer Pseudoplatanus ◽  
Fine Scale ◽  
Sycamore Maple

scholarly journals Are patterns of fine-scale spatial genetic structure consistent between sites within tropical tree species?

PLoS ONE ◽  
2018 ◽  
Vol 13 (3) ◽  
pp. e0193501
Author(s):  
James R. Smith ◽  
Jaboury Ghazoul ◽  
David F. R. P. Burslem ◽  
Akira Itoh ◽  
Eyen Khoo ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Tree Species ◽  
Spatial Genetic Structure ◽  
Tropical Tree ◽  
Fine Scale ◽  
Tropical Tree Species

Genetic rescue by distant trees mitigates qualitative pollen limitation imposed by fine‐scale spatial genetic structure

2019 ◽  
Vol 28 (19) ◽  
pp. 4363-4374 ◽  
Author(s):  
Antonio R. Castilla ◽  
Pedro J. Garrote ◽  
Magdalena Żywiec ◽  
Gemma Calvo ◽  
Alberto Suárez‐Esteban ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Pollen Limitation ◽  
Spatial Genetic Structure ◽  
Fine Scale ◽  
Genetic Rescue
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