scholarly journals Consequences of extensive habitat fragmentation in landscape‐level patterns of genetic diversity and structure in the M editerranean esparto grasshopper

2015 ◽  
Vol 8 (6) ◽  
pp. 621-632 ◽  
Author(s):  
Joaquín Ortego ◽  
María P. Aguirre ◽  
Víctor Noguerales ◽  
Pedro J. Cordero
Keyword(s):  
Genetic Diversity ◽  
Habitat Fragmentation ◽  
Genetic Diversity And Structure ◽  
Landscape Level

scholarly journals Effect of Habitat Fragmentation on the Genetic Diversity and Structure of Peripheral Populations of Beech in Central Italy

2012 ◽  
Vol 103 (3) ◽  
pp. 408-417 ◽  
Author(s):  
Stefano Leonardi ◽  
Paolo Piovani ◽  
Marta Scalfi ◽  
Andrea Piotti ◽  
Raffaello Giannini ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Habitat Fragmentation ◽  
Central Italy ◽  
Peripheral Populations ◽  
Genetic Diversity And Structure

scholarly journals Genetic diversity and population structure of the endangered basal angiospermBrasenia schreberi(Cabombaceae) in China

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5296 ◽  
Author(s):  
Zhi-Zhong Li ◽  
Andrew W. Gichira ◽  
Qing-Feng Wang ◽  
Jin-Ming Chen
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Habitat Fragmentation ◽  
Glacial Refugia ◽  
Mantel Test ◽  
Ex Situ ◽  
Brasenia Schreberi ◽  
Genetic Diversity And Structure ◽  
Rare And Endangered

Brasenia schreberiJ.F. Gmelin (Cabombaceae), an aquatic herb that occurs in fragmented locations in China, is rare and endangered. Understanding its genetic diversity and structure is crucial for its conservation and management. In this study, 12 microsatellite markers were used to estimate the genetic diversity and variation in 21 populations ofB. schreberiin China. A total of 61 alleles were found; assessment of allelic richness (Ar = 1.92) and observed and expected heterozygosity (HO= 0.200,HE= 0.256) suggest lower genetic diversity compared to some endangered species, and higher variation was observed within populations (58.68%) rather than among populations (41.32%). No significant correlation between geographical and genetic distance among populations was detected (Mantel test,r= 0.0694;P= 0.7985), which may have likely resulted from barriers to gene flow (Nm = 0.361) that were produced by habitat fragmentation. However, Bayesian and neighbor-joining cluster analyses suggest a population genetic structure consisting of two clusters (I and II) or four subclusters (I-1, 2 and II-1, 2). The genetic structure and distribution ofB. schreberiin China may have involved glacial refugia that underwent range expansions, introgression, and habitat fragmentation. The findings of the present study emphasize the importance for both in situ and ex situ conservation efforts.

scholarly journals Spatial Genetic Structure of Prunus mongolica in Arid Northwestern China Based on RAD Sequencing Data

Diversity ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 397
Author(s):  
Hong-Xiang Zhang ◽  
Qian Wang ◽  
Zhi-Bin Wen
Keyword(s):  
Genetic Diversity ◽  
Habitat Fragmentation ◽  
Northwestern China ◽  
Distribution Model ◽  
Geographical Isolation ◽  
Marginal Populations ◽  
Arid Northwestern China ◽  
Distribution Ranges ◽  
Genetic Diversity And Structure ◽  
Low Levels

The extensive range of sand deserts, gravel deserts, and recent human activities have shaped habitat fragmentation of relict and endangered plants in arid northwestern China. Prunus mongolica is a relict and endangered shrub that is mainly distributed in the study area. In the present study, population genomics was integrated with a species distribution model (SDM) to investigate the spatial genetic diversity and structure of P. mongolica populations in response to habitat fragmentation and create a proposal for the conservation of this endangered species. The results showed that the northern marginal populations were the first isolated from other populations. The SDM suggested that these marginal populations had low levels of habitat suitability during the glacial period. They could not obtain migration corridors, and thus possessed low levels of gene flow connection with other populations. Additionally, several populations underwent secondarily geographical isolation from other central populations, which preserved particular genetic lineages. Genetic diversity was higher in southern populations than in northern ones. It was concluded that long-term geographical isolation after historical habitat fragmentation promoted the divergence of marginal populations and refugial populations along mountains from other populations. The southern populations could have persisted in their distribution ranges and harbored higher levels of genetic diversity than the northern populations, whose distribution ranges fluctuated in response to paleoclimatic changes. We propose that the marginal populations of P. mongolica should be well considered in conservation management.

scholarly journals Genetic diversity and population structure of Plasmodium falciparum in Nigeria: insights from microsatellite loci analysis

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Fehintola V. Ajogbasile ◽  
Adeyemi T. Kayode ◽  
Paul E. Oluniyi ◽  
Kazeem O. Akano ◽  
Jessica N. Uwanibe ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Plasmodium Falciparum ◽  
Population Structure ◽  
Microsatellite Loci ◽  
Control Strategies ◽  
Population Diversity ◽  
Parasite Population ◽  
Nested Polymerase Chain Reaction ◽  
Public Health Burden ◽  
Genetic Diversity And Structure

Abstract Background Malaria remains a public health burden especially in Nigeria. To develop new malaria control and elimination strategies or refine existing ones, understanding parasite population diversity and transmission patterns is crucial. Methods In this study, characterization of the parasite diversity and structure of Plasmodium falciparum isolates from 633 dried blood spot samples in Nigeria was carried out using 12 microsatellite loci of P. falciparum. These microsatellite loci were amplified via semi-nested polymerase chain reaction (PCR) and fragments were analysed using population genetic tools. Results Estimates of parasite genetic diversity, such as mean number of different alleles (13.52), effective alleles (7.13), allelic richness (11.15) and expected heterozygosity (0.804), were high. Overall linkage disequilibrium was weak (0.006, P < 0.001). Parasite population structure was low (Fst: 0.008–0.105, AMOVA: 0.039). Conclusion The high level of parasite genetic diversity and low population structuring in this study suggests that parasite populations circulating in Nigeria are homogenous. However, higher resolution methods, such as the 24 SNP barcode and whole genome sequencing, may capture more specific parasite genetic signatures circulating in the country. The results obtained can be used as a baseline for parasite genetic diversity and structure, aiding in the formulation of appropriate therapeutic and control strategies in Nigeria.

Genetic diversity and structure among Iranian tall fescue populations based on genomic-SSR and EST-SSR marker analysis

2009 ◽  
Vol 282 (1-2) ◽  
pp. 57-70 ◽  
Author(s):  
Majid Sharifi Tehrani ◽  
Mohsen Mardi ◽  
Jamal Sahebi ◽  
Pilar Catalán ◽  
Antonio Díaz-Pérez
Keyword(s):  
Genetic Diversity ◽  
Tall Fescue ◽  
Ssr Marker ◽  
Marker Analysis ◽  
Genetic Diversity And Structure ◽  
Genomic Ssr

scholarly journals The use of esterase polymorphism for analysis of the genetic diversity and structure of stevia (Stevia rebaudiana Bert. Bertoni) populations

2011 ◽  
Vol 39 (4-6) ◽  
pp. 594-599 ◽  
Author(s):  
Vanda Marilza de Carvalho ◽  
Carlos Alexandre Marochio ◽  
Claudete Aparecida Mangolin ◽  
Maria de Fátima Pires da Silva Machado
Keyword(s):  
Genetic Diversity ◽  
Stevia Rebaudiana ◽  
Genetic Diversity And Structure ◽  
Esterase Polymorphism
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