Molecular phylogenetic, population genetic and demographic studies of Nodularia douglasiae and Nodularia breviconcha based on CO1 and 16S rRNA

Abstract Freshwater mussels belonging to the genus Nodularia (Family Unionidae) are known to be widely distributed in East Asia. Although phylogenetic and population genetic studies have been performed for these species, there still remain unresolved questions in their taxonomic status and biogeographic distribution pathways. Here, the nucleotide sequences of CO1 and 16S rRNA were newly determined from 86 N. douglasiae and 83 N. breviconcha individuals collected on the Korean Peninsula. Based on these data, we revealed the following results: (1) N. douglasiae can be divided into the three genetic clades of A (only found in Korean Peninsula), B (widely distributed in East Asia), and C (only found in the west of China and Russia), (2) the clade A is not an independent species but a concrete member of N. douglasiae given the lack of genetic differences between the clades A and B, and (3) N. breviconcha is not a subspecies of N. douglasiae but an independent species apart from N. douglasiae. In addition, we suggested the plausible scenarios of biogeographic distribution events and demographic history of Nodularia species.

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The Genetic History of France

10.1101/712497 ◽

2019 ◽

Author(s):

Aude Saint Pierre ◽

Joanna Giemza ◽

Matilde Karakachoff ◽

Isabel Alves ◽

Philippe Amouyel ◽

...

Keyword(s):

Genetic Structure ◽

Demographic History ◽

Migration Routes ◽

Effective Population ◽

Genetic Studies ◽

Independent Population ◽

Genome Wide Data ◽

Population Sizes ◽

History Of ◽

Exhaustive Study

ABSTRACTThe study of the genetic structure of different countries within Europe has provided significant insights into their demographic history and their actual stratification. Although France occupies a particular location at the end of the European peninsula and at the crossroads of migration routes, few population genetic studies have been conducted so far with genome-wide data. In this study, we analyzed SNP-chip genetic data from 2 184 individuals born in France who were enrolled in two independent population cohorts. Using FineStructure, six different genetic clusters of individuals were found that were very consistent between the two cohorts. These clusters match extremely well the geography and overlap with historical and linguistic divisions of France. By modeling the relationship between genetics and geography using EEMS software, we were able to detect gene flow barriers that are similar in the two cohorts and corresponds to major French rivers or mountains. Estimations of effective population sizes using IBDNe program also revealed very similar patterns in both cohorts with a rapid increase of effective population sizes over the last 150 generations similar to what was observed in other European countries. A marked bottleneck is also consistently seen in the two datasets starting in the fourteenth century when the Black Death raged in Europe. In conclusion, by performing the first exhaustive study of the genetic structure of France, we fill a gap in the genetic studies in Europe that would be useful to medical geneticists but also historians and archeologists.

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Crustal evolution history of Korean Peninsula in East Asia: The significance of Nd, Ce isotopic and REE data from the Korean Precambrian gneisses.

GEOCHEMICAL JOURNAL ◽

10.2343/geochemj.35.175 ◽

2001 ◽

Vol 35 (3) ◽

pp. 175-187 ◽

Cited By ~ 13

Author(s):

Seung-Gu Lee ◽

Akimasa Masuda ◽

Hiroshi Shimizu ◽

Yong-Sun Song

Keyword(s):

East Asia ◽

Korean Peninsula ◽

Crustal Evolution ◽

History Of

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Early diversification and permeable species boundaries in the Mediterranean firs

Annals of Botany ◽

10.1093/aob/mcz186 ◽

2019 ◽

Vol 125 (3) ◽

pp. 495-507 ◽

Cited By ~ 2

Author(s):

Francisco Balao ◽

María Teresa Lorenzo ◽

José Manuel Sánchez-Robles ◽

Ovidiu Paun ◽

Juan Luis García-Castaño ◽

...

Keyword(s):

Phylogenetic Relationships ◽

Evolutionary History ◽

Taxonomic Status ◽

Nucleotide Polymorphisms ◽

Single Nucleotide ◽

Early Diversification ◽

Genome Wide ◽

History Of ◽

The Mediterranean ◽

Independent Species

Abstract Background and Aims Inferring the evolutionary relationships of species and their boundaries is critical in order to understand patterns of diversification and their historical drivers. Despite Abies (Pinaceae) being the second most diverse group of conifers, the evolutionary history of Circum-Mediterranean firs (CMFs) remains under debate. Methods We used restriction site-associated DNA sequencing (RAD-seq) on all proposed CMF taxa to investigate their phylogenetic relationships and taxonomic status. Key Results Based on thousands of genome-wide single nucleotide polymorphisms (SNPs), we present here the first formal test of species delimitation, and the first fully resolved, complete species tree for CMFs. We discovered that all previously recognized taxa in the Mediterranean should be treated as independent species, with the exception of Abies tazaotana and Abies marocana. An unexpectedly early pulse of speciation in the Oligocene–Miocene boundary is here documented for the group, pre-dating previous hypotheses by millions of years, revealing a complex evolutionary history encompassing both ancient and recent gene flow between distant lineages. Conclusions Our phylogenomic results contribute to shed light on conifers’ diversification. Our efforts to resolve the CMF phylogenetic relationships help refine their taxonomy and our knowledge of their evolution.

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