scholarly journals Phylogeography of the South China Field Mouse (Apodemus draco) on the Southeastern Tibetan Plateau Reveals High Genetic Diversity and Glacial Refugia

PLoS ONE ◽  
2012 ◽  
Vol 7 (5) ◽  
pp. e38184 ◽  
Author(s):  
Zhenxin Fan ◽  
Shaoying Liu ◽  
Yang Liu ◽  
Lihuan Liao ◽  
Xiuyue Zhang ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Tibetan Plateau ◽  
South China ◽  
Glacial Refugia ◽  
Field Mouse ◽  
The South ◽  
High Genetic Diversity ◽  
Southeastern Tibetan Plateau

scholarly journals Late Pleistocene-dated divergence between South Hemisphere populations of the non-conventional yeast L. cidri.

2022 ◽  
Author(s):  
Pablo Villarreal ◽  
Carlos Villarroel ◽  
Samuel O’Donnell ◽  
Nicolas Agier ◽  
Julian Quintero-Galvis ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Phenotypic Diversity ◽  
Divergence Time ◽  
Glacial Refugia ◽  
Ecological Niches ◽  
Natural Environments ◽  
South American ◽  
The South ◽  
Adaptive Genetic Variation ◽  
High Genetic Diversity

Most organisms belonging to the Saccharomycotina subphylum have high genetic diversity and a vast repertoire of metabolisms and lifestyles, which explains its ecological versatility. The yeast Lachancea cidri is an ideal model for exploring the interplay between genetics, ecological function and evolution. L. cidri is a species that diverged from the Saccharomyces lineage before the whole-genome duplication and exhibits a broad distribution across the South Hemisphere, thus displaying an important ecological success. Here, we applied phylogenomics to investigate the adaptive genetic variation of L. cidri isolates obtained from natural environments in Australia and South America. Our approach revealed the presence of two main lineages according to their geographic distribution (Aus and SoAm). Estimation of the divergence time suggest that South American and Australian lineages diverged near the last glacial maximum event during the Pleistocene (64-8 KYA), consistent with the presence of multiple glacial refugia. Interestingly, we found that the French reference strain belongs to the Australian lineage, with a recent divergence (405-51 YA), likely associated to human movements. Additionally, species delimitation analysis identified different evolutionary units within the South American lineage and, together with parameters like Pi (π) and FST, revealed that Patagonia contains most of the genetic diversity of this species. These results agree with phenotypic characterizations, demonstrating a greater phenotypic diversity in the South American lineage. These findings support the idea of a Pleistocene-dated divergence between South Hemisphere lineages, where the Nothofagus and Araucaria ecological niches likely favored the extensive distribution of L. cidri in Patagonia.

scholarly journals Genetic Diversity and Population Divergence of a Rare, Endemic Grass (Elymus breviaristatus) in the Southeastern Qinghai-Tibetan Plateau

2019 ◽  
Vol 11 (20) ◽  
pp. 5863 ◽  
Author(s):  
Qingqing Yu ◽  
Qian Liu ◽  
Yi Xiong ◽  
Yanli Xiong ◽  
Zhixiao Dong ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Tibetan Plateau ◽  
Isolation By Distance ◽  
Genetic Distances ◽  
Conservation Strategy ◽  
Conservation Strategies ◽  
Grass Species ◽  
Population Divergence ◽  
High Genetic Diversity ◽  
Widespread Species

Elymus breviaristatus is a grass species only distributed in the southeast of Qinghai-Tibetan Plateau (QTP), which has suffered from serious habitat fragmentation. Therefore, understanding patterns of genetic diversity within and among natural E. breviaristatus populations could provide insight for future conservation strategies. In this study, sequence-related amplified polymorphism markers were employed to investigate the genetic diversity and hierarchical structure of seven E. breviaristatus populations from QTP, China. Multiple measures of genetic diversity indicated that there is low to moderate genetic variation within E. breviaristatus populations, consistent with its presumed mating system. In spite of its rarity, E. breviaristatus presented high genetic diversity that was equivalent to or even higher than that of widespread species. Bayesian clustering approaches, along with clustering analysis and principal coordinate analysis partitioned the studied populations of E. breviaristatus into five genetic clusters. Differentiation coefficients (Fst, GST, etc.) and AMOVA analysis revealed considerable genetic divergence among different populations. BARRIER analyses indicated that there were two potential barriers to gene flow among the E. breviaristatus populations. Despite these patterns of differentiation, genetic distances between populations were independent of geographic distances (r = 0.2197, p = 0.2534), indicating little isolation by distance. Moreover, despite detecting a common outlier by two methods, bioclimatic factors (altitude, annual mean temperature, and annual mean precipitation) were not related to diversity parameters, indicating little evidence for isolation caused by the environment. These patterns of diversity within and between populations are used to propose a conservation strategy for E. breviaristatus.

scholarly journals Changing Relationship Between Tibetan Plateau Temperature and South China Sea Summer Monsoon Precipitation

2020 ◽  
Vol 8 ◽  
Author(s):  
Mei Liang ◽  
Jianjun Xu ◽  
Johnny C. L. Chan ◽  
Liguang Wu ◽  
Xiangde Xu
Keyword(s):  
Tibetan Plateau ◽  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
Negative Correlation ◽  
The South China Sea ◽  
Monsoon Precipitation ◽  
The South ◽  
China Sea ◽  
The Relationship

The present study documents the changes in the relationship between the Tibetan Plateau summer surface temperature (TPST) and the South China Sea summer monsoon precipitation (SCSSMP). A stepwise regression model is used to exclude the signals of global warming, El Niño–Southern Oscillation (ENSO), western North Pacific Subtropical High (WNPSH), Atlantic Multidecadal Oscillation (AMO) and Pacific Decadal Oscillation (PDO). The results indicate that the relationship between TPST–SCSSMP changes with time, going from a negative correlation during the period of 1980–1994 to an obvious positive correlation during 1998–2016 in the South China Sea. Meanwhile, the negative correlation between TPST and the East Asia subtropical front (Meiyu) is enhanced during 1998–2016. This change in the TPST–SCSSMP relationship is associated with the change of the atmospheric circulation, which is mainly due to TPST interdecadal variation. A wave–like structure at the low latitude moves eastward along the low–level monsoon flow, and a strong cyclonic circulation is apparent in the southwestern part of the Plateau, including the Indochina Peninsula, South China Sea, and the ocean to the east of the Philippines, which is consistent with the negative correlation between TPST and Outgoing Longwave Radiation (OLR). The increase in water–vapor convergence and more favorable convection conditions lead to more precipitation in the region after the late 1990s. The present results suggest that, in a changing climate, we should be cautious when using predictor with interdecadal variations.

Genetic diversity and large-scale connectivity of the scleractinian coral Porites lutea in the South China Sea

Coral Reefs ◽  
2018 ◽  
Vol 37 (4) ◽  
pp. 1259-1271 ◽  
Author(s):  
Wen Huang ◽  
Ming Li ◽  
Kefu Yu ◽  
Yinghui Wang ◽  
Jingjing Li ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
South China Sea ◽  
South China ◽  
Scleractinian Coral ◽  
Large Scale ◽  
The South China Sea ◽  
The South ◽  
Porites Lutea ◽  
China Sea

Palaeomagnetic constraints on Himalayan-Tibetan tectonic evolution

1988 ◽  
Vol 326 (1589) ◽  
pp. 177-188 ◽  
Keyword(s):  
Tibetan Plateau ◽  
South China ◽  
Large Scale ◽  
Indian Subcontinent ◽  
Eastern China ◽  
Crustal Thickening ◽  
The Tibetan Plateau ◽  
South China Block ◽  
The South ◽  
Palaeomagnetic Data

Palaeomagnetic data from the Lhasa, Qiangtang and Kunlun Terranes of the Tibetan Plateau are used with data from stable Eurasia, eastern China and Indochina, to test different models of crustal thickening in the Tibetan Plateau, to attempt a Carboniferous palaeogeographic reconstruction, and to calculate the relative motion between the South China Block and the Indochina Block. The data suggest that since the onset of the India—Eurasia collision, the Lhasa Terrane has moved 2000 + 800 km north with respect to stable Eurasia. This indicates that strong internal defomation must have taken place in southern Eurasia since the collision, and thus challenges the model of large-scale underthrusting of the Indian subcontinent beneath the Tibetan Plateau as the mechanism for crustal thickening in Tibet. Palaeomagnetic results from the Kunlun Terrane show that it was at 22° south latitude during the Carboniferous. A Carboniferous reconstruction is presented in which the Kunlun and Qiangtang Terranes, several Indochina terranes, and the North and South China Blocks are grouped together. These units of continental crust all share the specific tropical and subtropical Cathaysian flora, and the group is therefore called the Cathaysian composite continent. To test the model of propagating extrusion tectonics, we have used newly available palaeomagnetic results from South China and Indochina to calculate probable displacements. This exercise suggests a rotation of about 8° of Indochina with respect to the South China Block that is smaller than the predicted rotation of 40°, A large eastward translation of the South China Block relative to the Indochina Block of about 1500 km is consistent with the palaeomagnetic data.

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