Genetic diversity and population history of the migratory catfishes Pangasianodon hypophthalmus and Pangasius bocourti in the Cambodian Mekong River

2006 ◽  
Vol 72 (3) ◽  
pp. 469-476 ◽  
Author(s):  
Nam SO ◽  
Jeroen K J VAN HOUDT ◽  
Filip A M VOLCKAERT
Keyword(s):  
Genetic Diversity ◽  
Population History ◽  
Mekong River ◽  
Pangasianodon Hypophthalmus ◽  
History Of ◽  
Pangasius Bocourti

scholarly journals Population structure and demographic history of the chukar partridge Alectoris chukar in China

2013 ◽  
Vol 59 (4) ◽  
pp. 458-474 ◽  
Author(s):  
Sen Song ◽  
Shijie Bao ◽  
Ying Wang ◽  
Xinkang Bao ◽  
Bei An ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
North America ◽  
Demographic History ◽  
Population Expansion ◽  
Northwest China ◽  
Population History ◽  
Extant Species ◽  
History Of ◽  
Chukar Partridge

Abstract Pleistocene climate fluctuations have shaped the patterns of genetic diversity observed in extant species. Although the effects of recent glacial cycles on genetic diversity have been well studied on species in Europe and North America, genetic legacy of species in the Pleistocene in north and northwest of China where glaciations was not synchronous with the ice sheet development in the Northern Hemisphere or or had little or no ice cover during the glaciations’ period, remains poorly understood. Here we used phylogeographic methods to investigate the genetic structure and population history of the chukar partridge Alec-toris chukar in north and northwest China. A 1,152 – 1,154 bp portion of the mtDNA CR were sequenced for all 279 specimens and a total number of 91 haplotypes were defined by 113 variable sites. High levels of gene flow were found and gene flow estimates were greater than 1 for most population pairs in our study. The AMOVA analysis showed that 81% and 16% of the total genetic variability was found within populations and among populations within groups, respectively. The demographic history of chukar was examined using neutrality tests and mismatch distribution analyses and results indicated Late Pleistocene population expansion. Results revealed that most populations of chukar experienced population expansion during 0.027 ? 0.06 Ma. These results are at odds with the results found in Europe and North America, where population expansions occurred after Last Glacial Maximum (LGM, 0.023 to 0.018 Ma). Our results are not consistent with the results from avian species of Tibetan Plateau, either, where species experienced population expansion following the retreat of the extensive glaciation period (0.5 to 0.175 Ma).

Gene flow from multiple sources maintains high genetic diversity and stable population history of Common MoorhenGallinula chloropusin China

Ibis ◽  
2018 ◽  
Vol 160 (4) ◽  
pp. 855-869 ◽  
Author(s):  
Luzhang Ruan ◽  
Wei Xu ◽  
Yuqing Han ◽  
Chaoying Zhu ◽  
Bicai Guan ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Population History ◽  
Stable Population ◽  
Multiple Sources ◽  
High Genetic Diversity ◽  
History Of

scholarly journals Population Genomic Analyses of Wild and Farmed Striped Catfish Pangasianodon Hypophthalmus in the Lower Mekong River

2020 ◽  
Vol 8 (6) ◽  
pp. 471
Author(s):  
Nguyen Thanh Vu ◽  
Tran Thi Thuy Ha ◽  
Vo Thi Bich Thuy ◽  
Vu Thi Trang ◽  
Nguyen Hong Nguyen
Keyword(s):  
Genetic Diversity ◽  
Mekong River ◽  
Effective Population ◽  
Wild Stock ◽  
Pangasianodon Hypophthalmus ◽  
Population Genomic ◽  
Diversity Assessment ◽  
Genomic Analyses ◽  
In The Wild ◽  
Striped Catfish

The striped catfish Pangasianodon hypophthalmus is an important freshwater fish cultured in many countries where the collection of wild brooders is still widely practiced. Global farming development of this species makes use of significant natural resources that pose challenges for the genetic diversity of striped catfish. Hence, this study aims to conduct a systematic genetic diversity assessment of wild and farmed catfish stocks collected from four major pangasius-farming countries, using a new genotyping by sequencing platform known as DArT-seq technology. Our population genomic analyses using 7263 single-nucleotide polymorphisms (SNPs) after high-quality-control showed that there were two distinct populations of striped catfish in the lower Mekong river: (i) wild catfish from Thailand and (ii) catfish from Cambodia and Vietnam. The genetic diversity was greatest (0.363) in the wild stock from Thailand, but it was lower in farmed and wild stocks in other countries (0.049 to 0.088). The wild stocks were more genetically diverse than the farmed animals (0.103 vs. 0.064). The inbreeding coefficient ranged from 0.004 and 0.109, with the lowest value (−0.499) in the wild animals from Thailand. Molecular inference methods revealed high degree of historical effective population size (1043.9–1258.4), but there was considerable decline in the contemporary estimates in all populations (10.8 to 73.6). Our additional analyses calculating divergent times and migration patterns showed that the wild catfish from Thailand stand out as separate lineages, while those from Cambodia and Vietnam are genetically identical. Our results also indicated that the cultured stock in Bangladesh originated from the lower part of the Mekong river. These findings have significant practical implications in the context of genetic selection and conservation of striped catfish in the region. Collectively, they will contribute to the sustainable development of the striped catfish sector in these countries.

scholarly journals Population Genetic Structure and Genetic Diversity in Twisted-Jaw Fish, Belodontichthys truncatus Kottelat & Ng, 1999 (Siluriformes: Siluridae), from Mekong Basin

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Surapon Yodsiri ◽  
Komgrit Wongpakam ◽  
Adisak Ardharn ◽  
Chadaporn Senakun ◽  
Sutthira Khumkratok
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Demographic History ◽  
Hydropower Plant ◽  
Mekong River ◽  
Demographic Expansion ◽  
High Genetic Diversity ◽  
History Analysis ◽  
History Of ◽  
Important Food Source

The Mekong River and its tributaries possess the second highest diversity in fish species in the world. However, the fish biodiversity in this river is threatened by several human activities, such as hydropower plant construction. Understanding the genetic diversity and genetic structure of the species is important for natural resource management. Belodontichthys truncatus Kottelat & Ng is endemic to the Mekong River basin and is an important food source for people in this area. In this study, the genetic diversity, genetic structure, and demographic history of the twisted-jaw fish, B. truncatus, were investigated using mitochondrial cytochrome b gene sequences. A total of 124 fish specimens were collected from 10 locations in the Mekong and its tributaries. Relatively high genetic diversity was found in populations of B. truncatus compared to other catfish species in the Mekong River. The genetic structure analysis revealed that a population from the Chi River in Thailand was genetically significantly different from other populations, which is possibly due to the effect of genetic drift. Demographic history analysis indicated that B. truncatus has undergone recent demographic expansion dating back to the end of the Pleistocene glaciation.

scholarly journals Genetic Diversity and Population History of a Critically Endangered Primate, the Northern Muriqui (Brachyteles hypoxanthus)

PLoS ONE ◽  
2011 ◽  
Vol 6 (6) ◽  
pp. e20722 ◽  
Author(s):  
Paulo B. Chaves ◽  
Clara S. Alvarenga ◽  
Carla de B. Possamai ◽  
Luiz G. Dias ◽  
Jean P. Boubli ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population History ◽  
Critically Endangered ◽  
History Of

scholarly journals Hominoid intraspecific cranial variation mirrors neutral genetic diversity

2018 ◽  
Vol 115 (45) ◽  
pp. 11501-11506 ◽  
Author(s):  
Julia M. Zichello ◽  
Karen L. Baab ◽  
Kieran P. McNulty ◽  
Christopher J. Raxworthy ◽  
Michael E. Steiper
Keyword(s):  
Genetic Diversity ◽  
Homo Sapiens ◽  
Population History ◽  
Cranial Morphology ◽  
Shape Variation ◽  
Evolutionary Processes ◽  
Cranial Variation ◽  
History Of ◽  
Fossil Hominin ◽  
Cranial Shape

Natural selection, developmental constraint, and plasticity have all been invoked as explanations for intraspecific cranial variation in humans and apes. However, global patterns of human cranial variation are congruent with patterns of genetic variation, demonstrating that population history has influenced cranial variation in humans. Here we show that this finding is not unique toHomo sapiensbut is also broadly evident across extant ape species. Specifically, taxa that exhibit greater intraspecific cranial shape variation also exhibit greater genetic diversity at neutral autosomal loci. Thus, cranial shape variation within hominoid taxa reflects the population history of each species. Our results suggest that neutral evolutionary processes such as mutation, gene flow, and genetic drift have played an important role in generating cranial variation within species. These findings are consistent with previous work on human cranial morphology and improve our understanding of the evolutionary processes that generate intraspecific cranial shape diversity within hominoids. This work has implications for the analysis of selective and developmental pressures on the cranium and for interpreting shape variation in fossil hominin crania.

Genetic Diversity and Demographic History of an Upper Hill Dipterocarp (Shorea platyclados): Implications for Conservation

2019 ◽  
Vol 110 (7) ◽  
pp. 844-856 ◽  
Author(s):  
Chin-Hong Ng ◽  
Soon-Leong Lee ◽  
Lee-Hong Tnah ◽  
Kevin K S Ng ◽  
Chai-Ting Lee ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Microsatellite Loci ◽  
Gene Diversity ◽  
Demographic History ◽  
Haplotype Diversity ◽  
Population History ◽  
Conservation Strategy ◽  
Ex Situ ◽  
History Of ◽  
Shorea Platyclados

Abstract Southeast Asian rainforests at upper hill elevations are increasingly vulnerable to degradation because most lowland forest areas have been converted to different land uses. As such, understanding the genetics of upper hill species is becoming more crucial for their future management and conservation. Shorea platyclados is an important, widespread upper hill dipterocarp in Malaysia. To elucidate the genetic structure of S. platyclados and ultimately provide guidelines for a conservation strategy for this species, we carried out a comprehensive study of the genetic diversity and demographic history of S. platyclados. Twenty-seven populations of S. platyclados across its range in Malaysia were genotyped at 15 polymorphic microsatellite loci and sequenced at seven noncoding chloroplast DNA (cpDNA) regions. A total of 303 alleles were derived from the microsatellite loci, and 29 haplotypes were identified based on 2892 bp of concatenated cpDNA sequences. The populations showed moderately high genetic diversity (mean HE = 0.680 for microsatellite gene diversity and HT = 0.650 for total haplotype diversity) and low genetic differentiation (FST = 0.060). Bayesian clustering divided the studied populations into two groups corresponding to western and eastern Malaysia. Bottleneck analysis did not detect any recent bottleneck events. Extended Bayesian skyline analyses showed a model of constant size for the past population history of this species. Based on our findings, priority areas for in situ and ex situ conservation and a minimum population size are recommended for the sustainable utilization of S. platyclados.

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