Global climate change is a threat to animals in nearly all biomes and ecosystems, especially for ectotherm whose life activities highly depend on environmental thermal regime. Population genetic diversity which is ess...Global climate change is a threat to animals in nearly all biomes and ecosystems, especially for ectotherm whose life activities highly depend on environmental thermal regime. Population genetic diversity which is essential for adaptation to environmental change is a useful index for long-term species survival. In this paper, genetic diversity of eight Phrynocephalus forsythii population which distributed in Tarim Basin, China, were evaluated based on three mtDNA gene and its correlation with environment factors were investigated using RDA. Our result revealed that, the level of genetic diversity of P. forsythii populations was related to its location but there was no significant correlation between genetic distances and geographic distances in P. forsythii. However, we find that mtDNA of P. forsythii was subjected to selection pressure during evolution and population genetic diversity was significantly positively related to variation coefficient of rainfall(VCR) and altitude(AL), while significantly negatively related to longitude(N) and annual average temperature(AAT). Our result supported the previous prediction that excessive ambient heat is a threat to P. forsythii.展开更多
Speciation has never been directly observed in nature because it is a lengthy phenomenon.Although rare,ring species are an optimal natural example of speciation and can be identified through the assessment of the geog...Speciation has never been directly observed in nature because it is a lengthy phenomenon.Although rare,ring species are an optimal natural example of speciation and can be identified through the assessment of the geographical conditions of their potential habitat.Phrynocephalus forsythii is endemic to the Tarim Basin,which compnses the Taklamakan Desert and surrounded by mountains on three sides.This study aimed to determine whether P.forsythii had a ring-species-like divergence pattern through the characterization of the genetic features of 17 populations covering the major distribution of this species.Species distribution modelling revealed that P.forsythii had a continuous circular distribution around the Tarim Basin.Gene flow was observed in most adjacent populations except for two terminal populations of the ring,which exhibit the highest differentiation.Genetic distance and geographic distance were significantly correlated,indicating that the observed differentiation resulted from genetic variation gradually accumulating during population dispersion.Although our results do not definitively indicate that P.forsythii is a ring species,our results indicate a ring-shaped diversification This phenomenon elucidates the potential mechanism underlying speciation in the presence of gene flow,providing insight into this evolutionary process.展开更多
基金supported by the National Natural Science Foundation of China (No. 31471988 and 31200287)
文摘Global climate change is a threat to animals in nearly all biomes and ecosystems, especially for ectotherm whose life activities highly depend on environmental thermal regime. Population genetic diversity which is essential for adaptation to environmental change is a useful index for long-term species survival. In this paper, genetic diversity of eight Phrynocephalus forsythii population which distributed in Tarim Basin, China, were evaluated based on three mtDNA gene and its correlation with environment factors were investigated using RDA. Our result revealed that, the level of genetic diversity of P. forsythii populations was related to its location but there was no significant correlation between genetic distances and geographic distances in P. forsythii. However, we find that mtDNA of P. forsythii was subjected to selection pressure during evolution and population genetic diversity was significantly positively related to variation coefficient of rainfall(VCR) and altitude(AL), while significantly negatively related to longitude(N) and annual average temperature(AAT). Our result supported the previous prediction that excessive ambient heat is a threat to P. forsythii.
基金supported by the National Natural Science Foundation of China (No.31471988 and No.31200287)。
文摘Speciation has never been directly observed in nature because it is a lengthy phenomenon.Although rare,ring species are an optimal natural example of speciation and can be identified through the assessment of the geographical conditions of their potential habitat.Phrynocephalus forsythii is endemic to the Tarim Basin,which compnses the Taklamakan Desert and surrounded by mountains on three sides.This study aimed to determine whether P.forsythii had a ring-species-like divergence pattern through the characterization of the genetic features of 17 populations covering the major distribution of this species.Species distribution modelling revealed that P.forsythii had a continuous circular distribution around the Tarim Basin.Gene flow was observed in most adjacent populations except for two terminal populations of the ring,which exhibit the highest differentiation.Genetic distance and geographic distance were significantly correlated,indicating that the observed differentiation resulted from genetic variation gradually accumulating during population dispersion.Although our results do not definitively indicate that P.forsythii is a ring species,our results indicate a ring-shaped diversification This phenomenon elucidates the potential mechanism underlying speciation in the presence of gene flow,providing insight into this evolutionary process.
