This study presents a comprehensive phylogenetic analysis on Batrachospermaceae based on key taxonomic identifiers(rbcL,psaA,psbA,and COI-5P)from some genera.To systematically explore the phylogenetic relationships an...This study presents a comprehensive phylogenetic analysis on Batrachospermaceae based on key taxonomic identifiers(rbcL,psaA,psbA,and COI-5P)from some genera.To systematically explore the phylogenetic relationships and taxonomy within Batrachospermaceae,we integrated molecular and morphological data,and explored the phylogeny,character evolution,and ancestral geographical origin and provided a theoretical support for the classification and geographic origination of Batrachospermaceae.Our findings reveal distinct relationships within the phylogenetic tree.Notably,10 genera(Sirodotia,Batrachospermum,Tuomeya,Volatus,Lympha,Nothocladus,Torularia,Sheathia,Nocturama,and Petrohua)are closely associated in the rbcL phylogenetic tree.Additionally,four genera(Kumanoa,Hoefkenia,Notohesperus,and Virescentia)exhibit high support ratios,indicating their close interrelations.Other genera,including Paludicola,Visia,Acarposporophycos,Macrosporophycos,Visioidea,Balliopsis,and Psilosiphon,exhibit clustering traits.Furthermore,the multigene sequences provide a robust support for Montagnia that forms a monophyletic group.Ancestral reconstruction of morphological characters identifies nine primitive character states,including whorl,fascicle length,cortical cells,secondary fascicles,the shape of carpogonical branch,spermatangia,carposporophyte,carpogonium and trichogyne,with Visia likely representing ancestral traits in Batrachospermaceae.Furthermore,geographical origin maps suggest a potential common ancestral of Batrachospermaceae origin in the American continent.Additional to conventional analyses,including evolutionary and ancestral reconstruction investigations into key morphological characters,we attempt to reconstruct the biogeography within the Batrachospermaceae,thus contributing to a nuanced understanding of its origin.展开更多
Stephanodiscaceae is one of the most diverse family of the freshwater centric diatoms.However,the scarcity of whole plastome data poses a significant challenge to the undertaking of genomic studies on this taxonomic g...Stephanodiscaceae is one of the most diverse family of the freshwater centric diatoms.However,the scarcity of whole plastome data poses a significant challenge to the undertaking of genomic studies on this taxonomic group.We collected data on the plastid genomes from 33 members of the Stephanodiscaceae and its close relatives,including 12 newly-sequenced genomes and 21 deposited in National Center for Biotechnology Information(NCBI).Phylogenetic trees are yielded five major clades based on homologous genes.The features of the plastid genomes,including repeat sequences,codon usage,and selection pressure for each clade,are analyzed.The paper makes a contribution to the field of diatom genomics by describing the structural characteristics of the plastid genomes in the Stephanodiscaceae and its closely related species,complemented by related analyses.It provides crucial data that will serve as indispensable references for future research.展开更多
城市化进程中的土地开发、水利工程建设等活动对淡水生态系统造成了不可逆转的损害。这些行为严重破坏了淡水生态系统的自然结构和功能,水质污染问题日益严重,生物栖息地逐渐丧失,这对淡水生物多样性和生态平衡构成了巨大威胁。识别导...城市化进程中的土地开发、水利工程建设等活动对淡水生态系统造成了不可逆转的损害。这些行为严重破坏了淡水生态系统的自然结构和功能,水质污染问题日益严重,生物栖息地逐渐丧失,这对淡水生物多样性和生态平衡构成了巨大威胁。识别导致水生生物多样性下降的压力源对浑太河流域生态保护与恢复、水资源管理等方面都具有重要意义。本研究通过对浑太河277个采样点的监测,探究不同区域环境压力源对水生生物群落和多样性之间的影响。结果显示:①浑太河采集到着生藻454种、大型底栖动物140种和鱼类47种;②结构方程模型显示,水质指数(waterquality in dex,WQI)对多营养级生物群落α多样性和β多样性的直接影响大于间接影响,且与α多样性显著正相关。此外,WQI通过多营养级生物物种丰度间接对多营养级生物群落α和β多样性产生影响;③从上游到下游随着WQI的增大,多营养级生物群落β多样性在整体上呈增大的趋势。该研究结果可为浑太河流域水生生物群落的保护和管理提供理论依据。展开更多
基金Supported by the National Natural Science Foundation of China(No.32170204)。
文摘This study presents a comprehensive phylogenetic analysis on Batrachospermaceae based on key taxonomic identifiers(rbcL,psaA,psbA,and COI-5P)from some genera.To systematically explore the phylogenetic relationships and taxonomy within Batrachospermaceae,we integrated molecular and morphological data,and explored the phylogeny,character evolution,and ancestral geographical origin and provided a theoretical support for the classification and geographic origination of Batrachospermaceae.Our findings reveal distinct relationships within the phylogenetic tree.Notably,10 genera(Sirodotia,Batrachospermum,Tuomeya,Volatus,Lympha,Nothocladus,Torularia,Sheathia,Nocturama,and Petrohua)are closely associated in the rbcL phylogenetic tree.Additionally,four genera(Kumanoa,Hoefkenia,Notohesperus,and Virescentia)exhibit high support ratios,indicating their close interrelations.Other genera,including Paludicola,Visia,Acarposporophycos,Macrosporophycos,Visioidea,Balliopsis,and Psilosiphon,exhibit clustering traits.Furthermore,the multigene sequences provide a robust support for Montagnia that forms a monophyletic group.Ancestral reconstruction of morphological characters identifies nine primitive character states,including whorl,fascicle length,cortical cells,secondary fascicles,the shape of carpogonical branch,spermatangia,carposporophyte,carpogonium and trichogyne,with Visia likely representing ancestral traits in Batrachospermaceae.Furthermore,geographical origin maps suggest a potential common ancestral of Batrachospermaceae origin in the American continent.Additional to conventional analyses,including evolutionary and ancestral reconstruction investigations into key morphological characters,we attempt to reconstruct the biogeography within the Batrachospermaceae,thus contributing to a nuanced understanding of its origin.
基金Supported by the National Natural Science Foundation of China(No.31970217)the Scientific and Technological Innovation Programs of Higher Education Institution in Shanxi(No.2019L0070)。
文摘Stephanodiscaceae is one of the most diverse family of the freshwater centric diatoms.However,the scarcity of whole plastome data poses a significant challenge to the undertaking of genomic studies on this taxonomic group.We collected data on the plastid genomes from 33 members of the Stephanodiscaceae and its close relatives,including 12 newly-sequenced genomes and 21 deposited in National Center for Biotechnology Information(NCBI).Phylogenetic trees are yielded five major clades based on homologous genes.The features of the plastid genomes,including repeat sequences,codon usage,and selection pressure for each clade,are analyzed.The paper makes a contribution to the field of diatom genomics by describing the structural characteristics of the plastid genomes in the Stephanodiscaceae and its closely related species,complemented by related analyses.It provides crucial data that will serve as indispensable references for future research.
文摘城市化进程中的土地开发、水利工程建设等活动对淡水生态系统造成了不可逆转的损害。这些行为严重破坏了淡水生态系统的自然结构和功能,水质污染问题日益严重,生物栖息地逐渐丧失,这对淡水生物多样性和生态平衡构成了巨大威胁。识别导致水生生物多样性下降的压力源对浑太河流域生态保护与恢复、水资源管理等方面都具有重要意义。本研究通过对浑太河277个采样点的监测,探究不同区域环境压力源对水生生物群落和多样性之间的影响。结果显示:①浑太河采集到着生藻454种、大型底栖动物140种和鱼类47种;②结构方程模型显示,水质指数(waterquality in dex,WQI)对多营养级生物群落α多样性和β多样性的直接影响大于间接影响,且与α多样性显著正相关。此外,WQI通过多营养级生物物种丰度间接对多营养级生物群落α和β多样性产生影响;③从上游到下游随着WQI的增大,多营养级生物群落β多样性在整体上呈增大的趋势。该研究结果可为浑太河流域水生生物群落的保护和管理提供理论依据。
