摘要
洞鳅属(Troglonectes Zhang,Zhao&Tang 2016)鱼类为中国特有的小型洞穴淡水鱼类,主要分布在贵州和广西喀斯特地区的地下河流中。2018至2019年在贵州省荔波县境内进行洞穴生物多样性调查时采集到4号洞鳅属标本,经过形态比较,与弱须洞鳅(Troglonectes barbatus)相似;基于线粒体16S rRNA和Cyt b重建的系统发育树及遗传距离分析显示,4号洞鳅属标本与来自模式产地的弱须洞鳅高度支持聚为一支;利用Kimura双参数模型计算基于16S rRNA和Cyt b的遗传距离,这些标本与弱须洞鳅之间的遗传距离分别为0.4%和0.2%,小于洞鳅属物种之间的遗传距离(16S rRNA遗传距离为2.4%,Cyt b遗传距离为6.1%)。本次研究使用16S rRNA和Cyt b分子标记研究洞鳅属部分物种的系统发育关系和遗传距离。综合形态和分子系统发育分析结果,确定采集自贵州省荔波县小七孔景区的4号标本为隶属于鲤形目条鳅科洞鳅属的弱须洞鳅,系贵州省洞穴鱼类新记录种。
Troglonectes Zhang,Zhao&Tang 2016 fish included 10 species,all were small cave freshwater fish endemic to China,original records showed that most species(7 species)distributed in underground rivers in the Karst areas of Guangxi,few species(3 species)recorded in Guizhou Province,China.Four loach specimens of genus Troglonectes were collected during cave biodiversity survey from 2018 to 2019 within Xiaoqikong scenic area,Libo County,Guizhou Province,China(Table 1).Through the morphological comparison,it was found that similar to T.barbatus(Table 3),the key morphological taxonomic characteristics showed the same,such as:dorsal fin rays,pelvic fin rays and caudal fin rays;phylogenetic tree analysis and genetic distance analysis based on the mitochondrial 16S rRNA and Cyt b reconstruction showed that four specimens were clustered into a highly supported clade with T.barbatus from the type locality(Fig.2);genetic distances of 16S rRNA and Cyt b calculated based on Kimura 2-parameter showed that the genetic distances between these specimens and T.barbatus were 0.4%and 0.2%,respectively,which were much smaller than those congeners of genus Troglonectes(genetic distances of 16S rRNA was 2.4%,and Cyt b was 6.1%)(Table 2).In this study,16S rRNA and Cyt b molecular markers were used to study the phylogenetic relationship and genetic distances of genus Troglonectes.The comprehensive morphological and phylogenetic analyses indicated that four specimens were belonged to the weakly bearded cave loach of the genus Troglonectes Loach,family Carabidae,new distribution record of Troglonectes fishes in Guizhou Province.
作者
彭东
王亚丽
杨旭
肖宁
PENG Dong;DWANG Ya-Li;YANG Xu;XIAO Ning(School of Life Sciences.Guizhou Normal University,Guiyang 550001;Guiyang Nursing Vocational College,Guiyang550081,China)
出处
《动物学杂志》
CAS
CSCD
北大核心
2021年第6期882-890,共9页
Chinese Journal of Zoology
基金
中国科学院B类战略性先导科技专项(No.XDB31030108)
荔波世界自然遗产地生物多样性监测项目,国家动物标本资源库项目(No.2005DKA21402)。
关键词
弱须洞鳅
洞穴鱼类
分布新记录种
贵州
Troglonectes barbatus
Cave fish
New distribution record
Guizhou
