摘要
2015年5月,在西藏雅鲁藏布江中游的桑日、朗县段水域开展鱼类调查,发现了1种疑似为拉萨裂腹鱼(Schizothorax waltoni)和异齿裂腹鱼(Schizothorax o’connori)的自然杂交种群体。形态学研究显示,该种的吻、口部、下颌、须等头部上的形态特征居于拉萨裂腹鱼和异齿裂腹鱼之间,并明显区别于双亲,且群体中个体的头部形态稳定一致,均具有典型的中间型特征,个体间没有明显差异。基于线粒体COI基因条形码分析显示,在杂交种群体共15个样本中,有4个与拉萨裂腹鱼为同源,其余11个与异齿裂腹鱼为同源,各自间的亲缘关系很近,即杂交种群体中既有属于拉萨裂腹鱼遗传基因的个体,也有属于异齿裂腹的遗传基因的个体。综合以上研究表明,拉萨裂腹鱼和异齿裂腹鱼在雅鲁藏布江中游的桑日等自然水域中能够自由杂交而产生后代,且两者都可以互为父母本,但以异齿裂腹鱼为母本产生的杂交种在群体中占多数,推测特殊的生态环境可能促使拉萨裂腹鱼和异齿裂腹鱼在自然水域中容易杂交。
In May 2015,a fish species and fishery resources survey was carried out in the middle reaches of the Yarlung Zangbo River in Tibet,and one species suspected to be the natural hybrid of Schizothorax waltoni and S.o’connori was found in the waters of Sangri and Langxian.Morphological analyses showed that the morphological characteristics of the head,including snout,mouth,jaw,and beard length,were in the middle form and distinct from S.waltoni and S.o’connori.The head shape of the individuals in the population was stable and consistent,all with typical intermediate characteristics,and there was no significant difference between individuals.Barcode analysis based on the mitochondrial CO I gene showed that 4 of the 15 samples from the hybrid population were homologous with S.waltoni,the 11 others were homologous with S.o’connori,and the genetic relationship was close to each other.This suggested that individuals with the genotype of S.waltoni and S.o’connori were both present in the suspected hybrid population.In the present study,the results showed that S.waltoni and S.o’connori could hybridize in natural waters to produce offspring.However,the hybrids produced by S.o’connori as the maternal parent were dominant in the population,and it was considered that specific environmental factors in the waters of Sangri could enhance spontaneous inter-species hybridization between S waltoni and S.o’connori.
作者
马波
李雷
王继隆
龚君华
张驰
纪锋
李宝海
MA Bo;LI Lei;WANG Jilong;GONG Junhua;ZHANG Chi;JI Feng;LI Baohai(Heilongjiang River Fisheries Research Institute,Chinese Academy of Fishery Sciences,Harbin 150070,China;Tibet Academy of Agriculture and Animal Husbandry Sciences,Lhasa 850000,China)
出处
《中国水产科学》
CAS
CSCD
北大核心
2018年第4期753-761,共9页
Journal of Fishery Sciences of China
基金
公益性行业(农业)科研专项(201403012)
农业财政专项"西藏重点水域渔业资源与环境调查"
中国水产科学研究院基本科研业务费专项(2014A11)
