长江中游湖泊鳜与大眼鳜的渐渗杂交
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现代农业产业技术体系专项(CARS-46)


Hybridization and introgression between Siniperca chuatsi and S. kneri from two lakes in middle Yangtze River
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The modern agricultural industry technology system (CARS-46)

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    摘要:

    在长江中游鄱阳湖和洞庭湖鳜采样中,采集了兼具鳜(Siniperca chuatsi)和大眼鳜(S.kneri)部分形态特征的中间类型(主要特征:口裂后缘伸达眼睛后缘之下,眼睛大小、头后背前部隆起介于鳜与大眼鳜之间)48尾。为了明确中间类型的分类学关系,采用量化传统形态分类指标、筛选种间特异微卫星标记,对中间类型个体进行鉴定分析。结果:(1)量化分析表明,鳜和大眼鳜在头长/眼径、(吻长+眼径)/口裂长上存在显著差异,鳜头长/眼径为5.286~7.157、(吻长+眼径)/口裂长为0.811~0.999,大眼鳜分别为3.306~5.106和1.040~1.166。48尾中间类型中,5尾判定为鳜,其他43尾个体仍不能鉴定。(2)从28对微卫星标记中筛选出5个鳜和大眼鳜的种间鉴别位点(T103、T063、T089、T135、W19517),利用这5个位点对中间类型的个体进行遗传分析和鉴定,中间类型中有16尾为种间杂交后代,其中9尾为杂交F1与大眼鳜的回交个体。长江中游湖泊中鳜和大眼鳜存在种间渐渗杂交,今后需加强长江鳜鱼野生资源遗传监测和管理。

    Abstract:

    In sampling of Siniperca fishes from Poyang Lake and Dongting Lake in the middle Yangtze River, 48 intermediate individuals with partial morphological features of S. chuatsi and S. kneri (Main feature:The posterior edge of the cleft mouth is below the posterior edge of the eye, the eye size and the anterior ridge of head are between the S. chuatsi and S. kneri) were collected. In order to clarify their taxonomic relationship, the quantitative morphological parameters and species-specific microsatellite loci were screened for identification. Results showed:(1) there was significant difference in head length/eye diameter and (snout length+eye diameter)/fissure length between S. chuatsi and S. kneri. Head length/eye diameter in S. chuatsi is from 5.286 to 7.157, (snout length+eye diameter)/fissure length is from 0.811 to 0.999, they are from 3.306 to 5.106 and 1.040 to 1.166 in S. kneri, respectively. Among 48 intermediate individuals, 5 individuals were identified as S. chuatsi, and the remaining 43 individuals were still unable to be identified. (2) Five speices-specific loci (T103, T063, T089, T135, W19517) were screened from 28 pairs of microsatellite markers. In genetic analysis and identification of intermediate types of individuals using these five loci, 16 were inter-species hybrid progeny, and 9 of them were identified as backcross progeny (F1×SK). The results indicated that inter-species introgressive hybridization between S. chuatsi and S. kneri existed in the middle Yangtze River, and it is necessary to strengthen genetic monitoring and management of mandarin fish resources in the Yangtze River.

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朱书琴,曹晓颖,赵金良,唐首杰,吴红岩.长江中游湖泊鳜与大眼鳜的渐渗杂交[J].上海海洋大学学报,2020,29(1):1-8.
ZHU Shuqin, CAO Xiaoying, ZHAO Jinliang, TANG Shoujie, WU Hongyan. Hybridization and introgression between Siniperca chuatsi and S. kneri from two lakes in middle Yangtze River[J]. Journal of Shanghai Ocean University,2020,29(1):1-8.

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  • 收稿日期:2019-04-22
  • 最后修改日期:2019-05-19
  • 录用日期:2019-08-29
  • 在线发布日期: 2020-01-14
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