中国海剑尖枪乌贼种群遗传结构、迁移模式和分化机制研究

Swordtip squid, Uroteuthis edulis, is a valuable commercially exploited species along the coast of China. The fisheries resource sustainable utility is facing the biggest challenge duo to the ever-increasing catching-intensive since 1990s. Ever-changing ocean environments, complex migration pattern and life-stage character make the investigation of population structure and a variety of morphological forms complicated. Population division along the coast of China will be investigated using morphological approach, mtDNA and microsatellite loci. We will assess the genetic structure and variation, gene flow, population admixtures and gene introgression. The effective size will be deduced. The questions that how the life history pattern, current ocean hydrography and ever-increasing anthropogenic disruption will impact the dispersal pattern, gene flow and effective population size of the species will be investigated. An understanding of genetic variability should provide an important basis for the management and the mechanism of self-recruitment of the species as an important fisheries resource.

剑尖枪乌贼（Uroteuthis edulis）是我国沿海重要的渔业资源，上个世纪90年代以来随着捕捞强度的不断增大，个体小型化迅速，资源持续利用面临压力。海洋环境的不断变化、复杂的迁移模式和生活史特征，形成了剑尖枪乌贼复杂的种群结构和多变的生态型。本项目拟采用mtDNA细胞色素氧化酶（COI）基因片段和微卫星DNA标记研究剑尖枪乌贼的遗传多样性、基因流、混合种群和基因渗透现象，推断种群的有效群体大小，探索历史上海洋环境的变迁和近期海洋水文变化和人为因素对中国海剑尖枪乌贼迁移模式、有效种群大小的影响，探讨种群分化机制，系统全面的研究其遗传背景。预期研究结果不仅可以为我国剑尖枪乌贼资源的有效保护和管理提供理论依据，而且对于枪乌贼科种类遗传进化具有重要的理论和实践意义。