SNP panels genotyping data for the genetic characterization of cupped oyster resources in Europe

the pacific oyster, crassostrea gigas, has been voluntarily introduced from japan and british columbia into europe in the early 1970s, mainly to replace the portuguese oyster, crassostrea angulata, in the french shellfish industry following a severe disease outbreak. since then, the two species are in contact in southern europe and therefore have the potential to exchange genes in a new environment. whether c. gigas and c. angulata truly represent biological species, semi-isolated species of populations of the same species has been largely discussed. this has been recently clarified by a genome-wide approach providing empirical evidence for highly heterogeneous divergence patterns across the genome, attributed to reduced introgression in low-recombining regions since secondary contact. up to now only one mitochondrial and one nuclear marker have been used to differentiate c. gigas and c. angulata. here, we selected a subset of ancestry informative makers from existing genomic resources in order to (1) easily differentiate c. gigas and c. angulata, and (2) describe the genetic diversity and structure of the cupped oyster with a particular focus on french atlantic coasts. in this context several datasets were produced using 15 to 80 snp markers.

太平洋牡蛎（Crassostrea gigas），自20世纪70年代初由日本及不列颠哥伦比亚自愿引入欧洲，主要目的是替代因严重疾病爆发而受损的葡萄牙牡蛎（Crassostrea angulata），以复兴法国的贝类产业。自那时起，这两种物种在欧洲南部地区接触，从而在新的环境中具有基因交流的潜力。关于C. gigas与C. angulata是否真正代表生物学上的物种，或是同一物种的半隔离种群，这一问题已广受热议。近期，通过全基因组分析方法已对此问题进行了明确，该分析提供了基因组中高度异质分化模式的经验证据，这些模式归因于次级接触后的低重组区域中遗传入侵的减少。迄今为止，仅使用了一种线粒体标记和一种核标记来区分C. gigas与C. angulata。在本研究中，我们选取了来自现有基因组资源中的祖先信息标记子集，旨在（1）轻松区分C. gigas与C. angulata，以及（2）描述褶牡蛎的遗传多样性和结构，特别是聚焦于法国大西洋沿岸。在此背景下，利用15至80个SNP标记生成了多个数据集。