Fine-scale seascape genomics of an exploited marine species, the common cockle Cerastoderma edule, using a multi-modelling approach

Population dynamics of marine species that are sessile as adults are driven by oceanographic dispersal of larvae from spawning to nursery grounds. This is mediated by life-history traits such as the timing and frequency of spawning, larval behaviour and duration, and settlement success. Here, we use 1725 single nucleotide polymorphisms (SNPs) to study the fine scale spatial genetic structure in the commercially important cockle species Cerastoderma edule and compare it to environmental variables and current-mediated larval dispersal within a modelling framework. Hydrodynamic modelling employing the NEMO Atlantic Margin Model (AMM15) was used to simulate larval transport and estimate connectivity between populations during spawning months (April - September), factoring in larval duration and inter-annual variability of ocean currents. Results at neutral loci reveal the existence of three separate genetic clusters (mean FST=0.021) within a relatively fine spatial scale in the northwest At...

成体营固着生活的海洋物种，其种群动态由幼体从产卵场至育苗场的海洋学扩散过程主导。该过程受产卵时机与频次、幼体行为及发育时长、定居成功率等生活史性状所调控。本研究利用1725个单核苷酸多态性（single nucleotide polymorphisms, SNPs）位点，针对具有重要商业价值的食用鸟蛤（Cerastoderma edule）开展精细空间遗传结构分析，并在建模框架下将其与环境变量及洋流介导的幼体扩散模式进行对比。研究采用NEMO大西洋边缘模型（AMM15）构建水动力模拟方案，以复现幼体输运过程，同时纳入幼体发育时长与洋流年际变异性的影响因素，估算产卵期（4月至9月）内各种群间的连通性。中性位点的分析结果显示，在西北大西洋相对精细的空间尺度内，存在三个独立的遗传聚类（平均FST=0.021），相关研究暂未完整呈现。