Genome-wide SNPs resolve spatiotemporal patterns of connectivity within striped marlin (Kajikia audax), a broadly distributed and highly migratory pelagic species

Genomic methodologies offer unprecedented opportunities for statistically robust studies of species broadly distributed in environments conducive to high gene flow, providing valuable information for wildlife conservation and management. Here, we sequence restriction site-associated DNA to characterize genome-wide single nucleotide polymorphisms (SNPs) in a broadly distributed and highly migratory large pelagic fish, striped marlin (Kajikia audax). Assessment of over 4,000 SNPs resolved spatiotemporal patterns of genetic connectivity throughout the species range in the Pacific and, for the first time, Indian oceans. Individual-based cluster analyses identified six genetically distinct populations corresponding with the western Indian, eastern Indian, western South Pacific, and eastern central Pacific oceans, as well as two populations in the North Pacific Ocean (FST = 0.0137–0.0819). FST outlier analyses identified a subset of SNPs (n = 59) putatively under the influence of natural sele...

基因组学方法为广泛分布于高基因流适宜环境中的物种开展统计学严谨的研究提供了前所未有的机遇，可为野生动物保护与管理工作提供宝贵参考依据。本研究通过对限制性酶切位点相关DNA（restriction site-associated DNA, RAD）进行测序，以表征一种广泛分布、高度洄游的大型远洋鱼类——条纹马林鱼（Kajikia audax）的全基因组单核苷酸多态性（single nucleotide polymorphisms, SNPs）。针对4000余个单核苷酸多态性位点的分析，阐明了该物种在太平洋及印度洋全域分布范围内的遗传连通性时空分布格局，并首次在印度洋海域完成相关解析。基于个体的聚类分析共鉴定出6个遗传分化显著的种群，分别对应西印度洋、东印度洋、西南太平洋、中东太平洋海域，以及北太平洋的2个种群（固定指数Fixation Index, FST=0.0137–0.0819）。固定指数（Fixation Index, FST）异常位点分析鉴定出59个单核苷酸多态性位点，推测其受自然选择作用...