He Lijun, Mukai Takahiko, Hou Chu Ka, Ma Qiang, Zhang Jing
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 200062, Shanghai, China.
East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 200090, Shanghai, China.
Sci Rep. 2015 Oct 28;5:15645. doi: 10.1038/srep15645.
Quaternary climatic cycles have influenced marine organisms' spatial distribution and population dynamics. This study aimed to elucidate the evolutionary influences of contemporary and glacial physical barriers on the population structure, demography and colonization history of the mudskipper (Periophthalmus modestus) based on a mitochondrial gene segment (ND5) from 131 individual fish sampled in the northwestern Pacific Ocean. The current Kuroshio Current and the glacial exposure of the Taiwan Strait appeared to have restricted migration among the South China Sea, coastal East China and Japan. However, genetic homogeneity (Nm>1) also suggested contemporary larval transportation by sea circulation between the East China Sea and the South China Sea or historical dispersal along the glacial exposed shoreline among China, Japan and the Ryukyu Islands. Evolutionary signals of the strengthened East Asian Summer Monsoon in the mid-Pleistocene and regional difference in intertidal primary productions were indicated by a late-Pleistocene population expansion of P. modestus with a higher effective population size in the South China Sea than in the East China Sea. Furthermore, a potential colonization origin from the South China Sea was consistently inferred by different clues, including the populations' coalescence times, the ancestral haplotype distribution, the number of private haplotypes and species/genetic diversity.
第四纪气候周期影响了海洋生物的空间分布和种群动态。本研究旨在基于从西北太平洋采集的131条弹涂鱼（Periophthalmus modestus）个体的线粒体基因片段（ND5），阐明当代和冰川期物理屏障对弹涂鱼种群结构、种群统计学和定殖历史的进化影响。当前的黑潮以及台湾海峡在冰川期的出露似乎限制了南海、中国东部沿海和日本之间的洄游。然而，基因同质性（Nm>1）也表明，当代存在通过海流在东海和南海之间进行的幼体运输，或者历史上沿着冰川期出露的海岸线在中国、日本和琉球群岛之间的扩散。更新世中期东亚夏季风增强的进化信号以及潮间带初级生产力的区域差异，表现为更新世晚期弹涂鱼种群扩张，南海的有效种群规模高于东海。此外，通过不同线索，包括种群的溯祖时间、祖先单倍型分布、私有单倍型数量以及物种/遗传多样性，一致推断出南海可能是定殖起源地。
