Shallow population histories in deep evolutionary lineages of marine fishes: Insights from sardines and anchovies and lessons for conservation
Shallow population histories in deep evolutionary lineages of marine fishes: Insights from sardines and anchovies and lessons for conservation
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DOI：
10.1093/jhered/89.5.415
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发表时间：
1998-09-01
影响因子：
3.1
通讯作者：
Bowen, BW
中科院分区：
文献类型：
--
作者：
Grant, WS;Bowen, BW
大多数海洋鱼类线粒体DNA（mtDNA）的调查显示，相对于姐妹类群之间观察到的分化，单倍型之间的序列差异水平较低，目前还不清楚这种模式是否是由于快速的谱系分类加速了抽奖招募，人口规模的历史瓶颈，创始人事件或自然选择，其中任何一个都可能阻碍深层mtDNA谱系的积累。在古气候研究的最新进展提示重新审查海洋学过程的遗传多样性的根本影响;从冰芯和厌氧海洋沉积物的证据文件强烈的制度转变，在世界海洋与周期性的气候变化。这些变化在海面温度，电流路径，上升流强度，并保留漩涡可能预示着严重的波动，在人口规模或区域性的arbitration，沙丁鱼（沙丁鱼，沙丁鱼）和沙丁鱼（Engraulis）被用来评估海洋鱼类属内基因谱系的海洋学过程的后果。这两个群体的代表出现在全球范围内的温带边界流，这些区域人口波动显着。生物地理学和遗传学数据表明，沙丁鱼已经存在了至少2000万年，然而这个群体的mtDNA谱系在不到50万年的时间内就融合在一起，并指出最近在印度洋-太平洋边缘建立了种群。对旧大陆珊瑚的系统地理学分析显示，更新世的珊瑚从太平洋向大西洋扩散，几乎可以肯定是通过南部非洲，随后是最近从欧洲向南部非洲的珊瑚化。这些结果表明，沙丁鱼和沙丁鱼的区域种群受到周期性的迁移和分化，这种与气候相关的动力学可以解释低水平的核苷酸多样性和线粒体DNA谱系的浅聚结。如果这些发现普遍适用于海洋鱼类，管理策略应该包括这样的想法，即使是非常丰富的种群可能是相对脆弱的生态和进化的时间尺度。
Most surveys of mitochondrial DNA (mtDNA) in marine fishes reveal low levels of sequence divergence between haplotypes relative to the differentiation observed between sister taxa, It is unclear whether this pattern is due to rapid lineage sorting accelerated by sweepstakes recruitment, historical bottlenecks in population size, founder events, or natural selection, any of which could retard the accumulation of deep mtDNA lineages. Recent advances in paleoclimate research prompt a reexamination of oceanographic processes as a fundamental influence on genetic diversity; evidence from ice cores and anaerobic marine sediments document strong regime shifts in the world's oceans in concert with periodic climatic changes. These changes in sea surface temperatures, current pathways, upwelling intensities, and retention eddies are likely harbingers of severe fluctuations in population size or regional extinctions, Sardines (Sardina, Sardinops) and anchovies (Engraulis) are used to assess the consequences of such oceanographic processes on marine fish intrageneric gene genealogies. Representatives of these two groups occur in temperate boundary currents on a global scale, and these regional populations are known to fluctuate markedly. Biogeographic and genetic data indicate that Sardinops has persisted for at least 20 million years, yet the mtDNA genealogy for this group coalesces in less than half a million years and points to a recent founding of populations around the rim of the Indian-Pacific Ocean. Phylogeographic analysis of Old World anchovies reveals a Pleistocene dispersal from the Pacific to the Atlantic, almost certainly via southern Africa, followed by a very recent recolonization from Europe to southern Africa. These results demonstrate that regional populations of sardines and anchovies are subject to periodic extinctions and recolonizations, Such climate-associated dynamics may explain the low levels of nucleotide diversity and the shallow coalescence of mtDNA genealogies, If these findings apply generally to marine fishes, management strategies should incorporate the idea that even extremely abundant populations may be relatively fragile on ecological and evolutionary time scales.