Phylogeography of the sardines (Sardinops spp): Assessing biogeographic models and population histories in temperate upwelling zones
Phylogeography of the sardines (Sardinops spp): Assessing biogeographic models and population histories in temperate upwelling zones
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DOI：
10.1111/j.1558-5646.1997.tb01483.x
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发表时间：
1997-10-01
期刊：
影响因子：
3.3
通讯作者：
Grant, WS
中科院分区：
文献类型：
--
作者：
Bowen, BW;Grant, WS
沙丁鱼（沙丁鱼属）分布于印度洋和太平洋沿岸的温带上升流区，包括日本、加州、智利、澳大利亚和南非。东太平洋和西太平洋的种群被广阔的公海隔开，北方和南半球的种群被对沙丁鱼来说是致命的热带沃茨隔开。这些障碍的相对重要性一直是地理学中的替代学派和分散学派之间长期争论的焦点。线粒体（MT）DNA控制区的500 bp片段的比较显示强大的地理结构的mtDNA谱系，但浅的分歧内和区域人群之间。区域人口是相互关联的踏脚石模式，一系列更新世的印度-太平洋盆地的大陆边缘周围的扩散事件的明显结果。这些mtDNA数据，结合34个核位点的电泳变异调查（Grant和Leslie 1996），表明沙丁鱼的五个区域类型（被大多数权威认为是独立的分类群）可能在50万年前分化，这比基于板块构造的地理变异模型预测的时间要短得多。高mtDNA单倍型多样性，再加上蛋白质电泳数据集中的稀有等位基因过多，可能表明从一个小的祖先群体的指数增长。线粒体DNA和等位酶的数据是一致的气候记录和化石证据描绘区域人口最近，不稳定，短暂的。沙丁鱼的区域种群可能已经灭绝，并在短的进化时间尺度上，沿海涌升带的气候和海洋学的变化作出反应。
Sardines (Sardinops spp.) occupy temperate upwelling zones in the coastal regions of the Indian and Pacific Oceans, including locations in Japan, California, Chile, Australia, and South Africa. East and West Pacific populations are separated by vast expanses of open ocean, and northern and southern hemisphere populations are separated by tropical waters which are lethal to sardines. The relative importance of these barriers has been the focus of a longstanding debate between vicariance and dispersal schools in biogeography. Comparisons of a 500 bp fragment of the mitochondrial (mt) DNA control region reveal strong geographic structuring of mtDNA lineages but shallow divergence both within and between regional populations. Regional populations are related to one another in a stepping-stone pattern, the apparent result of a series of Pleistocene dispersal events around the continental margins of the Indian-Pacific Basin. These mtDNA data, combined with an electrophoretic survey of variability at 34 nuclear loci (Grant and Leslie 1996), indicate that the five regional forms of Sardinops (considered separate taxa by most authorities) probably diverged within 500,000 years BP, a much shorter timeframe than predicted by vicariance models based on plate tectonics. High mtDNA haplotype diversity, coupled with an excess of rare alleles in the protein electrophoretic dataset, may indicate exponential growth from a small ancestral population. The mtDNA and allozyme data are concordant with climate records and fossil evidence in portraying regional populations as recent, unstable, and ephemeral. Regional populations of sardines have probably been extinguished and recolonized over short evolutionary timescales in response to changes in climate and the oceanography of coastal upwelling zones.