Phylogeography of the intertidal copepod Tigriopus californicus reveals substantially reduced population differentiation at northern latitudes
Phylogeography of the intertidal copepod Tigriopus californicus reveals substantially reduced population differentiation at northern latitudes
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DOI：
10.1046/j.0962-1083.2001.01306.x
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发表时间：
2001-07-01
影响因子：
4.9
通讯作者：
Edmands, S
中科院分区：
文献类型：
--
作者：
Edmands, S
先前对潮间带桡足动物加利福尼亚虎足的研究表明，在同种种群中，线粒体DNA分化水平最高。目前的研究将地理采样向北扩展，增加了从加利福尼亚北部到阿拉斯加东南部的种群。基于来自27个种群的49个个体的细胞色素氧化酶I序列，整个物种范围的线粒体系统发育再次显示出种群之间的极端分化（高达23%）。然而，来自俄勒冈州北部的种群似乎是衍生的，种群间的差异比南方种群之间的差异低五倍。此外，虽然每个地方的个体测序很少，但普吉特海湾北部的种群内变异水平显著降低。据推测，这些模式是由最近冰期导致的人口收缩和扩张造成的。
Previous studies of the intertidal copepod Tigriopus californicus revealed one of the highest levels of mitochondrial DNA differentiation ever reported among conspecific populations. The present study extends the geographical sampling northward, adding populations from northern California to south-east Alaska. The mitochondrial phylogeny for the entire species range, based on cytochrome oxidase I sequences for a total of 49 individuals from 27 populations, again shows extreme differentiation among populations (up to 23%). However, populations from Oregon northwards appear to be derived and have interpopulation divergences five times lower than those between southern populations. Furthermore, although few individuals were sequenced from each locality, populations from Puget Sound northward had significantly reduced levels of within-population variation. These patterns are hypothesized to result from the contraction and expansion of populations driven by recent ice ages.