Comparative phylogeography of coastal limpets across a marine disjunction in New Zealand
Comparative phylogeography of coastal limpets across a marine disjunction in New Zealand
复制标题
DOI：
10.1111/j.1365-294x.2006.02977.x
复制
发表时间：
2006-10-01
影响因子：
4.9
通讯作者：
Gemmell, Neil J.
中科院分区：
文献类型：
--
作者：
Goldstien, Sharyn J.;Schiel, David R.;Gemmell, Neil J.
库克海峡是新西兰南北岛的分界线，在整个更新世，库克海峡是新西兰陆地的一个短暂的、但又重新出现的特征，在过去的5000年里一直保持着它目前的宽度和深度。历史上的土地分割加上大库克海峡地区复杂的水文地理，在几个海洋物种中造成了南岛和北岛之间的地理和地理分离。在这里，我们使用线粒体细胞色素bDNA序列的三个地方性潮间带帽贝，Cellana ornata，Cellana radians和Cellana flava评估种内分布的地理格局横跨库克海峡，并寻找种间的一致性密切相关的类群之间的生态和进化过程。我们对来自8-31个种群的85-321个个体进行了328-359 bp的测序，这些个体跨越了这三个物种的地理范围。种内遗传地理分析表明，由于异域破碎化，北岛和南岛种群之间存在中度到强烈的遗传不连续性。这一模式在三个物种之间是广泛一致的，并且在这组潮间带帽贝（0.3-2.0%）中观察到的分歧与先前研究的潮下带生物相似。对于每一个物种，分歧时间计算表明当代北岛和南岛血统从他们各自最近的共同祖先分歧约20万至30万年前（BP），显着早于以前的估计，在其他沿海海洋类群所产生的分歧时间的错误计算。
Cook Strait, which separates the North and South Island of New Zealand, has been a transient, but re-occurring feature of the New Zealand land mass throughout the Pleistocene, maintaining its current width and depth for the past 5000 years. Historic land fragmentation coupled with the complex hydrography of the Greater Cook Strait region has created both biogeographic and phylogeographic disjunctions between the North and South Island in several marine species. Here we use mitochondrial cytochrome bDNA sequences of three endemic intertidal limpets, Cellana ornata, Cellana radians and Cellana flava to assess intraspecific phylogeographic patterns across Cook Strait and to look for interspecific concordance of ecological and evolutionary processes among closely related taxa. We sequenced 328-359 bp in 85-321 individuals from 8-31 populations spanning the biogeographic range of the three species. Intraspecific phylogeographic analyses show moderate to strong genetic discontinuity among North and South Island populations due to allopatric fragmentation. This pattern was broadly concordant across the three species and the observed divergence among this group of intertidal limpets (0.3-2.0%) is similar to that of previously studied subtidal organisms. For each species, divergence time calculations suggest contemporary North and South Island lineages diverged from their respective most recent common ancestor approximately 200 000 to 300 000 years before present (BP), significantly earlier than previous estimates in other coastal marine taxa that arose from a miscalculation of divergence time.