Population differentiation and species formation in the deep sea: the potential role of environmental gradients and depth.
Population differentiation and species formation in the deep sea: the potential role of environmental gradients and depth.
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DOI：
10.1371/journal.pone.0077594
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Ficarra L
中科院分区：
文献类型：
--
作者：
Jennings RM;Etter RJ;Ficarra L
生态物种形成可能在多样化中发挥的作用比以前认为的更为突出，特别是在海洋生态系统中，那里的扩散潜力很大，基因流动几乎没有明显的障碍。在深海中尤其如此，在那里异域物种的形成似乎不足以解释丰富而主要是特有的动物群。生态驱动的种群分化和物种形成可能在环境梯度上最为普遍，例如那些参与深度变化的梯度。我们量化了北大西洋西部原枝双壳类（Nuculaatacellana）沿深度梯度（1600-3800m）的遗传变异模式，以测试种群分化。多位点分析表明，在狭窄的深度范围内存在明显的不连续性，在数千代的浅层种群和深层种群之间推断出极低的基因流量。在物种形成的早期阶段，核位点和线粒体位点之间发生了系统地理上的不一致。由于该地区不同种群之间的地理距离较小，且不存在明显的扩散障碍，我们认为这种差异可能反映了生态驱动的选择，而环境相关因素介导了深度梯度。对许多浅水物种来说，平行于深度变化的环境梯度可能在深水动物群的发生和适应性辐射中起关键作用。
Ecological speciation probably plays a more prominent role in diversification than previously thought, particularly in marine ecosystems where dispersal potential is great and where few obvious barriers to gene flow exist. This may be especially true in the deep sea where allopatric speciation seems insufficient to account for the rich and largely endemic fauna. Ecologically driven population differentiation and speciation are likely to be most prevalent along environmental gradients, such as those attending changes in depth. We quantified patterns of genetic variation along a depth gradient (1600-3800m) in the western North Atlantic for a protobranch bivalve ( Nuculaatacellana ) to test for population divergence. Multilocus analyses indicated a sharp discontinuity across a narrow depth range, with extremely low gene flow inferred between shallow and deep populations for thousands of generations. Phylogeographical discordance occurred between nuclear and mitochondrial loci as might be expected during the early stages of species formation. Because the geographic distance between divergent populations is small and no obvious dispersal barriers exist in this region, we suggest the divergence might reflect ecologically driven selection mediated by environmental correlates of the depth gradient. As inferred for numerous shallow-water species, environmental gradients that parallel changes in depth may play a key role in the genesis and adaptive radiation of the deep-water fauna.
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影响因子：
4.9
作者：
Baird, Helena P.;Miller, Karen J.;Stark, Jonathan S.
通讯作者：
Stark, Jonathan S.
影响因子：
3.3
作者：
Benzie, JAH;Williams, ST
通讯作者：
Williams, ST
影响因子：
4.9
作者：
Bulgarella, Mariana;Peters, Jeffrey L.;McCracken, Kevin G.
通讯作者：
McCracken, Kevin G.
影响因子：
4.8
作者：
Burgess, Malcolm D.;Nicoll, Malcolm A. C.;Norris, Ken
通讯作者：
Norris, Ken
DOI：
10.1111/j.1439-0485.2010.00395.x
发表时间：
2010-09-01
影响因子：
1.1
作者：
Cho, Walter;Shank, Timothy M.
通讯作者：
Shank, Timothy M.