Global diversity and biogeography of Skeletonema species (Bacillariophyta)
Global diversity and biogeography of Skeletonema species (Bacillariophyta)
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DOI：
10.1016/j.protis.2007.09.004
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发表时间：
2008-04-01
期刊：
影响因子：
2.5
通讯作者：
Zingone, Adriana
中科院分区：
文献类型：
--
作者：
Kooistra, Wiebe H. C. F.;Sarno, Diana;Zingone, Adriana
最近的研究表明，世界性硅藻中肋骨条藻广义上是由几个形态和遗传上不同的物种。为了评估不同的物种是否具有世界性的分布，我们分析了来自世界各地的海洋和河口站点的184株。我们使用光学和电子显微镜鉴定菌株，并对核LSU rDNA的高变区进行测序。所有最近描述的物种在遗传上都是不同的，除了两个之外，所有的物种在形态上都是不同的。用于区分杜氏双丝藻和S. marinoi，其不能仅基于形态学鉴定。此外，多个遗传上不同的分类群，这可能是潜在的物种，被发现在S。menzelii和S.热带枝。我们发现，所有目前公认的种的speaketonema是广泛的，但是，差距似乎发生在他们的地理范围。例如，有些物种在北方和南方温带都有发现，而另一些物种似乎只分布在亚热带到热带地区。假中肋骨条藻和S. grethae似乎有更有限的地理范围，因为前者没有发现沿着美国海岸和后者只遇到在美国沃茨。提供了一个分类学更新目前可在几个培养物收藏，这可能有助于重新解释使用这些菌株的比较研究中获得的结果。(c)2007年，Elsevier GmbH。All rights reserved.
Recent studies have shown that the cosmopolitan diatom Skeletonema costatum sensu lato is composed of several morphologically and genetically distinct species. To assess whether the separate species have a cosmopolitan distribution, we analysed 184 strains from marine and estuarine sites worldwide. We identified the strains using light and electron microscopy, and we sequenced the hyper-variable region of nuclear LSU rDNA. All recently described species were genetically distinct, and all but two were morphologically distinct. Variability was found for the only ultrastructural character used to distinguish Skeletonema dohrnii and S. marinoi, which cannot be identified based on morphology alone. Furthermore, multiple genetically distinct taxa, which may represent cryptic species, were found within the S. menzelii and S. tropicum clades. We found that all currently recognized species of Skeletonema are widespread, however, gaps seem to occur in their geographical ranges. For example, some species are found in both the northern and southern temperate latitudes whereas other species appear to have only subtropical to tropical ranges. Skeletonema pseudocostatum and S. grethae seem to have more restricted geographical ranges because the former was not found along American coasts and the latter was encountered only in US waters. A taxonomic update is provided for Skeletonema strains currently available in several culture collections, which could aid reinterpretation of results obtained in comparative studies using these strains. (c) 2007 Elsevier GmbH. All rights reserved.