Taxonomic appraisal of Melosira arctica Dickie and description of a new variety (Bacillariophyta)
Taxonomic appraisal of Melosira arctica Dickie and description of a new variety (Bacillariophyta)
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Melosira arctica Dickie 的分类学鉴定和新品种（硅藻门）的描述
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
R. Jahn
中科院分区：
文献类型：
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作者：
I. Kaczmarska;R. Jahn
摘要对北极直链藻的原材料进行了研究。物种界限的修订，包括详细的硅藻壳的精细结构，并首次，从原始材料的人口的基本形态计量学已建立使用光学和电子显微镜。这个最初的种群，收集于1850年，被与这个分类群的三个当代种群进行了比较，收集于北纬71°至76°，西经77°至173°的北冰洋站。经形态计量学观察，发现一新变种M.北极湾Krembsii，建议。新变种与命名变种的区别在于瓣柄的穿孔较细，在外套膜边缘以上10 μm处的边缘裂孔较少，瓣面上的裂孔较少，以及瓣的条纹较细。根据已发表的插图，我们建议M。北极湾krembsii可能在70° N以南的纬度更常见，而命名品种则出现在更极地的海洋。
Abstract Original material of Melosira arctica was examined. Species circumscription is emended to include detailed frustule fine structure and, for the first time, the basic morphometrics of the population from original material have been established using light and electron microscopy. This original population, collected in 1850, was compared to three contemporary populations of this taxon, collected at Arctic Ocean stations ranging from latitude of 71° to 76° N and from longitude 77° to 173° W. As a result of morphometric examination, a new variety, M. arctica var. krembsii, is proposed. The new variety differs from the nominate variety by finer perforation of the valvocopulae, by fewer marginal rimoportulae in 10 μm located further above the mantle margin, by fewer rimoportulae on the valve face, and by finer striation of the valves. Based on published illustrations, we suggest that M. arctica var. krembsii may be more common at latitudes south of 70° N, while the nominate variety occurs in more polar seas.