Gomphosphenia biwaensis, a new diatom from Lake Biwa, Japan: description and morphometric comparison with similar species using an arc-constitutive model
Gomphosphenia biwaensis, a new diatom from Lake Biwa, Japan: description and morphometric comparison with similar species using an arc-constitutive model
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Gomphosphenia biwaensis，日本琵琶湖的一种新硅藻：使用弧本构模型进行描述和与相似物种的形态测量比较
DOI：
10.1080/0269249x.2018.1433237
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发表时间：
2018
期刊：
影响因子：
1.8
通讯作者：
Nakai Daisuke
中科院分区：
文献类型：
--
作者：
Ohtsuka Taisuke;Kitano Daisuque;Nakai Daisuke
本文记述了日本中部琵琶湖南部盆地的一种硅藻新种--琵琶湖球磷藻（Gomphosphenia biwaensisOhtsuka & D.Nakai）。扫描电子显微镜显示，该物种的精细结构是典型的属Gomphosphenia，虽然条纹是由一些晕不像Gomphosphenia lingulatiformis，属的模式种。基于100多个样本的光学显微照片，在可以近似为弧的范围内测量这些样本的头极、足极和每个瓣膜侧的半径，以及瓣膜长度、宽度和条纹密度。采用基于相关系数的主成分分析对形态测量数据进行对数转换和正交化，并消除第一个主成分以消除尺寸差异的影响。第二个和随后的主成分近似遵循多元正态分布。其他样本的形态测量数据大多落入99%置信度的椭圆柱内，而其他由多个晕轮组成的Gomphpheniasspecies的形态测量数据均被排除在外。biwaensisis为Gomphosphenia一新种。这是一个丰富的附生植物上Lyngbya wollei，底栖丝状蓝藻，其中栖息在琵琶湖的南部盆地。然而，L. wollei似乎不是最初的宿主，因为它可能是自2012年以来迅速增加的琵琶湖外来物种，而G. 2000年在那里采集的样本中也含有biwaensis。
A new diatom speciesGomphosphenia biwaensisOhtsuka & D.Nakai was described from the south basin of Lake Biwa in Central Japan. Scanning electron microscopy revealed that the fine structure of this species is typical of the genusGomphosphenia, although the striae are composed of a few areolae unlikeGomphosphenia lingulatiformis, the type species of the genus. Based on light micrographs of more than 100 specimens, the radii of the head pole, foot pole, and each valve side of these specimens were measured within a range that can be approximated by an arc, as well as the valve length, width, and stria density. The morphometric data were log-transformed and orthogonalized using principal component analysis based on the correlation coefficient, and the first principal component was eliminated to remove the effect of size differences. The second and subsequent principal components approximately followed a multivariate normal distribution. Morphometric data of the specimens from the other samples from Lake Biwa and its satellite lakes mostly fell into the 99% confident ellipsoidal cylinder, whereas those of the otherGomphospheniaspecies, whose striae are composed of multiple areolae, were all excluded from it. We therefore concluded thatG. biwaensisis a new species ofGomphosphenia. It was an abundant epiphyte onLyngbya wollei, a benthic filamentous cyanobacterium, which flourishes in Lake Biwa's south basin. However,L. wolleiseems to not be the original host because it is probably an exotic species to Lake Biwa that has rapidly increased since 2012, whileG. biwaensiswas also present in samples collected there in 2000.