Systematics of Chaetocerotaceae (Bacillariophyceae). I. A phylogenetic analysis of the family
Systematics of Chaetocerotaceae (Bacillariophyceae). I. A phylogenetic analysis of the family
复制标题
角毛藻科（Bacillariophyceae）的系统学。
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
E. Theriot
中科院分区：
文献类型：
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作者：
J. Rines;E. Theriot
为了构建硅藻科内的进化关系模型，对代表该属所有亚属和 22 个亚属部分中的 21 个的 37 种 Chaetoceros Ehrenberg 物种，以及代表其两个亚属部分的 3 个 Bacteriastrum Shadbolt 物种进行了分支分析。 Eucampia Ehrenberg、Cerataulina Peragallo、Hemiau‐lus Ehrenberg、Attheya West 和 Gonioceros H. & M. Peragallo 各一种作为外群。构建了 65 个二元和多态形态特征的矩阵，数据是通过光学和电子显微镜对材料的原始观察以及已发表的文献收集的。分析产生了 36 个最简约的分支图，共 316 个步骤；树木之间的不一致主要限于代表角毛藻亚群的采样不足部分的一些类群。玻璃藻门。通过多种方式检验了这一假设的稳健性。为了评估字符加权的效果，使用引导程序对字符进行随机加权。通过衰减指数放宽简约标准，最后，将树长度与从数据矩阵随机生成的树长度进行比较。大多数被调查的角毛藻亚属物种。角毛藻属，角毛藻亚属。 Hyalocaete 和 Bacteriastrum 似乎属于一个连续的等级，而不是由单独的进化枝组成。角毛藻是并系的。因此，传统的分类不能准确反映该科假设的系统发育关系。
In order to construct a model of evolutionary relationships within the diatom family Chaetocerotaceae, 37 species of Chaetoceros Ehrenberg, representing all subgenera and 21 of 22 subgeneric sections of the genus, plus three Bacteriastrum Shadbolt species, representing both of its subgeneric sections, were subjected to cladistic analysis. One species each of Eucampia Ehrenberg, Cerataulina Peragallo, Hemiau‐lus Ehrenberg, Attheya West and Gonioceros H. & M. Peragallo were used as outgroups. A matrix of 65 binary and multistate morphological characters was constructed, with data being gathered from original observation of material in the light and electron microscopes, and from the published literature. The analysis yielded 36 most‐parsimonious cladograms of 316 steps; incongruence between trees is largely restricted to some taxa representing undersampled sections of Chaetoceros subg. Hyalochaete. The robustness of this hypothesis was examined in several ways. To assess the effect of character weighting, the bootstrap was used to randomly weight characters. The parsimony criterion was relaxed via a decay index, and finally, the tree length was compared to that of trees randomly generated from the data matrix. The majority of investigated species of Chaetoceros subg. Phaeoceros, Chaetoceros subg. Hyalochaete and Bacteriastrum appear to belong to a continuous grade, rather than comprising individual clades. Chaetoceros is paraphyletic. Thus, the traditional classification does not accurately reflect the hypothesized phylogenetic relationships of this family.