Measurements of cnidae from sea anemones (Cnidaria: Actiniaria), III: ranges and other measures of statistical dispersion, their interrelations and taxonomic relevance*
Measurements of cnidae from sea anemones (Cnidaria: Actiniaria), III: ranges and other measures of statistical dispersion, their interrelations and taxonomic relevance*
复制标题
海葵中刺胞动物的测量（刺胞动物门：海葵），III：统计分散度的范围和其他测量方法、它们的相互关系和分类学相关性*
DOI：
10.3989/scimar.2000.64n149
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
R. Williams
中科院分区：
文献类型：
--
作者：
R. Williams
这是一系列论文的第三篇，研究海葵（Actiniaria）的cnidae测量的一些统计处理的分类学相关性。对来自Nematostella vectensis、Haliplanella lineata、Sagartia elegans、Metridium senile、Cereus pedunculatus、Sagartia troglodytes、Anthopleura thallia、Urticina eques和Sagartiogeton lacerates的新鲜组织样品（柱状外胚层、触角或乌头）的一些刺胞体长度进行了测量。统计离散度（样本标准差，变异系数，观察到的样本范围，标准范围，和99%可能的最大值的标准范围）的五个措施进行了计算，并评估其相互关系和潜在的应用。长期以来，惯例是使用组织样品中最大和最小的刺胞大小（观察到的样品范围）来试图建立海鞘分类群之间的差异。然而，这些数据并不反映人口范围的真正极端情况。在本研究中，标准丰度为1，000的标准范围的99%可能最大值给出了一个物种的刺胞纲大小的种群范围的最大和最谨慎的估计。这个最大的标准范围是唯一的衡量分散的刺胞体大小，可以有效地用来证明海葵标本是不同的物种，然后只有当有没有重叠的极端刺胞体大小进行比较。然而，部分或完全重叠的刺胞纲大小的极端不一定表明标本是同种的，其他分类特征也必须考虑。变异系数可以提供有价值的线索，同质性或异质性的样品刺胞动物的测量。这篇文章应该与本系列的前两篇文章一起阅读，这两篇文章讨论了刺胞类平均大小之间差异的分类学相关性（威廉姆斯，1996，科学。三月，60：339-351; 1998，Sci.三月，62：361-372）。
This is the third of a series of papers examining the taxonomic relevance of some statistical treatments of measurements of cnidae from sea anemones (Actiniaria). Some cnida lengths from fresh tissue samples (column ectoderm, tentacles or acontia) from Nematostella vectensis, Haliplanella lineata, Sagartia elegans, Metridium senile, Cereus pedunculatus, Sagartia troglodytes, Anthopleura thallia, Urticina eques and Sagartiogeton lacerates were measured. Five measures of statistical dispersion (sample standard deviation, coefficient of variation, observed sample range, standard range, and 99% probable maximum value of the standard range) were calculated, and their interrelations and potential applications were appraised. It has long been the convention to use the largest and smallest cnida sizes (observed sample range) from tissue samples in attempts to establish differences between actiniarian taxa. However, such data do not reflect the true extremes of a population range. In the present study, the 99% probable maximum value of the standard range for a standard abundance of 1,000 gave the greatest and, therefore, the most cautious estimate of a population range of cnida sizes for a species. This maximum standard range is the only measure of dispersion of cnida sizes that may be used validly to demonstrate that anemone specimens are of different species, and then only if there is no overlap between the extreme cnida sizes being compared. However, partial or complete overlaps of cnida size extremes do not necessarily indicate that specimens are conspecific; other taxonomic characters must also be considered. Coefficients of variation may provide valuable clues as to the homogeneity or heterogeneity of samples of cnida measurements. This paper should be read in conjunction with the first two in this series, which address the taxonomic relevance of differences between mean cnida sizes (Williams, 1996, Sci. Mar., 60: 339-351; 1998, Sci. Mar., 62: 361-372).