Measurement of faunal similarity in paleontology
Measurement of faunal similarity in paleontology
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DOI：
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发表时间：
1979-09
影响因子：
1.4
通讯作者：
D. Raup;R. E. Crick
中科院分区：
文献类型：
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作者：
D. Raup;R. E. Crick
提出了一个区系相似性的概率指数，它将两个区系共有的分类群数量与随机分布的分类群预期共有的数量进行比较。观测值与预期值的偏离通常表示相似或不相似的程度。分类群在整个数据集中的频率用于调整分类群发生的不同概率（世界性与地方性）。新的指数可以用来确定动物群之间的相似性或差异性是否具有统计意义。采用1)现代棘虫生物地理、2)圣莫尼卡湾现代有孔虫环境分布、3)奥陶纪鹦鹉螺生物地理对指数进行了检验。在每种情况下，所提出的指数都比传统的动物相似性指数（Simpson， Jaccard和Dice系数）更有效，此外还有可能对统计置信度进行严格评估的优势。该指数在生物地层学方面也应该是有用的。用于计算该指数的计算机程序可从作者处获得。
A probabilistic index of faunal similarity is proposed which compares the number of taxa common to two faunas with the number that would be expected to be in common if the taxa were distributed randomly. Departures of observed from expected numbers in common express the level of similarity or dissimilarity. The frequency of taxa in the whole data set is used to adjust for the differing probability of occurrence of taxa (cosmopolitan versus endemic). The new index can be used to determine whether similarities or dissimilarities between faunas are statistically significant. The index is tested with 1) modern biogeography of echinoids, 2) environmental distribution of modern foraminifera in Santa Monica Bay, and 3) Ordovician biogeography of nautiloids. In each case, the proposed index is more effective than traditional indexes of faunal similarity (Simpson, Jaccard, and Dice coefficients) in addition to the advantage of making possible rigorous assessment of statistical confidence. The index should also be useful in a biostratigraphic context. The computer program used for calculating the index is available from the authors.