Kelly C K, Purvis A
Centro de Ecologia, UNAM, Ciudad Universitaria, Apdo. Postal 70-275, C.P. 04510, Mexico.
Department of Zoology, South Parks Road, OX1 3PS, Oxford, UK.
Oecologia. 1993 Jun;94(3):356-360. doi: 10.1007/BF00317109.
Within a multi-species study, species do not necessarily represent independent data points. The data set used by Foster and Janson (1985) to look at the relationship between seed size and establishment conditions for naturally occurring tropical trees was re-analyzed, to take into account the effect of relatedness among species. The re-analysis showed that 1) this data set does not support the hypothesis that large-seeded species are more likely to establish in small gaps or shade than are small-seeded species, and 2) more than 1/3 (16 of 39) of the data points were extraneous to the test of the hypothesis. It is recommended that all ecologists, and not just those interested in evolutionary questions, consider species relatedness prior to inception of any multi-species study.
在一项多物种研究中，物种不一定代表独立的数据点。重新分析了福斯特和詹森（1985年）用于研究天然热带树木种子大小与定植条件之间关系的数据集，以考虑物种间亲缘关系的影响。重新分析表明：1）该数据集不支持大种子物种比小种子物种更有可能在小间隙或阴凉处定植的假设；2）超过三分之一（39个数据点中的16个）的数据点与该假设的检验无关。建议所有生态学家，而不仅仅是那些对进化问题感兴趣的生态学家，在开展任何多物种研究之前考虑物种亲缘关系。
