系统发育上的操作分类单元（OTU）怎么解释？最近看了一篇文献有这样一段话“OTU definitions are usually based on 16S ribosomal DNA (rDNA) gene similarity under the assumption that a high degree of similarity will be reflected in the degree of DNA-DNA relatedness, i.e., likely to be the same species . The limitations of OTUs have previously been addressed and include inconsistent arbitrary cutoff values (1 to 5% 16S rDNA gene dissimilarities have been used [19]) and the fact that OTUs are counted equivalently despite the fact that some may be highly divergent and phylogenetically unique, whereas others may be closely related and phylogenetically redundan”，但是不明白什么意思。
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