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Deeper exploration of microbial interactions is now possible via molecular prospecting and taxon-specific experimental approaches.— CiteULike: Everyone's library
There are two general approaches for measuring community diversity: quantitative measures, which use the abundance of each taxon, and qualitative measures, which use only the presence / absence of data.— CiteULike: Everyone's library
Efforts to quantify microbial diversity often use taxon-based methods that ignore the fact that not all species are equally related, which can therefore obscure important patterns in the data.— CiteULike: Everyone's library
These methods are more powerful than taxon-based methods because microorganisms in a community differ dramatically in sequence similarity, which also often correlates with phenotypic similarity in key features such as metabolic capabilities.— CiteULike: Everyone's library
In particular, biologists have not determined the relative roles of taxon-specific characteristics that influence diversification and distribution, and region-specific features that promote and constrain diversity.— CiteULike: Everyone's library

American Heritage Dictionary (1)
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