Application of FAME (fatty acid methyl ester) analysis in the numerical taxonomic determination of bacterial guild structure.

Comparative numerical taxonomic analyses, using fatty acid methyl ester (FAME) profiles and phenetic characteristics, were conducted to examine bacterial guild structure in freshwater sediments. Both approaches were used to examine a subset of 60 OTUs obtained from a previously well characterized microbial community in sediments of a shallow fast flowing stream. For both classifications, greater than 80% of the OTUs were recovered in 11 and 12 major groups for FAME and phenetics approaches. However, there was not complete correspondence for the groupings of the 2 classifications, with most FAME groups being distributed among the phenetic groups and 2 phenetic groups not providing usable characteristics for FAME analysis. The results did demonstrate significant taxonomic variation in bacteria capable of occupying the same or a similar fundamental niche.