FIG. 3.

Comparison of the ¹³C-labeled PLFA distribution extracted from the Bronydd Mawr soil following incubation with 2 ppmv of ¹³CH₄ with published PLFA compositions of pure cultures of methanotrophic bacteria (9, 14). PLFA compositions used were the mole percentages of the PLFAs of pure cultures and the labeled PLFAs extracted from the soil. A hierarchical tree was produced by cluster analysis performed with the software package SYSTAT, version 7, on Euclidean distances between the standardized data using averages.