Fig. 3: Consistency of nutrient responses across microbial life history strategies.
From: Life history strategies among soil bacteria—dichotomy for few, continuum for many
A Points represent multi-isotopic excess atom fraction (EAF) of individual bacterial taxa, based on parallel seven-day 13C and 18O incubations, and averaged across all replicates in a given treatment (n = 12). Colors represent approximations of ecological life history strategies generated from bivariate Gaussian finite mixture models and specifying two components. Ellipsoides represent 95% confidence intervals around cluster centroids while black lines indicate principal coordinates axes of clusters. Soil treatments (C and CN) represent a carbon amendment (1000 μg glucose per g dry soil) and a carbon and nitrogen amendment (glucose + 100 μg-N [NH4]2SO4 per g dry soil) respectively. For direct comparison with 13C, EAF values of 18O were divided by 0.6 (µ) to account for multiple oxygen sources utilized during bacterial growth. B Number of times bacterial taxa across replicates were clustered into the copiotrophic category (positive values) or into the oligotrophic category (negative values). Bars are colored by life history classifications made from the most frequent classification of phyla in the literature as collected by Ho et al. [23] (top) or made from mixture model clusters in part A (bottom).
