Table 1 Comparison of per-taxon carbon use efficiency functions.

From: Nutrients cause consolidation of soil carbon flux to small proportion of bacterial community

Relation to community CUE

CUE (growth)

ΔAICco2

ΔAICcue

ΔAICcombn

Constrained

Unimodal0.5

2.98

5.20

11.17

Linear positive

6.10

0

12.21

Unimodal0.05

0

14.39

14.39

Linear negative

2.85

19.87

25.56

Exponential decline

4.38

20.33

29.08

Unconstrained

Exponential decline

17.43

46.25

81.10

Linear negative

21.96

40.89

84.80

Unimodal0.05

19.58

47.72

86.89

Linear positive

23.56

50.77

97.89

Unimodal0.5

23.47

50.99

97.94

  1. Akaike information criterion values expressed as the difference from the model with the lowest error (ΔAIC) returned from regression models under different assumptions of per-taxon carbon use efficiency (CUE) as a function of per-taxon growth rate denoted by the CUE(growth) column. Per-taxon CUE estimates were calculated either constrained by the minimum and maximum observed community-level CUE values or bounded only by 0 and 0.85 (unconstrained). For all regression models, both terms were z-transformed. ΔAICco2 indicates the fit of summed per-taxon respiration to measured respiration. ΔAICcue indicates the fit of summed relative abundance-weighted per-taxon CUE to community-level CUE. ΔAICcombn indicates the sum of 2(ΔAICco2) and ΔAICcue. Subscripts following unimodal function names indicate whether maximum per-taxon CUE was centered over a growth rate of 0.5 or the global median growth rate of 0.05 observed across all taxa.
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