Correction to: The ISME Journal

https://doi.org/10.1038/s41396-018-0160-7

Since publication of our article, the authors have identified an error in Eq. (1). The correct equation is

$$V_d = \frac{{\mathop {\sum}\nolimits_{j = 1}^6 {F_j} }}{{\mathop {\sum}\nolimits_{j = 1}^6 {\mathop {\sum}\nolimits_{i = 1}^5 {N_{j,i}} } }}$$
(1)

All the reported results are calculated correctly by this equation. Therefore, there is no change in our reported values. The authors would like to apologize for any inconvenience caused by this error.