Abstract

rRNA operon (rrn) copy number is a functional trait that reflects the ecological strategies of bacteria. Here, we estimated the average rrn copy number of soil bacterial communities in postglacial ecosystems of Mount Gongga using the 16S rRNA gene sequencing data and the ancestral trait reconstruction method. We found that the community rrn copy number decreased with soil depth and ecosystem succession. More than 90 % of the variations were explained by soil pH and resource availability, indicating that this trait was under strong selection pressure of environmental factors. Thus, community rrn copy number may reveal the changes in bacterial community from the perspective of adaptive strategies, which is a complement to the taxonomic approach.

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