Fig. 3. Environmental adaptation of abundant and rare taxa in sediments. (a) Environmental breadth estimated by the threshold values of abundant and rare taxa in response to environmental variables calculated using TITAN. The threshold values were log-transformed [by log (X +1)]. (b) Phylogenetic signal showing the trait conservatism for environmental preferences of the abundant and rare taxa based on Blomberg’s K statistic. (c) Phylogenetic distribution of the top 30 most abundant taxa in the abundant and rare subcommunities and their environmental preferences. Note that taxa that could be assigned to genus level are shown as genus, otherwise as OTU ID.