Fig. 5.

nifH diversity recovered from Stylophora pistillata. a Maximum-likelihood topology of nifH sequences, rooted with non-nitrogen-fixing Cluster IV (see Fig. S1 for expanded nifH phylogeny). Novel nifH phylotypes from S. pistillata are denoted as “nifH novo” and boot strap >70% is indicated on applicable nodes. b Relative abundance of nifH phylotypes across S. pistillata samples by treatment. nifH phylotypes are hierarchically clustered by abundance similarity. Newly recovered nifH novo phylotypes are colored to match cluster of origin in b