Fig. 1

GC content of quality-filtered assembly transcripts by taxon. Comparing the GC content distribution of transcripts in the quality-filtered metatranscriptome with putative homology to higher level holobiont taxa shows that coral host transcripts are characterized by a lower GC content. A GC% content cutoff was used to classify transcripts that were not annotated to any coral holobiont taxa in an effort to include potentially novel coral transcripts in our gene expression analyses. Note that the y-axis values for the quality-filtered assembly (dashed line) are displayed on the secondary (right) axis