Fig. 3

Diversity of microbial gut communities in Atlantic cod exposed to oil. a Rarefaction curves of 16S rDNA sequences at the 97% similarity cut-off. Specimens were exposed to increasing levels of oil exposure (blue to red). Curves are labelled with sample name (treatment level and fish specimen numbers). All samples are normalized to the same sequencing depth. b NMDS plot of all samples based on Bray-Curtis dissimilarity. Oil exposure treatment codes: Ctrl = Control, no oil, Low = low concentration of oil, Med = medium concentration of oil, High = high concentration of oil. Fish from the lower and upper exposure groups are colored in red and blue tones, respectively, and fish specimen numbers are shown after treatment codes