PCoA of the control (blue) and heated (orange) bay for the field and incubation temperature (8, 16, and 28 °C) metatranscriptomes (A). Significant differential RNA transcript numbers for open-reading frames with log₂ fold change >5 (control vs. heated bay) of selected genes in the control (blue shades) and heated (orange shades) bays (B). High log₂ fold change (blue) values indicate high transcript numbers in the control bay, while low (negative, orange) values indicate high transcript numbers in the heated bay.