Host performance associated OTUs
In total, 382 OTUs were differentially abundant between temperature regimes, 206 of which specific to 15 °C and 176 to 22 °C (Figure S2A). Between ranges, we detected 578 differentially abundant OTUs, including 205 OTUs more abundant in native and 373 OTUs more abundant in non-native populations (Figure S2B). Further, we found 29 OTUs to correlate positively and 9 OTUs to correlate negatively with RGR (Figure S2C) and 2 OTUs to correlate positively and 9 OTUs to correlate negatively with the thallus brittleness (Figure S2D).