Microbiome and photoperiod interactively determine thermal sensitivity of polar and temperate diatoms.The effect of temperature on ectothermic organisms in the context of climate change has long been considered in isolation (i.e. as a single driver).  While temperature-dependent growth of the temperate diatom was constrained by short and long photoperiods, the polar diatom coped with a 24 h photoperiod up to its thermal optimum (9°C). 
THERM