Distribution of specific prokaryotic immune systems correlates with host optimal growth temperature.

Corroborating that the number of immune systems and genome size are positively correlated, a highly significant positive linear correlation between genome size and the average number of immune systems encoded exists in both bacteria and archaea (Figure 2D ; Pearson correlation bacteria: moderate positive coefficient 0.43, P < 10 −99 ; archaea: weak positive coefficient 0.38, P < 10 −10 ).

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In contrast, for RM systems, both a weak positive and a weak negative correlation between abundance and T opt have been reported, with both observations being only marginally statistically significant ( 31 , 32 ).

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