Nucleotide diversity in the sabkha The overall combined microbial population nucleotide diversity (π) was highly significant for all inner microbial communities compared to outside the sabkha (Fig. 5 A) as is evident for each sampling site on the inner (s1, s3, s8, s12) compared to outer (s13, s14, s17, s18) ( t test Bonferroni p < 0.05) (Supplementary Fig. 8 ).
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