TABLE 2.

MacDonald-Kreitman test results of neutrality for cyrB adenylation domain sequences obtained from environmental samplesa

ComparisonInterspecific fixed nucleotide differenceIntraspecific nucleotide polymorphismsP value
SynNon-synSynNon-syn
A. ovalisporum-like vs Cylindrospermopsis14 (14)6 (6)10 (6)33 (25)0.00066*** (0.00044***)
A. ovalisporum-like vs Aphanizomenon sp.13 (13)6 (6)10 (6)33 (25)0.00134** (0.00086***)
A. ovalisporum-like vs Oscillatoria PCC650664 (64)29 (29)10 (6)32 (24)0.00000*** (0.00000***)
  • a Numbers in parentheses show values obtained with the data set when sequences with a single nucleotide change from the A. ovalisporum FAS-AP1 sequence are removed. Syn, synonymous; Non-syn, nonsynonymous; ***, P < 0.001; **, 0.001 < P < 0.01.