TABLE 2.

Statistical analyses of frequency differences of various genetic and phenotypic traits of V. fischeri isolates collected from different host populations on Oahu in 2005

Test and traitχ2tdfU% of cells <5bP valueaFisher's exact test P valuea
Chi-square test
    VfRep type20.4217**** (****)**** (****)
    Bioluminescence level5.510*** (***)*** (***)
    Colony pigmentation6.710**** (***)*** (***)
Mann-Whitney-Wilcoxon test
    Motility rate776**** (****)
    Siderophore production451* (*)
Welch t test, growth rate2.4650.75*** (***)
  • a The correction of P values for multiple testings was performed by considering each test as a family of tests. The P values were analyzed and adjusted according to the method of Hommel (31); corrected values are in parentheses. Ranges of calculated P values: *, P > 0.1; **, 0.1 > P > 0.05; ***, 0.01 < P < 0.05; ****, P < 0.01.

  • b The percentage of cells <5 refers to a common benchmark for the validity of χ2 analysis.