marginally significantP = 0.048
The Bonferroni tests indicate that the mean O values of pairs in which both species were non-stygobites (n,n) were significantly higher than those in which both species were stygobites (s,s) ( P < 0.00001) or in which one species was a stygobite and the other one was not (s,n) ( P < 0.00001); mean O values of s,s and s,n pairs were statistically similar ( P = 0.240). The interaction term was marginally significant ( P = 0.048, Table 2 ), which suggests that the different pair types responded differently in the three years.