Source of Variation SS df MS F P-value F crit Rows 13.88135 23 0.603537 2.988639 0.00024 1.686897 Columns 14.73547 3 4.911822 24.32272 7.53E-11 2.737492 Error 13.93412 69 0.201944       Total 42.55094 95

Table 4: Two-way ANOVA for differences in DO between seasons and stations along Muthupettai coastal waters during the study period (January-2010 to December-2011).