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Table 2 Results of two-way ANOVA for comparison of densities: variation of total density between study sites and months; variation of population groups (males, females and juveniles) in La Estafeta and Mar del Plata harbour between months and groups; and variation of female groups (pre-ovigerous, ovigerous and post-ovigerous females) among months and groups

From: Comparison of life history traits of Tanais dulongii (Tanaidacea: Tanaididae) in natural and artificial marine environments of the south-western Atlantic

Comparison Source of variation df MS F P
Total density Study site 1 1901423.50 163.29 <0.001
Month 10 135326.52 11.62 <0.001
Study site × month 10 125054.34 10.74 <0.001
Error 82 11644.69   
Mar del Plata harbour Month 11 1465.91 3.74 <0.001
Group 2 2617.81 6.67 0.002
Month × group 22 857.52 2.19 0.004
Error 129 392.25   
La Estafeta Month 10 94075.53 24.42 <0.001
Group 2 299302.19 77.68 <0.001
Month × group 20 29997.35 7.79 <0.001
Error 129 3852.89   
Females MdP harbour Month 11 1038.59 4.11 <0.001
Group 2 1308.39 5.18 0.007
Month × group 22 496.15 1.96 0.011
Error 129 252.75   
Females La Estafeta Month 10 17504.57 14.31 <0.001
Group 2 108153.70 88.41 <0.001
Month × group 20 9933.73 8.12 <0.001
Error 129 1223.28   
  1. df degrees of freedom, MS mean squares