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Table 4 Analyses of variance on environmental variables in relation to habitats (2 levels, fixed), areas (4 levels, nested in habitat)

From: Anthropogenic disturbance and spatial heterogeneity of macrobenthic invertebrate assemblages in coastal lagoons: the study case of Pialassa Baiona (northern Adriatic Sea)

  Source of variation Habitat
(1 df)
Area (Habitat)
(6 df)
Residual
(32 df)
Transf. MS F P MS F P MS
Depth None 18.5913 15.30 0.0079 1.2152 2.28 0.0603 0.5326
Sand None 361.8022 0.95 0.3678 381.5869 1.00 0.4410 380.7758
LOI None 0.9303 0.02 0.8880 43.1162 2.57 0.0381 16.7835
RDP Ln (X + 1) 17.1400 5.93 0.0508 2.8887 5.93 0.0003 0.4874
Spw a Sqrt (X + 1) 0.2459 2.37 0.1745 0.1037 2.37 0.0526 0.0438
Ts None 0.7562 0.02 0.8973 41.7479 64.54 0.0001 0.6469
Hg Sqrt (X) 8.1432 1.03 0.3483 7.8687 6.96 0.0001 1.1300
Dc a Ln (X) 2.8357 3.75 0.1009 0.7558 3.03 0.0185 0.2495
Ds X^0.6 1909.0580 0.18 0.6854 10549.6195 29.05 0.0001 363.2033
      Area Residual
      (3 df) (16 df)
Fm None     0.0110 3.13 0.055 0.0035
  1. LOI organic carbon as loss of weight on ignition, RPD apparent redox potential discontinuity, Spw pore water, Ts water surface temperature, Hg total mercury, Dc distance from the confluence point, Ds distance from the main sewage input, Fm mean water flow speed
  2. When variances were slightly heterogeneous (Cochran’s C test: 0.01 < P < 0.05) even after transformation, the significant level was reduced to P < 0.01
  3. aCochran’s C test: P < 0.05