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Table 3 Spatial differences in the biomass of the most important species: Corallina officinalis, Chondracanthus acicularis, Ulva spp., Ceramium botryocarpum and Osmundea pinnatifida at the scales of area, location and site (ANOVA; significance level P < 0.05)

From: Spatial variability in intertidal macroalgal assemblages on the North Portuguese coast: consistence between species and functional group approaches

Source Area df = 1 Location (Re) df = 8 Site (Lo (Re)) df = 20 Residual df = 60
MS F P MS F P MS F P MS
C. officinalis a 263.066 3.01 0.121 87.407 1.23 0.331 70.890 2.07 0.016 34.296
C. acicularis a 26.341 0.58 0.468 45.443 1.34 0.279 33.828 2.19 0.010 15.416
Ulva spp.a 35.872 7.27 0.027 4.936 1.84 0.128 2.677 1.10 0.371 2.428
C. botryocarpum a 0.028 0.21 0.660 0.135 1.56 0.199 0.086 2.03 0.018 0.043
O. pinnatifida a 0.130 0.03 0.866 4.292 1.90 0.117 2.260 1.85 0.035 1.220
  1. aVariances heterogeneous