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

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)

Source	Area df = 1			Location (Re) df = 8			Site (Lo (Re)) df = 20			Residual df = 60
Source	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

ISSN: 1438-3888