Table 3. Details on the results of the analysis of the molecular variance (AMOVA) performed using three groups for the collection sites of Ircinia fasciculata: Alboran Sea (TAR and GRA), Western Mediterranean (CAI, ESC, TOS, BLA, CAL and ALI), Pre-Balear islands (CAB and COR), Thyrrenan Sea (NAP) and Adriatic Sea (CRO).

Source of variation	Sum of squares	Variance components	Percentage variation	Fixation indices	P-value
Among groups	18.7940	0.0427	1.9200	0.01923	0.01214
Among populations within groups	38.5160	0.0765	3.4500	0.03516	0.00000
Among individuals within populations	348.9400	−0.1818	−8.2000	−0.08663	1.00000
Within individuals	442.5000	2.2809	102.8300	2.28093	0.99496

See Table 1 for full name of locations. Significant P-values are in bold.