Table 1. Similarity (ANOSIM) between trace elements fingerprinting of Cerastoderma edule shell from five locations within Mira (M1 and M2), Espinheiro (E1 and E2) and Ílhavo (I) Channels in Ria de Aveiro (Portugal).

Locations	R	p
M1 vs M2	0.503	0.002
M1 vs E1	0.238	0.025
M1 vs E2	0.202	0.028
M1 vs I	0.401	0.002
M2 vs E1	0.641	0.001
M2 vs E2	0.428	0.001
M2 vs I	0.563	0.001
E1 vs E2	0.123	0.059
E1 vs I	0.673	0.001
E2 vs I	0.643	0.001