Voucher Sponge Site / year Frequencies Interactivity clusters absolute (relative) I                  II  III 62009Dr Dr Ca/2009 1 (8.3%) 1 1 6 42006Dr PV/2006 32007Dr PV/2007 12007Hv H Ca/2007 3 (37.5%) 2 2 2 32007Hf   PV/2007         32007Hh Hh PV/2007 2 (16.6%) 2 2 5 92010Hh   Us/2010         82011Hh   Us/2011         82005Mm Mm Pv/2005 15 (17.0%) 10 4 8 42006Mm   Pv/2006         92010Mm   Us/2010         82011Mm   Us/2011         Weighted mean    17.50%

Cagarras Archipelago (CA), Praia Vermelha beach (PV), Urca square (Us). Sponge: Dragmacidons reticulatum (Dr), Haliclona sp. (H), Hymeniacidon heliophila (Hh), Mycale microsigmatosa (Mm). Number of isolates classified into three different interactivity clusters, termed: (I) active, (II) sensitive and (III) resistant strains.

Table 4: Cross-inhibition among bacteria isolated from the same sponge collected from different sites and dates.