Figure 1

Quantification of symbionts in the mussels B. azoricus collected at the three vent fields Menez Gwen (MG, n = 25), Lucky Strike (LS, n = 30) and Rainbow (Rb, n = 25). Symbiont quantities in mussels used in subtractive library design are presented individually. S+, high SOX content (n = 3 ind from MG); SM-, low SOX and low MOX content (n = 5 ind from MG, LS and Rb); M-, low MOX content (n = 3 ind from Rb); M+, high MOX content (n = 3 ind from Rb). Quantities of SOX and MOX are given as relative quantity in an arbitrary unit.