Because MIB and geosmin are derived from monoterpene and sesquiterpene precursors, respectively (nentley and Meganathan 1981), the association of these compounds with lipohilic pigment syntheses has been postulated. Naes et al. (1985-1988) and Bowner et al. (1992) noted that geosmin syntheses in or by Oscillatoria brevis (Kütz) Gomont and Anabaena circinalis Rabenhorst respectively appears to be related to chlorophyll a and carotenoid synthesis.