Identification and significance of pyrochlorins in fecal pellets of the marine malacostracan crustaceans Heptacarpus rectirostris and Palaemon pacificus

The chlorophyll derivatives, especially pyrochlorins, from macrobentho-pelagic fecal pellets were separated and identified using reversed-phase high-per-formance liquid chromatography-mass spectrometry (HPLC-MS). HPLC-frit-fast atom bombardment (FAB)-MS analysis of fecal pellet extracts was performed, and the ions at m/z (mass-to-charge ratio), 534 [M]+, 827 [M+H]+ and 812 [M]+ as base peaks contirm the presence of pyropheophorbide a, pyropheophytin b and pyropheophytin a, respectively. Identification of pyrochlorins in fecal pellets suggests that decarbomethoxylation of chlorophylls can occur during bentho-pelagic grazing and that pyrochlorins in sedimentary environments may be derived in part from fecal pellets.