[BPT04-P06] Distribution pattern of minerals and iron-oxides in hydrothermal vent shrimp Rimicaris with special focus on its gut contents
Keywords:Hydrothermal vent, bioaccumulation, ore deposit, macrofauna
We found Barite (BaSO4), Sphalerite (ZnS), Chalcopyrite (CuFeS2), Pyrite (FeS2), Marcasite (FeS2), Argentite (Ag2S) and Hematite (Fe2O3) on the surface and in the gut of the Rimicaris. Nano- to micron sized iron-oxides were dominated in everywhere we examined, i.e. the surface, mouth part, stomach and gut. Relative amount of the iron-oxides largely increased between mouth and gut. In contrast, sulfide minerals decreased between them. Maximum diameters of those mineral particles drastically decreased through the digestive tract, especially at the mouthpart and the stomach. Those features suggest that the Rimicaris crushes the mineral particles at the mouthpart and within the stomach, and the sulfide minerals are consumed and/or deserted at the stomach.