部分循環汽水湖-鹿児島県貝池-における懸濁物質と堆積物中のバクテリアバイオマーカー

概要

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Lake Kai-ike (max. water depth: 11m) is a brackish meromictic lake, which is characterized by the occurrence of a dense "bacterial plate", inhabited by purple sulfur bacteria, Chromatium sp. at the mid-depth (ca. 4.5m). The lipids in the sediment core and particulate matter in the water column were analyzed to identify and quantify possible bacterial biomarkers. Particulate materials collected from near the "bacterial plate" contained large amounts of alkenes, alkenols and alkenoic acids, in addition to C_<25> and C_<30> acyclic isoprenoid alkanes. The sediment of L. Kai-ike has a great deal of complicated compounds, including cyclic and acyclic isoprenoids. Phytane and PMI disappeared remarkably from surface layer of sediment to 3cm in depth. On the contrary, farnesol and alkenol (C_<16:1>: hexadec-9-enol) probably derived from bacteriochlorophylls c, d or e of green sulfur bacteria, once decreased and again increased in the bottom sections (>40cm) of the core. The concentrations of octahydrosqualene, a C_<30> acyclic isoprenoid alkene, did not show apparent decreasing or increasing trends. The sedimentary organic matter of the meromictic lake has a potential to estimate the changes of bacterial community in the past.
日本有機地球化学会の論文
2003-08-20