堆積物中の光合成色素を指標とした浜名湖における光合成生物群と環境変動の研究

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This thesis focuses on the potential of photosynthetic pigments of phototrophs in lake sediments as a biomarker that indicates the changes in aquatic environments in the past. Using chlorophyll derivatives formed through grazing of algae by zooplankton, and accumulated in sediments as grazing indicators, difference in the accumulation efficiency of each pigment could be attributed to selective grazing by zooplankton and seasonal variations in algal assemblages. The vertical distributions of photosynthetic pigments and Mo in the ^<210>Pb-dated sediment core demonstrated that the anoxic zone has existed in the central basin of Lake Hamana over at least the last 〜 250 years, and that the primary production by algae and phototrophic sulfur bacteria and the extent of anoxia have closely related. The construction of training walls in the Imagire-guchi Channel during 1954〜1956 introduced the most dramatic change over a wide extent of Lake Hamana. By comparing the composition of photosynthetic pigments in sediment cores obtained from the central and 4 attached basins of Lake Hamana, it hasbeen found that the exchange of water by seawater intrusion in each enclosed basin has strongly affected the extent of anoxia indicated by the ratio of total bacterial carotenoids to total algal carotenoids inthe sediments.
社団法人日本分析化学会の論文
2004-08-05