Mathematics – Logic
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..251k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 2, pp.251-266
Mathematics
Logic
2
Scientific paper
Fatty acids (FAs), - and -hydroxy acids, , -dicarboxylic acids and n - alkanes were studied in a 200 m sediment core taken from Lake Biwa, Japan. FAs showed bimodal distribution with peaks at C 16 and C 22 -C 28 . Their distribution patterns clearly changed with depth from lower molecular weight (C 12 -C 19 ) predominance to higher molecular weight (C 20 -C 32 ) predominance in the upper 20 m interval. Analyses of related compounds ( - and -hydroxy acids and , -dicarboxylic acids) suggest that - and -oxidative degradation of C 12 -C 19 FAs has occurred in the sediments. The ratio of bound C 12 -C 19 to unbound FAs increases with depth in the upper 0-1 m sediments, suggesting that unbound FAs are more labile. However, the ratio varies significantly in deeper sections and may be associated with water temperature. In the sediments deeper than 20 m in depth, C 12 -C 19 FAs gradually decrease. On the other hand, higher molecular weight FAs (HFAs: C 20 -C 32 ), which were probably derived from terrestrial plants, increase in concentration from 20 m to 100 m, suddenly decrease at 100 m and show progressively lower concentration in deeper sediments. These fluctuations are interpreted in relation to paleolimnological changes of the lake and the drainage basin. -Hydroxy C 20 -C 30 acids and C 20 -C 30 , -dicarboxylic acids show a distribution pattern similar to HFAs. Branched chain FAs, -hydroxy acids and C 9 -C 19 , -dicarboxylic acids show a major peak around 3-15 m in depth. This peak is probably caused by increased bacterial activity in the water column and surface sediments in the past, which may be associated with an increase in primary production of the lake.
Ishiwatari Ryoshi
Kawamura Kimitaka
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