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富江湾の炭酸塩堆積物に含まれる脂質の組成と分布


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Title: 富江湾の炭酸塩堆積物に含まれる脂質の組成と分布
Other Titles: Composition and Distribution of Lipid Compounds in Carbonate Sediments from Tomie Bay
Authors: 近藤, 寛 / 石渡, 良志 / 福田, 久美子
Authors (alternative): Kondo, Hiroshi / Ishiwatari, Ryoshi / Fukuda, Kumiko
Issue Date: 28-Feb-1993
Publisher: 長崎大学教育学部
Citation: 長崎大学教育学部自然科学研究報告. vol.48, p.47-64; 1993
Abstract: Tomie bay is the region of the warm Tsushima current, and its sediments are very rich in calcareous remains. Eight sediment samples having CaCO3 concentrations ranging from 58.3% to 92.9% were assembled into the 3 groups by means of mud (%), CaCO3 (%) and C/N ratio. These groups are fine sands from offshore, muddy fine sands from the mid bay and very fine sands from the inner bay. The calcareous sediments were analyzed for n-alkanes, n-alcohols, sterols and fatty acids.The concentrations of these compounds are less than one tenth those in the muddy sediments from Omura and Imari Bays. Distributions of n-alkanes exhibit slight odd carbon-number predominances in the C14-C35 ranges. A major peak at C29 or C31 and a minor peak C17 are characteristic of autochthonous and allochtonous natural inputs, respectively. Sands from inner bay show a maximum at C17 or C21. These sediments exhibit the humps which are related to oil-pollution. Distribution of n-alcohols ranging from C14 to C32 show the high even carbon-number predominances and a maximum at C22 or C24 which is indicative of an origin from higher plants. The secondary peak at C16 is characteristic of allochtonous natural inputs. The sand from St.8 at inner bay shows a maximum at C16. A total of 12 different 4-methyl-sterols, which are thought to be characteristic of dinoflagellate input, were identified and account for 14% to 33% of the 4- methyl-and 4-desmethyl-sterols. Dinosterol is the most abundant compound accounting for 31% to 44% of the 4-methyl-sterols. A predominance of dinosterol is shown in the muddy fine sands from mid bay. A total of 21 different 4-des- methyl-sterols are identified. The predominant compounds are 22-dehydrocholesterol, cholesterol, cholestanol, brassicasteol, β-sitosterol and stigmastanol accounting for 71% of 4-desmethyl-sterols. The sands from inner bay are rich in cholesterol which is generally attributed to zooplankton or other marine fauna, and show the low ratio of stanols to stenols. Fatty acids consist of saturatesd fatty acids, mono- adn poly-unsaturated fatty acids and branched fatty acids. The sands from the inner bay are rich in C16 :1, C20:4, C20:5.The presence of these unsaturated fatty acids implies that the lipids represent the original biological input to the sediment and that the lipids have not undergone extensive degradation or alteration. The muddy sands from mid bay contained large amounts of branched fatty acids such as iso-C15, iso-C17, anteiso-C15,and anteiso-C17 which are usually taken as bacterial indicators.
URI: http://hdl.handle.net/10069/32252
ISSN: 0386443X
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:No. 48

Citable URI : http://hdl.handle.net/10069/32252

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