| Project/Area Number |
24656308
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Civil and environmental engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
NISHIMURA Osamu 東北大学, 工学(系)研究科(研究院), 教授 (80208214)
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| Co-Investigator(Kenkyū-buntansha) |
藤林 恵 東北大学, 工学(系)研究科(研究院), 助教 (70552397)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 腐食連鎖 / 必須脂肪酸 / マルタニシ / 原生動物 / フン / タニシ |
|---|
| Research Abstract |
Essential fatty acids including 20:5n3, 20:4n6 and 22:6n3 have been widely known as important nutrient for animals. Generally, these fatty acids have been considered to be produced by algal species in aquatic ecosystems. In this study, we found that feaces from freshwater snail and fish included these essential fatty acids even these fatty acids were absent in their food sources. We also found that protozoa swarmed on the feaces but almost no protozoa were detected on the food sources which was original of the feaces in the laboratory experiments. Moreover, significant positive relationship between density of protozoa and concentration of essential fatty acid in the feaces were confirmed. It indicate that essential fatty acid in feaces would be attributed to the presence of protozoa. Swarm of protozoa on the feaces seemed to enhance the nutritional quality of feaces in detrital food web.
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