| Project/Area Number |
21580243
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | Lake Biwa Museum |
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Principal Investigator |
OHTSUKA Taisuke 滋賀県立琵琶湖博物館, 研究部, 専門学芸員 (60344347)
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|---|
| Co-Investigator(Renkei-kenkyūsha) |
FUJITA Yuko 京都大学, 基礎物理学研究所, 特別教育研究助教 (00324707)
MAEHATA Masayoshi 神戸学院大学, 人文学部, 教授 (30359260)
KUSUOKA Yasushi 滋賀県立琵琶湖博物館, 研究部, 専門学芸員 (80359265)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2009: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | ニゴロブナ / タマミジンコ / ユスリカ / 成長モデル / 水田 / 初期成長 / トップダウン栄養カスケード / von Bertalanffyの成長式 / 間接ボトムアップ / ミジンコ / 原生動物 / 植物プランクトン / 稲藁施用 |
|---|
| Research Abstract |
Crucian carp larvae showed rapid growth in paddy fields. The standard body length increased linearly except for the post-larva stages after they consumed cladocerans. This pattern suggests that the assimilation rate was usually much higher than the catabolic rate, and the food availa-bility was usually sufficient. Cladoserans were almost extinguished and ostracods were much decreased in experimental plots with fish. A top-down trophic cascade was observed, that is, microorganisms whose sizes correspond to the filtering mesh size of cladocerans became more abundant in the plots with fish than those without fish.
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