2010年3月
The impact of nigorobuna crucian carp larvae/fry stocking and rice-straw application on the community structure of aquatic organisms in Japanese rice fields
FISHERIES SCIENCE
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- 巻
- 76
- 号
- 2
- 開始ページ
- 207
- 終了ページ
- 217
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s12562-009-0200-3
- 出版者・発行元
- SPRINGER TOKYO
We examined the effects of predation by Nigorobuna Carassius auratus grandoculis larvae and fry, a crucian carp endemic to Lake Biwa, Japan, on the community structure of aquatic organisms in rice fields. Six experimental plots with three different rice-straw treatments in the presence/absence of stocked larvae were prepared. In each plot, the number of aquatic organisms ranging in size from 30 mu m to 5 mm in the water, as well as those from 63 mu m to 5 mm in size in the surface sediments, was surveyed 6, 13, 20, 26, 34, and 41 days after the onset of irrigation. Three-day-old fish larvae were released on day 10. Undigested organisms in the gut contents of the larvae or fry were identified on days 20, 26, 34, and 41, respectively. Ten-day-old larvae mainly preyed on Cladocera, but the fry thereafter shifted to Diptera as their main prey. While Cladocera and Podocopida decreased in fish-stocked plots, Euglenales and Halteriida became more abundant there. Top-down or bottom-up effects of fish seemed to control these changes in community structure.
- リンク情報
- ID情報
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- DOI : 10.1007/s12562-009-0200-3
- ISSN : 0919-9268
- CiNii Articles ID : 10026162991
- Web of Science ID : WOS:000277183300005