An effect of irrigation and cultivation system on food chain in paddy water environment: A study on availability of stable isotope ratios approach to examine paddy water ecosystem
2005
Konagaya, S.(Ibaraki Univ., Ami (Japan)) | Kobayashi, H.
For the purpose of examining on role of irrigation and cultivation system to paddy ecosystem, we study species and number of Odonata larvae and analyze the stable isotope ratios of the Odonata larvae and the plankton/detritus in water of paddy fields and irrigation ponds. As a results, cultivation system clearly effects to composition of species and number of Odonata larvae. delta sup(13)C indicates that Orthetrum albistylum speciosum larvae and Coenagrionidae spp. larvae which are dominant species in paddy water, depend on specified food sources, each other. delta sup(15)N shows that the trophic level of Odonata larvae is higher than that of the plankton/detritus in paddy water. It is considered that analyze the stable isotope ratios application is effective to examine water ecosystem and food web in paddy.
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