Ecological evaluation of restration techniques on paddy fields as feeding sites of Japanese crested ibises

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I aimed to evaluate the effectiveness of the two restoration techniques on paddy field, i.e. newly created 'e'(a small irrigation ditch system in a paddy) and flooded fallow paddy field (keeping flooded condition throughout the year), for the purpose of increasing biodiversity and biomass of prey species or the crested ibis in Sado island, Niigata prefecture, Japan. To clarify the ecosystem in paddy field, I examined the food-web structure of aquatic community by nitrogen and carbon stable isotopes analyses. Newly created 'e' and flooded fallow paddies kept higher both in abundance and species richness compared to the paddy fields. From the stable isotopes analyses, food-wed structures of created 'e' and flooded fallow paddies were similar to hose of paddy fields.