1. Katano O, Hosoya K, Iguchi K, Aonuma Y (2001) Comparison of fish fauna among three types of rice fields in the Chikuma River basin. Jpn J Ichthyol 48(1):19–25. (The Ichthyological Society of Japan)
2. Ministry of Agriculture, Forestry and Fisheries of Japan (2005) Census of Agriculture and Forestry 2005. http://e-stat.go.jp/SG2/eStatGIS/page/download.html . Accessed 1 March 2015
3. Ministry of Agriculture, Forestry and Fisheries of Japan (2010) Census of Agriculture and Forestry 2010. http://e-stat.go.jp/SG2/eStatGIS/page/download.html . Accessed 1 March 2015
4. Ministry of the Environment, Japan (2015) Red list. Ministry of the Environment. http://www.biodic.go.jp/english/rdb/rdb_f.html . Accessed 1 March 2016
5. Natuhara Y (2013) Ecosystem services by paddy fields as substitutes of natural wetlands in Japan. Ecol Eng 56:97–106