Apple snails Pomacea canaliculata escaping from a paddy field into an irrigation canal in South Japan.

• Wada Takashi

  National Agricultural Research Center for Kyushu Okinawa region

• Matsukura Keiichiro

  National Agricultural Research Center for Kyushu Okinawa region

• Yoshida Kazuhiro

  The United Graduate School of Agricultural Sciences, Tottori University

• Kawanishi Yoko

  Nara Women's University

• Yusa Yoichi

  The United Graduate School of Agricultural Sciences, Tottori University

Bibliographic Information

Other Title

• 西南暖地において水田から用水路に流出するスクミリンゴガイの個体数

Abstract

As a part of our investigation to elucidate the population biology of the apple snail Pomacea canaliculata inhabiting irrigation canals, we monitored the number of snails escaping from a paddy field into an irrigation canal in Kamimine Saga, South Japan. We installed a net trap on one of the two drainage pipes in a paddy field(60 a). The number of snails trapped in the net was counted twice or three times a month during crop season (from late June to early October, 2008). Totally, 265 overwintered snails that had hatched in the previous season were trapped in the whole season. Snails of the new generation were trapped from August onwards and a total of 470 young juveniles with shell height more than 8 mm escaped from the paddy field until the end of the crop season. According to the size specific densities of snails in the paddy field, we estimated that more than several thousand snails with shell height smaller than 8 mm likely escaped through the wide mesh of the net trap and into the canal. The number of snails caught in the net had a significant correlation with the precipitation. The snails were considered to have escaped from the paddy field when paddy water overflowed into the canal. Many similar paddy fields were connected to the canal, and we therefore suspect that huge numbers of snails entered the canal from the fields. It raises a question how the escape of apple snails from paddy fields influences their population in the canals.

Journal

• Kyushu Plant Protection Research

  Kyushu Plant Protection Research 55 93-98, 2009

  The Association for Plant Protection of Kyushu

Keywords

• Ampullariidae
• net trap
• precipitation
• rice
• population ecology

Details

• CRID: 1390282679542696832
• NII Article ID: 130004548546
• DOI: 10.4241/kyubyochu.55.93
• ISSN: 18840035
• ISSN: 03856410
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed