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<p>The apple snail <i>Pomacea canaliculata</i> (Lamarck) (Architaenioglossa: Ampullariidae) is a large freshwater snail from South America and has become a severe pest of rice plants in many countries, including Japan. There are known predators, such as carp and turtles, that can control the number of apple snails, but many of these predators are rarely found in paddy rice fields. The carrion crow <i>Corvus corone</i> Linnaeus (Passeriformes: Corvidae) has recently been found to prey on apple snails in rice fields in limited locations in western Japan. We evaluated the effects of predation by carrion crows on apple snail populations in rice fields at four locations in Japan (Fukuoka, Ehime, Hyogo, and Nara) from September 2019 to 2021. The densities of not only snails larger than 17.5&#xa0;mm but also those between 7.5 and 17.4&#xa0;mm were lower in fields with crow predation than in those without it. Moreover, the greater the number of snails preyed upon on the levee, the lower the snail density in the adjacent field. These results suggest that crow predation effectively reduces snail density in rice fields.</p>

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Effects of predation by the carrion crow Corvus corone (Passeriformes: Corvidae) on field populations of the apple snail Pomacea canaliculata (Architaenioglossa: Ampullariidae)

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Haruka Uehara,
  • Yoichi Yusa

摘要

The apple snail Pomacea canaliculata (Lamarck) (Architaenioglossa: Ampullariidae) is a large freshwater snail from South America and has become a severe pest of rice plants in many countries, including Japan. There are known predators, such as carp and turtles, that can control the number of apple snails, but many of these predators are rarely found in paddy rice fields. The carrion crow Corvus corone Linnaeus (Passeriformes: Corvidae) has recently been found to prey on apple snails in rice fields in limited locations in western Japan. We evaluated the effects of predation by carrion crows on apple snail populations in rice fields at four locations in Japan (Fukuoka, Ehime, Hyogo, and Nara) from September 2019 to 2021. The densities of not only snails larger than 17.5 mm but also those between 7.5 and 17.4 mm were lower in fields with crow predation than in those without it. Moreover, the greater the number of snails preyed upon on the levee, the lower the snail density in the adjacent field. These results suggest that crow predation effectively reduces snail density in rice fields.