Occurrence of the giant African snail in the Ogasaware (Bonin) Islands, Japan.
Occurrence of the giant African snail in the Ogasaware (Bonin) Islands, Japan.
复制标题
巨型非洲蜗牛出现在日本小笠原群岛。
作者：
K. Takeuchi;S. Koyano;K. Numazawa
非洲巨型蜗牛在日本小笠原群岛的出现 K. TAKEUCHI 1 , s. KOYANO 和 K. NUMAZAWA 小笠原亚热带农业研究中心，小笠原村，父岛，东京，100-21，日本 摘要：非洲巨型蜗牛 Achatina fulica Bowdich 于 1930 年代从台湾引入小笠原。人口在 1940 年代逐渐增加，并在 1950 年代达到高密度。在此期间，尽管人工采摘并用四聚乙醛诱饵，但蜗牛遍布整个岛屿，对农作物造成严重损害。掠食性陆地蜗牛 Euglandina Rosea Ferussac 于 1965 年从夏威夷引入小笠原。但其种群密度非常低，仅限于父岛的少数地区。 1985年，我们开始对黄苋生活史及其种群密度波动因素进行生态学研究。 1986年，所有受侵染地区的黄蜂种群密度开始急剧下降。人口在经历了 30 年的增长之后突然下降，其原因尚不清楚。
Occurrence of the Giant African Snail in the Ogasawara (Bonin) Islands, Japan K. TAKEUCHI 1 , s. KOYANO and K. NUMAZAWA Ogasawara Subtropical Agricultural Research Centre, Ogasawara-mura, Chichijima, Tokyo, 100-21, Japan Abstract-The giant African snail, Achatina fulica Bowdich, was intro duced from Taiwan into Ogasawara in the 1930's. The population grad ually increased during the 1940's and reach high densities in the 1950's. During this period, snails spread over the entire islands and caused serious damage to agricultural crops in spite of hand picking and baiting with metaldehyde. The predatory land snail, Euglandina rosea Ferussac, was introduced from Hawaii to Ogasawara in 1965. However, its pop ulation density was very low and it was restricted to a few areas in Chichijima Island. In 1985, we started ecological studies on the life history of A. fulica and the factors responsible for fluctuation of its population density. In 1986, the population density of A. fulica started to decline sharply at all the infested areas. The reasons for this sudden decline of population after a 30-year build up have yet to be identified.