The cause of mollusk decline on the Ogasawara Islands
The cause of mollusk decline on the Ogasawara Islands
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DOI：
10.1023/b:bioc.0000021334.39072.2d
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发表时间：
2004-07-01
影响因子：
3.4
通讯作者：
Ohbayashi, T
中科院分区：
文献类型：
--
作者：
Okochi, I;Sato, H;Ohbayashi, T
研究了小笠原群岛陆生蜗牛数量的减少。在Hahajima，主要的外来捕食者，如Euglandina rosea和Platydemus manokwari并不存在，但一些小的地方性蜗牛，如Hirasea spp。和Ogasawarana spp.，已经是罕见的和更常见的地方性蜗牛，例如，Mandarina spp.，在北方山区也在减少。这种下降不能直接用森林砍伐及其随后的再生来解释。在圈养条件下，发现三种扁形虫吃小蜗牛。这些扁虫的分布仅限于哈哈岛的北方山区，那里的Mandarina正在下降，生存率很低。这些掠食者是地方性蜗牛减少的一个可能原因。
Decline of land snails on the Ogasawara Islands was studied. In Hahajima, major alien predators such as Euglandina rosea and Platydemus manokwari are not present, but some small endemic snails, for example, Hirasea spp. and Ogasawarana spp., are already rare and more common endemic snails, for example, Mandarina spp., are also declining in the northern mountains. The decline cannot be directly explained by forest deforestation and by its subsequent regeneration. Three species of flatworms were found to eat small snails under captive conditions. The distribution of these flatworms is restricted to the northern mountains of Hahajima where Mandarina is declining and its survival is low. These predators are plausible candidates as a cause of the decline of the endemic snails.