Why have endemic pollinators declined on the Ogasawara Islands?
Why have endemic pollinators declined on the Ogasawara Islands?
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DOI：
10.1007/s10531-008-9355-y
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发表时间：
2008-06-01
影响因子：
3.4
通讯作者：
Okochi, Isamu
中科院分区：
文献类型：
--
作者：
Abe, Tetsuto;Makino, Shun'ichi;Okochi, Isamu
最近，距离日本本土以南 1000 公里的亚热带太平洋岛屿小笠原群岛的赏花游客数量有所减少。这项研究的目的是确定传粉媒介减少的主要原因。我们假设了四个假设，（i）蜜蜂竞争假设，（ii）森林衰退假设，（iii）农业杀虫剂假设和（iv）变色龙捕食假设。通过野外分布调查、文献历史调查和网笼捕食实验对它们进行了测试。因此，影响岛屿分布的因素以及观察到的本地传粉媒介减少的时间支持变色龙捕食假说，而不是其他假说。此外，捕食实验的结果很好地解释了主要岛屿（父岛和哈哈岛）的赏花游客的构成。因此，我们得出的结论是，一种入侵性捕食者（变色龙）改变了小笠原群岛的授粉网络。为了保护本地授粉网络，消灭这种入侵性捕食者应优先于消灭蜜蜂。
Flower visitors recently decreased in the Ogasawara Islands which are subtropical Pacific oceanic islands located 1,000 km south from Japan mainland. The aim of this study was to determine the main cause of this pollinator decline. We assumed four hypothesis, (i) honeybee competition hypothesis, (ii) forest decline hypothesis, (iii) agricultural insecticides hypothesis, and (iv) anole predation hypothesis. They were tested by distribution survey in the field, historical survey using literature, and predation experiment using mesh cages. As a result, the factors affecting the distribution among the islands and the timing of observed declines of native pollinators supported the anole predation hypothesis rather than other hypotheses. In addition, result of experimental predation test well explained the composition of flower visitors in the main islands (Chichi-jima and Haha-jima). So, we concluded that one invasive predator (the anole) has changed the pollination network in the Ogasawara Islands. To conserve the native pollination network, eradication of this invasive predator should take priority over the eradication of honeybees.