Ecosystem management on Amami Island, considering community processes.

奄美大岛位于九州岛西南约300公里处。，以及东方大区东北边缘。这里有许多特有的物种，如五角星、芦笋、大Zoothera和巴比纳。20世纪90年代外来的爪哇Herpestes javanicus扩大了在本岛的分布范围，在这种外来捕食哺乳动物的高密度区，许多特有动物物种数量减少甚至消失。自2000年以来，日本环境省一直在控制爪哇鼠的数量，目标是将其从该岛消灭。森林中有时会有外来的Rattus Rattus，通常是黄家鼠的重要冬季猎物。黄家鼠种群的变化也可能通过rattus和其他中间捕食者对下层捕食物种产生间接影响。橡子和鼠的数量每年都有波动，一些本地动物以橡子为食。奄美岛的森林生态系统是动态的、复杂的。了解它的过程很有趣，对保护自然也很重要。我们调查了动物密度、观测和假设的食物网，并从生态系统恢复措施的角度提出了其保护问题。

Amami-oshima Island locates about 300km south-west from Kyushu Is., and north-eastern edge of Oriental Region. There are many endemic species, such as Pentalagus furnessi, Garrulus Iidthi, Zoothera major, and Babina subaspera. In 1990's alien Herpestes javanicus expanded its distribution within this Island, and in the high density area of this alien predator mammal, the number of many endemic animal species has decreased or even disappeared. Ministry of the Environment, Japan, has been controlling H.javanicus population since 2000 and targeting its eradication from this island. There are sometimes alien Rattus rattus in the forest, which is usually an important winter prey of H.javanicus. There may be also some indirect effects of H.javanicus population change through R.rattus and other intermediate native predators on the lower prey species. There are annual fluctuation of acorns and R.rattus and several native animals depend on acorns much. The ecosystem of the forest on Amami Island is dynamic and complicated. Understanding its processes is interesting and important to conserve the nature. We investigated the animal density, observed and hypothetic food web, and present problems of its conservation in terms of the ecosystem restoration measurements.