Potential role of frugivorous birds in the recovery process of forest vegetation after feral goat eradication in Mukojima Island, the Bonin Islands
Potential role of frugivorous birds in the recovery process of forest vegetation after feral goat eradication in Mukojima Island, the Bonin Islands
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DOI：
10.1007/s10310-011-0300-7
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发表时间：
2012-08-01
影响因子：
1.5
通讯作者：
Sone, Koichi
中科院分区：
文献类型：
--
作者：
Emura, Naoko;Kawakami, Kazuto;Sone, Koichi
一些引进的食果鸟类传播引进的植物，因此是灭绝的本地鸟类的替代品。引进的鸟类对当地生态系统有负面和/或偶尔的正面影响。了解本地和引进的食果植物和植物物种之间的关系对生态系统的管理很重要。在这项研究中，我们阐明了这些关系在Mukojima岛，小笠原群岛，那里是人类学砍伐和日本白眼Zosterops和一些植物已经引入。我们研究了食果鸟类的栖息地选择，鸟类粪便中实际分散的种子，以及潜在分散的植物物种的分布。日本绣眼鸟和本地的蓝岩鸫Monticola solitarius在这个岛上占主导地位。前者主要利用林区，散布的种子较小，经常引入植物种子。后者主要利用开阔地，散布大小种子。一些小种子植物不仅在森林中出现，而且在开阔地也有。它们的幼苗比大种子物种分布在离成年树更远的地方。这表明小种子植物比大种子植物传播得更广，因为这两种鸟类在不同的环境中传播种子。这种引进的鸟类物种可能是重要的植被恢复，虽然它可能有助于在这个岛上的引进植物的分布。
Some introduced frugivorous birds disperse introduced plants and are thus a substitute for extinct native birds. Introduced birds have negative and/or infrequently positive effects on local ecosystems. It is important for management of the ecosystems to understand the relationships between native and introduced frugivorous and plant species. In this study, we elucidated these relationships in Mukojima Island, the Bonin Islands, where was anthropologically deforested and Japanese White-eye Zosterops japonicus and some plants were already introduced. We examined the habitat selection of frugivorous birds, actual dispersed seeds in bird feces, and the distribution of the potentially dispersed plant species. The Japanese White-eye and the native, Blue Rockthrush Monticola solitarius, were dominant on this island. The former mainly used the forest area and dispersed only small seeds and frequently introduced plant seeds. The latter mainly used the open area and dispersed both small and large seeds. Some small-seed plants occurred not only in the forest but also in the open area. Their seedlings were distributed farther from their adult trees than the large-seed species. These indicate that small-seed plants would be more spread than the large-seed plants because the two bird species disperse their seeds in different environments. This introduced bird species may be important in vegetation recovery, although it may contribute to the distribution of introduced plants on this island.