Recent status and trends of the land bird avifauna on Saipan, Mariana Islands, with emphasis on the endangered Nightingale Reed-warbler Acrocephalus luscinia
Recent status and trends of the land bird avifauna on Saipan, Mariana Islands, with emphasis on the endangered Nightingale Reed-warbler Acrocephalus luscinia
复制标题
DOI：
10.1017/s0959270909008417
复制
发表时间：
2009-12-01
影响因子：
1.6
通讯作者：
Williams, Laura L.
中科院分区：
文献类型：
--
作者：
Camp, Richard J.;Pratt, Thane K.;Williams, Laura L.
马里亚纳群岛是西太平洋的一个群岛，其鸟类面临着经济快速发展和非本地物种扩散的威胁，特别是一种毁灭性的捕食者-棕树蛇Boiga irregularis。在本文中，我们研究的地位和趋势的陆地鸟类区系的塞班岛为基础的石油三个全岛范围内的调查，在1982年，1997年和2007年进行。在此期间，人口石油塞班岛增加了四倍以上，大部分岛屿已开发。调查采用基于距离抽样的标准点横断面方法。值得注意的是，我们发现几乎所有的陆地鸟类物种-- 11种本地物种和3种引进物种--都很常见或丰富。唯一的例外是马达加斯加的Megapodius laperouse，这是一种历史上罕见的物种，在2007年的调查中没有观察到，尽管它确实在塞班岛和其他马里亚纳群岛上存在。三次调查的物种密度比较表明，7种主要是水果和种子的食虫鸟类增加了，3种食虫鸟类减少了，它们是棕扇尾Rhipidura rufifrons，夜莺苇莺Acrocephalus luscinia和金绣眼Cleptornis marchei。在这三种鸟类中，夜莺苇莺被世界自然保护联盟红色名录列为“濒危”物种，并被美国鱼类和野生动物管理局列为濒危物种。塞班岛上的苇莺密度在1982年至2007年间减少了一半以上。虽然点样带取样对这一物种很有效，但通过在生境之间重新分配取样站和更频繁地取样，可以改善密度估计和趋势评估。
The avifauna of the Mariana Islands, an archipelago in the western Pacific, faces the threats of rapid economic development and the spread of non-native species, particularly a devastating predator, Brown Tree Snake Boiga irregularis. In this paper, we examine the Status and trends of the land bird fauna of Saipan Island based oil three island-wide surveys conducted in 1982, 1997, and 2007. During this period, the human population oil Saipan increased more than four-fold and much of the island has been developed. The surveys employed standard point-tran sect methods based oil Distance Sampling. Remarkably, we found nearly all species of land birds - 11 native species and three introduced species - to be common or abundant. The exception was the Micronesian Megapode Megapodius laperouse, a historically rare species that was not observed on the 2007 Survey, although it does persist on Saipan and other Mariana islands. A comparison of species densities among the three surveys showed that seven species, Mainly fruit and seed-eaters, had increased and three species of insectivorous birds had decreased - Rufous Fantail Rhipidura rufifrons, Nightingale Reed-warbler Acrocephalus luscinia, and Golden White-eye Cleptornis marchei. Of these three, Nightingale Reed-warbler is listed as 'Endangered' oil the IUCN Red List and as an Endangered Species by the U.S. Fish and Wildlife Service. Reed-warbler densities on Saipan decreased by more than half between 1982 and 2007. Although point transect sampling worked well for this species, density estimates and trends assessment could be improved by reallocating sampling stations among habitats and by more frequent sampling.