Status of the Least Grebe Tachybaptus dominicus in the United States Virgin Islands
Status of the Least Grebe Tachybaptus dominicus in the United States Virgin Islands
复制标题
美属维尔京群岛最小鷊鷉鷉鷉的现状
DOI：
--
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
F. E. Hayes
中科院分区：
文献类型：
--
作者：
D. B. Mcnair;L. D. Yntema;F. E. Hayes
抽象。
自2002年以来，本区域濒危的小（Tachybaptus dominicus）在美属维尔京群岛的三个主要岛屿（圣克鲁瓦、圣约翰、圣托马斯）筑巢。单对（偶尔两对）已被证实筑巢在五个人造淡水池塘和两个盐池在圣克鲁瓦，在五个淡水池塘在圣托马斯，并在一个淡水池塘在圣约翰。从2004年到2007年，圣克鲁瓦七个地点中有六个发生了繁殖，这是在平均或高于平均的年降雨量之后发生的，包括四次秋季风暴（2003年11月、2004年9月、2005年10月、2006年10月）带来的暴雨，这些暴雨充满了淡水池塘和盐池。最小的对半永久性湿地的水位变化反应迅速，可以全年繁殖;一对试图在圣克鲁瓦的温莎北池塘筑巢至少20次（8次成功）。美属维尔京群岛的非繁殖鸟类在其他淡水池塘和一些微咸的盐池中出现的频率较低，在那里它们也有有限的分布。在大安的列斯群岛繁殖范围的东部边缘，美属维尔京群岛的最小种群数量普遍较低。直到最近，由于采样工作不足，人工淡水池塘的繁殖可能一直被USVI忽视。未来的调查应侧重于选定的人工淡水池塘和半咸水盐池时，水位是足够的，特别是在圣约翰，鸟类可能已经在盐池报告不足，因为采样工作。
Abstract.
The regionally endangered Least Grebe (Tachybaptus dominicus) has nested on the three main islands (St. Croix, St. John, St. Thomas) on the United States Virgin Islands (USVI) since 2002. Single pairs (occasionally two pairs) have been confirmed nesting at five man-made freshwater ponds and two salt ponds on St. Croix, at five freshwater ponds on St. Thomas, and at one freshwater pond on St. John. Breeding occurred at six of seven sites on St. Croix from 2004 into 2007 after average, or above-average annual rainfall including torrential rainfall from four autumnal storms (November 2003, September 2004, October 2005, October 2006) that filled freshwater ponds and salt ponds. Least Grebes respond rapidly to water level changes at semi-permanent wetlands and can breed year-round; one pair attempted to nest at least 20 times (eight successfully) at Windsor North Pond on St. Croix. Non-breeding birds in the USVI have occurred less frequently at other freshwater ponds and a few brackish salt ponds, where they also have a restricted distribution. Least Grebe populations in the USVI, at the eastern edge of their breeding range in the Greater Antilles, are generally low. Breeding at man-made freshwater ponds has probably been overlooked in the USVI until recently because of insufficient sampling effort. Future surveys should focus on selected manmade freshwater ponds and brackish salt ponds when water levels are adequate, especially on St. John where birds may have been underreported at salt ponds because of insufficient sampling effort.