Population decline of the Elfin-woods Warbler Setophaga angelae in eastern Puerto Rico

被引:5
作者
Arendt, Wayne J. [1 ]
Qian, Song S. [2 ]
Mineard, Kelli A. [2 ]
机构
[1] US Forest Serv, USDA, Int Inst Trop Forestry, Sabana Field Res Stn, Luquillo, PR 00773 USA
[2] Duke Univ, Nicholas Sch Environm & Earth Sci, Durham, NC 27708 USA
关键词
LUQUILLO MOUNTAINS; FOREST STRUCTURE; STATE FOREST; WOODLAND; GROWTH;
D O I
10.1017/S0959270913000166
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
We estimated the population density of the globally threatened Elfin-woods Warbler Setophaga angelae within two forest types at different elevations in the Luquillo Experimental Forest in north-eastern Puerto Rico. Population densities ranged from 0.01 to 0.02 individuals/ha in elfin woodland and 0.06-0.26 individuals/ha in palo colorado forest in 2006, with average rates of decline since 1989 of 0.002-0.01 and 0.003-0.06 individuals/ha respectively. These estimates show a significant general declining trend from c.0.2 individuals/ha in 1989 in elfin woodland to c.0.02/ha in 2006, and from 1 to 0.2 in palo colorado forest. Although variation in estimated population density depended on the statistical method used, we document and discuss possible causes of an overall population decline from 1989 to 2006, lending support to previous initiatives to reclassify the species from the IUCN Red List category of "Vulnerable" to "Endangered".
引用
收藏
页码:136 / 146
页数:11
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