Distribution of grizzly bears in the Greater Yellowstone Ecosystem in 2004

被引:0
|
作者
Schwartz, CC [1 ]
Haroldson, MA
Gunther, KA
Moody, D
机构
[1] Montana State Univ, US Geol Survey, No Rocky Mt Sci Ctr, Interagcy Grizzly Bear Study Team,Forestry Sci La, Bozeman, MT 59717 USA
[2] Bear Management Off, Yellowstone Natl Pk, WY 82190 USA
[3] Wyoming Game & Fish Dept, Trophy Game Sect, Lander, WY 82520 USA
关键词
distribution; grizzly bear; kernel density; range analysis; Ursus arctos; Yellowstone ecosystem;
D O I
10.2192/1537-6176(2006)17[63:DOGBIT]2.0.CO;2
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
The US Fish and Wildlife Service (USFWS) proposed delisting the Yellowstone grizzly bear (Ursus arctos horribilis) in November 2005. Part of that process required knowledge of the most current distribution of the species. Here, we update an earlier estimate of occupied range (1990-2000) with data through 2004. We used kernel estimators to develop distribution maps of occupied habitats based on initial sightings of unduplicated females (n = 481) with cubs of the year, locations of radiomarked bears (n = 170), and spatially unique locations of conflicts, confrontations, and mortalities (n = 1,075). Although each data set was constrained by potential sampling bias, together they provided insight into areas in the Greater Yellowstone Ecosystem (GYE) currently occupied by grizzly bears. The current distribution of 37,258 km(2) (1990-2004) extends beyond the distribution map generated with data from 1990-2000 (34,416 km(2)). Range expansion is particularly evident in parts of the Caribou-Targhee National Forest in Idaho and north of Spanish Peaks on the Gallatin National Forest in Montana.
引用
收藏
页码:63 / 66
页数:4
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