Wildfire and desert bighorn sheep habitat, Santa Catalina Mountains, Arizona
Wildfire and desert bighorn sheep habitat, Santa Catalina Mountains, Arizona
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DOI：
10.1894/0038-4909(2005)050
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发表时间：
2005-12-01
影响因子：
0.2
通讯作者：
Krausman, PR
中科院分区：
文献类型：
--
作者：
Cain, JW;Johnson, HE;Krausman, PR
自20世纪20年代以来，亚利桑那州圣卡塔利娜山脉的沙漠大角羊（Ovis canadensis mexicana）数量一直在下降，并在20世纪90年代末几乎灭绝。城市发展、人类娱乐活动以及由于野火抑制而导致的栖息地条件的变化导致了这种下降。2002年和2003年的野火烧毁了圣卡塔利娜山脉约46,701公顷的土地，包括以前居住在沙漠大角羊的地区。我们的目标是估计圣卡塔利娜山脉潜在和历史大角羊栖息地的数量，并确定火灾是否改善了大角羊的栖息地质量。建立了空间生境适宜性模型，估算了潜在生境和历史生境的数量。可用于圣卡塔利娜山脉的大角羊。然后，我们使用烧伤严重程度图和归一化植被指数来检查最近的野火对大角羊栖息地的影响。荒漠大角羊的潜在栖息地面积为39,201 ha，历史栖息地面积为9,017 ha。自1989年以来，圣卡塔利娜山脉西部历史上的大角羊栖息地减少了64%。大约21%的潜在栖息地和24%的历史大角羊栖息地在火灾中被烧毁，其中大多数经历了低程度的烧伤，不足以清除减少栖息地的植被。品质为沙漠。大角羊。任何将沙漠大角羊迁移到圣卡塔利娜山脉的考虑都应该进一步评估被确定为潜在栖息地的地区的适宜性。
The desert bighorn sheep (Ovis canadensis mexicana) population in the Santa Catalina Mountains, Arizona, has declined since the 1920s and was virtually extirpated in the late 1990s. Urban development, human recreation, and changes in habitat conditions due to wildfire suppression have contributed to the decline. Wildfires in 2002 and 2003 burned approximately 46,701 ha in the Santa Catalina Mountains, including areas previously inhabited by desert bighorn sheep. Our objectives were to estimate the amount of potential and historical bighorn sheep habitat in the Santa Catalina Mountains and to determine if the fires improved habitat quality for bighorn sheep. We created a spatial habitat suitability model to estimate the amount of potential and historical habitat. available for bighorn sheep in the Santa Catalina Mountains. We then used Burn Severity maps and the Normalized Difference Vegetation Index to examine the impact of recent wildfires on bighorn sheep habitaL. We calculated 39,201 and 9,017 ha of potential and historical habitat of desert bighorn sheep, respectively. Historical bighorn sheep habitat in the western Santa Catalina Mountains declined 64% since 1989. Approximately 21% of potential habitat and 24% of historical bighorn sheep habitat were burned during the fires, most of which experienced low burn severity that was not high enough to remove vegetation that decreases habitat. quality for desert. bighorn sheep. Any consideration of translocation of desert bighorn Sheep to the Santa Catalina Mountains should further assess the suitability of the areas identified as potential habitat.