Burrowing Owl nest success and burrow longevity in north central Oregon
Burrowing Owl nest success and burrow longevity in north central Oregon
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俄勒冈州中北部的穴居猫头鹰筑巢成功和洞穴寿命
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
K. Livezey
中科院分区：
文献类型：
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作者：
A. Holmes;G. Green;Russell L. Morgan;K. Livezey
从1995年到1997年，我们研究了俄勒冈州中北部迁徙种群的巢成功率、洞穴寿命和洞穴重用率。筑巢成功率每年从50%到67%不等。巢失败的主要原因是遗弃(26%)和獾(红豆杉；13%)的掠夺。在接下来的几年中，重复利用现有的巢穴和卫星洞穴的比例在1996年为87%，在1997年为57%。在沙质土壤中，巢穴的重复利用率最高，这可能表明巢址的可用性在沙质土壤类型中是一个限制因素。从一个季节到下一个季节，被牲畜践踏导致的洞穴损失了24%，自然侵蚀导致了17%的封闭。由于土壤的易碎性，这两种洞穴失败的原因更多地发生在含有沙子成分的土壤中。我们建议对家畜栖息地进行评估，以供穴居猫头鹰使用，对被占领地区进行管理，将家畜对洞穴的破坏降至最低，并修订捕食者控制措施，以排除獾的死亡。
We studied nest success, burrow longevity, and rates of burrow reuse for a migratory population of Bur- rowing Owl (Athene cunictdaria) in north central Oregon from 1995 to 1997. Nest success varied annually from 50% to 67%. Principal causes of nest failure were desertion (26%) and depredation by badgers (Taxidea taxus ; 13%). Reuse of available nest and satellite burrows in subsequent years was 87% in 1996 and 57% in 1997. Reuse was highest at bur- rows in sandy soils, which may indicate that nest-site availability is a limiting factor in sandier soil types. Trampling by livestock resulted in the loss of 24% of all burrows between one season and the next, and natural erosion resulted in clo- sure of 17%. Both causes of burrow failure occurred more frequently in soils with a sand component due to their friable nature. We recommend that habitat used by livestock be evaluated for use by Burrowing Owls, that occupied areas be managed to minimize destruction of burrows by livestock, and that predator-control efforts be revised to exclude mortal- ity of badgers.