The effects of supplemental perch sites on avian predation and demography of vole populations
The effects of supplemental perch sites on avian predation and demography of vole populations
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补充栖息地对鸟类捕食和田鼠种群数量的影响
DOI：
10.1139/z99-002
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发表时间：
1999
影响因子：
1.4
通讯作者：
Guiming Wang
中科院分区：
文献类型：
--
作者：
J. O. Wolff;Tiffany Fox;R. Skillen;Guiming Wang
我们建立了补充栖息地，以评估其在吸引栖息猛禽的有效性，并确定猛禽访问的增加是否会影响田鼠的人口。我们的模型实验系统由六个0.2公顷的围栏组成，其中包含灰尾田鼠（Microtus canicaudus）。补充栖息地的可用性没有影响北方海鹞，马戏团cyaneus，但在访问美国红隼，Falco sparverius增加了11倍。这种增加的捕食压力并没有影响田鼠种群的大小，增长率，或成人的生存。然而，处理中心的幼仔招募和生殖雌性比例低于对照中心。雄性田鼠的活动范围较小，活动比预期的要少，这可能是对捕食风险的一种回避反应。高密度的田鼠，充分覆盖的治疗网站，以及良好的觅食区，在周围的栖息地覆盖较少，可能否定了供应的影响。
We erected supplemental perches to evaluate their effectiveness in attracting perching raptors and to determine if an increase in raptor visitation could affect vole demography. Our model experimental system consisted of six 0.2-ha enclosures containing gray-tailed vole, Microtus canicaudus. The availability of supplemental perch sites had no effect on northern harriers, Circus cyaneus, but resulted in an 11-fold increase in visitation by American kestrels, Falco sparverius. This increased predation pressure did not affect vole population size, growth rate, or adult survival. However, juvenile recruitment and the proportion of reproductive females were lower in treatment sites than in control sites. Male voles had smaller home ranges and were less active than expected, which may have been an avoidance response to predation risk. High densities of voles, adequate cover in treatment sites, and good foraging areas with less cover in surrounding habitat may have negated the effects of the availability of supp...