Winter Surveys for Mexican Spotted Owls with Audio Recorders

Q4 Agricultural and Biological Sciences Western Birds Pub Date : 2022-11-01 DOI:10.21199/wb53.4.3
Brent Carl Hetzler
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Abstract

Monitoring Mexican Spotted Owls (Strix occidentalis lucida) in and near breeding territories during winter has practical value but has not been previously studied by passive techniques, including acoustic recorders. Such information could inform breeding survey strategies as well as identify new breeding pairs. The U.S. Fish and Wildlife Service’s standard survey protocol, entailing four nighttime visits to a site and listening for a response to broadcast calls, has limitations in winter, when nonbreeding owls are less likely to respond and multiple visits may not be possible. Instead, I tested the feasibility of using passive sound-recording equipment to detect the owl in winter, deploying audio recorders at two known nesting sites in northern Arizona over 6 months through winter 2014–2015. As a result, I recorded spontaneous calls during each month of the survey. Paired males and females called to each other in winter, and the variation in frequency of calling through the night paralleled the pattern found in previous studies. My data suggest that automated audio detection provides a reliable tool for continuous, high-resolution, long-term, and cost-effective monitoring of the Mexican Spotted Owl, in both winter and summer.
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用录音机对墨西哥斑点猫头鹰的冬季调查
在冬季监测墨西哥斑点猫头鹰(Strix occidentalis lucida)在繁殖区域及其附近具有实用价值,但以前没有通过被动技术(包括声学记录仪)进行过研究。这些信息可以为育种调查策略提供信息,并确定新的育种配对。美国鱼类和野生动物管理局(U.S. Fish and Wildlife Service)的标准调查程序需要在一个地点进行四次夜间访问,并听取对广播呼叫的反应,但在冬季有局限性,因为非繁殖猫头鹰不太可能做出反应,而且多次访问可能是不可能的。相反,我测试了使用被动录音设备在冬季探测猫头鹰的可行性,在2014-2015年冬季的6个月里,我在亚利桑那州北部的两个已知筑巢点部署了录音机。因此,我在调查的每个月都录下了自发的电话。冬天成对的雄性和雌性会互相鸣叫,夜间鸣叫频率的变化与之前的研究发现的模式相似。我的数据表明,自动音频检测为墨西哥斑点猫头鹰在冬季和夏季的连续、高分辨率、长期和经济有效的监测提供了可靠的工具。
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来源期刊
Western Birds
Western Birds Agricultural and Biological Sciences-Animal Science and Zoology
CiteScore
0.60
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