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Factors affecting the detection of elf owls and western screech owls
Hardy, PC; Morrison, ML
通讯作者Hardy, PC
来源期刊WILDLIFE SOCIETY BULLETIN
ISSN0091-7648
出版年2000
卷号28期号:2页码:333-342
英文摘要

Although elf owls (Micrathene whitneyi) and western screech owls (Otus kennicotti) are of management interest because of their potential to serve as barometers of environmental change, factors affecting the detection of these species have not been quantified. We conducted point counts for elf owls and western screech owls from 1994 to 1996 in the Sonoran Desert, southwestern Arizona. We assessed whether owls were more detectable when broadcasts were used than when they were not, and how temporal, lunar, weather, and biological variables affected detection rates. We assessed factors that potentially varied within a night (weather, time, presence of other owls) separately from those that did not vary within a night (date, moon phase). Elf owls and western screech owls were more likely (P<0.001) to be detected when conspecific broadcasts were used than when broadcasts were not used. Within the breeding season, detection rates of elf owls were greatest during the late advertising period (11 April to 30 April) between the first-quarter and third-quarter moon phases. Detection rates of screech owls did not differ among moon phases or dates (P>0.40). Controlling for moon phase and date, elf owls were most frequently detected during calm (wind <5 mph), moonlit conditions. Increased detection rates of western screech owls were associated with decreased wind speed, temperature, and cloud cover. We recommend that conspecific broadcasts be used during surveys to increase detection rates for both species. Elf owls should be surveyed during the late advertising period between the first-quarter and third-quarter moon.


英文关键词broadcast surveys detection rates elf owl Micrathene whitneyi moon phase Otus kennicottii Sonoran Desert western screech owl
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000087990800006
WOS关键词VOCALIZATIONS ; BROADCAST ; BEHAVIOR ; ARIZONA
WOS类目Biodiversity Conservation
WOS研究方向Biodiversity & Conservation
来源机构University of Arizona ; E18
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/140114
作者单位(1)Univ Arizona, Program Wildlife & Fisheries Sci, Sch Renewable Nat Resources, Tucson, AZ 85721 USA
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GB/T 7714
Hardy, PC,Morrison, ML. Factors affecting the detection of elf owls and western screech owls[J]. University of Arizona, E18,2000,28(2):333-342.
APA Hardy, PC,&Morrison, ML.(2000).Factors affecting the detection of elf owls and western screech owls.WILDLIFE SOCIETY BULLETIN,28(2),333-342.
MLA Hardy, PC,et al."Factors affecting the detection of elf owls and western screech owls".WILDLIFE SOCIETY BULLETIN 28.2(2000):333-342.
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