期刊
JOURNAL OF WILDLIFE MANAGEMENT
卷 66, 期 4, 页码 976-984出版社
WILDLIFE SOC
DOI: 10.2307/3802930
关键词
call-response survey; double-brood; Ixobrychus exilis; least bittern; New York; radiotelemetry
We determined the effectiveness of broadcasting recordings of conspecific vocalizations (call-response surveys) for monitoring least bittern (Ixobrychus exilis) populations within an 8,000-ha wetland complex in western New York, USA, during 2000. Call-response trials on 15 radiomarked males increased least bittern calling (25.4% of trials) compared to passive listening (9.5%; P= 0.010), and response to broadcasts was higher near nest initiation (46.9% of trials) versus incubation (11. 1 %) and hatching (11. 1 %; P < 0.005). Call-response surveys are all effective monitoring tool for least bitterns, but surveys should be conducted when most birds are initiating nests. Response rates also can be used to estimate true abundance of male least bitterns in a marsh.
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