Long-billed curlew (Numenius americanus) and burrowing owl (Athene cunicularia) populations in the BLM Four Rivers Field Office. 2011 Annual Report

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This report summarizes 2011 efforts to assess long-billed curlew (Numenius americanus) and burrowing owl (Athene cunicularia) populations in the BLM Four Rivers Field Office in southwest Idaho. This includes widespread surveys for curlews and owls throughout the field office as well as an intensive survey for curlews within the Long-billed Curlew Area of Critical Environmental Concern (ACEC). Both species are identified as a Species of Greatest Conservation Need in the Idaho Comprehensive Wildlife Conservation Strategy and as Watch List Species by BLM and are thus of particular interest to wildlife management agencies. Curlews and owls were detected at 14% and 7% of points, respectively, within Four Rivers. In 2011, the average density of adult curlews within the ACEC was 0.83 birds/km2, whereas curlew density in the greater Four Rivers area was only 0.32 birds/km2. An average of 0.08 burrowing owls were detected per point/survey in the Four Rivers area. The estimated population size of adult curlews within Four Rivers was 7,132 adults.

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ELECTRONIC FILE - Zoology: Birds

SWAP (2/19/2016) citation (changed for punctuation):
Moulton C. 2012. Long-billed curlew (Numenius americanus) and burrowing owl (Athene cunicularia) populations in the BLM Four Rivers Field Office. 2011 Annual Report. Boise (ID): Idaho Department of Fish and Game. 12 p.