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Yellow-Billed Cuckoo Distribution, Abundance, and Habitat Use Along the Lower Colorado and Tributaries, 2006 Annual Report.

PB2008108585

Publication Date	2007
Personal Author	Johnson, M. J.; Holmes, J. A.; Calvo, C.; Samuels, I.; Krantz, S.; Sogge, M. K.
Page Count	220
Abstract	This 2006 annual report details the first season of a 2-year study documenting western yellow-billed cuckoo (Coccyzus americanus occidentalis) distribution, abundance, and habitat use throughout the Lower Colorado River Multi-Species Conservation Plan boundary area. We conducted cuckoo surveys at 55 sites within 17 areas, between 11 June and 13 September. The 243 visits across all sites yielded 180 yellow-billed cuckoo detections. Cuckoos were detected at 27 of the 55 sites, primarily at the Bill Williams River National Wildlife Refuge AZ sites (n = 117 detections) and the Grand Canyon National Park-Lake Mead National Recreation Area AZ delta sites (n = 29 detections). There were also cuckoos at the Gila River-Colorado River Confluence, AZ (n = 9), Overton Wildlife Management, NV area (n = 7), and Limitrophe Division North, AZ (n = 6); however, at these sites the numbers were much lower and very few of these birds were considered to be paired or breeding. The greatest number of detections (n = 79) occurred during the second survey period (3-23 July). In 2006, we confirmed five breeding events, including one nesting observation and sightings of four juveniles; all confirmed breeding was at the Bill Williams River NWR and Grand Canyon NP-Lake Mead NRA delta sites.
Keywords	Birds Distribution Abundance Habitat Surveys Wildlife management Bird populations Natural resources conservation Species diversity Nesting Breeding Colorado River Detection Yellow-billed Cuckoo(YBCU) Coccyzus americanus occidentalis
Source Agency	US Geological Survey
Corporate Authors	Southwest Biological Science Center, Flagstaff, AZ.; Bureau of Reclamation, Boulder City, NV.; Geological Survey, Reston, VA.
Supplemental Notes	Sponsored by Geological Survey, Reston, VA. and Bureau of Reclamation, Boulder City, NV.
Document Type	Technical Report
Title Note	Open file rept.
NTIS Issue Number	200817

Yellow-Billed Cuckoo Distribution, Abundance, and Habitat Use Along the Lower Colorado and Tributaries, 2006 Annual Report.

Yellow-Billed Cuckoo Distribution, Abundance, and Habitat Use Along the Lower Colorado and Tributaries, 2006 Annual Report.
PB2008108585

Publication Date	2007
Personal Author	Johnson, M. J.; Holmes, J. A.; Calvo, C.; Samuels, I.; Krantz, S.; Sogge, M. K.
Page Count	220
Abstract	This 2006 annual report details the first season of a 2-year study documenting western yellow-billed cuckoo (Coccyzus americanus occidentalis) distribution, abundance, and habitat use throughout the Lower Colorado River Multi-Species Conservation Plan boundary area. We conducted cuckoo surveys at 55 sites within 17 areas, between 11 June and 13 September. The 243 visits across all sites yielded 180 yellow-billed cuckoo detections. Cuckoos were detected at 27 of the 55 sites, primarily at the Bill Williams River National Wildlife Refuge AZ sites (n = 117 detections) and the Grand Canyon National Park-Lake Mead National Recreation Area AZ delta sites (n = 29 detections). There were also cuckoos at the Gila River-Colorado River Confluence, AZ (n = 9), Overton Wildlife Management, NV area (n = 7), and Limitrophe Division North, AZ (n = 6); however, at these sites the numbers were much lower and very few of these birds were considered to be paired or breeding. The greatest number of detections (n = 79) occurred during the second survey period (3-23 July). In 2006, we confirmed five breeding events, including one nesting observation and sightings of four juveniles; all confirmed breeding was at the Bill Williams River NWR and Grand Canyon NP-Lake Mead NRA delta sites.
Keywords	Birds Distribution Abundance Habitat Surveys Wildlife management Bird populations Natural resources conservation Species diversity Nesting Breeding Colorado River Detection Yellow-billed Cuckoo(YBCU) Coccyzus americanus occidentalis
Source Agency	US Geological Survey
Corporate Authors	Southwest Biological Science Center, Flagstaff, AZ.; Bureau of Reclamation, Boulder City, NV.; Geological Survey, Reston, VA.
Supplemental Notes	Sponsored by Geological Survey, Reston, VA. and Bureau of Reclamation, Boulder City, NV.
Document Type	Technical Report
Title Note	Open file rept.
NTIS Issue Number	200817