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| western yellow-billed cuckoo | |
|---|---|
| Name | Western yellow-billed cuckoo |
| Genus | Coccyzus |
| Species | americanus |
| Subspecies | occidentalis |
| Authority | (Baird, 1858) |
western yellow-billed cuckoo is a subspecies of Coccyzus americanus formerly treated as a separate taxon, notable for its association with riparian corridors in western North America and for recent concerns raised by conservation entities such as U.S. Fish and Wildlife Service, NatureServe, and International Union for Conservation of Nature. In avian literature tied to institutions like the American Ornithological Society and publications such as The Auk and Condor, it is frequently discussed alongside other migratory taxa monitored by programs like the North American Breeding Bird Survey and treaties including the Migratory Bird Treaty Act. Studies by researchers affiliated with universities such as University of California, Davis, University of Arizona, and agencies like the United States Geological Survey have focused on its ecology, distribution, and the effects of water management policies exemplified by decisions involving the Bureau of Reclamation.
The subspecies occidentalis was described by Spencer F. Baird in 1858 and has been considered in systematic treatments by the American Ornithologists' Union and the SACC; modern molecular phylogenetics using samples housed at institutions like the Smithsonian Institution and analyzed with methods endorsed by the National Science Foundation have informed debates referenced in journals such as Molecular Phylogenetics and Evolution and Journal of Avian Biology. Comparative work contrasts occidentalis with the nominate form described from eastern populations collected during expeditions sponsored by bodies like the United States Exploring Expedition and preserved in collections at the American Museum of Natural History and the Academy of Natural Sciences of Drexel University. Taxonomic treatments by the International Ornithologists' Union reflect shifting perspectives tied to genetic datasets generated using platforms funded by agencies including the National Institutes of Health and computational resources like those at Lawrence Berkeley National Laboratory.
Adults of this subspecies display morphological traits documented in field guides produced by Roger Tory Peterson-influenced series and regional compendia such as those from the Cornell Lab of Ornithology and Audubon Society. Plumage characters, bill coloration, and measurements are routinely recorded following protocols from the Wilson Ornithological Society and are compared against museum specimens curated at Harvard Museum of Comparative Zoology and California Academy of Sciences. Observational standards used by citizen science platforms like eBird and banding schemes run by the United States Geological Survey provide biometric datasets that complement morphological descriptions published in venues such as Birding and regional checklists by the Nevada Bird Records Committee.
Historically concentrated in riparian woodlands of western United States, including river systems managed by agencies like the Army Corps of Engineers and watersheds named for features such as the Colorado River, Sacramento River, and Gila River, the subspecies' range has been mapped in coordination with programs like the North American Bird Conservation Initiative and state natural heritage programs such as California Department of Fish and Wildlife. Habitat associations with gallery forests, willow and cottonwood stands, and floodplain corridors are documented in ecological studies conducted by universities including Oregon State University and organizations like The Nature Conservancy; these studies often reference land-use changes driven by policies from entities like the Bureau of Land Management and local municipalities such as City of Tucson.
Foraging behavior—principally gleaning and sallying for large arthropods including caterpillars targeted in studies funded by the National Science Foundation—is described in field studies published in journals such as Ecology and Journal of Field Ornithology. Seasonal movements link breeding areas with overwintering sites in Central America and South America, and migration research often involves collaboration with international bodies like the Panama Audubon Society and universities including University of Costa Rica; telemetry and isotope approaches coordinated with facilities like Cornell Lab of Ornithology have elucidated stopover ecology relevant to conservation NGOs like BirdLife International. Interactions with brood parasitism, predation, and parasite loads have been examined in the context of community ecology studies conducted by researchers at University of California, Santa Cruz and published in outlets such as Behavioral Ecology.
Breeding biology—nest site selection in riparian trees, clutch size, and fledging parameters—has been monitored via banding and nest monitoring programs run by organizations including Point Reyes Bird Observatory and local Audubon chapters like San Diego Audubon Society. Timing of reproduction correlates with regional phenology documented by climate datasets from National Oceanic and Atmospheric Administration and is affected by hydrological regimes managed by entities such as the U.S. Bureau of Reclamation; these links between flow management and breeding success have been explored in collaborative studies with state agencies like California Department of Water Resources.
The subspecies occidentalis has been the subject of petitions to federal agencies including the U.S. Fish and Wildlife Service and assessments by nongovernmental organizations like Defenders of Wildlife and The Nature Conservancy. Threats include riparian habitat loss from water diversions authorized under statutes like the Reclamation Act, invasive species promoted by international trade governed by bodies such as the World Trade Organization, and climate-driven changes documented by Intergovernmental Panel on Climate Change reports. Conservation measures discussed in recovery planning involve partnerships among federal entities like U.S. Fish and Wildlife Service, state wildlife agencies such as the California Fish and Game Commission, and private landowners coordinated through programs like the Conservation Reserve Program.
Human dimensions of conservation involve stakeholder groups including local tribes such as the Yurok, Hopi, and Tohono O'odham, municipal water managers in cities like Phoenix, Arizona and Los Angeles, and agricultural interests represented by organizations such as the American Farm Bureau Federation. Outreach and education efforts led by nonprofits like the Audubon Society and university extension programs at institutions like University of California Cooperative Extension aim to integrate species conservation with regional planning initiatives such as those by the Metropolitan Water District of Southern California and collaborative landscape efforts supported by foundations like the Gordon and Betty Moore Foundation.