American white pelican
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| American white pelican | |
|---|---|
| Name | American white pelican |
| Status | LC |
| Status system | IUCN3.1 |
| Genus | Pelecanus |
| Species | erythrorhynchos |
| Authority | Gmelin, 1789 |
American white pelican The American white pelican is a large North American waterbird notable for its expansive wingspan and distinctive white plumage with black primary feathers. It is a colonial species that nests inland and forages cooperatively on freshwater and coastal waters, and is recognized in field guides and conservation literature across institutions.
Taxonomy and classification
The species is placed in the genus Pelecanus and was described by Johann Friedrich Gmelin in 1789; its taxonomic history has been addressed by authorities including the International Ornithologists' Union and the American Ornithological Society. Molecular studies comparing mitochondrial and nuclear markers have been discussed in journals such as The Auk and Molecular Phylogenetics and Evolution, and phylogenetic relationships relate it to other pelican species treated by researchers affiliated with the Smithsonian Institution and the Natural History Museum, London. The species epithet derives from Latin descriptive practices used during the era of Carl Linnaeus and the Linnaean system adopted by many museums including the American Museum of Natural History.
Description
Adults measure large dimensions often compared in field measurements compiled by the Cornell Lab of Ornithology and illustrated in plates of the National Audubon Society field guide. Plumage is predominantly white with black primaries visible in flight, and adults develop an orange bill and a keratinous frontal plate during breeding, traits described in species accounts by the British Ornithologists' Union and regional bird atlases such as those produced by the Canadian Wildlife Service. Wingspan and mass ranges are reported in handbooks like the Handbook of the Birds of the World and by researchers reporting banding data to the US Geological Survey. Juveniles resemble adults but show mottled brown and gray as noted in the publications of the North American Bird Conservation Initiative.
Distribution and habitat
Breeding colonies occur across the interior of North America with major sites in regions catalogued by the U.S. Fish and Wildlife Service and the Canadian Wildlife Service, while wintering distributions extend to coastal areas monitored by organizations such as the Audubon Society and state wildlife agencies like California Department of Fish and Wildlife. Important breeding lakes and wetlands have been identified in inventories conducted by the Bureau of Land Management, the National Park Service, and provincial agencies including Alberta Environment and Parks. Range maps in conservation assessments reference datasets from the IUCN Red List and migratory routes tracked by projects run by the University of Minnesota and the Bird Conservancy of the Rockies.
Behavior and ecology
This species exhibits cooperative foraging documented in behavioral studies published by researchers at institutions such as University of Wisconsin–Madison and University of California, Davis. Foraging techniques include group herding in shallow waters, with diet studies reported by scientists affiliated with the Fish and Wildlife Service and university ecology departments. Migration timing and stopover ecology have been analyzed using banding records maintained by the Canadian Migration Monitoring Network and telemetry projects funded by agencies including the National Science Foundation. Predation and interspecific interactions are included in regional natural history accounts produced by state natural heritage programs and the Royal Ontario Museum.
Breeding and life cycle
Colonial nesting occurs on islands and isolated shorelines described in management plans produced by the U.S. Fish and Wildlife Service and provincial conservation bodies. Clutch size, incubation, and chick development parameters are reported in longitudinal studies housed at the Cornell Lab of Ornithology and in monographs from the American Ornithologists' Union. Parental care, fledging periods, and age at first breeding are topics covered in theses and peer-reviewed articles from universities such as Montana State University and University of Alberta, and ringing recoveries informing longevity records are archived by the Bird Banding Laboratory.
Conservation and threats
The species is assessed as Least Concern by the IUCN Red List, but local populations face threats documented by the U.S. Fish and Wildlife Service, Environment and Climate Change Canada, and conservation NGOs like the National Audubon Society. Threats include habitat alteration from projects overseen by the U.S. Army Corps of Engineers and pollution incidents investigated by agencies such as the Environmental Protection Agency and provincial ministries. Management responses include protected area designation by the National Wildlife Refuge System, restoration initiatives by the Nature Conservancy, and monitoring programs coordinated with the North American Waterfowl Management Plan partners. Conservation literature in journals such as Conservation Biology and reports from the World Wildlife Fund address ongoing research needs and mitigation strategies.