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| American coot | |
|---|---|
| Name | American coot |
| Status | LC |
| Status system | IUCN3.1 |
| Genus | Fulica |
| Species | americana |
| Authority | Gmelin, 1789 |
American coot is a medium-sized waterbird in the rail family known for its slate-gray plumage, white bill, and lobed toes. Widely distributed across North and Central America, it frequents wetlands, lakes, and coastal marshes and is notable for its gregarious flocks, aggressive territoriality, and diverse diet. The species is well-studied in ornithological, ecological, and conservation literature.
The species was described in the late 18th century and placed in the genus Fulica, within the family Rallidae, related to rails studied by naturalists such as Alexander Wilson, John James Audubon, and Thomas Say. Morphological comparisons with congeners like the Eurasian coot and measurements recorded by institutions including the Smithsonian Institution and the American Museum of Natural History show adult length typically around 34–43 cm, a wingspan near 64–75 cm, and a weight range overlapping that of some mallard populations. Distinguishing field marks include the white frontal shield and bill; seasonal variation and juvenile plumage are described in regional field guides from the National Audubon Society and the Royal Ontario Museum. Phylogenetic analyses using mitochondrial DNA datasets published in journals associated with the Linnean Society and researchers at the University of California have clarified relationships within Fulica and related rallids.
The species breeds across much of the continental United States, southern Canada, and parts of Central America, with wintering populations extending to Mexico, the Caribbean, and northern South America. Migratory routes and staging areas have been documented in studies coordinated by the US Fish and Wildlife Service, the Canadian Wildlife Service, and networks such as eBird. Habitats include freshwater lakes, marshes, reservoirs, and brackish estuaries managed or monitored by agencies like the National Park Service and Wetlands International. Urban-adapted populations use man-made water bodies in cities such as Los Angeles, Chicago, Houston, and New York City, while localized subspecies and vagrants have been recorded on islands administered by entities like the United States Fish and Wildlife Service refuges.
American coots are highly social outside the breeding season, forming large flocks that have been the subject of behavioral studies at universities including University of Minnesota, University of British Columbia, and Cornell University. Social organization, dominance hierarchies, and agonistic interactions are reported in literature from journals associated with the Ecological Society of America and field research supported by foundations such as the National Science Foundation. Territorial defense during breeding involves displays and chases, paralleling descriptions in monographs from the British Ornithologists' Union and comparisons with rail species observed by researchers affiliated with the Royal Society. Predation pressure from raptors like the peregrine falcon, northern harrier, and red-tailed hawk influences nesting site selection and vigilance behavior documented by the Raptor Research Foundation.
The American coot's omnivorous diet includes aquatic vegetation, seeds, invertebrates, and small vertebrates, with seasonal shifts documented in studies from the Journal of Wildlife Management and reports by the International Union for Conservation of Nature specialists. Foraging methods range from surface dabbling and underwater diving to grazing on emergent plants in marshes overseen by organizations such as the Ramsar Convention and the National Wetlands Inventory. Diet composition varies with habitat and has been quantified in analyses conducted by research groups at the University of California, Davis, the University of Florida, and the Florida Museum of Natural History. Interactions with introduced species and agricultural crops have been observed in historical accounts involving agencies like the United States Department of Agriculture.
Breeding timing and clutch parameters have been reported across diverse ecoregions from the Great Plains to the Pacific Northwest in surveys coordinated by the North American Breeding Bird Survey. Pairs build floating nests anchored to emergent vegetation, a nesting strategy described in classic texts from authors associated with the University of Cambridge and the American Ornithological Society. Typical clutches number 6–12 eggs, with incubation by both sexes and fledging periods documented in longitudinal studies at research sites including the Scripps Institution of Oceanography and the University of Washington. Brood parasitism, egg rejection behavior, and cooperative defense against predators have been analyzed in papers published under the auspices of the Royal Society Publishing.
Vocal repertoires include contact calls, alarm notes, and soft trill-like sounds used in pair bonding and territorial interactions. Acoustic studies employing methods from the Cornell Lab of Ornithology and equipment standardized by the Acoustical Society of America have quantified frequency ranges and call structure. Visual signals such as bill-raising and chasing are described in ethograms developed in behavioral ecology courses at institutions like University of Toronto and McGill University.
Currently assessed as Least Concern by assessment bodies associated with the IUCN Red List, population trends are monitored by the Partners in Flight and national agencies like the US Fish and Wildlife Service. Threats include wetland loss from development projects regulated by agencies such as the Environmental Protection Agency, contaminant exposure examined by the United States Geological Survey, and collisions with anthropogenic structures monitored in studies by organizations like Fatal Light Awareness Program. Management actions include wetland restoration funded through programs at the Natural Resources Conservation Service and public education initiatives by NGOs including the Audubon Society and Wildlife Conservation Society. Human–coot interactions in urban parks and recreational lakes have prompted research collaborations involving municipal governments and universities including University of California, Los Angeles.
Category:Fulica Category:Birds of North America