Blue-winged Teal

Blue-winged Teal
Name	Blue-winged Teal
Status	LC
Genus	Spatula
Species	discors
Authority	(Linnaeus, 1766)

Blue-winged Teal The blue-winged teal is a small dabbling duck in the genus Spatula valued by ornithologists, conservationists, and wetland managers for its migratory behavior and role in North American ecosystems. It is studied by institutions such as the Smithsonian Institution, United States Fish and Wildlife Service, Canadian Wildlife Service, and universities including Cornell University and University of British Columbia for population dynamics, habitat use, and disease ecology. Hunters, birdwatchers, and agencies like the National Audubon Society and Ducks Unlimited monitor its trends alongside other species such as the Mallard, Northern Pintail, and Green-winged Teal.

Taxonomy and Systematics

Originally described by Carl Linnaeus in 1766, the species is classified as Spatula discors within the family Anatidae, which also includes genera such as Anas and Aythya. Modern systematic treatments incorporate molecular analyses from laboratories at Harvard University, University of Oxford, and the Natural History Museum, London that resolved relationships among dabbling ducks and prompted taxonomic revisions affecting taxa like the Blue-winged Teal, Northern Shoveler, and Gadwall. Historical collectors and taxonomists such as Mark Catesby, John James Audubon, and Alexander Wilson contributed early specimens and descriptions that informed later work by curators at institutions like the American Museum of Natural History and Royal Ontario Museum.

Description

The species is a small teal with males showing distinctive plumage patterns studied by artists and scientists including John Gould and photographers at the National Geographic Society. Adult males in breeding plumage have a broad facial crescent and striking wing coloration recognized by field guides from Roger Tory Peterson, Sibley Guides authors, and the Royal Society for the Protection of Birds; females and eclipse males resemble cryptic plumages documented in museum collections at Yale Peabody Museum and Smithsonian National Museum of Natural History. Morphological metrics such as wingspan, bill length, and mass have been recorded in long-term studies by Canadian Wildlife Service, USGS Bird Banding Laboratory, and stations affiliated with University of Minnesota and Manitoba Museum. Plumage, vocalizations, and molt sequences are described in works published by Cornell Lab of Ornithology, British Ornithologists' Union, and field researchers collaborating with World Wildlife Fund.

Distribution and Habitat

Blue-winged teal breed across boreal and temperate regions surveyed by the Breeding Bird Survey, including landscapes mapped by Environment Canada and the US Fish and Wildlife Service. Their wintering range extends to coastal and inland wetlands monitored by organizations such as Wetlands International, encompassing sites in Mexico, Central America, and northern regions of South America where conservation NGOs like Pronatura and academic partners at Universidad Nacional Autónoma de México conduct fieldwork. Habitats include seasonal marshes, prairie potholes cataloged in studies by Iowa State University and University of Saskatchewan, flooded rice fields managed by agricultural agencies like USDA, and coastal estuaries protected by programs from Ramsar Convention contracting parties. Migration corridors intersect flyways defined by the Atlantic Flyway, Mississippi Flyway, and Central Flyway and are studied by networks including BirdLife International and the North American Bird Conservation Initiative.

Behavior and Ecology

As a dabbling duck, the species feeds on aquatic invertebrates and seeds in shallow water following foraging research by University of Florida, Texas A&M University, and ecological modelers at National Center for Ecological Analysis and Synthesis. Social behavior, flocking dynamics, and predator avoidance have been observed in wetlands frequented by predators such as Red-tailed Hawk, Great Horned Owl, and mammalian predators documented in studies by Wildlife Conservation Society researchers. Parasite and disease surveillance for avian influenza, conducted collaboratively by Centers for Disease Control and Prevention, Food and Agriculture Organization, and veterinary teams at University of California, Davis, monitor impacts on populations. Seasonal molt, dispersal patterns, and telemetry work employing GPS devices have been carried out by teams from University of Montana, Bird Studies Canada, and international partners in projects funded by agencies like the National Science Foundation.

Breeding and Life Cycle

Breeding occurs in northern grasslands and boreal wetlands documented by researchers from University of Alberta, Montana State University, and provincial wildlife services; nests are typically concealed in emergent vegetation similar to nesting descriptions in research by Prairie Research Institute. Clutch size, incubation behavior, and duckling survival rates have been quantified in demographic studies by US Fish and Wildlife Service, Canadian Wildlife Service, and university biologists collaborating with Ducks Unlimited. Breeding phenology is influenced by climate patterns analyzed by climatologists at NOAA, Environment Canada, and research centers studying effects of El Niño–Southern Oscillation and Arctic amplification on migratory timing. Juvenile recruitment and adult return rates are monitored via banding programs coordinated by the USGS Bird Banding Laboratory and ringing schemes operated by British Trust for Ornithology partners.

Conservation and Threats

The species is currently listed as Least Concern by global assessments compiled by IUCN, but regional declines prompt conservation actions by organizations such as Ducks Unlimited, National Audubon Society, and governmental agencies including US Fish and Wildlife Service and Environment Canada. Threats include wetland loss from agriculture and development documented in reports by World Resources Institute, pesticide exposure studied by Environmental Protection Agency, and climate-driven habitat changes analyzed by researchers at NASA and IPCC. Management responses include habitat restoration projects funded by North American Wetlands Conservation Act grants, policy measures shaped by legislatures in the United States Congress and Parliament of Canada, and on-the-ground conservation delivered through collaborations among universities, NGOs, and indigenous stewardship programs coordinated with bodies like the Assembly of First Nations and regional conservation districts.

Category:Anatidae