Anas acuta

Anas acuta
Name	Northern pintail
Status	LC
Status system	IUCN3.1
Genus	Anas
Species	acuta
Authority	Linnaeus, 1758

Anas acuta is a migratory dabbling duck known commonly as the northern pintail. It is recognized for its slender profile, long tail, and extensive flyways across Eurasia and North America. The species is central to wetland ecosystems and has been the subject of study by ornithologists and conservationists worldwide.

Taxonomy and nomenclature

The species was described by Carl Linnaeus in 1758 and placed in the genus Anas, a group historically treated by taxonomists such as Thomas Pennant and revised in modern works by researchers affiliated with institutions like the Royal Society and the Smithsonian Institution. Molecular phylogenetics from teams at the Natural History Museum, London and the American Museum of Natural History have influenced reassessments of dabbling-duck relationships, comparing Anas with related genera treated in faunal monographs from the British Ornithologists' Union and the American Ornithologists' Union. Nomenclatural decisions follow codes promulgated by the International Commission on Zoological Nomenclature and have been incorporated into checklists maintained by organizations such as BirdLife International and the International Union for Conservation of Nature.

Description

Adults exhibit sexual dimorphism noted in field guides produced by the National Audubon Society and the Royal Society for the Protection of Birds. The male displays a chocolate-brown head, white neck stripe, and elongated central tail feathers, features illustrated in plates by John James Audubon and later by illustrators at the Field Museum. Females are subtler, with mottled plumage depicted in identification keys from the Cornell Lab of Ornithology and the British Trust for Ornithology. Measurements and morphometrics used in studies at the Smithsonian Institution National Museum of Natural History and the University of Oxford provide standard metrics for length, wingspan, and mass.

Distribution and habitat

The species breeds across temperate and subarctic regions documented in atlases from the Royal Geographical Society and migratory maps produced by the United States Geological Survey. Key breeding areas include tundra and prairie wetlands recorded in surveys by the Canadian Wildlife Service, the Finnish Museum of Natural History, and the Russian Academy of Sciences. Wintering grounds span coastal estuaries and inland wetlands cataloged by the World Wide Fund for Nature and the Ramsar Convention list of wetlands. Migration corridors intersect flyways described in reports by the African-Eurasian Migratory Waterbird Agreement and the North American Waterfowl Management Plan.

Behavior and ecology

Feeding behavior is typical of dabbling ducks, studied in behavioral ecology papers from the Max Planck Society and the University of California, Davis. Diet includes aquatic invertebrates and seeds, with seasonal shifts documented by researchers at the University of British Columbia and the Natural History Museum of Denmark. Social dynamics during migration have been analyzed in collaborations involving the European Commission and the United Nations Environment Programme. Predation pressures and interspecific interactions feature in field studies by the National Park Service and the Swedish University of Agricultural Sciences.

Reproduction and life cycle

Breeding phenology follows patterns reported in longitudinal studies by the Royal Society and the Norwegian Institute for Nature Research. Nesting occurs on ground in marshes and tundra habitats surveyed by the Canadian Wildlife Service and the Icelandic Institute of Natural History. Clutch size, incubation periods, and fledging success rates have been quantified in papers from the University of Helsinki and the Danish Ornithological Society, with juvenile survival influenced by factors assessed by the United States Fish and Wildlife Service.

Conservation and threats

Population trends are tracked by BirdLife International and assessed under criteria of the International Union for Conservation of Nature. Threats include habitat loss from agricultural conversion documented by the Food and Agriculture Organization and wetland drainage recorded in reports by the European Environment Agency. Hunting pressure and harvest regulation are managed through frameworks produced by the Convention on Migratory Species and national agencies such as the Canadian Wildlife Service and the U.S. Fish and Wildlife Service. Conservation measures promoted by the Ramsar Convention, World Wide Fund for Nature, and regional conservation NGOs aim to restore wetlands and secure key stopover sites.

Relationship with humans

The species features in cultural records and hunting histories compiled by institutions like the Museum of Vertebrate Zoology and the Royal Ontario Museum. Its role in game management has been debated in policy forums involving the North American Wetlands Conservation Council and the European Commission. Scientific monitoring programs coordinated by the British Trust for Ornithology, USGS, and the European Bird Census Council engage citizen scientists and professionals in tracking population dynamics. Conservation funding and international agreements, including initiatives by the Global Environment Facility and the Convention on Biological Diversity, influence management strategies.

Category:Anatidae Category:Migratory birds