Red-necked stint

Red-necked stint
JJ Harrison (https://www.jjharrison.com.au/) · CC BY-SA 4.0 · source
Name	Red-necked stint
Status	VU
Status system	IUCN3.1
Genus	Calidris
Species	ruficollis
Authority	(Pallas, 1776)

Red-necked stint is a small migratory wader in the family Scolopacidae notable for its long-distance migrations between Arctic breeding grounds and Australasian non-breeding sites. It breeds on tundra across parts of northeastern Siberia and winters in coastal wetlands of Australia, New Zealand, and Southeast Asia, regularly appearing on flyways monitored by conservation groups and research institutions. The species is the focus of international conservation agreements and flyway-scale studies involving organizations such as the Ramsar Convention, BirdLife International, and national wildlife agencies.

Taxonomy and systematics

The species was described by Peter Simon Pallas in the 18th century and placed in the genus Calidris, which groups a number of small sandpipers historically rearranged following molecular studies by research teams at institutions like the Natural History Museum, Smithsonian Institution, and universities conducting avian phylogenetics. Molecular analyses published in journals and by consortia including the International Ornithologists' Union have clarified relationships among Calidris, Phalaropus, and other genera within Scolopacidae, while field guides from the Royal Society for the Protection of Birds and regional checklists reflect updates to systematics. Subspecific variation has been debated among taxonomists affiliated with museums such as the American Museum of Natural History and the Museum of Comparative Zoology.

Description

Adults in breeding plumage display a rufous breast and face contrasts noted in field guides by authors from the British Trust for Ornithology and the Handbook of the Birds of the World. Plumage descriptions are compared across plates by illustrators linked to the Cornell Lab of Ornithology and photographers from the National Geographic Society. The species measures around 13–16 cm and is identified by fine dark streaking and a short thin bill in keys used by the American Birding Association and bird observatories such as the Wader Study Group. Non-breeding birds show grey upperparts similar to related species treated in identification literature from the Royal Australasian Ornithologists Union.

Distribution and habitat

Breeding occurs on tundra in northeastern Siberia and adjacent Arctic islands; migratory routes span the East Asian–Australasian Flyway monitored by flyway partnerships and research programs coordinated with governments of China, Japan, South Korea, Russia, and Australia. Wintering sites include coastal tidal flats, estuaries, and sheltered bays in regions documented by the Wetlands International and national agencies such as the Department of Agriculture, Water and the Environment (Australia). Stopover and staging areas along the Yellow Sea coast have been highlighted in reports by NGOs like BirdLife International and multilateral initiatives involving the East Asian–Australasian Flyway Partnership.

Behavior and ecology

The species is gregarious outside the breeding season and forms flocks recorded in counts by organizations including the Global Flyway Network and regional bird clubs such as the Royal Forest and Bird Protection Society of New Zealand. Migratory timing and phenology have been analyzed by researchers at universities including University of Oxford, University of Cambridge, and University of Queensland using data from bird-ringing schemes coordinated by bodies like the British Trust for Ornithology and national ringing centers. Predation on breeding grounds involves Arctic predators documented in studies by the University of Alaska Fairbanks and ecological monitoring projects funded by agencies such as the National Science Foundation.

Diet and foraging

Diet consists primarily of small invertebrates on intertidal mudflats and tundra, as reported in diet studies published by research groups at the Australian Museum and the Smithsonian Migratory Bird Center. Foraging behavior—probing and picking in soft substrates—is described in field studies conducted by the Wader Study Group and published in ornithological journals associated with the American Ornithological Society and British Ornithologists' Union. Seasonal shifts in prey composition have been documented in collaborative projects involving the Yellow Sea Eutrophication Research Network and regional conservation agencies.

Breeding and reproduction

Nesting occurs on tundra where clutch size, incubation, and chick development have been documented in studies from institutions such as the Russian Academy of Sciences and the Arctic Research Consortium of the United States. Courtship displays and breeding phenology are described in monographs produced by researchers affiliated with the University of Alaska and field teams supported by the National Geographic Society. Juvenile migration and survival rates have been the subject of tracking studies employing technologies developed by laboratories at Murdoch University and the University of Sydney.

Conservation status and threats

The species is listed as Vulnerable on the IUCN Red List and is included in conservation priorities by BirdLife International and multilateral agreements like the Ramsar Convention and the Convention on Migratory Species. Major threats include loss and degradation of intertidal habitat on the Yellow Sea coast due to reclamation projects overseen by regional governments, pressures highlighted in reports produced by Wetlands International and NGOs such as the World Wildlife Fund. Climate change impacts on Arctic breeding habitat have been modeled by climate research centers including the Intergovernmental Panel on Climate Change and university research groups, while bycatch and disturbance at stopover sites are monitored by national fisheries and conservation agencies in countries across the flyway.

Category:Calidris Category:Birds of Asia Category:Birds of Australia