South American tern

South American tern
Name	South American tern
Status	LC
Status system	IUCN3.1
Genus	Sterna
Species	hirundinacea
Authority	Lesson & Garnot, 1827

South American tern is a seabird of the family Laridae found along coasts and islands of South America. It is noted for its slender body, forked tail, and fish-catching plunge-diving, and has been the subject of research by ornithologists working in coastal ecology, marine biology, and conservation biology. Field guides, museum collections, and regional conservation bodies document its morphology and status across multiple nations and territories.

Taxonomy and naming

The species was described by René Lesson and Prosper Garnot during voyages associated with exploratory expeditions, and its placement within the genus Sterna has been treated in taxonomic revisions alongside related taxa such as Common tern, Arctic tern, and Elegant tern. Systematists have debated relationships using characters compared in collections at institutions like the British Museum and the Smithsonian Institution, and molecular studies have used specimens from repositories including the Museum für Naturkunde and the American Museum of Natural History. Nomenclatural history intersects with publications in journals produced by societies such as the Royal Society, Linnean Society of London, and regional organizations like the Sociedad Española de Ornitología. Regional names used by naturalists in Argentina, Chile, Uruguay, Brazil, and Peru appear in checklists maintained by bodies such as the International Ornithologists' Union and the South American Classification Committee.

Description

Adult birds show a combination of plumage characters referenced in field guides such as those from the Royal Canadian Geographical Society and regional manuals produced by the Colección Nacional de Aves. The bird's length and wing measurements are recorded in faunal surveys conducted by universities including the University of Buenos Aires, Pontifical Catholic University of Chile, and the Federal University of Rio Grande do Sul. Morphological comparisons have been drawn to species treated in monographs by authors affiliated with the American Ornithological Society and the British Trust for Ornithology. Illustrations and plates in works by artists commissioned by the Audubon Society, Cornell Lab of Ornithology, and the Museum of New Zealand Te Papa Tongarewa assist in identification. Measurements and molt patterns appear in technical reports prepared for agencies such as the Chilean National Forest Corporation and the Argentine Ornithological Association.

Distribution and habitat

The species breeds on coasts, islands, and estuaries along the Pacific and Atlantic littorals of South America, with records from provinces and regions administered by authorities like the Ministry of Environment and Sustainable Development (Argentina), the Ministry of the Environment (Chile), and the Ministry of the Environment (Peru). Range maps feature in atlases published by the National Geographic Society and data portals run by the Global Biodiversity Information Facility, the eBird project of the Cornell Lab of Ornithology, and regional observatories coordinated with the BirdLife International network. Habitats include rocky shores and sandy bays documented in coastal ecology studies conducted by institutes such as the Instituto de Investigaciones Marinas y Costeras and the Centro de Investigaciones del Mar y la Atmosfera.

Behavior and ecology

Foraging behavior is described in marine ecology literature produced by researchers at the University of São Paulo, Pontifical Catholic University of Rio Grande do Sul, and the University of Valparaíso, with diet studies referencing fisheries data from authorities like the Food and Agriculture Organization and national ministries of fisheries. Interactions with predators and competitors have been recorded in field studies involving collaborators from the Wildlife Conservation Society, the International Union for Conservation of Nature, and regional NGOs. Movement patterns and partial migrations are tracked using methods developed by groups such as the Global Seabird Tracking Database and technology providers like Argos (satellite system), with tagging programs run in partnership with universities and conservation agencies including the University of Chile and the Ministry of the Environment (Uruguay).

Breeding and life cycle

Nesting colonies have been monitored on islands under the jurisdiction of provincial and national park services such as the Chilean National Park System, Parque Nacional Tierra del Fuego, and protected areas designated by the Brazilian Institute of Environment and Renewable Natural Resources. Reproductive parameters, clutch size, and chick development are reported in theses and papers from departments of biology at institutions like the National University of La Plata and the Federal University of Pernambuco. Breeding phenology aligns with seasonal cycles studied by climatologists at the National Meteorological Service (Argentina) and oceanographers at institutions like the Scripps Institution of Oceanography, reflecting links between marine productivity and reproductive success.

Conservation status and threats

The species is assessed under criteria applied by the International Union for Conservation of Nature and monitored by networks including BirdLife International and national agencies such as the Chilean Forest Corporation and the Argentine Secretariat of Environment and Sustainable Development. Main threats include habitat disturbance documented in environmental impact assessments by consulting firms working with entities like the Inter-American Development Bank and coastal development overseen by ministries such as the Ministry of Housing, Urbanism and Planning (Chile). Bycatch and fisheries interactions are evaluated in reports by the Food and Agriculture Organization and regional fisheries management organizations, while invasive species impacts are addressed in conservation plans supported by the Global Environment Facility and regional conservation NGOs.

Category:Birds of South America