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| Belcher's gull | |
|---|---|
| Name | Belcher's gull |
| Status | NT |
| Status system | IUCN3.1 |
| Genus | Larus |
| Species | belcheri |
| Authority | (Mathews, 1912) |
Belcher's gull is a South American coastal seabird in the family Laridae. It is resident along the Pacific coasts of Peru and northern Chile and is recognized for its grey mantle, contrasting head pattern, and association with rocky shoreline and island habitats. The species has been the subject of regional avifaunal surveys by institutions such as the American Ornithologists' Union and field guides used by researchers from the Smithsonian Institution and the British Ornithologists' Union.
Belcher's gull was described in the early 20th century and placed in the genus Larus, which also includes widespread taxa like the herring gull complex studied by ornithologists at the Natural History Museum, London and the Cornell Lab of Ornithology. Historical treatments compared it with the kelp gull and the American herring gull while taxonomic revisions have been influenced by molecular work from teams at University of California, Berkeley and the Max Planck Institute investigating Laridae phylogenetics. Named in honor of persons linked to Pacific exploration and collections, its nomenclatural history appears alongside specimen records held by museums such as the British Museum and the Museo de Historia Natural de Lima.
Adults have a slate-grey mantle and upperwings, white underparts, and a white head with a distinctive dark eye stripe; wingtip patterning includes black primary tips with white "mirrors" similar to markings noted in field studies from Point Reyes National Seashore and the Galápagos Islands literature. Size is intermediate among Larus species; plumage comparisons are often made with specimens in collections at the American Museum of Natural History and illustrated in plates from the Handbook of the Birds of the World and regional guides published by the National Geographic Society. Juveniles show brown-streaked plumage paralleling descriptions in monographs produced by the Royal Society and imagery curated by the Audubon Society.
Belcher's gull occurs along the Humboldt Current system off Peru and northern Chile, with key localities including the Sechura Bay region, the Paracas National Reserve, and islands such as the Guañape Islands and Chañaral Island. It frequents rocky coasts, reefs, and small islands often visited by fisheries from ports like Callao and Paita, and it is associated with marine productivity zones identified in research by institutes like the International Council for the Exploration of the Sea and the University of Chile. Seasonal movements are limited; distributional data have been compiled by organizations such as the BirdLife International partnership and national parks authorities including SERNANP.
Belcher's gull is largely resident and forms small to moderate-sized colonies; social behavior has been observed by field teams from the University of California, Santa Cruz and local conservation NGOs such as Pro Delphinus. It shows philopatry similar to patterns documented for other Larus species in studies by the Institute of Bird Population and participates in interspecific interactions with species recorded in surveys by the Peruvian Marine Research Institute and the Chilean National Forest Corporation (CONAF). Vocalizations and display behaviors were described in regional ornithological bulletins produced by the Sociedad Ornithológica del Perú.
The species feeds on intertidal invertebrates, small vertebrates, and scavenged fish, exploiting resources made available by upwelling in the Humboldt Current and by human activities linked to fisheries from ports such as Huanchaco and Iquique. Foraging strategies include pecking among kelp and rocks, kleptoparasitism observed in accounts from marine biologists at the Scripps Institution of Oceanography, and scavenging at landing sites monitored by the Food and Agriculture Organization. Diet studies referenced in regional ecological reports by the Peruvian Institute of the Sea indicate reliance on limpets, crabs, and small fish common to the eastern Pacific littoral.
Breeding takes place in colonies on offshore islands and rocky headlands; documented nesting sites include protected areas like the Paracas National Reserve and islands surveyed by the Wildlife Conservation Society. Nests are shallow scrapes with clutch sizes reported in field studies conducted by researchers affiliated with the Pontifical Catholic University of Peru and the University of Antofagasta. Timing of breeding corresponds with local seasonal cycles influenced by the El Niño–Southern Oscillation and has been monitored through long-term studies led by coastal research programs at the Peruvian Marine Scientific Directorate.
Belcher's gull is assessed as Near Threatened on conservation lists maintained by BirdLife International and national red lists of Peru and Chile due to restricted range and pressures including habitat disturbance from tourism managed by agencies such as SERNANP and CONAF, artisanal and industrial fisheries operating from ports like Callao and Antofagasta, and introduced predators documented in island conservation work by the Island Conservation organization. Conservation actions recommended by NGOs and government bodies include protection of breeding islands, monitoring by research institutions such as the University of Chile and community-based programs supported by the World Wildlife Fund.
Category:Laridae Category:Birds of Peru Category:Birds of Chile