Reproducción del Gaviotín Sudamericano Sterna hirundinacea (Charadriiformes: Laridae) en el Lago Epecuén, Buenos Aires, Argentina

Viviana Castro; Juan José Abut; Sebastián Preisz; Laura Dodyk; Candelaria Neyra; Pablo Grilli

doi:10.30550/j.azl/2021.65.2/2021-06-10

Authors

Viviana Castro Servicio de Guardaparques de la Municipalidad de Adolfo Alsina
Juan José Abut Servicio de Guardaparques de la Municipalidad de Adolfo Alsina
Sebastián Preisz Yetapá Safaris Fotográficos
Laura Dodyk Aves Argentinas / Asociación Ornitológica del Plata
Candelaria Neyra
Pablo Grilli Aves Argentinas / Asociación Ornitológica del Plata

DOI:

https://doi.org/10.30550/j.azl/2021.65.2/2021-06-10

Keywords:

Nesting, breeding colony, Encadenadas del Oeste

Abstract

The South American Tern (Sterna hirundinacea) is a coastal-marine species, migratory and exclusive to South America. Although it has been recorded in several inland water bodies in Argentine territory, so far, all nesting events have occurred on the marine coast, where the abundance of food (based on Argentine Anchoita Engraulis anchoita) can sustain colonies, except for a small colony on the Rio Negro. In Feb-
ruary 2020, adults of South American Terns were registered feeding fledglings with lobsters, in the surroundings of Lake Epecuén, in the Province of Buenos Aires. In October 2020, 126 nests were found in a colony on an islet with one or two eggs (average 1.7), small chicks and predated eggs. During the breeding season, it feeds its chicks with a diet made up of more than 90% fish. Adults were observed hunting
insects and feeding fledglings in the air. Lake Epecuén is hypersaline, and has no fish, so insects are probably its replacement. The South American Tern reproduces following two phenologies: the southern winter (for Brazil and Uruguay) and the southern summer in Patagonia Argentina. According to its location and the period of activity, this new colony could correspond to the Patagonian phenology.

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