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A Major Bridled Tern (Sterna anaethetus) Colony in the Gulf of Fonseca, Nicaragua

Oliver Komar and Wilfredo Rodríguez
Colonial Waterbirds
Vol. 19, No. 2 (1996), pp. 264-267
Published by: Waterbird Society
DOI: 10.2307/1521868
Stable URL: http://www.jstor.org/stable/1521868
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Major Bridled Tern (Sterna anaethetus) Colony in the Gulf of Fonseca, Nicaragua
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Abstract

On 5 August 1994, the islets of Los Farallones in the Gulf of Fonseca, Nicaragua, contained a colony of Bridled Tern (Sterna anaethetus), consisting of at least 1,200 adults and nine chicks. We estimated the size of the colony as 600 breeding pairs, considering that many adults were feeding at sea, and also that some of the adults present may not have been breeding. Breeding colonies of the eastern Pacific Ocean race, S. a. nelsoni, have been confirmed at only two other sites, in Mexico and Costa Rica. The Los Farallones colony is much larger than the other reported colonies, and may represent the major portion of the breeding population of S. a. nelsoni. Bridled Terns at Los Farallones did not exhibit nest defense behavior as described from other colonies, suggesting that there is little nest predation or disturbance at the colony. /// El 5 de agosto de 1994, las isletas de Los Farallones en el Golfo de Fonseca, Nicaragua, contenía una colonia de Sterna anaethetus, con al menos 1200 adultos y nueve polluelos. Se estimó el tamaño de la colonia en 600 parejas reproductoras, tomando en cuenta que muchos de los adultos estaban buscando comida fuera del sitio, y también que algunos de los adultos presentes posiblemente no eran reproductores. Colonias de la poblacion S. a. nelsoni, de la región oriental del Oceáno Pacífico, se han confirmado solamente en dos sitios más, en México y Costa Rica. La colonia en Los Farallones es mucho mayor que las otras colonias, y puede representar la mayor parte de la población reproductora de S. a. nelsoni. Las aves en Los Farallones no mostraron comportamiento de defensa descrito de otras colonias, lo que sugiere que hay poca predación o perturbancia en la colonia.

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