Vagrancy and colonization of St. Thomas and St. John, U.S. Virgin Islands, by Adelaide’s Warblers (Setophaga adelaidae)

Richard R. Veit, Lucinda C. Zawadzki, Lisa L. Manne, Pearl Cales, Danielle Fibikar, Shannon Curley, Elizabeth Dluhos, Robert L. Norton

Abstract


We identified and photographed five Adelaide’s Warblers (Setophaga adelaidae) in the Lameshur Bay area on the southeastern corner of St. John, U.S. Virgin Islands, during January 2015, and found eight birds in the same area during January 2016. Adelaide’s Warblers, endemic to Puerto Rico and Vieques Island, the latter 67 km to the southwest of St. John, were first recorded in the U.S. Virgin Islands in 2012–2013 on both St. Thomas and St. John. We suggest that vagrancy of Adelaide’s Warblers to the U.S. Virgin Islands, against prevailing easterly trade winds, may represent in real time the island colonization process of some passerine birds in the West Indies.

En enero de 2015, identificamos y fotografiamos a cinco individuos de Reinita Mariposera (Setophaga adelaidae) en el área de la Bahía Lameshur, en el extremo sudeste de San Juan, Islas Vírgenes estadounidenses. También encontramos ocho individuos en la misma zona en enero de 2016. Reinita Mariposera, endémica de las islas de Puerto Rico y Vieques y cuyo punto más cercano a San Juan dista 67 km, fue registrada por primera vez en las Islas Vírgenes estadounidenses en 2012–2013 en ambas islas: Santo Tomás y San Juan. Sugerimos que la divagancia de Reinita Mariposera en las Islas Vírgenes estadounidenses en contra de los vientos alisios predominantes del este pueden representar, en tiempo real, el proceso de colonización de una isla por parte de especies paseriformes en el Caribe Insular.

Nous avons identifié et photographié cinq Parulines d’Adélaïde (Setophaga adelaidae) dans la région de Lameshur Bay au sud-est de St-John (Îles Vierges américaines), en janvier 2015, et nous avons trouvé huit individus dans la même région en janvier 2016. La Paruline d’Adélaïde, espèce endémique des îles de Porto Rico et de Vieques - cette dernière étant située à 67 km au sud-ouest de St-John - a été mentionnée à St-Thomas et St-John (Îles Vierges américaines) pour la première fois en 2012–2013. Nous estimons que l’erratisme de la Paruline d’Adélaïde aux Îles Vierges américaines, contre les alizés dominants de secteur est, pourrait illustrer en temps réel le processus de colonisation des Antilles par les passereaux.


Keywords


Adelaide’s Warbler; Colonization; Island Biogeography; St. John; St. Thomas; Setophaga adelaidae; U.S. Virgin Islands; Vagrancy; West Indies

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