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Southeastern breeding range extension of the Gray Vireo (Vireo vicinior) into Mexico
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Southeastern breeding range extension of the Gray Vireo (Vireo vicinior) into Mexico
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Journal Article
Southeastern breeding range extension of the Gray Vireo (Vireo vicinior) into Mexico
2025
Overview
The Gray Vireo (Vireo vicinior) is a scarcely studied species of the arid mountains of the southwestern U.S. and northern Mexico, especially in the eastern part of its known range. Between May–August 2013, we located 10 nests of the Gray Vireo at the eastern canyons of the Sierra La Paila, Coahuila, Mexico; approximately 300 km SE from the closest known breeding population in Sierra Maderas del Carmen. Gray oaks (Quercus grisea) were the main nesting plant, followed by shrubby bullseyes (Nahuatlea hypoleuca). We recorded three new nesting plant species for the Gray Vireo. Six of the eight monitored nests were successful and two were abandoned due to Brown-headed Cowbird (Molothus ater) brood parasitism. This new population stands out as the southernmost, extends the breeding range of the Gray Vireo to the southeast of Coahuila, and raises questions about their potentially distinctive seasonal status, breeding ecology, and habitat use. The discovery of this breeding range extension implies the existence of more undiscovered reproductive populations throughout arid mountains of the northern Sierra Madre Oriental. El vireo gris (Vireo vicinior) es una especie poco estudiada de las montañas áridas del suroeste de Estados Unidos y el norte de México, especialmente en la parte oriental de su área de distribución conocida. Entre mayo–agosto de 2013 localizamos 10 nidos del vireo gris en los cañones orientales de la Sierra La Paila, Coahuila, México; aproximadamente 300 km al SE de la población reproductora conocida más cercana en Sierra Maderas del Carmen. Los encinos grises (Quercus grisea) fueron la principal planta usada para la anidación, seguidos por chomonques (Nahuatlea hypoleuca). Se registraron tres nuevas especies de plantas para anidación de vireo gris. Seis de los ocho nidos monitoreados tuvieron éxito y dos fueron abandonados debido al parasitismo de nido del tordo cabeza café (Molothus ater). Esta nueva población destaca como la más austral, amplía el área de reproducción del vireo gris hacia el sureste de Coahuila y plantea preguntas sobre su estatus migratorio o residente potencialmente distintivo, su ecología reproductiva y el uso de su hábitat. El descubrimiento de esta extensión del rango reproductivo implica la existencia de más poblaciones reproductivas no descubiertas en las sierras áridas del norte de la Sierra Madre Oriental. PALABRAS CLAVE chomonque; Coahuila; distribución reproductiva propuesta; encino gris; nueva población reproductiva; nuevas plantas para anidación; Sierra La Paila
