The Setophaga petechia complex includes 43 subspecies distributed within the new world, of which some are migratory and others are resident, with only two resident subspecies in the Mexican Caribbean: Setophaga petechia bryanti a mangrove subspecies belonging to the erithachorides group resident on the mainland of the Yucatan Peninsula and Setophaga petechia rufivertex endemic to Cozumel Island and belonging to the petechia group. Recently, a new population of individuals presenting intermediate phenotypic traits and living in mangrove ecosystems was discovered and reported for Cozumel Island. In this study, we used a multi-character approach including genetic (five ISSR genetic markers), morphometric (eight traits), phenotypic (four characteristics of males), and acoustic dataset (11 parameters) to understand the process of differentiation and the status of these new island individuals in relation to the two well-established subspecies using a total of 60 individuals (20 for each group). Through multivariate analyses based on different dataset used in our study, we show how the new population is related to the endemic island subspecies, S. p. rufivertex and to the mainland subspecies, S. p. bryanti while demonstrating finite differences. We conclude that the new population of S. petechia on Cozumel Island is a well-established population with high level of differentiation.
El colibrí tijereta mexicano (Doricha eliza) es una especie endémica de México; actualmente se encuentra en peligro de extinción con base en la NOM-059-SEMARNAT-2010. De septiembre a noviembre de 2011 registramos dos nidos de D. eliza, uno en selva baja caducifolia, en el municipio de Chicxulub Puerto, y el segundo en un potrero ganadero en Dzilam de Bravo, Yucatán. Asimismo, reportamos los registros de nidos de años anteriores en la vegetación costera y en construcciones. En conjunto, estos son los primeros registros de nidos de la especie en el estado de Yucatán que son reportados en la literatura científica. Estos registros implican que el área de distribución de D. eliza se extiende hasta al menos 4 km tierra adentro incluyendo otros tipos de vegetación (i. e., selva baja caducifolia y vegetación secundaria) no reportados hasta la fecha.
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