Genetic and ecological differentiation in the endemic avifauna of Tiburon Island
Por:
Rojas-Soto O.R., Westberg M., Navarro-Sigüenza A.G., Zink R.M.
Publicada:
1 jul 2010
Resumen:
Tiburon Island is a land-bridge island in the Gulf of California, separated from mainland Sonora by 3 km. The shallow channel (13 m) separating the island and mainland is thought to have formed 10 000 years ago. Although the majority of avian resident species are not taxonomically differentiated, six species are represented by endemic subspecies (cactus wren, gila woodpecker, black-tailed gnatcatcher, Gambel's quail, canyon towhee, northern cardinal), of which all but one (black-tailed gnatcatcher) possess a pallid, ash-gray coloration compared to those on the mainland. We compared mtDNA sequences of five of the endemic subspecies (we lacked samples of northern cardinal) and one more widespread subspecies (verdin) present on the island from sequences previously published for mainland populations. For most populations, we discovered no genetic differentiation between the island and the mainland, thus questioning the taxonomic validity of the endemic subspecies. The canyon towhee and the
Filiaciones:
Rojas-Soto O.R.:
Red de Biología Evolutiva, Instituto de Ecología, Mexico
Westberg M.:
Carretera Antigua a Coatepec, km 2.5, No. 351 Congregación el Haya, C.P.91070, Xalapa, Veracruz, Mexico
Navarro-Sigüenza A.G.:
Univ Nacl Autonoma Mexico, Fac Ciencias, Museo Zool, Mexico City 04510, DF, Mexico
Univ. of Minnesota, St. Paul, MN 55108, United States
Zink R.M.:
Carretera Antigua a Coatepec, km 2.5, No. 351 Congregación el Haya, C.P.91070, Xalapa, Veracruz, Mexico
Museo de Zoología, Facultad de Ciencias, Univ. Nacional Autónoma de México, Apartado Postal 70-399, México D. F. 04510, Mexico
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