MtDNA Sequences Support Monophyly of Hemispingus Tanagers

摘要

Tanagers of the genus Hemispingus comprise an array of 12 recognized species of rather dull-colored tanagers restricted to Andean forests. Four of these species are polytypic, with as many as seven subspecies recognized for H. superciliaris. Taxonomic relationships within this group, and with similar-looking Basileuterus warblers, have been confusing and not well understood. We used partial DNA sequences of the mitochondrial ND2 gene and a set of morphological characters t study their phylogenetic relationships. Our molecular dataset strongly supports the monophyly of Hemispingus (including the warblerlike species and the finch-like H. rufosuperciliaris) compared to other nine-primaried oscines (Ramphocelus, Chlorospingus, Atlapetes/Buarremon, Basileuterus) and indicates either that Atlapetes/Buarremon could be tanagers or that Chlorospingus could be finches. We propose a phylogeny containing three major clades: mostly greenish eye-browed birds (trifasciatus, atropileus, auricularis, calophrys), mostly gray warbler-like birds (superciliaris, verticalis, xanthophthalmus), and mostly ochraceous birds (rufosuperciliaris and goeringi, piurae, frontalis, melanotis). The relationships among these three clades are left unresolved. We suggest species status for H. auricularis and H.piurae. Our molecular data suggest that most of the diversity in Hemispingus tanagers predates the period of marked ecoclimatic fluctuations in the upper Pleistocene.