Systematics of the Tawny-Bellied Seedeater (Sporophila hypoxantha). II. Taxonomy and Evolutionary Implications of the Existence of a New Tawny Morph

The condor

Juan Ignacio Areta¹ 

关键词: Sporophila;    capuchinos;    habitat;    morph;    radiation;    regiolect;    taxonomy;   

DOI  :  10.1525/cond.2011.100059

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. The capuchinos, a subset of the genus Sporophila, represent a radiation of seedeaters characterized by little genetic differentiation, virtually no change in bill and body shape, marked plumage differences on a common theme, and notable differentiation in vocalizations and habitat use. We describe a distinctive variant that would have been considered a species by the traditional strictly phenotypical criteria for classification of species in the genus. This variant resembles the Tawny-bellied Seedeater (S. hypoxantha) but has a tawny, not gray, nape and back. It is also identical in pattern to the Chestnut Seedeater (S. cinnamomea) but has a tawny rather than chestnut body. We tested four hypotheses to assess the status of the variant: that it represents a new species, a hybrid S. hypoxantha × S. cinnamomea, a color morph of S. cinnamomea, or a color morph of S. hypoxantha. The variant is identical to S. hypoxantha in vocalizations and habitat use, varying geographically in parallel. Both forms ...

【 授权许可】

CC BY