Species Limits in Cranioleuca vulpina

New information on the vocalizations, behavior, and habitat of populations of the Rusty-backed Spinetail (Cranioleuca vulpina) reveal that it actually consists of two species-level taxa: a wide-ranging, polytypic species (C. vulpina) that occupies várzea and riverine forests and flooded savanna wood...

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Bibliographic Details
Published in:Ornithological monographs 1997-01 (48), p.849-864
Main Author: Zimmer, Kevin J.
Format: Article
Language:English
Subjects:
Alopecia
Animal vocalization
Archipelagos
Bird songs
Birds
Foraging
Forest habitats
Ornithology
Riverine habitats
Taxa
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Summary:New information on the vocalizations, behavior, and habitat of populations of the Rusty-backed Spinetail (Cranioleuca vulpina) reveal that it actually consists of two species-level taxa: a wide-ranging, polytypic species (C. vulpina) that occupies várzea and riverine forests and flooded savanna woodlands north and south of the Amazon, and a more specialized form (C vulpecula) restricted to successional habitats on islands in the Amazon and its major white-water tributaries. Long considered a subspecies of C. vulpina, C. vulpecula is shown to be morphologically, vocally, and ecologically distinct from sympatrically distributed populations, with no evidence of intergradation. I found C. vulpecula to be common on Ilha Marchantaria in the Rio Solimões near Manaus, Brazil, a major eastward extension of its known range. One form or another of C. vulpina occupies the adjacent "mainland" banks of the river north and south of Marchantaria, as well as black-water islands in the nearby Rio Negro. /// Novas informações sobre vocalizações, comportamento, e habitat de populações do joão-do-rio (Cranioleuca vulpina) revelam que este taxon contém duas espécies: uma (C vulpina) politípica, de ampla distribuiçāo, habitando várzea, mata de galeria, e savanas inundáveis ao norte e sul do Rio Solimões-Amazonas, e a outra (C. vulpecula) especializada em ambientes sucessionais de ilhas no Rio Solimões e seus principais afluentes de água branca. Cranioleuca vulpecula, por muito tempo tratada como subespécie de C. vulpina, é morfologicamente, vocalmente, e ecologicamente distinta de populações simpátricas de C. vulpina, sem evidência de intergradação. Cranioleuca vulpecula é comúm na Ilha Marchantaria no Rio Solimões em frente a Manaus, Amazonas, Brasil, ou outra de C. vulpina ocorre em áreas adjacentes, nas margens do rio e nas ilhas de água preta do Rio Negro.
ISSN:0078-6594
1941-2282
DOI:10.2307/40157571