Morphology and vocalization support specific status of the Chestnut-headed Chachalaca, Ortalis motmot ruficeps (Wagler, 1830) (Aves; Galliformes; Cracidae)

Authors

DOI:

https://doi.org/10.11606/1807-0205/2020.60.12

Keywords:

Morphology, Plumage, Voice, Little Chachalaca

Abstract

The Little Chachalaca (Ortalis motmot) is a widely distributed species in the Amazon basin, typically found in riverine habitats. There are two disjunct populations: the northern O. m. motmot and the southern O. m. ruficeps (known as Chestnut-headed Chachalaca). Here we performed a vocal, morphological and plumage comparison between these two taxa. Birds present differences in tail coloration but are otherwise undiagnosable in terms of plumage. Ortalis m. ruficeps is, however, markedly smaller and lighter than O. m. motmot, with no overlap in size or weight. We also found vocal differences between O. m. motmot and O. m. ruficeps, no overlap in geographic distributions and no signs of hybridization across its range. Based on the available data, Ortalis m. ruficeps thus must be considered a valid species, endemic to Brazil.

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Author Biographies

Barbara Mizumo Tomotani, Museum of New Zealand Te Papa Tongarewa - Wellington, New Zealand.

169 Tory Street, 6011, Wellington, New Zealand.

Luís Fábio Silveira, Universidade de São Paulo (USP), Museu de Zoologia (MZUSP) - São Paulo, SP, Brasil.

Avenida Nazaré, 481, Ipiranga, CEP 04263-000, São Paulo, SP, Brasil.

José Fernando Pacheco, Comitê Brasileiro de Registros Ornitológicos (CBRO) - Rio de Janeiro, RJ, Brasil.

Rua Bambina, 50, Apartamento 104, Botafogo, CEP 22251-050, Rio de Janeiro, RJ, Brasil.

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Published

2020-03-19

How to Cite

Tomotani, B. M., Silveira, L. F., & Pacheco, J. F. (2020). Morphology and vocalization support specific status of the Chestnut-headed Chachalaca, Ortalis motmot ruficeps (Wagler, 1830) (Aves; Galliformes; Cracidae). Papéis Avulsos De Zoologia, 60, e20206012. https://doi.org/10.11606/1807-0205/2020.60.12

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