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21 July 2020 Conservative plumage masks extraordinary phylogenetic diversity in the Grallaria rufula (Rufous Antpitta) complex of the humid Andes
R. Terry Chesser, Morton L. Isler, Andrés M. Cuervo, C. Daniel Cadena, Spencer C. Galen, Laura M. Bergner, Robert C. Fleischer, Gustavo A. Bravo, Daniel F. Lane, Peter A. Hosner
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Abstract

The Grallaria rufula complex is currently considered to consist of 2 species, G. rufula (Rufous Antpitta) and G. blakei (Chestnut Antpitta). However, it has been suggested that the complex, populations of which occur in humid montane forests from Venezuela to Bolivia, comprises a suite of vocally distinct yet morphologically cryptic species. We sequenced nuclear and mitochondrial DNA for 80 individuals from across the distribution of the complex to determine the extent of genetic variation between and within described taxa. Our results revealed 18 geographically coherent clades separated by substantial genetic divergence: 14 within rufula, 3 within blakei, and 1 corresponding to G. rufocinerea (Bicolored Antpitta), a species with distinctive plumage found to be nested within the complex. Neither G. rufula nor G. blakei as presently defined was monophyletic. Although 6 of the 7 recognized subspecies of G. rufula were monophyletic, several subspecies contained substantial genetic differentiation. Genetic variation was largely partitioned across recognized geographic barriers, especially across deep river valleys in Peru and Colombia. Coalescent modeling identified 17 of the 18 clades as significantly differentiated lineages, whereas analyses of vocalizations delineated 16 biological species within the complex. The G. rufula complex seems unusually diverse even among birds of the humid Andes, a prime location for cryptic speciation; however, the extent to which other dispersal-limited Andean species groups exhibit similar degrees of cryptic differentiation awaits further study.

Published by Oxford University Press for the American Ornithological Society 2020. This work is written by (a) US Government employee(s) and is in the public domain in the US.
R. Terry Chesser, Morton L. Isler, Andrés M. Cuervo, C. Daniel Cadena, Spencer C. Galen, Laura M. Bergner, Robert C. Fleischer, Gustavo A. Bravo, Daniel F. Lane, and Peter A. Hosner "Conservative plumage masks extraordinary phylogenetic diversity in the Grallaria rufula (Rufous Antpitta) complex of the humid Andes," The Auk 137(3), 1-25, (21 July 2020). https://doi.org/10.1093/auk/ukaa009
Received: 20 September 2019; Accepted: 3 February 2020; Published: 21 July 2020
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KEYWORDS
Andes
cryptic species
Grallaria rufula
Grallariidae
Rufous Antpitta
species limits
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