Abstract
The Long-tailed Reed Finch Donacospiza albifrons of south-central South America is patchily distributed in a variety of open habitats, usually near water. I present a detailed study of morphological variation based on 141 specimens, describing its plumage sequence and presenting notes on its molt and breeding. The Long-tailed Reed Finch shows no sexual dichromatism, but males average longer-winged than females. The species shows three distinct age-related plumages, which are redescribed here. It also shows marked individual variation in plumage and size, also showing marked plumage variation due to feather wear. Geographic variation is also marked, with birds from dry grasslands in northern highlands typically being larger, paler, and less streaked than birds from wet grasslands in southern lowlands, but there at some exceptions to this geographic pattern. I conclude that there is no solid basis for splitting the species into two or more taxa, and suggest considering the Long-tailed Reed Finch as a single, highly polymorphic species.
References
Armani, G.C. (1985) Guide des Passereaux Granivores—Embérizinés. Société Nouvelle des Editions Boubée, Paris, 416 pp.
Azara, F. (1805) Apuntamientos para la Historia Natural de los Páxaros del Paragüay y Rio de la Plata. Vol. 2. Imprenta de la Hija de Ibarra, Madrid, vi + 479 pp.
Azpiroz, A.B. (2012) Aves de las Pampas y Campos de Argentina, Brasil y Uruguay: un Guía de Identificacíon. Pressur, Nueva Helvecia, 351 pp.
Baldwin, S.P., Oberholser, H.C. & Worley, L.G. (1931) Measurements of birds. Scientific Publications of the Cleveland Museum of Natural History, 5, 1–164.
https://doi.org/10.5962/bhl.title.60247Barker, F.K., Burns, K.J., Klicka, J., Lanyon, S.M. & Lovette, I.J. (2013a) Going to extremes: contrasting rates of diversification in a recent radiation of New World passerine birds. Systematic Biology, 62, 298–320.
https://doi.org/10.1093/sysbio/sys094Barker, F.K., Burns, K.J., Klicka, J., Lanyon, S.M. & Lovette, I.J. (2013b) New insights into New World biogeography: an integrated view from the phylogeny of blackbirds, cardinals, sparrows, tanagers, warblers, and allies. The Auk, 132, 333–348.
https://doi.org/10.1642/AUK-14-110.1Belton, W. (1994) Aves do Rio Grande do Sul, Distribuição e Biologia. Editora Unisinos, São Leopoldo, 584 pp.
BirdLife International & Handbook of the Birds of the World (2016) Bird species distribution maps of the world. Version 6.0. BirdLife International and Handbook of the Birds of the World. Available from: http://www.birdlife.org (accessed 28 December 2016)
Blackburn, T.M., Gaston, K.J. & Loder, N. (1999) Geographic gradients in body size: a clarification of Bergmann's Rule. Diversity and Distributions, 5, 165–174.
https://doi.org/10.1046/j.1472-4642.1999.00046.xBolívar-Leguizamón, S. & Silveira, L.F. (2015) Morphological variation and taxonomy of Lepidocolaptes angustirostris (Vieillot, 1818) (Passeriformes: Dendrocolaptidae). Papéis Avulsos de Zoologia, 55, 281–316.
https://doi.org/10.1590/0031-1049.2015.55.21Brace, R.C. & Hornbuckle, J. (1998) Distributional records of and identification notes on birds of the Beni Biological Station, Beni, Bolivia. Bulletin of the British Ornithologists' Club, 118, 36–47.
Burns, K.J., Shultz, A.J., Title, P.O., Mason, N.A., Barker, F.K., Klicka, J., Lanyon, S.M. & Lovette, I.J. (2014) Phylogenetics and diversification of tanagers (Passeriformes: Thraupidae), the largest radiation of Neotropical songbirds. Molecular Phylogenetics & Evolution, 75, 41–77.
https://doi.org/10.1016/j.ympev.2014.02.006Burns, K.J., Unitt, P. & Mason, N.A. (2016) A genus-level classification of the family Thraupidae (Class Aves: Order Passeriformes). Zootaxa, 4088 (3), 329–354.
https://doi.org/10.11646/zootaxa.4088.3.2Cabanis, J. & Heine, F. (1850–1851) Museum Heineanum: Verzeichniss der Ornithologischen Sammlung des Oberamtmann Ferdinand Heine auf Gut St. Burchard vor Halberstadt. Vol. 1. Singvögel. Museum Heineanum, Halberstadt, viii + 233 pp.
Darrieu, C.A., Soave, G. & Soave, E. (1988) Nidificación de Passeriformes en la Reserva Integral de Punta Lara y sus alrededores, Buenos Aires, Argentina. El Hornero, 13, 53–58.
Darrieu, C.A. & Camperi, A.R. (1996) Estudio de una colección de aves de Corrientes (Emberizidae y Fringillidae). Neotropica (La Plata), 42, 69–75.
Darwin, C. (Ed.) (1838–1841) The Zoology of the Voyage of H.M.S. Beagle, Under the Command of Captain Fitzroy, R.N., During the Years 1832 to 1836. Part III. Birds Described by John Gould, with a Notice of Their Habitat and Ranges by Charles Darwin, and with Anatomical Appendix by T.C. Eyton. Smith, Elder & Co., London, ii + 156 pp.
de la Peña, M. (2013) Nidos y Reproducción de las Aves Argentinas. Ediciones Biológica, Santa Fe, 590 pp.
Di Giacomo, A. & Aguilar, H.A. (1987) Sobre un nuevo hospedante para la Argentina del Renegrido Molothrus bonariensis (Aves: Icteridae). Nótulas Faunísticas, Primera Serie, 4, 1–2.
Di Giacomo, A.G. (2005) Aves de la Reserva El Bagual. In: Di Giacomo, A.G. & Krapovickas, S.F. (Eds.), Historia Natural y Paisaje de la Reserva El Bagual, Provincia de Formosa, Argentina. Asociación Ornitológica del Plata, Buenos Aires, pp. 201–465.
Dunning, J.S. (1987) South American Birds: a Photographic Aid to Identification. Harrowood Books, Newtown Square, xvi + 351 pp.
Fjeldså, J. & Krabbe, N. (1990) Birds of the High Andes. Zoological Museum, University of Copenhagen, Copenhagen, 876 pp.
Freitas, G.H.S., Chaves, A.V., Costa, L.M., Santos, F.R. & Rodrigues, M. (2012) A new species of Cinclodes from the Espinhaço Range, southeastern Brazil: insights into the biogeographical history of the South American highlands. The Ibis, 154, 738–755.
https://doi.org/10.1111/j.1474-919X.2012.01268.xGibson, E. (1885) Notes on the birds of Paysandú, Republic of Uruguay. The Ibis, Series 5, 3, 275–283.
Gloger, C.L. (1833) Das Abändern der Vögel Durch Einfluss des Klima's: Nach Zoologischen, Zunächst von den Europäischen Landvögeln Entnommenen Beobachtungen Dargestellt, mit den Entsprechenden Erfahrungen bei den Europäischen Säugthieren Verglichen, und Durch Thatsachen aus dem Gebiete der Physiologie, der Physik und der Physischen Geographie Erläutert. Commission bei August Schulz und Comp., Breslau, xxix + 159 pp.
Gonzaga, L.P., Carvalhaes, A.M.P. & Buzzetti, D. (2007) A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae). Zootaxa, 1473, 25–44.
Grantsau, R. (2010) Guia Completo para a Identificação das Aves do Brasil. Vol. 2. Vento Verde, São Carlos, 643 pp. [pp. 607–1249]
Gray, G.R. (1870) Hand-list of Genera and Species of Birds, Distinguishing Those Contained in the British Museum, Part II, Conirostres, Scansores, Columbae, and Gallinae. British Museum, London, xv + 278 pp.
Hartert, E. & Venturi, S. (1909) Notes sur les oiseaux de la République Argentine. Novitates Zoologicae, 16, 159–267.
https://doi.org/10.5962/bhl.part.21963Hayes, F.E. (2001) Geographical variation, hybridization, and the leapfrog pattern of evolution in the Suiriri Flycatcher (Suiriri suiriri) complex. The Auk, 118, 457–471.
https://doi.org/10.1642/0004-8038(2001)118[0457:GVHATL]2.0.CO;2Hellmayr, C.E. (1938) Catalogue of birds of the Americas and the adjacent islands in Field Museum of Natural History, part XI, Ploceidae, Catamblyrhynchidae, Fringillidae. Field Museum of Natural History Publications, Zoological Series, 13, 1–662.
Hijmans, R.J., Cameron, S.E., Parra, J.L., Jones, P.G. & Jarvis, A. (2005) Very high resolution interpolated climate surfaces for global land areas. International Journal of Climatology, 25, 1965–1978.
https://doi.org/10.1002/joc.1276Humphrey, P.S. & Parkes, K.C. (1959) An approach to the study of molts and plumages. The Auk, 76, 1–31.
https://doi.org/10.2307/4081839James, F.G. (1970) Geographic size variation in birds and its relationship to climate. Ecology, 51, 365–390.
https://doi.org/10.2307/1935374Jaramillo, A. (2011) Donacospiza albifrons, Long-tailed Reed Finch. In: del Hoyo, J., Elliott, A. & Christie, D. (Eds.), Handbook of the Birds of the World. Vol. 16. Tanagers to New World Blackbirds. Lynx Edicions, Barcelona, pp. 616.
Lane, D.F. (2014) New and noteworthy records of birds in Bolivia. Cotinga, 36, 56–67.
Lopes, L.E. (2017) Variation of plumage patterns, geographic distribution and taxonomy of the Unicolored Blackbird (Aves: Icteridae). Zootaxa, 4221 (4), 431–456.
https://doi.org/10.11646/zootaxa.4221.4.2Lopes, L.E. & Gonzaga, L.P. (2014) Taxonomy, distribution, natural history and conservation of the Russet-mantled Foliage-gleaner Syndactyla dimidiata (Pelzeln, 1859) (Aves: Furnariidae). Zootaxa, 3754 (4) 435–449.
https://doi.org/10.11646/zootaxa.3754.4.5Lopes, L.E. & Gonzaga, L.P. (2016a) Morphological data support the recognition of four species in the genus Sirystes Cabanis & Heine, 1859 (Aves: Tyrannidae). Zootaxa, 4127 (3), 401–431.
https://doi.org/10.11646/zootaxa.4127.3.1Lopes, L.E. & Gonzaga, L.P. (2016b) Melanopareia bitorquata (d'Orbigny & Lafresnaye, 1837) is a distinct species: an appraisal of morphological variation in the Collared Crescentchest Melanopareia torquata (zu Wied-Neuwied, 1831) (Aves: Melanopareiidae). Zootaxa, 4193 (1), 138–150.
https://doi.org/10.11646/zootaxa.4193.1.6Lougheed, S.C., Freeland, J.R., Handford, P. & Boag, P.T. (2000) A molecular phylogeny of warbling-finches (Poospiza): paraphyly in a Neotropical emberizid genus. Molecular Phylogenetics and Evolution, 17, 367–378.
https://doi.org/10.1006/mpev.2000.0843Maillard, O., Vidoz, J.Q. & Herrera, M. (2008) Registros significativos de aves para el Departamento del Beni, Bolivia: parte 2. Kempffiana, 4, 8–12.
Meiri, S. (2011) Bergmann's Rule—what's in a name? Global Ecology and Biogeography Letters, 20, 203–207.
https://doi.org/10.1111/j.1466-8238.2010.00577.xMeyer de Schauensee, R. (1970) A Guide to the Birds of South America. The Academy of Natural Sciences of Philadelphia, Philadelphia, 480 pp.
Morrone, J.J. (2014) Biogeographical regionalisation of the Neotropical region. Zootaxa, 3782 (1), 1–110.
https://doi.org/10.11646/zootaxa.3782.1.1Munsell Color (2000) Munsell Soil Color Charts. Gretag Macbeth, New York, 9 pp.
Narosky, T. & Yzurieta, D. (2003) Guía para la Identificación de las Aves de Argentina y Uruguay. Vazquez Mazzini Editores, Buenos Aires, 346 pp.
Parker, T.A. III, Stotz, D.F. & Fitzpatrick, J.W. (1996) Ecological and distributional databases. In: Stotz, D.F., Fitzpatrick, J.W., Parker, T.A. III & Moskovits, D.K. (Eds.), Neotropical Birds: Ecology and Conservation. University of Chicago Press, Chicago, pp. 113–436.
Patten, M.A. & Unitt, P. (2002) Diagnosability versus mean differences of Sage Sparrow subspecies. The Auk, 119, 26–35.
https://doi.org/10.1642/0004-8038(2002)119[0026:DVMDOS]2.0.CO;2Paynter, R.A. Jr. (1989) Ornithological Gazetteer of Paraguay, 2nd ed. Museum of Comparative Zoology, Cambridge, iv + 59 pp.
https://doi.org/10.5962/bhl.title.14584Paynter, R.A. Jr. (1992) Ornithological Gazetteer of Bolivia, 2nd ed. Museum of Comparative Zoology, Cambridge, vi + 185 pp.
https://doi.org/10.5962/bhl.title.14591Paynter, R.A. Jr. (1995) Ornithological Gazetteer of Argentina, 2nd ed. Museum of Comparative Zoology, Cambridge, ix + 1043 pp.
https://doi.org/10.5962/bhl.title.14627Paynter, R.A. Jr. & Mayr, E. (Eds.) (1970) Check-list of Birds of the World. Vol. 13. Museum of Comparative Zoology, Cambridge, xiv + 443 pp.
Paynter, R.A. Jr. & Traylor, M.A. Jr. (1991) Ornithological Gazetteer of Brazil, 2 vols. Museum of Comparative Zoology, Cambridge, vii + 788 pp.
Pereyra, J.A. (1938) Aves de la zona ribereña nordeste de la Provincia de Buenos Aires. Memorias del Jardín Zoológico de La Plata, 9, 1–304.
Perlo, B. van (2009) A Field Guide to the Birds of Brazil. Oxford University Press, New York, xiv + 465 pp.
Pretelli, M.G., Isacch, J.P. & Cardoni, D.A. (2013) Year-round abundance, richness and nesting of the bird assemblage of tall grasslands in the south-east Pampas region, Argentina. Ardeola, 60, 327–343.
https://doi.org/10.13157/arla.60.2.2013.327Rensch, B. (1938) Some problems of geographical variation and species formation. Proceedings of the Linnean Society, 150, 275–285.
https://doi.org/10.1111/j.1095-8312.1938.tb00182k.xRibon, R. (2002) Colonization of eastern Brazil by the Cinereous Warbling-finch, with some comments on its natural history. In: Third North American Ornithological Conference—Abstracts. American Ornithologists' Union, New Orleans, pp. 585. [r585]
Ridgely, R.S. & Tudor, G. (1989) The Birds of South America. Vol. 1. the Oscine Passerines. University of Texas Press, Austin, xvi + 516 pp.
Ridgely, R.S. & Tudor, G. (2009) Field Guide to the Songbirds of South America: the Passerines. University of Texas Press, Austin, viii + 750 pp.
Rising, J.D. (2011) Family Emberizidae (Buntings and New World Sparrows). In: del Hoyo, J., Elliott, A. & Christie, D.A. (Eds.), Handbook of the Birds of the World. Vol. 16. Tanagers to New World Blackbirds. Lynx Edicions, Barcelona, Spain, pp. 428–683.
Rogers, D.I. (1990) The use of feather abrasion in moult studies. Corella, 14, 141–147.
Ryder, T.B. & Durães, R. (2005) It's not easy being green: using molt and morphological criteria to age and sex green-plumage manakins (Aves: Pipridae). Ornitología Neotropical, 16, 481–491.
Schimitt, C.G. & Schimitt, D.C. (1987) Extensions of range of some Bolivian birds. Bulletin of the British Ornithologists' Club, 107, 129–134.
Sclater, P.L. (1864) Descriptions of seven new species of birds discovered by the late Dr. John Natterer in Brazil. Proceedings of the Zoological Society of London, 1864, 605–611.
Sclater, P.L. & Salvin, O. (1869) Second list of birds collected at Conchitas, Argentine Republic, by Mr. William H. Hudson, together with some notes upon another collection from the same locality. Proceedings of the Zoological Society of London, 1869, 158–162.
https://doi.org/10.1111/j.1469-7998.1869.tb07309.xSharpe, R.B. (1888) Catalogue of the Passeriformes, or Perching Birds, in the Collection of the British Museum, Fringilliformes. Part III. Vol. XII. British Museum, London, 871 pp.
Shultz, A.J. & Burns, K.J. (2012) Plumage evolution in relation to light environment in a novel clade of Neotropical tanagers. Molecular Phylogenetics & Evolution, 66, 112–125.
https://doi.org/10.1016/j.ympev.2012.09.011StatSoft (2007) Statistica. Version 8.0 (Computer program). StatSoft, Inc., Tulsa.
Stattersfield, A.J., Crosby, M.J., Long, A.J. & Wege, D.C. (1998) Endemic Bird Areas of the World: Priorities for Biodiversity Conservation. BirdLife International, Cambridge, 846 pp.
Steinheimer, F.D. (2004) Charles Darwin’s bird collection and ornithological knowledge during the voyage of H.M.S. ‘‘Beagle’’, 1831–1836. Journal für Ornithologie, 145, 300–320.
https://doi.org/10.1007/s10336-004-0043-8Steinheimer, F.D., Dickinson, E.C. & Walters, M. (2006) The zoology of the voyage of HMS Beagle. Part III. Birds: new avian names, their authorship and their dates. Bulletin of the British Ornithologists' Club, 126, 171–193.
Tabachnick, B.G. & Fidell, L.S. (2007) Using Multivariate Statistics. 5th Edition. Pearson, Boston, xxviii + 980 pp.
Vanzolini, P.E. (1992) A Supplement to the Ornithological Gazetteer of Brazil. Museu de Zoologia, Universidade de São Paulo, São Paulo, 252 pp.
Vasconcelos, M.F., Lopes, L.E., Machado, C.G. & Rodrigues, M. (2008) As aves dos campos rupestres da Cadeia do Espinhaço: diversidade, endemismo e conservação. Megadiversidade, 4, 197–217.
Vieillot, L.J.P. (1817) Le Pitpit a front blanc, Sylvia albifrons. In: Sève, J.E. (Ed.), Nouveau Dictionnaire d'Histoire Naturelle, Nouvelle Édition. Vol. 11. Chez Deterville, Paris, pp. 276.
Vielliard, J.M.E. (1990) Uma nova espécie de Asthenes da Serra do Cipó, Minas Gerais, Brasil. Ararajuba, 1, 121–122.
Warren, R.L.M. & Harrison, C.J.O. (1971) Type-specimens of Birds in the British Museum (Natural History). Vol. 2. Passerines. British Museum, London, vi + 628 pp.
Wetmore, A. (1926) Observations on the birds of Argentina, Paraguay, Uruguay, and Chile. United States National Museum Bulletin, 133, 1–448.
https://doi.org/10.5479/si.03629236.133.iWhitney, B.M., Vasconcelos, M.F., Silveira, L.F. & Pacheco, J.F. (2010) Scytalopus petrophilus (Rock Tapaculo): a new species from Minas Gerais, Brazil. Revista Brasileira de Biologia, 18, 73–88.
Willis, E.O. & Oniki, Y. (2003) Aves do Estado de São Paulo. Divisa, Rio Claro, 400 pp.
Zar, J.H. (2010) Biostatistical Analysis. 5th Edition. Prentice Hall, New Jersey, xiv + 944 pp.
Zink, R.M. & Remsen, J.V. Jr. (1986) Evolutionary processes and patterns of geographic variation in birds. Current Ornithology, 4, 1–69.