Abstract
Sirystes is a widespread genus in the Neotropical region. Historically, five subspecies were recognized in a single widespread species, but more recently four separate species have been recognized, based on vocalizations and limited morphological data. In this paper, we analyze individual and geographic variation in this genus on the basis of body measurements and plumage coloration of 514 specimens, including all name-bearing types available. We conclude that the four recently proposed species, S. sibilator, S. albogriseus, S. albocinereus, and S. subcanescens, can also be diagnosed by morphological data, corroborating more recent taxonomic treatments. We identified possible hybrids between S. sibilator and S. albocinereus from a narrow zone of contact in central Bolivia. We show that Sirystes sibilator atimastus Oberholser, 1902 represents a point on a cline within S. sibilator (Vieillot, 1818), and it is here regarded as a subjective junior synonym of the latter. We also provide new observations on the range and diagnosis of S. subcanescens, a name that has been frequently misused, and present a redescription of the four recognized species, as well as reviewing their range and natural history.
References
Aleixo, A. & Guilherme, E. (2010) Avifauna da Estação Ecológica do Rio Acre, estado do Acre, na fronteira Brasil/Peru: composição, distribuição ecológica e registros relevantes. Boletim do Museu Paraense Emílio Goeldi, Ciências Naturais, 5, 279–309.
Aleixo, A., Lima, M.F.C., Castro, M., Pontes, E. & Miranda, L.S. (2011) Notes on the vertebrates of northern Pará, Brazil: a forgotten part of the Guianan Region, II. Avifauna. Boletim do Museu Paraense Emílio Goeldi, Ciências Naturais, 6, 11–65.
Allen, J.A. (1892) On a collection of birds from Chapada, Matto Grosso, Brazil, made by Mr. Herbert H. Smith. Part II—Tyrannidae. Bulletin of the American Museum of Natural History, 4, 331–350.
Angehr, G.R., Aucca, C., Christian, D.G., Pequeño, T. & Siegel, J. (2001) Structure and composition of the bird communities of the lower Urubamba Region, Peru. In: Alonso, A., Dallmeier, F. & Campbell, P. (Eds), Urubamba: the Biodiversity of a Peruvian Rainforest. Smithsonian Institution, Washington, DC, USA, pp. 151–170.
Angehr, G.R. & Dean, R. (2010) The Birds of Panama: Field Guide. Comstock Publishing Associates, Ithaca, USA, xxxii + 456 pp.
Anjos, L., Collins, C.D., Holt, R.D., Volpato, G.H., Mendonça, L.B., Lopes, E.V., Boçon, R., Bisheimer, M.V., Serafini, P.P. & Carvalho, J. (2011) Bird species abundance-occupancy patterns and sensitivity to forest fragmentation: implications for conservation in the Brazilian Atlantic forest. Biological Conservation, 144, 2213–2222.
http://dx.doi.org/10.1016/j.biocon.2011.05.013Azara, F. (1802) Apuntamientos para la Historia Natural de los Páxaros del Paragüay y Rio de la Plata, vol. 1. Imprenta de la Viuda de Ibarra, Madrid, Spain, xx + 534 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, Spain, vi + 479 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.
http://dx.doi.org/10.5962/bhl.title.60247Bedall, B.G. (1983) The isolated Spanish genius—Myth or reality? Félix de Azara and the birds of Paraguay. Journal of the History of Biology, 16, 225–258.
http://dx.doi.org/10.1007/BF00124699Belton, W. (1994) Aves do Rio Grande do Sul, Distribuição e Biologia. Editora Unisinos, São Leopoldo, Brazil, 584 pp.
Bond, J. (1947) Notes on Peruvian Tyrannidae. Proceedings of the Academy of Natural Sciences of Philadelphia, 99, 127–154.
Bond, J. & Meyer de Schauensee, R. (1941) The Birds of Bolivia, part I. Proceedings of the Academy of Natural Sciences of Philadelphia, 94, 307–391.
Cabanis, J. & Heine, F. (1859–1860) Museum Heineanum: Verzeichniss der ornithologischen Sammlung des Oberamtmann Ferdinand Heine auf Gut St. Burchard vor Halberstadt, vol. 2, Schreivögel. Museum Heineanum, Halberstadt, Germany, 176 pp.
Chapman, F.M. (1917) The distribution of bird-life in Colombia: a contribution to a biological survey of South America. Bulletin of the American Museum of Natural History, 36, 1–729.
http://dx.doi.org/10.5962/bhl.title.56497Chebez, J.C. (1996) Fauna Misionera: Catálogo Sistemático y Zoogeográfico de los Vertebrados de la Provincia de Misiones (Argentina). Editorial LOLA, Buenos Aires, Argentina, 318 pp.
Chesser, R.T. (2005) Seasonal distribution and ecology of South American austral migrant flycatchers. In: Greenberg, R. & Marra, P.P. (Eds), Birds of Two Worlds: the Ecology and Evolution of Migration. The Johns Hopkins University Press, Baltimore, USA, pp. 168–181.
Christiansen, M.B. & Pitter, E. (1997) Species loss in a forest bird community near Lagoa Santa in southeastern Brazil. Biological Conservation, 80, 23–32.
http://dx.doi.org/10.1016/S0006-3207(96)00073-0Clements, J.F. (2007) The Clements Checklist of the Birds of the World. Cornell University Press, New York, USA, 843 pp.
Cohn-Haft, M., Whittaker, A. & Stouffer, P.C. (1997) A new look at the species-poor central Amazon: the avifauna north of Manaus, Brazil. Ornithological Monographs, 48, 205–235.
http://dx.doi.org/10.2307/40157535Cracraft, J. (1983) Species concept and speciation analysis. Current Ornithology, 1, 159–187.
http://dx.doi.org/10.1007/978-1-4615-6781-3_6Darrieu, C.A. (1987) Estudios sobre la avifauna de Corrientes. IV. Nuevos registros de aves (Passeriformes: Tyrannidae) y consideraciones sobre su distribución geográfica. Neotropica (La Plata), 33, 29–35.
Davis, S.E. (1993) Seasonal status, relative abundance, and behavior of the birds of Concepción, Departamento Santa Cruz, Bolivia. Fieldiana Zoology, 71, 1–33.
http://dx.doi.org/10.5962/bhl.title.3409de Queiroz, K. (1998) The General Lineage Concept of Species, species criteria, and the process of speciation: a conceptual unification and terminological recommendations. In: Howard, D.J. & Berlocher, S.H. (Eds), Endless Forms: Species and Speciation. Oxford University Press, Oxford, UK, pp. 57–75.
de Queiroz, K. (2005) Ernst Mayr and the modern concept of species. Proceedings of the National Academy of Sciences, 102, 6600–6607.
http://dx.doi.org/10.1073/pnas.0502030102Dickinson, E.C. (Ed) (2003) The Howard and Moore Complete Checklist of the Birds of the World, 3rd ed. Princeton University Press, Princeton, USA, 1039 pp.
Dickinson, E.C. & Christidis, L. (Eds.) (2014) The Howard and Moore Complete Checklist of the Birds of the World, 4th ed., vol. 2, Passerines. Aves Press, Eastbourne, UK, lii + 752 pp.
Donegan, T. (2013) Vocal variation and species limits in the genus Sirystes (Tyrannidae). Conservación Colombiana, 19, 11–30.
Finch, D.W., Hinds, W., Sanderson, J. & Missa, O. (2002) Avifauna of the eastern edge of the eastern Kanuku Mountains, lower Kwitaro River, Guyana. In: Montambault, J.R. & Missa, O. (Eds.), A Biodiversity Assessment of the Eastern Kanuku Mountains, Lower Kwitaro River, Guyana—RAP Bulletin of Biological Assessment No. 26. Conservation International, Washington, DC, USA, pp. 43–46, 75–83.
Fitzpatrick, J.W. (2004) Family Tyrannidae (Tyrant-flycatchers). In: del Hoyo, J., Elliott, A. & Christie, D. (Eds.), Handbook of the Birds of the World, vol. 9, Cotingas to Pipits and Wagtails. Lynx Edicions, Barcelona, Spain, pp. 170–462.
Flores, B., Rumiz, D.I. & Cox, G. (2001) Avifauna del bosque semideciduo Chiquitano (Santa Cruz, Bolivia) antes y despues de aprovechamiento forestal seletivo. Ararajuba, 9, 21–31.
Fry, C.H. (1970) Ecological distribution of birds in north-eastern Mato Grosso state, Brazil. Anais da Academia Brasileira de Ciências, 42, 275–318.
Gill, F. & Donsker, D. (Eds.) (2016) International Ornithological Committee World Bird List [version 6.1]. Available from: http://www.worldbirdnames.org/ (accessed 9 February 2016)
Glick, T.F. & Quinlan, D.M. (1975) Félix de Azara: the myth of the isolated genius in Spanish science. Journal of the History of Biology, 8, 67–83.
http://dx.doi.org/10.1007/BF00129595Griscom, L. (1933) Notes on the Havemeyer collection of Central American birds. Auk, 50, 297–308.
http://dx.doi.org/10.2307/4076638Guilherme, E. & Dantas, S.M. (2011) Avifauna of the Upper Purus River, state of Acre, Brazil. Revista Brasileira de Ornitologia, 19, 185–199.
Guyra Paraguay (2005) Atlas de las Aves de Paraguay. Guyra Paraguay, Asunción, Paraguay, 212 pp.
Gyldenstolpe, N. (1950) The ornithology of the Rio Purús region in western Brazil. Arkiv för Zoologi, 2, 1–320.
Haverschmidt, F. (1968) Birds of Surinam. Oliver and Boyd, Edinburgh, Scotland, xxix + 445 pp.
Helbig, A.J., Knox, A.G., Parkin, D.T., Sangster, G. & Collinson, M. (2002) Guidelines for assigning species rank. Ibis, 144, 518–525.
http://dx.doi.org/10.1046/j.1474-919X.2002.00091.xHellmayr, C.E. (1908) An account of the birds collected by Mons. G.A. Baer in the state of Goyaz, Brazil. Novitates Zoologicae, 15, 13–102.
Hellmayr, C.E. (1927) Catalogue of birds of the Americas and the adjacent islands in Field Museum of Natural History, part V, Tyrannidae. Field Museum of Natural History Publications, Zoological Series, 13, 1–517.
Hennessey, A.B., Herzog, S.K. & Sagot, F. (2003) Lista Anotada de las Aves de Bolivia, 5th ed. Asociación Armonía, BirdLife International, Santa Cruz de la Sierra, Bolivia, 275 pp.
Hilty, S.L. (2003) Birds of Venezuela, 2nd ed. Princeton University Press, Princeton, USA, 928 pp.
Hilty, S.L. & Brown, W.L. (1983) Range extensions of Colombian birds as indicated by the M. A. Carriker Jr. collection at the National Museum of Natural History, Smithsonian Institution. Bulletin of the British Ornithologist's Club, 103, 5–17.
Hilty, S.L. & Brown, W.L. (1986) A Guide to the Birds of Colombia. Princeton University Press, Princeton, USA, 836 pp.
IUCN. (2010) Guidelines for Using the IUCN Red List Categories and Criteria, version 8.1 (August 2010). International Union for Conservation of Nature and Natural Resources, Gland, Switzerland, 85 pp.
Jahn, O. & Mena, P. (2002) Siristes Occidental Sirystes albogriseus. In: Granizo, T. (Ed.) Libro Rojo de las Aves del Ecuador. SIMBIOE, Quito, Ecuador, pp. 310–311.
Johnson, E.I., Stouffer, P.C. & Vargas, C.F. (2011) Diversity, biomass, and trophic structure of a central amazonian rainforest bird community. Revista Brasileira de Ornitologia, 19, 1–16.
Johnson, N.K., Remsen, J.V. Jr. & Cicero, C. (1999) Resolution of the debate over species concepts in ornithology: a new comprehensive biologic species concept. In: Adams, N.J. & Slotow, R.H. (Eds.), Proceedings of the 22th International Ornithological Congress. BirdLife South Africa, Durban, South Africa, pp. 1470–1482.
Karr, J.R. (1982) Avian extinction on Barro Colorado Island, Panama: a reassessment. The American Naturalist, 119, 220–239.
http://dx.doi.org/10.1086/283904Lanyon, W.E. (1978) Revision of the Myiarchus Flycatchers of South America. Bulletin of the American Museum of Natural History, 161, 427–628.
Lanyon, W.E. & Fitzpatrick, J. (1983) Behavior, morphology, and systematics of Sirystes sibilator (Tyrannidae). Auk, 100, 98–104.
Lawrence, G.N. (1862) Catalogue of a collection of birds, made in New Grenada, by James McLeannan, esq., of New York, with notes and descriptions of new species, part I. Annals of the Lyceum of Natural History of New York, 7, 288–302.
http://dx.doi.org/10.1111/j.1749-6632.1862.tb00159.xLawrence, G.N. (1867) Catalogue of a collection of birds, made in New Granada, by James McLeannan, esq., of New York, with notes and descriptions of new species, part IV. Annals of the Lyceum of Natural History of New York, 8, 1–13.
http://dx.doi.org/10.1111/j.1749-6632.1867.tb00287.xLeck, C.F. (1979) Avian extinctions in an isolated tropical wet-forest preserve, Ecuador. Auk, 96, 343–352.
Lichtenstein, H. (1823) Verzeichniss der Doubletten des Zoologischen Museums der Königl. Universität zu Berlin nebst Beschreibung vieler bisher unbekannter Arten von Säugethieren, Vögeln, Amphibien und Fischen. Zoologisches Museum, Berlin, Germany, 118 pp.
Lopes, L.E. & Braz, V.S. (2007) Aves da região de Pedro Afonso, Tocantins, Brasil. Revista Brasileira de Ornitologia, 15, 530–537.
Losada-Prado, S. & Molina-Martínez, Y.G. (2011) Avifauna del bosque seco tropical en el Departamento del Tolima (Colombia): análisis de la comunidad. Caldasia, 33, 271–294.
Mayr, E. (1969) Principles of Systematic Zoology. Tata McGraw-Hill Publishing Company, New Delhi, India, 428 pp.
McCarthy, E.M. (2006) Handbook of Avian Hybrids of the World. Oxford University Press, Oxford, UK, 608 pp.
McMullan, M. & Donegan, T. (2014) Field Guide to the Birds of Colombia, 2nd ed. ProAves, Bogota, Colombia, 396 pp.
McMullan, M. & Navarrete, L. (2013) Fieldbook of the Birds of Ecuador including the Galapagos Islands. Quito, Ecuador, 224 pp.
Mestre, L.A.M., Thom, G., Cochrane, M.A. & Barlow, J. (2010) The birds of Reserva Extrativista Chico Mendes, south Acre, Brazil. Boletim do Museu Paraense Emílio Goeldi, Ciências Naturais, 5, 311–333.
Meyer de Schauensee, R. (1945) Notes on Colombian flycatchers, manakins and cotingas. Proceedings of the Academy of Natural Sciences of Philadelphia, 97, 41–57.
Meyer de Schauensee, R. & Phelps, W.H., Jr. (1978) A Guide to the Birds of Venezuela. Princeton University Press, Princeton, USA, xxii + 424 pp.
Moojen, J., Carvalho, J.C. & Lopes, H.S. (1941) Observações sobre o conteúdo gástrico das aves brasileiras. Memórias do Instituto Oswaldo Cruz, 36, 405–444.
http://dx.doi.org/10.1590/S0074-02761941000300016Munsell. (2000) Munsell Soil Color Charts. Gretag Macbeth, New York, USA, 9 pp.
Murphy, C.S. & Amadon, D. (1959) In: memoriam: John Todd Zimmer. Auk, 76, 418–423.
http://dx.doi.org/10.2307/4082310Oberholser, H.C. (1902) Some new South American birds. Proceedings of the United States National Museum, 25, 59–68.
http://dx.doi.org/10.5479/si.00963801.1276.59Ohlson, J.I., Irestedt, M., Ericson, P.G.P. & Fjeldså, J. (2013) Phylogeny and classification of the New World suboscines (Aves, Passeriformes). Zootaxa, 3613 (1), 1–35.
http://dx.doi.org/10.11646/zootaxa.3613.1.1Olmos, F. & Britto, G.R.R. (2007) Aves da região da Barragem de Boa Esperança, médio rio Parnaíba, Brasil. Revista Brasileira de Ornitologia, 15, 37–52.
Olmos, F., Silveira, L.F. & Benedicto, G.A. (2011) A contribution to the ornithology of Rondônia, southwest of the Brazilian Amazon. Revista Brasileira de Ornitologia, 19, 200–229.
Olrog, C.C. (1949) Notas ornitologicas sobre la colección del Instituto Miguel Lillo (Tucuman). Acta Zoologica Lilloana, 8, 209–217.
Olrog, C.C. (1963) Notas sobre aves bolivianas. Acta Zoologica Lilloana, 19, 407–478.
Olson, D.M., Dinerstein, E., Wikramanayake, E.D., Burgess, N.D., Powell, G.V.N., Underwood, E.C., D'Amico, J.A., Itoua, I., Strand, H.E., Morrison, J.C., Loucks, C.J., Allnutt, T.F., Ricketts, T.H., Kura, Y., Lamoreux, J.F., Wettengel, W.W., Hedao, P. & Kassem, K.R. (2001) Terrestrial ecoregions of the World: a new map of life on Earth. BioScience, 51, 933–938.
http://dx.doi.org/10.1641/0006-3568(2001)051[0933:TEOTWA]2.0.CO;2ORNISNET. (2015) Ornithological Information System. Available from: http://www.ornisnet.org/ (accessed 2 Mar 2015)
Pacheco, J.F., Kirwan, G.M., Aleixo, A., Whitney, B.M., Whittaker, A., Minns, J., Zimmer, K.J., Fonseca, P.S.M., Lima, M.F.C. & Oren, D.C. (2007) An avifaunal inventory of the CVRD Serra dos Carajás project, Pará, Brazil. Cotinga, 27, 15–30.
Pacheco, J.F. & Olmos, F. (2005) Birds of a latitudinal transect in the Tapajós-Xingu interfluvium, eastern Brazilian Amazonia. Ararajuba, 13, 29–46.
Pacheco, J.F. & Olmos, F. (2006) As aves do Tocantins 1: região sudeste. Revista Brasileira de Ornitologia, 14, 85–100.
Pacheco, J.F. & Whitney, B.M. (2001) Um tributo ao naturalista Friederich Sellow (1789–1831). Atualidades Ornitológicas, 100, 6–7.
Parker, T.A., III, Gentry, A.H., Foster, R.B., Emmons, L.H. & Remsen, J.V. Jr. (1993) The Lowland Dry Forests of Santa Cruz, Bolivia: a Global Conservation Priority—RAP Working Papers 4. Conservation International, Washington, DC, USA, 104 pp.
Parra-Hernández, R.M., Carantón-Ayala, D.A., Sanabria-Mejía, J.S., Barrera-Rodríguez, L.F., Sierra-Sierra, A.M., Moreno-Palacios, M.C., Yate-Molina, W.S., Figueroa-Martínez, W.E., Díaz-Jaramillo, C., Florez-Delgado, V.T., Certuche-Cubillos, J.K., Loaiza-Hernández, H.N. & Florido-Cuellar, B.A. (2007) Aves del municipio de Ibagu—Tolima, Colombia. Biota Colombiana, 8, 199–220.
Parrini, R., Raposo, M.A., Pacheco, J.F., Carvalhaes, A.M.P., Melo Júnior, T.A., Fonseca, P.S.M. & Minns, J. (1999) Birds of the Chapada Diamantina, Bahia, Brazil. Cotinga, 11, 86–95.
Patten, M.A. & Unitt, P. (2002) Diagnosability versus mean differences of Sage Sparrow subspecies. Auk, 119, 26–35.
http://dx.doi.org/10.1642/0004-8038(2002)119[0026:DVMDOS]2.0.CO;2Paynter, R.A. Jr. (1982) Ornithological Gazetteer of Venezuela. Museum of Comparative Zoology, Cambridge, USA, iv + 245 pp.
http://dx.doi.org/10.5962/bhl.title.14633Paynter, R.A. Jr. (1992) Ornithological Gazetteer of Bolivia, 2nd ed. Museum of Comparative Zoology, Cambridge, USA, vi + 185 pp.
http://dx.doi.org/10.5962/bhl.title.14591Paynter, R.A. Jr. (1993) Ornithological Gazetteer of Ecuador, 2nd ed. Museum of Comparative Zoology, Cambridge, USA, xi + 247 pp.
http://dx.doi.org/10.5962/bhl.title.14626Paynter, R.A. Jr. (1997) Ornithological Gazetteer of Colombia, 2nd ed. Museum of Comparative Zoology, Cambridge, USA, ix + 537 pp.
http://dx.doi.org/10.5962/bhl.title.14638Paynter, R.A. Jr. & Traylor, M.A. Jr. (1991) Ornithological Gazetteer of Brazil, 2 vols. Museum of Comparative Zoology, Cambridge, USA, vii + 788 pp.
Phelps, W.H. & Phelps, W.H., Jr. (1963) Lista de las aves de Venezuela con su distribución, parte 2, Passeriformes, 2nd ed. Boletín de la Sociedad Venezolana de Ciencias Naturales, 24, 1–479.
Pinto, O.M.O. (1944) Catálogo das Aves do Brasil e Lista dos Exemplares Existentes na Coleção do Departamento de Zoologia, 2a parte. Ordem Passeriformes (continuação): Superfamília Tyrannoidea e Subordem Passeres. Departamento de Zoologia, Secretaria da Agricultura, Indústria e Comércio, São Paulo, Brazil, xii + 700 pp.
Pinto, O.M.O. & Camargo, E.A. (1948) Sôbre uma coleção de aves do rio das Mortes (estado de Mato Grosso). Papéis Avulsos do Departamento de Zoologia, 8, 287–336.
Pivatto, M.A., Manço, D.G., Straube, F.C., Urben-Filho, A. & Milano, M. (2006) Aves do Planalto da Bodoquena, estado do Mato Grosso do Sul (Brasil). Atualidades Ornitológicas, 129, 26.
Rêgo, M.A., Moreira-Lima, L., Silveira, L.F. & Frahnert, S. (2013) On the ornithological collection of Friedrich Sellow in Brazil (1814–1831), with some considerations about the provenance of his specimens. Zootaxa, 3616 (5), 478–484.
http://dx.doi.org/10.11646/zootaxa.3616.5.4Reis de Magalhães, J.C. (1999) As Aves na Fazenda Barreiro Rico. Plêiade, São Paulo, Brazil, 215 pp.
Remsen, J.V., Jr., Areta, J.I., Cadena, C.D., Jaramillo, A., Nores, M., Pacheco, J.F., Pérez-Emán, J., Robbins, M.B., Stiles, F.G., Stotz, D.F. & Zimmer, K.J. (2016) A Classification of the Bird Species of South America. Version [09 Feb 2016]. Available from: http://www.museum.lsu.edu/~Remsen/SACCBaseline.html (accessed 9 Feb. 2016)
Restall, R., Rodner, C. & Lentino, M. (2006) Birds of Northern South America, vol. 1, Species Accounts. Christopher Helm, London, UK, 880 pp.
Ridgely, R.S., Allnutt, T.F., Brooks, T., McNicol, D.K., Mehlman, D.W., Young, B.E., Zook, J.R. & BirdLife International. (2012) Digital Distribution Maps of the Birds of the Western Hemisphere, version 5.0. Available from: http://www.natureserve.org/getData/birdMaps.jsp (accessed 15 May 2014)
Ridgely, R.S. & Greenfield, P.J. (2001) The Birds of Ecuador, vol. 1, Status Distribution and Taxonomy. Comstock Publishing Associates, Ithaca, USA, xx + 848 pp.
Ridgely, R.S. & Gwynne, J.A. (1989) A Guide to the Birds of Panama, with Costa Rica, Nicaragua, and Honduras, 2nd ed. Princeton University Press, Princeton, USA, xvi + 534 pp.
Ridgely, R.S. & Tudor, G. (1994) The Birds of South America, vol. 2, the Suboscine Passerines. University of Texas Press, Austin, USA, xii + 814 pp.
Ridgely, R.S. & Tudor, G. (2009) Field Guide to the Songbirds of South America: the Passerines. University of Texas Press, Austin, USA, viii + 750 pp.
Robbins, M.B., Braun, M. & Finch, D.W. (2004) Avifauna of the Guyana southern Rupununi, with comparisons to other savannas of northern South America. Ornitología Neotropical, 15, 173–200.
Robbins, M.B., Parker, T.A. III & Allen, S.E. (1985) The avifauna of Cerro Pirre, Darién, Eastern Panama. Ornithological Monographs, 36, 198–232.
http://dx.doi.org/10.2307/40168283Salaman, P., Donegan, T.M. & Caro, D. (2010) Checklist of the Birds of Colombia. Fundación ProAves, Bogotá, Colombia, 73 pp.
Salvin, O. & Godman, F.D. (1888–1904) Biologia Centrali-Americana, Aves, vol. 2 (text). Taylor and Francis, London, UK, iv + 598 pp.
Santos, M.P.D., Aleixo, A., d'Horta, F.M. & Portes, C.E.B. (2011) Avifauna of the Juruti Region, Pará, Brazil. Revista Brasileira de Ornitologia, 19, 134–153.
Scholes, E. (2004) Genus Sirystes Cabanis & Heine, 1859. In: del Hoyo, J., Elliott, A. & Christie, D. (Eds.), Handbook of the Birds of the World, vol. 9, Cotingas to Pipits and Wagtails. Lynx Edicions, Barcelona, Spain, pp. 427–428.
Schubart, O., Aguirre, C. & Sick, H. (1965) Contribuição para o conhecimento da alimentação das aves brasileiras. Arquivos de Zoologia, 12, 95–249.
Schulenberg, T.S., Stotz, D.F., Lane, D.F., O'Neill, J. & Parker, T.A. III. (2007) Birds of Peru, 2nd ed. Princeton University Press, Princeton, USA, 664 pp.
Sclater, P.L. (1855) On the birds received in collections from Santa Fe di Bogota. Proceedings of the Zoological Society of London, 1855, 131–164.
Sclater, P.L. (1888) Catalogue of the Passeriformes, or Perching Birds, in the Collection of the British Museum, Oligomyodae, vol. XIV. British Museum, London, UK, xx + 494 pp + xxvi plates.
Sclater, P.L. & Salvin, O. (1880) On new birds collected by Mr. C. Buckley in eastern Ecuador. Proceedings of the Zoological Society of London, 1880, 155–159.
Sick, H. (1997) Ornitologia Brasileira. Nova Fronteira, Rio de Janeiro, Brazil, 862 pp.
Siegel, D.C. & Olson, S.L. (2008) The Birds of the Republic of Panamá, part 5, Gazetteer and Bibliography. Buteo Books, Shipman, USA, xxxiii + 516 pp.
Silveira, L.F., Develey, P.F., Pacheco, J.F. & Whitney, B.M. (2005) Avifauna of the Serra das Lontras-Javi montane complex, Bahia, Brazil. Cotinga, 24, 45–54.
Snethlage, E. (1908) Eine Vogelsammlung vom Rio Purús, Brasilien. Journal für Ornithologie, 56, 7–24.
http://dx.doi.org/10.1007/BF02089681StatSoft. (2007) Statistica, version 8.0 (Computer program). Statsoft, Inc., Tulsa, USA.
Stephens, L. & Traylor, M.A. Jr. (1983) Ornithological Gazetteer of Peru. Museum of Comparative Zoology, Cambridge, USA, vi + 271 pp.
Stephens, L. & Traylor, M.A. Jr. (1985) Ornithological Gazetteer of the Guianas. Museum of Comparative Zoology, Cambridge, USA, v + 121 pp.
http://dx.doi.org/10.5962/bhl.title.14590Stotz, D.F., Pequeño, T., Valdez, A., Mack, A., Quiroga, C. & Hoke, P. (2002) Lista de las especies de aves registradas en las Expediciones RAP en Pampas del Heath, Perú, 1996 y Alto Madidi, Bolivia, 1997. In: Montambault, J.R. (Ed.), Informes de las Evaluaciones Biológicas Pampas del Heath, Perú, Alto Madidi, Bolivia y Pando, Bolivia. Conservation International, Washington, DC, USA, pp. 89–101.
Strewe, R. (2000) New distributional sightings of 28 species of birds from Dpto. Nariño, SW Colombia. Bulletin of the British Ornithologist’s Club, 120, 189–195.
Tabachnick, B.G. & Fidell, L.S. (2007) Using Multivariate Statistics, 5th ed. Pearson, Boston, USA, xxviii + 980 pp.
Tello, J.G., Moyle, R.G., Marchese, D.J. & Cracraft, J. (2009) Phylogeny and phylogenetic classification of the tyrant flycatchers, cotingas, manakins, and their allies (Aves: Tyrannides). Cladistics, 25, 429–467.
http://dx.doi.org/10.1111/j.1096-0031.2009.00254.xThiollay, J.-M. & Jullien, M. (1998) Flocking behaviour of foraging birds in a neotropical rain forest and the antipredator defence hypothesis. Ibis, 140, 382–394.
http://dx.doi.org/10.1111/j.1474-919X.1998.tb04599.xTodd, W.E.C. (1920) Descriptions of apparently new South American birds. Proceedings of the Biological Society of Washington, 33, 71–76.
Tostain, O., Dujardin, D.-L., Érard, C. & Thiollay, J.-M. (1992) Oiseaux de Guyane. Sociét d'Études Ornithologiques, Brunoy, France, 222 pp.
Traylor, M.A. (1958) Birds of northeastern Peru. Fieldiana Zoology, 35, 87–141.
Traylor, M.A. Jr. (Ed) (1979) Check-list of Birds of the World, vol. 8. Museum of Comparative Zoology, Cambridge, USA, xv + 365 pp.
Urban, I., Eichler, A.W., Endlicher, S., Fenzl, E. & Martius, C.F.P., von (1906) Flora Brasiliensis Enumeratio Plantarum in Brasilia, vol. 130, Vitae Itineraque Collectorum Botanicorum, Notae Collaboratorum Biographicae, Florae Brasiliensis Ratio Edendi Chronologica, Systema, Index Familiarum. R. Oldenbourg, Munich, Germany, 268 pp.
Vanzolini, P.E. (1992) A Supplement to the Ornithological Gazetteer of Brazil. Museu de Zoologia, Universidade de São Paulo, São Paulo, Brazil, 252 pp.
Vasconcelos, M.F. & D’Angelo Neto, S. (2007) Padrões de distribuição e conservação da avifauna na região central da Cadeia do Espinhaço e áreas adjacentes, Minas Gerais, Brasil. Cotinga, 28, 27–44.
Vidoz, J.Q., Jahn, A.E. & Mamani, A.M. (2010) The avifauna of Estación Biológica Caparú, Bolivia. Cotinga, 32, 51–68.
Vieillot, L.J.P. (1818) Le Moucherollesiffleur, Muscicapa sibilator. In: Sève, J.E. (Ed.), Nouveau dictionnaire d'histoire naturelle, nouvelle édition, vol. 21. Chez Deterville, Paris, France, pp. 457.
Walker, B., Stotz, D.F., Pequeño, T. & Fitzpatrick, J. (2006) Birds of the Manu Biosphere Reserve. In: Patterson, B.D., Stotz, D.F. & Solari, S. (Eds.), Mammals and Birds of the Manu Biosphere Reserve, Peru. Fieldiana Zoology, New Series, No. 110. Field Museum, Chicago, USA, pp. 23–49.
Wetmore, A. (1972) The birds of the Republic of Panamá, part 3, Passeriformes: Dendrocolaptidae (Woodcreepers) to Oxyruncidae (Sharpbills). Smithsonian Miscellaneous Collections, 150, 1–631.
Willis, E.O. (1976) Effects of a cold wave on an Amazonian avifauna in the upper Paraguay drainage, Western Mato Grosso, and suggestions on oscine-suboscine relationships. Acta Amazonica, 6, 379–394.
Willis, E.O. & Oniki, Y. (1990) Levantamento preliminar das aves de inverno em dez áreas do sudoeste de Mato Grosso, Brazil. Ararajuba, 1, 19–38.
Willis, E.O. & Oniki, Y. (2003) Aves do Estado de São Paulo. Divisa, Rio Claro, Brazil, 400 pp.
Zar, J.H. (2010) Biostatistical Analysis, 5th ed. Prentice Hall, New Jersey, USA, xiv + 944 pp.
Zimmer, J.T. (1937) Studies of Peruvian birds. No. XXVII. Notes on the genera Muscivora, Tyrannus, Empidonomus, and Sirystes, with further notes on Knipolegus. American Museum Novitates, 962, 1–28.
Zimmer, K.J., Parker, T.A., III, Isler, M.L. & Isler, P.R. (1997) Survey of a southern Amazonian avifauna: the Alta Floresta region, Mato Grosso, Brazil. Ornithological Monographs, 48, 887–918.
http://dx.doi.org/10.2307/40157573Zink, R.M. & Remsen, J.V. Jr. (1986) Evolutionary processes and patterns of geographic variation in birds. Current Ornithology, 4, 1–69.