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Juan Mazar Barnett 1975 - 2012

Fern Davies

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De Aves Argentina:


Adiós a un gran amigo, Juancito Mazar Barnett

Hoy es un día de gran tristeza para Aves Argentinas y para toda la comunidad ornitológica mundial.


Lamentamos comunicar el fallecimiento de uno de nuestros socios más queridos, uno de nuestros jóvenes ornitólogos más talentosos, Juan Mazar Barnett.


A pesar de su juventud, Juan ha sido sin lugar a dudas una de las figuras mas destacadas de la ornitología de nuestro país de los últimos años, con grandes contribuciones a la ornitología sudamericana.

A todos sus amigos de Aves Argentinas se nos hace difícil entender esta pérdida tan temprana.


Se fue un amigo entrañable que extrañaremos por siempre.




Farewell to a great friend, Juan Mazar Barnett


Today is a day of great sadness for Aves Argentinas and the entire world ornithological community.

We regret to announce the death of one of our most beloved, one of our most talented young ornithologists, Juan Mazar Barnett.


Despite his youth, John has been without doubt one of the most prominent figures of the ornithology of our country in recent years, with major contributions to South American ornithology.

To all friends of Aves Argentinas is difficult for us to understand this loss so early.


He was a dear friend who missed forever.





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  • 4 years later...
In Memoriam: Juan Mazar Barnett, 1975–2012


Juan Mazar Barnett, known also as Juancito, was a rare character. One of those natural wonders that appears from nowhere, then slips from view without farewells, leaving a strong mark on all who met him. It would be a disservice to remember merely his vast ornithological knowledge without first mentioning his capacity to marvel at the natural world and his need to share that admiration with other human beings.

Juan was born in March 1975, in Buenos Aires, Argentina, and was touched by the avian world at the age of nine. Knowing Juan, I can only wonder how he had managed to survive nine years without birds. In his own words, he got into birds “after going through a dinosaur phase, an airplane phase, and then a general wildlife phase, in that order.” But Juan was a born ornithologist, and everyone knew that, even 30 years ago. Juancito rapidly gained fame among fellow members of the Asociación Ornitológica del Plata (today Aves Argentinas) as the boy that knew the scientific name of every Argentine bird. No matter which plate in the bird book the old ladies pointed to, the society's youngest member knew its name (both Spanish and scientific), range, patterns of migration, diagnostic characters, abundance, and where one had to go to see the really rare ones (depicted on the last page). No matter the subject, if it was about birds, he knew all the details.

If during his childhood Juan was unanimously seen as a gifted boy, in his teenage years he established himself as perhaps the most complete field ornithologist of his generation. Older members of the society would come to him with extensive field notes that he would rapidly transform into a bird name, or, in the absence of proper data, he would politely ask whether the shape of the bill or any other distinctive character was noted. His patience and politeness transformed him into a virtual guru for seasoned and novice birders alike, and in 1996 he was awarded the Young Ornithologists' Award by the Asociación Ornitológica del Plata, the association that had witnessed his growth.

Juan's field's experience was unbeatable. During his early years as a birder he visited every corner of his home country in search of the feathered wonders that he knew so well from books. Once he entered “the bird phase” he never stopped exploring. I could devote many pages to listing the places that Juan visited during his youth; each one of his trips is carefully described in his more than 20 field catalogs that remain in his office. His first birding trip was to northern Patagonia (Lanin National Park) in 1985, when he was almost ten years old. This trip was followed by many others to different regions, including the lowland subtropical forests of Iguazú Falls, the Yungas and cloud forests of Calilegua, the shrubby thorny habitats of the Chaco, the shorebird paradise of Punta Rasa, the Patagonian steppes of the Peninsula de Valdés, the araucano forests of southern Patagonia, the marshes of Esteros del Iberá, or the Puna highlands of Jujuy. Along with bird lists and descriptions of sites, his field catalogs are filled with beautiful drawings, careful behavioral notes, descriptions of nests, eggs, chicks, and anything that drew the attention of the young naturalist. Those notes, if properly used, should provide outstanding data for the future.


His natural curiosity led him to read most of the avian literature available, and his presence at the society's library was constant. His preferred subjects were the fields of biogeography, taxonomy, systematics, and conservation, although natural history remained high too. Over the years, Juan developed a critical mind that remained with him throughout his life. Juan never accepted statements without questioning them; even as a young boy, he sharply criticized inconsistencies in the only field guide for Argentina available at the time. Some of his book reviews are masterpieces (Mazar Barnett 1997ab1999c2000acd2001a20022003acd). His sharp eye invariably exposed any inconsistencies, but his most passionate attacks were directed at sloppiness, a fault he could not accept. On the other hand, he was never short of praise when he felt that other people's achievements merited it.

His first scientific articles reported nothing less than a series of first records for Argentina, including those of the Sooty Grassquit (Tiaris fuliginosa) (Mazar Barnett and Herrera 1996), Giant Conebill (Oreomanes fraseri) (Mazar Barnett et al. 1998d), and Pink-footed Shearwater (Puffinus creatapus), the latter based on a specimen “forgotten” in the drawers of the Museo Argentino de Ciencias Naturales in Buenos Aires (Mazar Barnett and Navas 1998). These discoveries were followed by the first Brazilian record of the Terek Sandpiper (Xenus cinereus), an Old World shorebird that strayed to the tropics coincidentally with Juan (Mazar Barnett 1997b), as well as several new birds for Paraguay (Lowen et al. 1997a, b). He also published several articles addressing the natural history and distribution of many Argentine birds (Mazar Barnett 1999ab20012003Roesler and Mazar Barnett 2004Areta et al. 2006Lowen et al. 2009Lowen and Mazar Barnett 2010). In 2001, Juan and Mark Pearman published an Annotated Checklist of the Birds of Argentina (Mazar Barnett and Pearman 2001), which has become established as the country's official bird list (Mazar Barnett and Pearman 2009).

After several years of exploring the pampas and other Argentine landscapes, it was time for him to visit other countries. Between 1995 and 1998 Juan made several trips to Paraguay, which resulted in more discoveries and several publications (Lowen et al. 1997a, b, Capper et al. 2001abClay et al. 2001Mazar Barnett et al. 20022004aMazar Barnett and Madroño 2003). He then went to Bolivia and surveyed the dry valleys of Cochabamba in 1999 and 2000, calling attention to a cryptic species of Tyrannidae in the genus Serpophaga (Herzog and Mazar Barnett 2004). And then came Brazil. This country, like no other, offered Juan a mixture of dry habitats, luxuriant forests, and many threatened and range-restricted species that he learned to identify with a swift and impressive authority. In Brazil, he worked in most biomes, including the Atlantic Forest, the Cerrado, the Caatinga, the Pantanal, and Amazonia, publishing many articles with a productive network of collaborators, most of whom were close personal friends (Mazar Barnett 2000bNaka et al. 200020012007Kirwan et al. 2001ab2004Raposo et al. 2002Buzzetti and Mazar Barnett 2003Mazar Barnett et al. 20032004bWhitney et al. 2003Mazar Barnett and Kirwan 2004Stouffer et al. 2011). More recently, Juan joined the advisory committee of the Wildlife Conservation Society's “Birds of Brazil” series of field guides (Gwynne et al. 2010). Although many trips surely left a mark on Juan's personality, his journey to the thorny interior of Bahia (northeastern Brazil) in 1997 was particularly memorable. It is impossible to forget Juan's excitement on first glimpsing the last wild Spix's Macaw (Cyanopsitta spixii, a species now extinct in the wild), flying from tree to tree.

For many years, his main interest seemed to be in finding rare or lost species, including many without records for decades. He first co-authored notes on the rare Plushcap (Catamblyrhynchus diadema) (DiGiacomo et al. 1997), a bird with just a handful of previous records for Argentina. Subsequently he described the ghostly presence of the Lyre-tailed Nightjar (Uropsalis lyra) in Argentina (Mazar Barnett et al. 1998c) and published notes on other very rare birds from the Andes (Mazar Barnett et al. 1998a2001), several of which were known in Argentina from just one or two records. His most important records, however, included those birds either lost to science or generally considered to be extinct. One of these is the Austral Rail (Rallus antarcticus), which remained unseen for 40 years until Juan and his friends Santiago Imberti, Marco Delia Seta, and Germán Pugnali rediscovered it in the marshes of southern Patagonia (Mazar Barnett et al. 1998b) and Chile (Imberti y Mazar Barnett 1999). Juan also played a role in locating a new population of the extremely rare White-winged Nightjar (Eleothreptus candicans), which remained elusive in the Paraguayan savannas, until its rediscovery in 1995 (Clay et al. 19982001Capper et al. 2001a). In Brazil, Juan was instrumental in documenting the rediscovery of another lost bird, Kaempfer's Tody-Tyrant (Hemitriccus kaempferi), an understory species previously unknown in life, its existence resting solely in the type specimen collected by Kaempfer himself in 1929 and a second bird collected by H. F. Berla in 1950 but noticed by scientists only in the early 1990s (Mazar Barnett et al. 2000Buzzetti et al. 2003ab). With these credentials, Juan was optimistic about the survival in Paraguay of a small population of the Glaucous Macaw (Anodorhynchus glaucus), a bird that has been considered extinct since the mid-19th century. Two unidentified dark macaws seen and tape-recorded in flight during his field work in Paraguay ignited this hope.

During those productive years, Juan paid special attention to avian vocalizations, making a substantial collection of recordings. In fact, one would never expect to find him in the woods without his tape recorder. His recordings, often of outstanding quality, can be heard on a variety of publications, such as “Birds of Bolivia” (Mayer 2000), “Sonidos de aves de Calilegua” (Krabbe et al. 2001), or “Bird sounds of Argentina and adjacent areas” (Imberti et al. 2009), which he coauthored. Juan's generosity in sharing his data is apparent from his many recordings that are freely available for downloading (www.xeno-canto.org), even as popular ringtones through the Center of Biological Diversity's website (http://www.biologicaldiversity.org/).

Although Juan had an exceptionally scientific mind, the idea of spending his precious days in a demanding six-year undergraduate course in biology at the Universidad de Buenos Aires was far from appealing. Fortunately, friends like Guy Kirwan and James Lowen, with whom he worked in Paraguay, convinced him of the importance of a formal education, and in 1999 Juan flew to Norwich, UK, to work torward a bachelor of science at the prestigious University of East Anglia. He graduated with first class honors in ecology and biology in 2001, presenting a pioneering molecular study on the “Taxonomy and biogeography of the South American species of the genus Picoides.” Besides yielding his bachelor's degree, his three years in Europe were important for his professional life, as he worked in the Threatened Birds of the World program of BirdLife International at Cambridge and was a member of the editorial board of the journal Cotinga, published by the Neotropical Bird Club.

Following his return from the UK in 2001, Juan devoted most of his time to leading birding tours in South America. For a few years, it proved to be the perfect life for him, as he visited some of the most fascinating parts of the Americas. His fluency in English, Spanish, and Portuguese, along with his unparalleled bird knowledge and empathy with tourists, rapidly transformed him into one of the most popular tour guides in the market. Together with some of his life-long friends (Germán Pugnali, Hernán Rodríguez Goñi, and Hernán Casañas), he founded Seriema Nature Tours. He spent months at a time in the field, visiting every corner of southern South America and Brazil, as well as making several trips to Antarctica, which touched Juan, perhaps more than any other place on earth, with the raw beauty of nature. Away from South America, Juan did not pay too much attention to birds, and he enjoyed remarking on how few times he had been birding in the UK. On the other hand, trips to more exciting destinations, such as Cuba, Honduras, China, and Borneo sparked his interest in “foreign” birds.

In addition to being a full-time birding guide, Juan worked on several conservation projects, in both Argentina and Brazil. His collaboration with the Sociedade para a Conservação das Aves (the partner of BirdLife International in Brazil) was particularly fruitful. Between 1999 and 2003 he made several trips to the Brazilian northeast, researching possibly the greatest environmental tragedy of our time: the almost complete destruction of the wonderful Atlantic forests of Pernambuco and Alagoas, well known for their many endemics and highly endangered species. During his trips to that region, together with his friend Dante Buzzetti, Juan made some of his greatest ornithological discoveries, including three species possibly new to science that his friends and collaborators should publish in the near future. In fact, much of his energy in his last years was devoted to the description of one of those new species, which apparently is critically endangered but had passed unnoticed by dozens of topnotch ornithologists in one of the most visited patches of the Brazilian northeast. The team of researchers, however, experienced first-hand the conflict between collecting the specimen needed for the formal description of a new bird and trying to gather additional data in the hope that every individual in the wild would contribute to the survival of the species, already on the brink of extinction. Although Juan witnessed the brutal destruction of the Atlantic forest, he remained optimistic, as his article “Renewed hope for the threatened avian endemics of northeastern Brazil” suggests (Mazar Barnett et al. 2005).

From 2004 onward, Juan's ornithological adventures were punctuated by health problems. His body had to fight an immunological disease that kept him far from the field for several months at a time. Typical diseases that a healthy person could fight effectively turned into long and complicated battles. The final one that took him away was meningitis. Nevertheless, his last months were intellectually intense. Juan formed part of the Condor's editorial board for Latin America, and his efforts were important in increasing the number of publications by Latin American researchers in top journals. Additionally, Juan had decided to devote less time to guiding tours and finally join a Ph.D. program. His plan was to study the endemic and endangered birds of the Brazilian northeast, which include the gritador-do-nordestehis new species, yet undescribed. Those forest fragments represent the fight for survival of wounded nature, a forest that lacks its natural defenses and needs our help to survive. Juan was ready for the fight, not only for saving his own life, but also to preserve the last patches of an amazing forest.

Juan will no longer make us laugh, lead our way to rediscover birds thought extinct, or shine a light in what for us were dark corners, but his love of nature will continue to inspire us. From a professional standpoint, Juan was the pride of a generation. He had a rare gift for understanding birds, and somehow to know how to look for them, even ones no one had seen in decades. With more than 50 scientific articles, he made a lasting contribution to the ornithology of the Neotropical Region. Juan had an exceptional life; he was master of his time, and his characteristic sense of humor won over dozens of good friends. “And because birds are not everything,” as he stated a few months before he died, we can also remember him having his favorite drink, a Brazilian suco de maracujá (passion fruit juice), talking enthusiastically about music and fine art, and wearing his U2 t-shirt, something that he “enjoyed as much as most of the birding I've done.”


I am deeply indebted to Cristina Ollua, Juan's mother, for sharing many details that were essential to reconstructing, even if in a very superficial way, our friend's life. Many of his friends also helped me write this little story, and I am thankful to Germán Pugnali, Hernán Rodríguez Goñi, Hernán Casañas, Adrian Di Giacomo, Santiago Imberti, Rosendo Fraga, and Santiago Claramunt for having read and commented earlier drafts. Sebastian Herzog, Rob Clay, Guy Kirwan, and Weber Girão also helped me with details of his trips to Bolivia, Paraguay, the UK, and Brazil, respectively. And finally I thank Juan, for giving us the honor of sharing his life with us and continuing to inspire us.—LUCIANO N. NAKA, Laboratório de Ornitologia, Departamento de Zoologia, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.

Areta, J. I., Vila Moret, S., Mazar Barnett, J. and H. Casañas. 2006Primer registre de nidificación del Picaflor Andino Castaño (Oreotrochilus adela) en Argentina. Nuestras Aves 51:2123
Buzzetti, D. R. C., and J. Mazar Barnett. 2003Description of the nest and eggs of two Myrmeciza antbirds endemic to the Atlantic Forest of Brazil. Cotinga 20:8993.
Buzzetti, D. R. C., J. Mazar Barnett, and G. M. Kirwan. 2003Photospot: Kaempfer's Tody-tyrant Hemitriccus kaempferi. Cotinga 20:9597.
Capper, D. R., R. P. Clay, A. Madroño Nieto, and J. Mazar Barnett. 2001aNew information on the distribution of twenty-two bird species in Paraguay. Ararajuba 9:5759.
Capper, D. R., R. P. Clay, A. Madroño Nieto, J. Mazar Barnett, I. J. Burfield, E. Z. Ezquivel, C. P. Kennedy, M. Z. Perrens, and R. G. Pople. 2001First records, noteworthy observations and new distributional data for birds in Paraguay. Bulletin of the British Ornithologists' Club 121:2337.
Clay, R. P., D. R. Capper, J. Mazar Barnett, I. J. Burfield, E. Z. Esquivel, R. Fariña, C. P. Kennedy, M. Perrens, and R. G. Pople. 1998White-winged Nightjars Caprimulgus candicans and cerrado conservation: the key findings of Project Aguara Ñu 1997. Cotinga 9:5256.
Clay, R. P., B. López Lanús, J. A. Tobias, J. Mazar Barnett, and J. C. Lowen. 2001The display of the White-winged Nightjar. Journal of Field Ornithology 71:619626.
Di Giacomo, A. G., A. S. Di Giacomo, J. Mazar Barnett, and B. López Lanús. 1997Nuevas citas de Catamblyrhynchus diadema en el noroeste argentino. Hornero 14:264266.
Gwynne, J. A., R. S. Ridgely, G. Tudor, and M. Argel. 2010Birds of Brazil: the Pantanal & Cerrado of central Brazil. Cornell University PressIthaca, NY.
Imberti, S., J. I. Areta, M. Pearman, J. Mazar Barnett, G. Pugnali, I. Roesler, D. Monteleone, H. Casañas, and H. Rodríguez Goñi. 2009Bird sounds of Argentina and adjacent areas. Disc 1: Patagonia, Antarctica, and the South Atlantic Islands. WildSounds, Salthouse, England.
Imberti, S., and J. Mazar Barnett. 1999Redescubrimiento del Pidén Austral Rallus antarcticus en Chile. Boletín Chileno de Ornitología 6:4445.
Kirwan, G. M., and J. Mazar Barnett. 2001aNew bird records from north-east Brazil. Cotinga 15:6768.
Kirwan, G. M., J. Mazar Barnett, and J. Minns. 2001bSignificant ornithological observations from the Rio São Francisco Valley, Minas Gerais, Brazil, with notes on conservation and biogeography. Ararajuba 9:145161.
Kirwan, G. M., J. Mazar Barnett, M. F. Vasconcelos, M. A. Raposo, S. D'Angelo-Neto, and I. Roesler. 2004Further comments on the avifauna of the middle São Francisco Valley, Minas Gerais, Brazil. Bulletin of the British Ornithologists' Club 124:207220.
Krabbe, N., J. Mazar Barnett, A. L. Sureda, and A. Lacci. 2001Sonidos de aves de Calilegua. Editorial L.O.L.A, Buenos Aires.
Lowen, J. C., R. P. Clay, J. Mazar Barnett, N. A. Madroño Nieto, M. Pearman, B. López Lanús, J. A. Tobias, D. C. Liley, T. M. Brooks, E. Z. Esquivel, and J. M. Reid. 1997New and noteworthy observations on the Paraguayan avifauna. Bulletin of the British Ornithologists' Club 117:275293.
Lowen, J. C., and J. Mazar Barnett. 2010Comentários sobre aves pampeanas y otras especies de interés en un “nuevo” sitio de interés en la Provincia de Buenos Aires, la Estancia Rincón de Cobo. Nuestras Aves 55:1214.
Lowen, J. C., J. Mazar Barnett, and M. Pearman. 2009Nueva información sobre la distribución del Chorlito Ceniciento (Pluvianellus socialisy del Doradito Copetón (Pseudocolopteryx sclateri) en la provincia de Buenos Aires. Nuestras Aves 54:6971.
Lowen, J. C., J. Mazar Barnett, M. Pearman, R. P. Clay, and B. M. López Lanús. 1997New distributional information for 25 species in eastern Paraguay. Ararajuba 5:234237
Mayer, S. 2000Birds of Bolivia/Aves de Bolivia, 2.0. CD-ROM. Bird Songs InternationalWesternieland, the Netherlands.
Mazar Barnett, J. 1997a Comentarios bibliográficos (do Rosário: as aves em Santa Catarina. Distribução geogrãfica e meio ambiente). Hornero 14:281.
Mazar Barnett, J. 1997bFirst report of Xenus cinereus (Charadriiformes: Scolopacidae) for Brazil. Ararajuba 5:236237.
Mazar Barnett, J. 1997cBook review (Narosky & Bosso 1995: Manual del observador de aves). Cotinga 8:104105.
Mazar Barnett, J. 1998Book review (del Hoyo et al. 1996: Handbook of the birds of the world, vol. 3). Cotinga 9:9395.
Mazar Barnett, J. 1999aLa raza puneña del Junquero (Phleocryptes melanops schoenobaenus) en la Argentina. Nuestras Aves 40:13.
Mazar Barnett, J. 1999bRegistre extralimital de la Mosqueta Pico Curvo (Phyllomyias burmeisteri). Nuestras Aves 40:13.
Mazar Barnett, J. 1999cBook review (de la Peña & Rumboll 1998: Birds of southern South America and Antarctica). Cotinga 11:108110.
Mazar Barnett, J. 2000aComentarios bibliográficos (Isler e Isler: The tanagersnatural historydistributionand identification). Hornero 15:155.
Mazar Barnett, J. 2000bAn extralimital record of Ocellated Crake Micropygia schomburgkii from coastal São Paulo, Brazil. Ararajuba 8:141142.
Mazar Barnett, J. 2000cBook review (Harris 1998: A guide to the birds and mammals of coastal Patagonia).Cotinga 13:8990.
Mazar Barnett, J. 2000dBook review (Chantier & Driessens 2000: Swifts: a guide to the swifts and treeswifts of the world). Cotinga 16:109.
Mazar Barnett, J. 2001aComentarios bibliográficos: Aves del mundo (del Hoyo et al.: Handbook of the birds of the world. Volume 4: sandgrouse to cuckoos). Hornero 16:5657.
Mazar Barnett, J. 2001bNuevo registre del picaflor andino (Oreotrochilus leucopleurus) para Santa Cruz (Argentina). Nuestras Aves 41:31.
Mazar Barnett, J. 2002Comentarios bibliográficos: Aves del mundo (del Hoyo et al.: Handbook of the birds of the world. Volume 6: mousebirds to hornbills). Hornero 17:54.
Mazar Barnett, J. 2003aAves de Argentina y Uruguay (Narosky & Yzurieta: Guía para la identificación de las aves de Argentina y Uruguay (Edición de Ore). Hornero 18:12830.
Mazar Barnett, J. 2003bOn the migratory status of the Patagonian population of the Striped Woodpecker Picoides lignarius. Bulletin of the British Ornithologists' Club 123:130135.
Mazar Barnett, J. 2003cBook review (Chebez et al. 1998: Las aves de los parques nacionales de la Argentina).Cotinga 19:88.
Mazar Barnett, J. 2003dBook review (Bencke 2001: Lista de referência das aves do Rio Grande do Sul).Cotinga 19:8889.
Mazar Barnett, J., J. C. Carlos, and S. A. Roda. 2003A new site for the Alagoas endemics. Cotinga 20:13.
Mazar Barnett, J., J. C. Carlos, and S. A. Roda. 2005Renewed hope for the threatened avian endemics of northeastern Brazil. Biodiversity and Conservation 14:22652274CrossRef
Mazar Barnett, J., R. Clark, A. Bodrati, G. Bodrati, G. Pugnali, and M. Della Seta. 1998aNatural history notes on some little known birds in north-west Argentina. Cotinga 9:6475.
Mazar Barnett, J., M. Della Seta, S. Imberti, and G. Pugnali. 1998bNotes on the rediscovery of the Austral Rail Rallus antarcticus in Santa Cruz, Argentina. Cotinga 10:96101.
Mazar Barnett, J., and J. Herrera. 1996Primer registre de Tiaris fuliginosa (Wied, 1830) para la Argentina.Hornero 14:7374.
Mazar Barnett, J., and G. M. Kirwan. 2004Notes on the nest of the Striated Softtail (Thripophaga macroura), with comments on a nest of Plain Softtail (T. fusciceps) and relationships of the genus based on nest architecture. Ornitología Neotropical 15:257263.
Mazar Barnett, J., G. M. Kirwan, M. Pearman, L. N. Naka, and J. A. Tobias. 2000Rediscovery and subsequent observations of Kaempfer's Tody-Tyrant Hemitriccus kaempferi in Santa Catarina, Brazil, with notes on conservation, life-history and plumage. Bird Conservation International 10:371379CrossRef
Mazar Barnett, J., J., Klavins, H. Del Castillo, E. Coconier, and R. Clay. 2004aNothura minor (Tinamidae) a globally threatened Cerrado species new to Paraguay. Ararajuba 12:153155.
Mazar Barnett, J., and A. Madroño Nieto. 2003Aves de la Reserva Natural del Bosque Mbaracayú: guía para la identificación de 200 especies. Fundación Moisés BertoniAsunción, Paraguay.
Mazar Barnett, J., J. Minns, G. Kirwan, and H. Remold. 2004bInformações adicionais sobre as aves dos estados do Paranã, Santa Catarina e Rio Grande do Sul. Ararajuba 12:5356.
Mazar Barnett, J., and J. R. Navas. 1998Primer registre de la Pardela Patas Rosas Puffinus creatopus en las costas argentinas. Hornero 15:4344
Mazar Barnett, J., and M. Pearman. 2001Lista comentada de las aves argentinas/Annotated checklist of Argentina. Lynx EdicionsBarcelona.
Mazar Barnett, J. and M. Pearman [ONLINE]. 2009Species lists of birds for South American countries and territories: Argentina. In J. V. Remsen, Jr., C. D. Cadena, A. Jaramillo, M. Nores, J. F. Pacheco, M. B. Robbins, T. S. Schulenberg, F. G. Stiles, D. F. Stotz, and K. J. Zimmer. A classification of the bird species of South America. American Ornithologists' Union. http://www.museum.lsu.edu/~Remsen/SACCBaseline.html>.
Mazar Barnett, J., G. Pugnali, and M. Della Seta. 1998aNotas sobre la presencia y hábitos de Uropsalis lyra en la Argentina. Cotinga 9:6163.
Mazar Barnett, J., Pugnali, G. and M. Della Seta. 1998bPrimer registro del Sai grande Oreomanes fraseri (Passeriformes: Coerebidae? Thraupidae?) en la Argentina. Hornero 15:4446.
Mazar Barnett, J., G. Pugnali, and M. Della Seta. 2001Bolivian Warbling-finch Poospiza boliviana in Argentina.Cotinga 15:68.
Naka, L. N., J. Mazar Barnett, G. M. Kirwan, J. A. Tobias, and M. A. G. Azevedo. 2000New and noteworthy bird records from Santa Catarina state, Brazil. Bulletin of the British Ornithologists' Club 120:237250.
Naka, L. N., J. Mazar Barnett, G. M. Kirwan, J. Tobias, and D. Buzzetti. 2001Records of bird species previously considered uncommon in Santa Catarina state. Cotinga 16:7173.
Naka, L. N., M. Cohn-Haft, A. Whittaker, J. Mazar Barnett, and M. F. Torres. 2007Avian biogeography of Amazonian flooded forest in the Rio Branco basin, Brazil. Wilson Journal of Ornithology 119:439449BioOne
Raposo, M. A., J. Mazar Barnett, G. M. Kirwan, and R. Parrini. 2002New data concerning the distribution, behaviour, ecology and taxonomic relationships of Minas Gerais Tyrannulet Phylloscartes roquettei. Bird Conservation International 12:241253CrossRef
Roesler, I., and J. Mazar Barnett. 2004Nuevos registros del Aguilucho Alas Anchas (Buteo platypterus) en Argentina. Hornero 19:3740.
Stouffer, P. C., K. L. Cockle, A. Aleixo, J. I. Areta, J. Mazar Barnett, A. Bodrati, C. D. Cadena, A. Di Giacomo, S. K. Herzog, P. Hosner, E. I. Johnson, L. N. Naka, and C. Sánchez. 2011No evidence for widespread bird declines in protected South American forests. Climatic Change 108:383386CrossRef
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