La Plata, Argentina


La Plata, Argentina
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Barn Swallow Hirundo rustica was first recorded nesting in Argentina in the early 1980s, when just a few pairs were found in central-east Buenos Aires province. Since then, the species appears to have spread. Here we present new records from a locality in central Buenos Aires province, providing further evidence of the extension of its breeding range, as well as data concerning parasitism by Shiny Cowbird Molothrus bonariensis on this species and nest occupancy by Grey-breasted Martins Progne chalybea.

The Golden-rumped Euphonia (Euphonia cyanocephala) comprises four subspecies: cyanocephaia, pelzeini and insignis in the west ana norm, ana aureata in tne east or South America. Our data demonstrate that some populations/individuals of aureata breed in southeastern Brazil and migrate to Misiones (Argentina) and Paraguay during the Austral autumn-winter. The precise source for those migrants remains unknown; however, the observed pattern coincides with the absence or decrease in abundance of the species at some sites in southern Brazil. Additionally, there is evidence of altitudinal movements within Brazil. There is no evidence of the presence of aureata in northwest Argentina and western Bolivia. Males from these regions have yellower bellies, blackish throat, violaceous dorsum and a more opaque light-blue color on the head than aureata, which shows a more orange belly, bluish throat and dorsum, and a more brilliant light-blue color on the head. The shared migration patterns of E. cyanocephala aureata with the Shear-tailed Gray-Tyrant (Muscipipra vetula), the Swallow-tailed Cotinga (Phibalura flavirostris), and the Black Jacobin (Florisuga fusca) uncover the existence of a small, essentially longitudinal, migratory system within the Atlantic Forest (Southern Atlantic Forest longitudinal migratory system). Another potential member of this migratory system is the Yellow-legged Thrush (Turdus flavipes), which has not been recorded during the last 50 years in Argentina, possibly due to the negative impact of deforestation in the normal development of these seasonal movements. © The Neotropical Ornithological Society.

Bodrati A.,Proyecto Selva de Pino Parana | Bodrati A.,Maimónides University | Cockle K.,Proyecto Selva de Pino Parana | Cockle K.,Maimónides University | And 6 more authors.
Cotinga | Year: 2010

Among the most diverse and threatened regions in the world is the Atlantic Forest of south-east Brazil, eastern Paraguay and the province of Misiones in Argentina. Only c.8-10% of this forest remains, nearly all of it degraded by selective logging. During 341 days in 1997-2010, we studied the avifauna of one of the few remaining patches of mature Atlantic Forest in Argentina, Cruce Caballero Provincial Park. In and around this 600-ha park we identified 312 species of birds in 53 families, 280 of them documented by tape-recordings or photographs. Of these species, 19 are globally threatened, 50 threatened in Argentina, and 73 endemic to the Atlantic Forest. The park conserves key populations of Helmeted Woodpecker Dryocopus galeatus, Araucaria Tit-Spinetail Leptasthenura setaria, Bay-ringed Tyrannulet Phylloscartes sylviolus and São Paulo Tyrannulet P. paulista. Other threatened species, including White-bearded Antshrike Biatas nigropectus, Canebrake Groundcreeper Clibanornis dendrocolaptoides and Vinaceous Amazon Amazona vinacea are more common outside the park in the mosaic of small farms and forest fragments between San Pedro and Santa Rosa. Black-fronted Piping Guan Pipile jacutinga appears to be extirpated from the park and Blue-winged Macaw Primolius maracana is apparently extirpated from Argentina. We did not record Bare-throated Bellbird Procnias nudicollis and we consider it hypothetical for the park. The mass flowering and death of takuapi bamboo Merostachys claussenii in 2004-07 generated major changes in the understorey vegetation, resulting in changes in the presence and abundance of many species. To conserve the avifauna of this small Atlantic Forest park it is of key importance to continue to improve environmental education in the surrounding farmlands. Isolation of the park can be avoided by adding neighbouring lots that still support native forest, and by providing small-holder farmers with technical and financial support to promote sustainable crops such as Araucaria angustifolia, rather than the current model of slash-and-burn tobacco farming.

The Buff-breasted Earthcreeper (Upucerthia validirostris) is endemic to western Argentina, and the Plain-breasted Earthcreeper (U. jelskii, including subspecies saturata in the north and pallida in the south), ranges from northern Peru to northwestern Argentina. They have been considered subspecies, as constituents of a superspecies, and as different species. From north to south, a morphocline, involving an increase of rustiness of the plumage and of ∼15% in bill length, 10% in wing length, and 20% in tail length, links jelskii to validirostris. The cline linking jelskii and pallida is gradual, over ∼1800 km; that between pallida and validirostris is steep, over ∼80 km. The northernmost record of validirostris is from the northern Calchaquies Valley, Salta, northwestern Argentina, a valley surrounded by mountains of up to ∼6300 m above sea level through which the lowest pass is at over 4900 m, forming a barrier between validirostris and the southernmost record of pallida to the north. The song, continuous song, duet, and call of validirostris are structurally indistinguishable from those of jelskii/pallida and from the single available recorded song of saturata. In all playback experiments, validirostris answered by approaching and vocalizing to voices of validirostris and jelskii/pallida and vice versa. Treatment of validirostris as a single species is warranted, and three subspecies can be tentatively recognized: southern validirostris (large, rufescent birds with buff bellies restricted to Argentina), central and northern jelskii (small, pale birds ranging from northwestern Argentina to central Peru), and northern saturata (small, dark, and brownish birds in northern central Peru). © The Cooper Ornithological Society 2013.

Pagano L.G.,National University of La Plata | Smith P.,Fauna Paraguay | Bodrati A.,Grupo FALCO
Hornero | Year: 2013

We present the first observations of the Veery (Catharus fuscescens) in Argentina and the second documented record for Paraguay. All observations took place between the last week of October and the first week of November 2010, at Parque Provincial Cruce Caballero (Misiones, Argentina), and Parque Nacional Teniente Enciso (Boquerón, Paraguay). Records from neighbouring countries are discussed and key characteristics for field identification are provided. The irruption of individuals in Misiones during 2010 can be attributed to an abnormal migratory movement that does not occur every year. We propose Zorzalito Colorado as the common name to be used in Argentina. © 2013, Association Ornitologica del Plata. All rights reserved.

We analyzed all known records from Argentina of the Little Blue Heron (Egretta caerulea). We report the first breeding record and 13 new localities for the species, which is now known from 30 records from 28 localities in 10 provinces. Most records come from valleys and wetlands in northern and northwestern Argentina, where the species apparently breeds regularly. Individuals reported outside this area are mostly juveniles and seems to disperse through rivers such as the Pilcomayo, Bermejo, Paraná and de la Plata. The species is expanding its distribution southward in Argentina. Although similar, juveniles of the Little Blue Heron can be distinguished from adults of the Snowy Egret (Egretta thula) by differences in colour and shape of the bill, and colour of the facial bare skin, legs, and wing feathers. © 2014 Asociación Ornitológica del Plata.

Agostini M.G.,National University of La Plata | Roesler I.,Grupo FALCO
Check List | Year: 2011

This paper presents novelty information about the distribution of Scinax granulatus in Argentina. These records were made ca. 300 km from the closest known locality. Here we propose that the species is expanding its range following the tree implantation in a former treeless habitat like the Pampas. © 2011 Check List and Authors.

Pearman M.,Aves Argentinas Asociacion Ornitologica Del Plata | Areta J.I.,Grupo FALCO | Areta J.I.,CONICET | Roesler I.,Grupo FALCO | Bodrati A.,Grupo FALCO
Ornitologia Neotropical | Year: 2010

We provide the first confirmation of the Sooty Swift (Cypseloldes fumigatus) in Argentina. The species was found breeding at four small to large waterfalls (7 to 60 m in height) in the departments of Oberá and Cainguás, Misiones province, north eastern Argentina. Within this relatively small breeding range the maximum distance between localities was Just 60 km. Eight active nests were found in the months of November through January. Nests were placed at 2.5 (n = 2), 4, 7, 25, 35 (n = 2) and 40 m from the ground, compared to all those previously documented at 2.5 m. Most were subject to spray unlike other documented nests. Our data suggests a greater plasticity in choice of nest sites. Other Argentine records of the spedes come from a different area in the north of Misiones province and mostly outside the breeding season. The complete lack of confirmed records in Argentina from mid March through early August suggests post-breeding dispersal or Austral migration. Accepted 3 July 2010. © The Neotropical Ornithological Society.

Areta J.I.,CONICET | Pearman M.,Grupo FALCO | Abalos R.,Santa Fe 164
Condor | Year: 2012

The poorly known Pseudochloris mendozae Sharpe, 1888, has usually been considered a subspecies of the widespread Greenish Yellow-Finch (Sicalis olivascens) of the Andes of Peru, bolivia, northern Chile, and northwest Argentina. In this work, we present data on morphology, vocalizations, ecology, and distribution supporting the recognition of the monte yellow-finch (Sicalis mendozae) (Sharpe 1888) as a full species. S. mendozae is 10% smaller in size (with no overlap in wing or bill measurements), and its average weight is 80% that of S. olivascens. In comparison with S. olivascens, breeding males of S. mendozae are considerably brighter, lack any olive tinge on the throat and breast, lack any dorsal mottling or streaking, and have a brighter olive rump. In fresh plumage nonbreeding males are similar to four other Sicalis species, differing subtly. female S. mendozae is closest in appearance to the allopatric Patagonian yellow-finch (S. lebruni), differing chiefly by its olive rump. The song, complex song, and calls of S. mendozae are diagnostic, though it also imitates some other birds. S. mendozae is endemic to the arid monte Desert of western Argentina from western Tucumán south to mendoza, and is parapatric with S. olivascens of high Andean steppes. Contrary to literature reports, S. mendozae is nonmigratory but may move altitudinally, descending to lower altitudes during winter. we propose the recognition of the monte Desert as a new Endemic bird Area, based on the overlap of the geographic ranges of several bird species. © The Cooper Ornithological Society 2012.

Areta J.I.,CONICET | Monteleone D.,Grupo FALCO
Ornitologia Neotropical | Year: 2011

The four currently recognized species of Metriopelia ground-doves, Black-winged Ground-Dove (M. melanoptera). Golden-spotted Ground-Dove (M. aymara). Bare-faced Ground-Dove (M. ceciliae), and Bare-eyed Ground-Dove (M. morenoi) have frequently been considered silent. So far, vocalizations have been recorded only for M. melanoptera. We provide the first evidence of vocal sound production in M. ceciliae and M. morenoi, and comment on the presence of vocalizations in M. aymara. All Metriopelia species vocalize. Their very unusual acoustic features for Neotropical doves (rapid frequency modulation, broad-band, and high emphasized frequency) can be easily linked to the barren environments they inhabit. Nesting, plumage, and vocal data is consistent with former taxonomic treatments placing M. ceciliae and M. morenoi in the genus Gymnopelia. © The Neotropical Ornithological Society.

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