321 research outputs found
Trends in closed nest entrance orientation of the Rufous Hornero Furnarius rufus along an altitudinal gradient in South America
No full textThe orientation of the nest entrances of 464 nests of the Rufous Hornero Furnarius rufus were explored in relation to vegetation cover along an altitudinal gradient in Argentina. There was no correlation between altitude and orientation for covered nests, since they were well protected from direct solar radiation, however, uncovered nests were orientated more towards the north with increasing altitude, probably to take advantage of warming solar radiation at colder, higher altitudes.Fil: Schaaf, Alejandro Alberto. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentin
El Zorzalito Boreal (Catharus ustulatus) en Córdoba, Argentina
No full textFil: Klavins, Juan. Grupo FALCO. Observación de aves; ArgentinaFil: Giraudo, Hugo. No especifica;Fil: Carmona, Carlos. No especifica;Fil: Molina, Pablo. No especifica;Fil: Toledo, Martín. No especifica;Fil: Schaaf, Alejandro Alberto. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentin
Aves: de la ciudad de San Salvador de Jujuy
No full textLa sensibilización ambiental de la población ayuda a mejorar el conocimiento y valorización de labiodiversidad urbana. Este primer fascículo de la serie Divulgando Ciencia propone informar sobrealgunas especies animales presentes en la ciudad, con el fin de crear conciencia sobre la importanciade la biodiversidad urbana, destacando la premisa: ‘conocer para valorar, valorar para conservar’.Fil: Ruggera, Román Alberto. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; ArgentinaFil: Morales, Adriana Marisel. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; ArgentinaFil: Schaaf, Alejandro Alberto. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentin
Bird nest orientation and local temperature: an analysis over three decades
No full textDifferent studies around the world have shown that the orientation of birds? nests depends on local climate variables such as temperature, wind, and rainfall (e.g. Facemire et al. 1990, Wiebe 2001, Burton 2007, Hartman and Oring, 2003, Landler et al. 2014, Schaaf et al. 2018). These local climate variables, in particular temperature, may cause variations in nest orientation between different geographical areas. For example, in temperate regions, bird species that build enclosed nests tend to orient their nests towards the sun to increase the temperature inside the nests. On the other hand, in tropical regions, the nest entrances are directed away from the sun to avoid heating (Wiebe 2001, Burton 2007, Schaaf et al. 2018). In this way, birds achieve thermal conditions more conducive to incubation and offspring growth (McGowan et al. 2004, Mainwaring et al. 2014).Fil: Schaaf, Alejandro Alberto. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; ArgentinaFil: de la Peña, Martin R.. Tres de Febrero 1870, 3080 Esperanza, Argentina.; Argentin
Effects of sun exposure and vegetation cover on Woodpecker nest orientation in subtropical forests of South America
No full textVariations in the orientation behavior of Woodpecker nests can be due to environmental factors such as latitude as well as local climate conditions. In this study, the orientations of dot-fronted Woodpecker nesting cavities (Veniliornis frontalis, Picidae) were examined at a subtropical site in Northwestern Argentina. It was evaluated whether solar radiation influences the mean orientation of cavities well covered by vegetation and cavities with less or non-external vegetal protection. Results obtained in this work provide that both covered and uncovered nests orient in a defined way towards the North and the Northwest, respectively, finding mean differences between both types of vegetation cover. These results indicate that, being exposed to the North (protected cavities) they get more solar radiation during the day to reduce the humidity of cavities’ microhabitat, due to the intense rainfall; and Northwest (unprotected cavities); to increase the temperature within the cavity due to the low night temperatures and humid climate. This study highlights the importance of studying the vegetation over the nests (protection) together with the local climatic conditions, given that they are important determinants for bird nest orientation.Fil: Schaaf, Alejandro Alberto. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentin
The effect of vegetation cover on the orientation of Monk Parakeet (Myiopsitta monachus, Psittacidae) nests in Central Argentina
No full textLa cobertura vegetal sobre los nidos de las aves puede proporcionar protección ante diferentes factores climáticos, como los vien-tos y la radiación solar recibida. En este estudio, se examinó si la cobertura vegetal influye en la orientación de la boca de entrada de los nidos de cotorra (Myiopsitta monachus, Psittacidae) en un sitio rural del centro de Argentina. Se compararon nidos con distintos tipos de cobertura vegetal: nidos con buena cobertura (protegidos) y nidos con escasa o nula cobertura (desprotegidos). Se encontraron diferencias en la orientación media de las bocas de entrada entre los distintos tipos de cobertura vegetal; por un lado, los nidos protegidos mostraron una orientación de la boca de entrada al azar, sugiriendo que la vegetación puede proporcionar protección adicional y generar así patrones de orientación aleatorios. Por otro lado, los nidos desprotegidos mostraron una orientación de entrada no aleatoria, hacia el oeste, evitando así los vientos predominantes en la región. Este estudio muestra la importancia de considerar la cobertura vegetal en los análisis de orienta-ción de los nidos.Vegetation coverage over bird nests can provide protection against different climatic factors, such as winds and the incoming solar radiation. This study examined whether vegetation coverage affects the Monk Parakeet’s (Myiopsitta monachus, Psittacidae) nest entrance orientation oin a rural site in central Argentina. Nests with different types of vegetation cover were compared: nests with abundant cover (protected) and nests with less or no vegetation (unprotected). Mean orientation differences in the entrances were found between the different types of vegetation coverage; on one hand, covered nests showed a random entrance orientation, suggesting that the vegetation cover can provide additional protection, hence generating random orientation patterns. On the other hand, the uncovered nests showed a non-random entrance orientation towards the west, thus avoiding the prevailing winds in the region. This study shows the importance of considering vegetation coverage in nest orientation analyses.Fil: Schaaf, Alejandro Alberto. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentin
Nest orientation of rufous hornero (Furnarius rufus): Vegetation, wind and solar radiation effects in Northwestern Argentina
No full textLa radiación solar, los vientos y la cobertura vegetal sobre los nidos pueden influir en las decisiones de las aves acerca de cómo construirlos; por ejemplo, en la orientación de la entrada. En este estudio se examinó la orientación de la entrada en nidos de hornero (Furnarius rufus) en un sitio desértico subtropical del norte de la Argentina. Se evaluó si la radiación solar y los vientos influyen en la orientación media de los nidos con abundante cobertura vegetal superior y en los que tienen escasa o nula cobertura vegetal superior. Los nidos con abundante cobertura vegetal superior mostraron una orientación aleatoria de la boca de entrada, lo que sugiere que la radiación solar y los vientos no influyen al momento de la construcción del nido. Los nidos con poca o nula cobertura vegetal superior presentaron una orientación de entrada no aleatoria hacia el sureste, con lo cual reducen la radiación solar directa. Además, estos nidos con escasa cobertura vegetal se orientan hacia los vientos húmedos predominantes del sur, lo que facilitaría la refrigeración dentro del nido.Este trabajo resalta la importancia de incluir la cobertura vegetal de los nidos como variable que puede influir en la orientación de los nidos.Solar radiation, winds and cover vegetation can affect nest construction decisions in birds; for example, the orientation of their entrance. In this study, the nest entrance orientation of rufous hornero (Furnarius rufus) in a subtropical desert site from Northern Argentina was examined. It was evaluated whether solar radiation and winds influence the mean orientation of nests with abundant upper vegetation cover and of those with little or no upper vegetation cover. Nests with abundant upper vegetation cover showed a randomly defined nest entrance orientation, suggesting that solar radiation and winds are not relevant in nest construction. Nests with little or no upper vegetation cover showed a non-random entrance, southeastern oriented, which would avoid direct solar radiation. Thus, nest with little or no upper vegetation cover were oriented towards prevailing southern humid winds as to increase cooling inside the nest. This work emphasizes the importance of including nest vegetation cover as a variable that may affect nest orientation.Fil: Schaaf, Alejandro Alberto. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Toco toucan documented as prey for the black‐and‐chestnut eagle in Argentina
No full textThis eagle’s nests have been documented in several countries, making it possible to study the species’ breeding-season dietary habits over a large portion of its range. For example, at nest sites in Colombia, Brazil, and Argentina, observations of prey items brought to nests by adults have been recorded. Birds, particularly cracids (Penelope spp) and domestic hens, are among the most often observed prey taxa, along with mammals weighing between 250 and 6800 g.On 27 December 2021 within the Yungas forest in Jujuy province, northwest Argentina, we observed an adult black-and-chestnut eagle bring a toco toucan (Ramphastos toco) to its nest as food for the eaglet. We believe that this is the first known record of a black-andchestnut eagle preying on a toco toucan, whose strong beak, among other characteristics, would normally serve as a predator deterrent.This sighting represents an interesting trophic interaction that, to the best of our knowledge, has not been previously reported and contributes to the understanding of the ecology of both species. Observations like this one can also help to alter people’s perceptions. Local residents, who previously may have viewed the eagle only as a potential predator of poultry, may now recognize its value in helping to control populations of species like the toco toucan, which—as a consumer of fruits—can be a source of human–wildlife conflict as well.Fil: Schaaf, Alejandro Alberto. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; ArgentinaFil: Reppucci, Juan Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; Argentin
The bright side of the moon: vocal activity of the Black-banded owl (Strix huhula huhula) in the Yungas Andean forests of Argentina
No full textIn recent years, passive acoustic monitoring (PAM) became one of main tools for natural history and behavior studies in nocturnal birds. In this study, we explored the Black-banded owl (Strix huhula huhula) vocal activity in the Yungas Andean forests from northwestern Argentina, using one autonomous recording unit from September 2017 to February 2018. We found higher vocal activity on nights with high lunar illumination (76?100 %), mainly concentrated during the early night: between 22:00 y 23:00 h; approximately 1 to 2 hours after sunset. This study shows the first acoustic phenology pattern of the black-banded owl during a year-round survey with the use of PAM in the Yungas. We highlight the importance of this type of research to gain knowledge on the vocal behavior of Neotropical nocturnal birds. Additionally we highlight the necessity of incorporating PAM, combined with occupation models, to evaluate the population status of threatened nocturnal bird species.Fil: Schaaf, Alejandro Alberto. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; ArgentinaFil: Akmentins, Mauricio Sebastián. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; ArgentinaFil: Boullhesen, Martin. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentin
Nest Orientation in Closed Nests of Passeriformes across a Latitudinal Gradient in the Southern Neotropic
No full textBirds are expected to orient their nests non-randomly in order to avoid extreme thermal conditions that are known to affect their reproductive success. Considering the hypotheses that yearly mean temperature influences entrance orientation in birds, nests at higher latitudes are expected to face the equator in order to take advantage of warmer temperatures. Here we explore the relationship between latitude and nest entrance orientation in closed nests of Passeriformes in the southern Neotropics (Furnariidae, Rhinocryptidae, Troglodytidae, Tyrannidae), using both published and original data. We found a positive and significant correlation between mean entrance orientation and latitude, and report significantly non-random nest orientation at 62% of the locations with available samples. Overall, there is a trend for nests at lower latitudes to have north-northeasterly orientations, and for nests at higher latitudes to be oriented northwest. The reasons for the observed trends remain unclear, but likely involve the availability and intensity of solar radiation and its effect upon the nest microclimate.Fil: Schaaf, Alejandro Alberto. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; ArgentinaFil: García, Cecilia Graciela. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; ArgentinaFil: Greeney, Harold F.. Yanayacu Biological Station & Center For Creative Studi; Ecuado
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