Movement patterns of three species of sparrow in the central Monte desert, Argentina: differences between and within species

Sagario, M. Cecilia; Cueto, Víctor R.; Casenave, Javier Lopez de

doi:10.1071/mu13098

Cited by 11 publications

(5 citation statements)

References 52 publications

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“…ing the same months the partial migrant Z. capensis australis was also very abundant. Zonotrichia capensis choraules is resident in other localities of northern Patagonia (Keve & Kovács 1971), and both subspecies form flocks of hundreds of individuals during fall-winter in northern Patagonia (Keve & Kovács 1971) and in the region of the Monte desert (Sagario et al 2014, Zarco & Cueto 2017. During the second summer of our study (mainly January and February 2017), total abundance increased notably.…”

Section: Discussionmentioning

confidence: 61%

“…A similar pattern was recorded by Keve & Kovács (1971) for this subspecies in localities near El Bolsón and Bariloche (Argentina). Zonotrichica capensis australis breeds mainly in southern Argentina and Chile (King 1974, Piloni 2002, Ortiz & Capllonch 2011, and moves to northern latitudes in winter (Ortiz & Capllonch 2011, Sagario et al 2014. During May, we had a high capture rate of this subspecies, but during the following fall and winter months its capture rate was low.…”

Section: Discussionmentioning

confidence: 85%

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Seasonal Changes in Bird Assemblages of a Forest-Steppe Ecotone in North Patagonia

Cueto

Gorosito

2018

Ornitol. Neotrop.

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∙ We studied seasonal variation in a community of birds inhabiting a forest–steppe ecotone of north Patagonia. We analyzed changes in species richness, species composition and total abundance, and, at the species level, we evaluated differences in breeding and molting seasonality. The bird assemblage showed a low seasonal variation in richness and total abundance, but a great change in species composition between spring–summer and fall–winter. The change in species composition did not lead to changes in richness and total abundance, due to the presence of abundant species that visit the area in different seasons. At the species level, resident birds and short distance migrants tended to begin breeding earlier than long distance migrants, and those bird species began to molt body and flight feathers after breeding. Therefore, we found a low overlap between these two energetically demanding activities. Elaenia albiceps, the only long-distance migrant species, did not molt body and flight feathers in our study area. Our results highlight the importance of bird movements in response to seasonal variations in the availability of resources, which promote migration or local displacements of birds. Resumen ∙ Cambios estacionales en los ensambles de aves en un ecotono bosque–estepa del norte de Patagonia Estudiamos las variaciones estacionales en una comunidad de aves que habitan el ecotono bosque-estepa del norte de Patagonia. Analizamos los cambios en la riqueza de especies, la composición de especies y la abundancia total, y a nivel de las especies, evaluamos las diferencias en la estacionalidad reproductiva y de muda. El ensamble de aves mostró pocas variaciones estacionales en la riqueza y abundancia total, pero un notable cambio en la composición de especies entre la primavera–verano y el otoño–invierno. El cambio en la composición de especies no promovió variaciones estacionales en la riqueza y la abundancia total, debido a la presencia de especies abundantes que visitan el área en las diferentes estaciones. A nivel de las especies, las aves residentes y migrantes de corta distancia tendieron a comenzar la reproducción antes que las migrantes de larga distancia, y aquellas especies de aves comenzaron la muda de plumas del cuerpo y del ala al finalizar la reproducción. Por lo cual encontramos una baja superposición de estas dos demandantes actividades. Elaenia albiceps, la única especie migradora de larga distancia, no presentó muda corporal o del plumaje de vuelo en nuestra área de estudio. Nuestros resultados remarcan la importancia del movimiento de las aves en respuesta a las variaciones en la disponibilidad de recursos, que promueven la migración o el desplazamiento local de las aves.

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Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 85%

Seasonal Changes in Bird Assemblages of a Forest-Steppe Ecotone in North Patagonia

Cueto

Gorosito

2018

Ornitol. Neotrop.

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“…The guild of small seed-eating birds that forage mainly from the ground is formed by 4–5 species: Zonotrichia capensis , Saltatricula multicolor , Diuca diuca, Phrygilus carbonarius , and Poospiza ornata only in spring–summer [30, 111, 112]. The guild changes in abundance and composition along the year: the abundant southern subspecies Zonotrichia capensis australis is only present during autumn and winter (other subspecies are resident) [113] and Poospiza ornata arrives for the breeding season [114]. We expect these species to remove experimental seeds from the ground according to their mean proportional abundances in this habitat [95]: autumn–winter: 60.4% Z. capensis , 23.9% P. carbonarius , 8.1% D. diuca , 7.6% S. multicolor ; spring–summer: 49.4% P. ornata , 18.7% S. multicolor , 15.5% D. diuca , 11.3% P. carbonarius , and 5.2% Z. capensis .…”

Section: Methodsmentioning

confidence: 99%

Are all patches worth exploring? Foraging desert birds do not rely on environmental indicators of seed abundance at small scales

2019

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Background Consumers should show strong spatial preferences when foraging in environments where food availability is highly heterogeneous and predictable. Postdispersal granivores face this scenario in most arid areas, where soil seed bank abundance and composition associates persistently with vegetation structure at small scales (decimetres to metres). Those environmental features should be exploited as useful pre-harvest information, at least to avoid patches predicted to be poor. However, we did not find the expected spatial association in the algarrobal of the central Monte desert by observing foraging seed-eating birds, a field technique influenced by how much they exploit visited patches. In this work we tested if the first stage of foraging by granivorous birds (patch visit, encounter or exploration) is positively associated with environmental indicators of patch quality by recording the removal of single seeds from 300 scattered experimental devices during seasonal trials. Spatial selectivity was analysed by comparing the structural characteristics of used vs. available microhabitats, and evaluated against bottom-up and top-down hypotheses based on our previous knowledge on local seed bank abundance, composition and dynamics. Their foraging activity was also explored for spatial autocorrelation and environmental correlates at bigger scales. Results Postdispersal granivorous birds were less selective in their use of foraging space than expected if microhabitat appearance were providing them relevant information to guide their search for profitable foraging patches. No microhabitat type, as defined by their vegetation structure and soil cover, remained safe from bird exploration. Analyses at bigger temporal and spatial scales proved more important to describe heterogeneity in seed removal. Conclusions Closeness to tall trees, probably related to bird territoriality and reproduction or to their perception of predation risk, seemed to determine a first level of habitat selection, constraining explorable space. Then, microhabitat openness (rather than seed abundance) exerted some positive influence on which patches were more frequently visited among those accessible. Selective patterns by birds at small scales were closer to our predictions of a top-down spatial effect, with seed consumption creating or strengthening (and not responding to) the spatial pattern and dynamics of the seed bank. Electronic supplementary material The online version of this article (10.1186/s12898-019-0242-z) contains supplementary material, which is available to authorized users.

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“…La relación entre los agroecosistemas templados y la dinámica de las poblaciones de aves granívoras está ampliamente analizada en el hemisferio norte (Díaz & Tellería 1994, Robinson & Sutherland 1999, Moorcroft et al 2002, Hancock & Wilson 2003, Robinson et al 2004. En Argentina, el estudio de aves granívoras ha sido abordado en profundidad en algunas eco-regiones como El Espinal y El Monte (Marone et al 1997, Lopez de Casenave et al 1998, Marone et al 2000, Blendinger & Ojeda 2001, Gonnet 2001, Cueto et al 2013, Sagario et al 2014, mientras que en los agroecosistemas de la Región Pampeana han recibido una menor atención (Isacch et al 2003, Leveau & Leveau 2011, Apellaniz et al 2012. Sin embargo, en particular algunas especies de aves granívoras han sido foco de estudios en los agroecosistemas del centro de Argentina, principalmente en la Región del Espinal, como consecuencia de los conflictos que generan dichas especies sobre las actividades agropecuarias (Murton et al 1974, Bruggers et al 1998, Canavelli et al 2014.…”

Section: Objetivo De La Tesisunclassified

Aves granívoras en agroecosistemas templados: su relación con el uso de lotes agrícolas y ganaderos y las características del entorno

Zufiaurre¹

2019

El Hornero

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Movement patterns of three species of sparrow in the central Monte desert, Argentina: differences between and within species

Cited by 11 publications

References 52 publications

Seasonal Changes in Bird Assemblages of a Forest-Steppe Ecotone in North Patagonia

Seasonal Changes in Bird Assemblages of a Forest-Steppe Ecotone in North Patagonia

Are all patches worth exploring? Foraging desert birds do not rely on environmental indicators of seed abundance at small scales

Aves granívoras en agroecosistemas templados: su relación con el uso de lotes agrícolas y ganaderos y las características del entorno

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