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4. The barn owl as an accumulator of bone remains in central western Argentina: multi-taxa neo-taphonomic approach and implications for Holocene contexts.

Author

Rubini, Facundo Sesto, Mignino, Julián, Guardia, Nicolás M, Zarco, Agustín, Teta, Pablo, Ojeda, Agustina A, and López, José Manuel

Subjects
OWLS, PALEONTOLOGICAL excavations, BIOTIC communities, BIRD pellets, HOLOCENE Epoch, BARN owl, REPTILES
Abstract

Barn owls are the most widely distributed group of owls in the world and are among the most common accumulators of small vertebrate remains at archeological and paleontological sites. Despite its importance as a bone remains accumulator and predictor of paleoenvironmental conditions due to its generalist habits, the vertebrate prey of this raptor has been scarcely studied from an ecological community perspective, especially considering the diverse range of prey it captures. Archeological, paleontological, and taphonomic studies typically reveal taxon-specific patterns, focusing primarily on small rodents. In order to overcome this problem, we studied an assemblage of vertebrate bones from barn owl pellets in the central Monte Desert of Argentina. Our analysis included the full range of prey taxa, including rodents, marsupials, birds, and reptiles, addressed from both an ecological and neo-taphonomic perspective. We compare the taxonomic and taphonomic findings with those from regional small vertebrate records obtained from various sampling types over the past 50 years to explore recent environmental changes within the Anthropocene. The assemblage of small vertebrate prey presented here comprises five species of cricetids, one species from the Caviidae family, and at least one ctenomyid rodent species. Additionally, the assemblage includes one species of didelphid marsupial, one reptile species, and at least six passeriform bird species that belong to separate families. The overall taphonomic trends are consistent with the typical barn owl pattern. However, our analysis identified a larger percentage of postcranial elements exhibiting signs of digestion compared to pellet-derived vertebrate bone assemblages previously documented. Furthermore, it is important to note that a significant proportion of avian bone fragments exhibit distinct signs of digestion. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Plausible causes of seed preferences and diet composition in seed‐eating passerines.

Author

Marone, Luis, Cueto, Víctor R., Lopez de Casenave, Javier, Zarco, Agustín, and Camín, Sergio R.

Subjects
PASSERIFORMES, COEXISTENCE of species, DESERT ecology, SEEDS, ANIMAL nutrition, FOOD habits, FOOD preferences
Abstract

We evaluated whether seed mass, handling time, handling efficiency and profitability account for (a) preferences in controlled experiments and (b) field‐diet composition of four bird species of the Monte desert, Argentina. The question of whether birds maximise their energy intake rates while feeding on seeds is assessed. We used feeding experiments with six native seed species of 0.07–0.75 mg (i.e. the seed‐size range consumed in nature), which account for 0.59–0.84 of the field diet of the four birds. We measured seed‐handling times and used published information on bird preferences and diets, and on seed chemistry, for further calculations. Bird preferences were always positively related to seed mass and also to seed profitability in the two intermediate‐sized birds. Diet composition correlated positively with seed mass and negatively with seed profitability in three species, but some birds also showed a flexible behaviour eating the most attractive seeds according to their availability. This behaviour is not genuinely opportunistic because it only focuses on a restricted fraction of the total seed species present in the field. Contrary to expectations of species coexistence due to resource partitioning, small and large birds showed similar feeding efficiencies when eating the smaller and the larger seeds. The positive association between seed mass and profitability in several studies suggests that most birds can maximise their energy reward, on average and in the long‐term, by preferring the larger seeds. A combination of potential feeding optimisation with certain flexibility in the field may characterise the feeding ecology of desert seed‐eating birds. [ABSTRACT FROM AUTHOR]

Published
2022
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13. Feeding habits of the Asiatic red-bellied squirrel Callosciurus erythraeus introduced in Argentina

Author

Zarco, Agustín, Benitez, Verónica Victoria, Fasola, Laura, Funes, G., and Guichon, Maria Laura

Subjects
purl.org/becyt/ford/1 [https], Ciencias Biológicas, INVASIVE SQUIRREL, BEHAVIOUR, FAECES ANALYSIS, Ecología, purl.org/becyt/ford/1.6 [https], CIENCIAS NATURALES Y EXACTAS, DIET
Abstract

Knowledge of food habits of invasive species is necessary to predict invasion success and potential interactions in the invaded community. The Asiatic red-bellied squirrel Callosciurus erythraeus has been introduced in Asia, Europe and South America. We studied feeding habits of red-bellied squirrels in Argentina in two sites 600 km apart where wild populations have become established. We used both faecal microhistological analysis and behavioural records to describe diet composition and feeding habits. We also analysed diet selection and the potential role of the squirrels as seed disperser. Squirrels consumed items from 35 species of exotic trees and shrubs and one native tree species; fruits and seeds represented the bulk of the diet in all seasons (faeces analysis: >44%; behavioural observations: >38%). Squirrels also consumed epiphytic and climbing plants, ferns, invertebrates, fungi, lichens, mosses and bird eggs. Diet composition varied throughout the year according to food availability. We did not find evidence of endozoochoric dispersal but we observed squirrels carrying and dropping nuts and acorns during transport. The consumption of a wide range of food items and species, the ability to modify the diet according to food availability, and the capacity to hoard food indicate that feeding habits of red-bellied squirrels favour their invasive potential. Fil: Zarco, Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentina Fil: Benitez, Verónica Victoria. Universidad Nacional de Luján. Instituto de Ecología y Desarrollo Sustentable. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Ecología y Desarrollo Sustentable; Argentina Fil: Fasola, Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Funes, G.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina Fil: Guichon, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Provincia del Neuquén. Subsecretaría de Producción y Recursos Naturales. Centro de Ecología Aplicada del Neuquén; Argentina

Published
2018

14. Chercán de las vegas, Cistothorus platensis

Author

Zarco, Agustín, Llambias, Paulo, Medrano, Fernando, Barros, Rodrigo, Norambuena, Heraldo, Matus, Ricardo, and Schmitt, Fabrice

Subjects
purl.org/becyt/ford/1 [https], Ciencias Biológicas, Historias de Vida, Nidificación, Zoología, Ornitología, Entomología, Etología, purl.org/becyt/ford/1.6 [https], Cistothorus platensis, CIENCIAS NATURALES Y EXACTAS
Abstract

Acerca de la historia de vida, y particularmente de la nidificación y biología reproductiva de Cistothorus platensis. Fil: Zarco, Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentina Fil: Llambias, Paulo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentina

Published
2018

15. Origen y evolución de los reptiles

Author

Baschetto, Fidel, Sassarolli, Juan Carlos, Zarco, Agustín, and Tracchia, Alejandro Carlos

Subjects
Evolución, Reptiles, purl.org/becyt/ford/4.3 [https], Quelonios, purl.org/becyt/ford/4 [https]
Abstract

Las hipótesis acerca del origen de los reptiles (y de los vertebrados en general) han sufrido grandes variaciones en los últimos años debido a la mejora en las técnicas moleculares que pueden establecer relaciones de parentesco de mayor confianza, del hallazgo de nuevos fósiles, y del mejoramiento de las técnicas cladísticas. A pesar deello, el registro fósil sigue siendo incompleto por lo que el origen exacto de algunosgrupos se encuentra en discusión.En este capítulo se discuten las hipótesis evolutivas actuales de este grupo, con énfasis en los quelonios. Fil: Baschetto, Fidel. No especifíca; Fil: Sassarolli, Juan Carlos. No especifíca; Fil: Zarco, Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentina

Published
2018

18. First record of Dot-winged Crake, Porzana spiloptera, Durnford, 1877 (Rallidae) for the central Andes in Argentina

Author

Zarco, Agustín, Cuervo, Pablo F., and Llambías, Paulo E.

Subjects
parasitic diseases, Argentina, food and beverages, range extension, Andes, Rare rail, wetland
Abstract

Porzana spiloptera, the Dot-wing Crake, has a patchy distribution in southern South America and has previously been considered as inhabiting exclusively lowland wetlands. Here we present evidence of a new population inhabiting a high-elevation site in the Central Andes of Argentina. This record suggests not only a broader distribution but greater tolerance of the species to higher elevation and lower temperatures than has previously been assumed.

Published
2017

19. Building multiple nests is associated with reduced breeding performance in a south temperate population of Grass Wrens Cistothorus platensis platensis.

Author

Llambías, Paulo Emilio, Jefferies, María Milagros, Cáceres Apaza, Daniel Pascual, Garrido, Paula Sabrina, Zarco, Agustín, Arrieta, Ramiro Santiago, and Bender, José Benjamin

Subjects
NEST building, ANIMAL clutches, NEST predation, BROOD parasitism, NESTS, GRASSES
Abstract

Grass Wrens Cistothorus platensis build two types of non‐breeding nest structures: platforms and dummy nests. Platforms are rudimentary accumulations of grasses concealed between vegetation. Dummy and breeding nests are dome‐shaped with a similar structural layer. We used a nest‐removal experiment and observational data to evaluate several hypotheses regarding the adaptive significance of building multiple nests in a south temperate population of Grass Wrens. Building non‐breeding nests was not a strategy of males to attract additional females, as most of these nests were built after pair formation and both sexes collaborated during building. Building non‐breeding nests was not a post‐pairing display as the presence of multiple nests did not increase female investment in the breeding attempt: clutch size and female provisioning to nestlings did not differ between experimental and control territories where no non‐breeding nests were removed. Similarly, in non‐manipulated territories, clutch size and female provisioning were not correlated with the number of non‐breeding nests or with males' nest‐building effort. Contrary to this hypothesis, the number of non‐breeding nests was associated with delayed clutch initiation and reduced hatching success. The presence of non‐breeding nests did not reduce nest predation and brood parasitism, which did not differ between experimental and control territories. We did not detect differences in concealment between non‐breeding and breeding nests, suggesting that non‐breeding nests were not the result of abandonment before egg‐laying to reduce subsequent nest predation. Dummy nests did not provide shelter; they were not used frequently for roosting over the breeding season and were not maintained during the non‐breeding season. We suggest that building non‐breeding nests may be an attempt by males to manipulate the decision of females to breed with a mate they might otherwise reject or to start reproduction earlier than optimal for the females. [ABSTRACT FROM AUTHOR]

Published
2020
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21. Vegetation structure and food influence in the space use by granivorous birds in the central Monte Desert

Author

Zarco, Agustín, Cueto, Víctor R., and López de Casenave, Javier N.

Abstract

Dependiendo de las diferentes restricciones dietarias y de los recursos queutilizan las aves para sus actividades sus comportamientos pueden verse afectados dediferente manera ante cambios en la abundancia del alimento o en la estructura delhábitat. En este trabajo se analizó cómo estos dos factores modifican en el desierto del Monte central el uso del espacio por parte de tres aves granívoras: Zonotrichia capensis,un granívoro generalista, Saltatricula multicolor, un graminívoro, y Poospiza torquata,graminívoro en la temporada no reproductiva. Durante la etapa reproductiva, a escala dehábitat, se encontró que S. multicolor ante la disminución de la abundancia de alimentoy de la cobertura arbórea aumentó la superficie defendida, mientras que Z. capensis nomodificó su territorio. A escala de microhábitat, la selección de perchas para cantar nodifirió para ninguna de las especies en ambientes con diferente estructura de lavegetación. Durante la temporada no reproductiva se observó que los patrones demovimiento de individuos juveniles y la dispersión natal difiere entre las avesgranívoras: mientras S. multicolor posee dispersión natal retrasada, Z. capensis y P.torquata abandonan la zona de cría al finalizar el período de dependencia alimenticia. La abundancia de alimento afectó también la estructura de las bandadas invernales, yaque una disminución del alimento provocó un decrecimiento en el tamaño de lasbandadas y en la proporción de aves granívoras que las forman. Las evidencias sugierenque en la porción central del desierto del Monte el efecto que ejercen el alimento y laestructura del hábitat en el uso del espacio por las aves granívoras es especie-específicoy depende de las características de éstas. Birds behaviour could be differently influenced by changes in food abundanceand habitat structure, depending on dietary restrictions and resources use. In these studywas analyzed how those factors modified the use of space of three seed-eating birds inthe central Monte desert during the breeding and non- breeding seasons: Zonotrichiacapensis, a granivorous generalist, Saltatricula multicolor, a grass specialist, and Poospiza torquata, a grass specialist in the non-breeding season. During the breedingseason and considering at an habitat scale, S. multicolor increased their territorial areadue to the lack of food abundance and tree cover, while Z. capensis did not. At amicrohabitat scale, there was no difference in song perch selection for any speciesbesides the vegetation structure differences between environments. On the other hand,during the non-breeding season the movement patterns of young individuals and nataldispersal differed among species: S. multicolor shows a delayed natal dispersal and Z.capensis and P. torquata leaved their natal area after the nutritional dependence period. The structure of wintering flocks was affected by food abundance: size and seed-eatingbirds proportion in the flocks dimished with food decrease. This study results suggestthat in the central Monte desert, food and habitat structure affect the space use, beingspecies-specific and depending on bird characteristics. Fil: Zarco, Agustín. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.

Published
2016

22. Predation by invasive rainbow trout on the critically endangered Pehuenche spiny‐chest frog.

Author

Zarco, Agustín, Corbalán, Valeria, and Debandi, Guillermo

Subjects
*FROGS, *PREDATION, *INTRODUCED species, *RAINBOW trout, *RARE birds
Abstract

The Pehuenche spiny‐chest frog Alsodes pehuenche is an endemic species from the Andes of Argentina and Chile and is considered to be critically endangered. Its population has been declining over the past 10 years, principally as a consequence of the paving of a road that crosses the streams the frog inhabits. Until recently, exotic fish species had not been recorded in these streams. This study documents the presence of rainbow trout (Oncorhynchus mikyss) in one of these streams and predation on the endangered frog species. [ABSTRACT FROM AUTHOR]

Published
2021
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25. Life cycle of Psilopygida crispula (Dognin, 1905) (Lepidoptera: Saturniidae, Ceratocampinae)

Author

Zarco, Agustín, Zapata, Adriana Inés, and Beccacece, Hernán Mario

Subjects
Ciencias Biológicas, purl.org/becyt/ford/1 [https], ARGENTINA, Otras Ciencias Biológicas, ESTADOS INMADUROS, purl.org/becyt/ford/1.6 [https], CIENCIAS NATURALES Y EXACTAS, LEPIDOPTERA, SATURNIIDAE, CERATOCAMPINAE
Abstract

Se describen los estados inmaduros, tiempos de desarrollo y mortalidad de Psilopygida crispula (Dognin, 1905). El estudio fue realizado a partir de huevos de hembras capturadas en el Bosque Serrano, Córdoba, Argentina. Además, se reporta a Acacia caven, A. atramentaria y A. praecox (Fabaceae) como posibles plantas nutricias de las larvas. The immature stages, development time and mortality of Psilopygida crispula (Dognin, 1905) are described. The study was made under laboratory conditions from eggs laid by females collected in the Bosque Serrano, Córdoba, Argentina. Furthemore, Acacia caven, A. atramentaria and A. praecox (Fabaceae) are reported as potential larval foodplants. Fil: Zarco, Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentina Fil: Zapata, Adriana Inés. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Cátedra de Diversidad Animal I; Argentina Fil: Beccacece, Hernán Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones Biológicas y Tecnológicas. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Investigaciones Biológicas y Tecnológicas; Argentina

Published
2015

26. Dieta de Phytotoma rutila (Passeriformes: Cotingidae) en el desierto del Monte central, Argentina

Author

RÍOS, JUAN MANUEL, ZARCO, AGUSTÍN, MOSCA-TORRES, MARÍA E., and SABAT, PABLO

Abstract

Se determinó la composición botánica de la dieta del Cortarramas Phytotoma rutila en el desierto del Monte central, Argentina, mediante análisis microhistológico de las heces. En ambos sexos, la dieta estuvo compuesta por una importante proporción de frutos (26.8%) y hojas (35.6%) del arbusto Lycium tenuispinosum (Solanaceae) y hojas del árbol Prosopis flexuosa (Fabaceae) (26.8%). P. rutila es una ave predominantemente folívora con un alto consumo de frutos durante el verano, cuando estos ítems son abundantes, lo que refleja su comportamiento oportunista. Botanical composition of the diet of White-tipped Plantcutter Phytotoma rutila in the central Monte desert from Argentina, was determined by microhistological analysis of excreta. In both sexes, the diet was composed by a high proportion of fruits (26.8%) and leaves (35.6%) from the shrub Lycium tenuispinosum (Solanaceae) and leaves from the tree Prosopis flexuosa (Fabaceae) (26.8%). P. rutila is a predominantly folivorous bird with a high consumption of fruit during summer, when these items are abundant, which shows an opportunistic behavior.

Published
2014

28. Hawkmoths richness (Lepidoptera: Sphingidae) of the serrano forest in 'La Quebrada Park' natural hydrologic reserve and its surroundings (Córdoba, Argentina)

Author

Beccacece, Hernán Mario, Zapata, Adriana Inés, Villafañe, Noelia A., Zarco, Agustín, Cherini, María de la Paz, and Drewniak, María Eugenia

Subjects
purl.org/becyt/ford/1 [https], Ciencias Biológicas, ARGENTINA, Otras Ciencias Biológicas, CÓRDOBA, LISTA DE ESPECIES, MARIPOSAS NOCTURNAS, purl.org/becyt/ford/1.6 [https], CIENCIAS NATURALES Y EXACTAS, BOSQUE SERRANO
Abstract

El Bosque Serrano es, en la provincia de Córdoba, un área de gran interés en términos de biodiversidad. Los esfíngidos son lepidópteros de tamaño generalmente grande, nectarívoros, de hábitos mayoritariamente nocturnos y que participan, entre otras funciones ecológicas, en la polinización. La distribución y riqueza de estos organismos son aspectos poco estudiados en esta provincia. El objetivo de este trabajo fue conocer la riqueza de esfíngidos del Bosque Serrano en la Reserva Hídrica Natural “Parque La Quebrada” y sus alrededores. Se muestreó un área ubicada en las Sierras Chicas (provincia de Córdoba, Argentina) utilizando trampas de luz, entre diciembre y abril de 2006-2007 y 2007-2008. Se registraron un total de 12 especies pertenecientes a las subfamilias Macroglossinae y Sphinginae. Ocho de las especies constituyen nuevos registros para el área de estudio. The Serrano Forest of Cordoba is an important area in terms of biodiversity. The sphingid adults are large, mostly nocturnal moths with nectar-feeding habits. The hawkmoths are involved, among other roles, in pollination. The richness and distribution of the species are poorly known in this province. The aim of this study was to determine the hawkmoths richness of the Serrano Forest in “La Quebrada Park” natural hydrologic reserve and its surroundings. We sampled an area in the Sierras Chicas (province of Córdoba, Argentina) using light traps from December to April 2006-2007 and 2007-2008. A total of 12 species, belonging to the subfamilies Macroglossinae and Sphinginae, were found. Eight species are new records for the study area. Fil: Beccacece, Hernán Mario. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Centro de Investigaciones Entomológicas de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones Biológicas y Tecnológicas. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Investigaciones Biológicas y Tecnológicas; Argentina Fil: Zapata, Adriana Inés. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Cátedra de Diversidad Animal I; Argentina Fil: Villafañe, Noelia A.. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Cátedra de Diversidad Animal I; Argentina Fil: Zarco, Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentina. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Cátedra de Diversidad Animal I; Argentina Fil: Cherini, María de la Paz. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Cátedra de Diversidad Animal I; Argentina Fil: Drewniak, María Eugenia. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Cátedra de Diversidad Animal I; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina

Published
2011

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