Andrea Caballero

Instituto de Biología Subtropical

We examined the effects of landscape changes in an environmental gradient of forest, a Vernicia fordii plantation, and crops on the distribution patterns of amphibians in San Rafael National Park. We conducted eight periods of fieldwork between June 2012–April 2013 and used pit fall traps with drift fences to capture amphibians. We recorded eight s...

In this study we assessed the efficacy of Visible Implant Alphanumeric (VIA) for marking adults and juveniles of the Neotropical treefrog Scinax nasicus. We evaluated the success of this technique in the identification of individuals and the prevalence of tags in the field. As a control, we marked the same individuals through toe-clipping. Of 196 m...

La evaluación del estado de conservación es una herramienta de planificación que permite tomar acciones para la preservación de estas. Paraguay sufre una acelerada pérdida de hábitats, debido a la alta tasa de deforestación por el cambio de uso de la tierra, por la que esta herramienta cumple un papel fundamental en la conservación de la biodiversi...

Wetlands are essential habitats for amphibians, but for many species, no information is available regarding how and when they make use of the different environments within the upland-wetland ecotone, nor which variables affect spatial and temporal distribution. We sought to determine the habitat preferences of two tree frog species using a capture-...

In this work, we reanalyzed specimens from Paraguay assigned to the species Rhinella icterica from the departments of Canindeyú and Amambay located in the Cerrado ecoregion. Based on the evaluation of external morphological characters, we conclude that they should be assigned to the species Rhinella cerradensis. On the other hand, we consider that...

Aggregation among individuals of the same species is a common spatial pattern in nature, and has been well studied in insects, mammals, birds, and fishes. Among vertebrates, mammals, birds, and fishes are considered the most social. Among reptiles, snakes also form aggregations for mating, defense, or communal shedding, and this behavior can be ass...

This chapter provides information on islands of forests immersed in flood-prone savannah-dominated landscapes for biodiversity conservation and productive activities. Our study area in the Paraguayan Chaco is in a region dedicated to low intensity cattle rearing, with native grasslands as forage within a mosaic of natural plant formations. The regi...

Despite its vast extension and the rich fauna that it hosts, the Paraguayan Humid Chaco is one of the least studied ecoregions in the country. In this study, we provide a list of birds and medium-sized and large mammals recorded with camera traps in Estancia Playada, a private property located south of Occidental region in the Humid Chaco ecoregion...

Species tend to be less abundant at the limits of their geographic distribution. Giant and lesser anteaters have their southernmost limits in Argentina and Paraguay, where scarce information exists regarding their ecology and conservation. We present a study carried out in the Paraguay River floodplain, in an area dedicated to cattle rearing using...

Ontogenetic colour change (OCC) is defined as the progressive and non-reversible process of changes in colouration of organisms associated with their development. Among the many vertebrate groups, amphibians are particularly impressive for their strikingly wide variety of colours, colour patterns, and signals, whose evolutionary and ecological sign...

Se establecieron 8 transectos a lo largo (1,6 km) del humedal en su transición a río. En cada transecto se tomaron muestras de calidad de agua que fueron analizadas en el laboratorio (48 muestras en 6 campañas), se identificaron las especies vegetales dentro del humedal y en el bosque ripario (16 parcelas de 100 m²) y se colocaron 173 tubos PVC par...

This work is based on a wide range of research carried out in an area of livestock production in the ecoregion of the Humid Chaco in the past five years. The studies took place in cattle ranching establishments located on the Paraguay River floodplain, dedicated to low intensity livestock production in silvopastoral systems based on native vegetati...

The evaluation of the conservation status is a planning tool that allows to take actions for the preservation of these. Paraguay suffers an accelerated loss of habitats, due to the high rate of deforestation due to the land-use change, for which this tool plays a fundamental role in the conservation of biodiversity. Law 96 of 1992, contemplates the...

Raw data of water quality samples collected in a wetland in the Humid Chaco in Paraguay. 2017-2018. Data usable with authors previous consent. Includes weather and vegetation variables. Other site variables currently under analysis. All data collected with Project PINV 15-143 Aporte multidisciplinario a la eco-hidrología de los humedales del Chaco...

Musálem, K., F. P. Barrios, A. Wehrle, R. Laino, A. Caballero-Gini, D. Bueno, M. L. Aranda, N. Musálem. Weather Station Raw Data. WMO 86181 (24.9 S - 57.3 W 67 m. 20 km East of Benjamín Aceval, President Rutherford Hayes, Paraguay). American Chaco Research Center, Manuel Gondra Foundation, Dirección Nacional de Aeronáutica Civil, Dirección de Meter...

We studied the abundance and habitat use of Crax fasciolata using camera-traps in different types of forests in the Humid Chaco of Paraguay. We obtained 114 records with a total sampling effort of 996 camera-days, most of them from one and two individuals, with a maximum of five individuals. The highest number of records was obtained in the riparia...

Animales del Chaco Húmedo – Paraguay Todas las fotos fueron tomadas dentro de la Estancia Playada entre los años 2015 y 2018 por investigadores, estudiantes y cámaras trampa donadas por IDEA WILD. El collage de fotos fue realizado por Rafaela Laino (2018) y los nombres en guaraní fueron validados por personas que viven en la zona de estudio. La Es...

Assessment of amphibians in the Humid Chaco in Paraguay in an extensive cattle ranch experimental site.

Variation in body size represents one of the crucial raw materials for evolution. However, at present, it is still being debated what is the main factor affecting body size or if the final body size is the consequence of several factors acting synergistically. To evaluate this, widespread species seem to be suitable models because the different pop...

Four species of Pseudopaludicola, Pseudopalud­ icola boliviana, P. falcipes, P. mystacalis and P. ternetzi, are usually cited for Paraguay. However, after analyzing 407 specimens assigned to this genus in herpetological collections of the country, we conclude that there are no specimens of P. falcipes in Paraguayan collections or vouchers cited in...

Elachistocleis haroi (Anura: Microhylidae) was described from the provinces of Jujuy, Salta and Formosa in Argentina and the Tarija department in Bolivia. Based on specimens housed in the Museo Nacional de Historia Natural del Paraguay and Colección Zoológica de la Facultad de Ciencias Exactas y Naturales, we extend the range of the species to the...

The presence of Tomodon ocellatus in Paraguay is confirmed and we record the first voucher specimen of Micrurus silviae for the country. Reference materials are deposited in the Colección Zoológica de la Facultad de Cien-cias Exactas y Naturales (CZ-CEN). Las serpientes del género Tomodon están res-tringidas a Sudamérica y se conocen tres es-pecies...

Resumen: Los anfibios atraviesan serios problemas de conservación en todo el mundo, y en Paraguay pocos fueron los esfuerzos por conocer su diversidad. El Departamento Central y Asunción contienen casi el 45% de las especies de anfibios registradas para el país. La Bahía de Asunción constituye un antiguo meandro del Río Paraguay, y contiene diverso...