Marcela Ferreira Riveros

Instituto de Investigación Biológica del Paraguay

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...

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-...

Amphisbaena prunicolor is a worm-lizard distributed in Argentina, Brazil, and Paraguay. In Paraguay, the species was known for only one record in southern Paraguay. Here we provided a second record for the species in the country, thus extending its distribution 60 km west of the closest record located at Itapúa department, also the rediscovering of...

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...

Using as tool the ecological niche modeling technique (ENM), in this work we look for to estimate the potential geographic distribution of Phyllomedusa tetraploidea in Paraguay. We used occurrence data of the species and climatic layers extracted from the WorldClim database. The models were generated using the Maxent program. Our results identified...

RESUMEN En este trabajo presentamos una lista actualizada de los mamíferos de la Reserva Pantanal Paraguayo (RPP), situada en el Complejo de Reservas Pantanal Paraguayo, Estación Tres Gi-gantes (TG), además de los registros de mamífe-ros grandes y medianos resultado de un año de monitoreo con cámaras trampa durante el 2018. Con un esfuerzo de muest...

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...

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...

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...

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

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...