Eduardo F. Schaefer

National Scientific and Technical Research Council | conicet · IIGHI Instituto de Investigaciones Geohistóricas, Resistencia - Chaco - Argentina

Manual de técnicas y protocolos para el relevamiento y estudio de anfibios de Argentina. Capítulo: Estudios tróficos

In the Argentinean Gran Chaco, numerous investigations have dealt with the diversity of vertebrates , including amphibians and reptiles. The parasitofauna of these organisms, has been more studied in some groups such as amphibians; however, from a biogeographic perspective, most of these studies were carried out in the Humid Chaco. The goal of this...

The present study describes the helminth community collected from juveniles of Dermatonotus muelleri (Anura: Microhylidae) from the Chaco Seco Ecoregion. Helminths were found in 80.0% of specimens examined (n = 16). The helminth community of this microhylid presented very low species richness; a total of 1,339 specimens belonging four helminth spec...

This is the first record of the nematode parasite Kalicephalus subulatus (Strongylida, Diaphanoce - phalidae) in Wagler’s snakes, Xenodon merremi (Squamata, Colubridae), collected in Corrientes, Argentina. The species was observed using light and scanning electron microscope (SEM) and compared to previous studies from Tropical America. As for the m...

Here we describe a new species of sarcophagid fly reared from larvae found feeding on three species of leptodactylid frogs collected in subtropical Corrientes Province in northeastern Argentina. Our species description is based on adult male and female external morphology and genitalia. Adult males and females of the new species were associated wit...

We describe the vocal repertoire of Melanophryniscus cupreuscapularis, a bufonid toad of the Melanophryniscus stelzneri species group, which has been recently listed as “Vulnerable” by the Asociación Herpetológica Argentina. Recordings were obtained in “Paraje El Perichón,” a relict of Schinopsis balansae “quebracho” forest near Corrientes City, Ar...

The ability of an organism to produce different phenotypes under different environmental conditions is a common adaptation in nature. Biotic factors like competition, community structure and predation can influence the survival and time to metamorphosis in amphibians. However, abiotic factors such as the hydroperiod and light intensity can be as im...

A más de una década de la primera Lista Roja de herpetofauna propuesta por la Asociación Herpetológica Argentina (Lavilla et al., 2000), se recategorizaron los anfibios a partir de nueva información taxonómica, biogeográfica, bio-ecológica y de modificaciones metodológicas respecto a la evaluación anterior. Mediante la participación de 35 especiali...

Entre el 4 de marzo y el 25 de abril de 2011, en 6 sistemas de trampas instalados en la Provinciade Formosa, Ciudad de Las Lomitas, Departamento Patiño, Ruta Nacional N° 81, Establecimiento Sumayen 2000 (24°39'49,4" S; 60°38'29,9" O; 137 m.s.n.m.; datum WGS84), fueron colectados 32 microhílidos con vientre gris manchado de blanco, y características...

Revisamos el método utilizado para determinar especies amenazadas en la Argentina, con los objetivos de: (1) que pueda ser empleado consistentemente por diferentes personas reduciendo la subjetividad, (2) brindar una guía sobre cómo evaluar los factores que conducen al riesgo de extinción, (3) proporcionar a los usuarios de listas rojas una mejor c...

We studied the trophic ecology of Dendrobates auratus and Oophaga pumilio in La Selva Biological Station, Costa Rica. At this site, both dendrobatids are sympatric due to the introduction and naturalization of D. auratus in the last 24 years. Diets of both dendrobatids were recorded by the analysed stomach flushing technique. Microhabitats uses wer...

The present study describes the reproductive biology of Argenteohyla siemersi pederseni in a modified “quebracho” forest of Schinopsis balansae in northeastern Argentina. Observations were made between January 2007 and March 2009 at El Perichón, Corrientes Province, Argentina. Argenteohyla s. pederseni bred once per year over a 3-day period in a se...

Abstract Physalaemus albonotatus, as other species in the family Leiuperidae, deposits its eggs in foam nests. The main goals of this study were: 1) to observe and analyze the timing of reproduction in relationship to environmental variables (rainfall, atmospheric pressure, relative humidity, temperature), and 2) to describe the behaviour of both s...

Natale, G.S., Alcalde, L., Herrera, R., Cajade, R., Schaefer, E.F., Marangoni, F. and Trudeau, V.L. 2011. Underwater acoustic communication in the macrophagic carnivorous larvae of Ceratophrys ornata (Anura: Ceratophryidae). —Acta Zoologica (Stockholm) 92: 46–53. We provide the first evidence for sound production by anuran larvae. In this study, we...

In amphibians from tropical or subtropical regions well-expressed growth marks in bone could be expected because of the existence of strong dry/wet seasons, but little evidence is available. Additionally, temporal patterns of growth-mark formation may be a function of genetic and environmental factors. We used skeletochronology and a laboratory exp...

The niche overlap and resource partitioning were analyzed for five sympatric bufonids from Northeastern Argentina: Rhinella schneideri, R. bergi, R. fernandezae, R. granulosa, and Melanophryniscus cupreuscapularis. The primary objectives were to analyze the diet and pattern of coexistence relative to the microhabitats among species. The bufonids, w...

Desde febrero de 2002 a diciembre de 2004, se analizó la fauna de helmintos parásitos y las características reproductivas de Scinax nasicus en un área cercana a la ciudad de Corrientes, Argentina. La fauna de parásitos helmintos estuvo conformada por 15 especies de helmintos (larvas y adultos) incluyendo trematodes (73%), nematodes (20%) y acantocé...

The anuran biodiversity and richness of a frog community inhabiting rice fields in northeastern Argentina was surveyed and analyzed. The samples were taken between October 2001 and June 2003. Twenty six species of amphibians were identified in five micmhabitats: rice fields per se, ditches and paths, natural vegetation, aquatic vegetation and gulli...

This communication provides notes on 2 species of toads, Chaunus schneideri and Chaunus granulosus, infested with ixodid ticks, Amblyomma rotundatum, from the provinces of Corrientes and Formosa in northern Argentina. Chaunus schneideri is a new amphibian host record for A. rotundatum, a species previously reported to parasitize other anurans and a...

We studied the trophic and reproductive ecology and document the helminth fauna of the Cei's white-lipped frog, Leptodactylus chaquensis, from north-eastern Argentina. This frog is a generalist predator, using an intermediate strategy between active foraging and sit and wait predation. The diet consisted of 17 types of prey and was dominated numeri...

Ecological aspects of diet, reproduction, and parasitism of Pseudopaludicola bo- liviana (Anura, Leptodactylidae) from Corrientes, Argentina. The main objectives of this paper were to update the distribution range of Pseudopaludicola boliviana in Argentina, to determine its diet composition and the feeding patterns, to analyze some reproductive var...

The main objectives of this paper were to update the distribution range of Pseudopaludicola boliviana in Argentina, to determine its diet composition and the feeding patterns, to analyze some reproductive variables as mature ova count and diameter in relation to female snoutvent length, to describe the advertisement call for Argentinean populations...

We describe the tadpole of Physalaemus albonotatus (Anura, Leptodactylidae), from specimens collected from northeastern Argentina. The distinguishing characteristics (Stage 36) are (1) labial tooth row formula: 2(2)/3(1); (2) rostral gap about 2.5 times greater than mental gap; (3) body length of 10.00 mm and total length of 24.20 mm; and (4) body...

R E S U M E N. - Durante la época de reproducción de Physalaemus albonotatus se observaron cantando agregaciones numerosas de machos de esta especie. En algunas oportunidades se presenciaron contactos agresivos entre éstos, los cuales eran precedidos por un canto diferente al nupcial típico. En este trabajo se describe el canto de encuentro de P. a...

During the breeding time period it is frequent to observe males of Physalaemus albonotatus aggregated for calling. In several opportunities was observed aggressive contact between males preceeded by a different can than nuptial vocalization. In this paper we describe the encounter can of P. albonotatus from a population from Corrientes province, Ar...

En el presente trabajo se recalifica el estado de conservación de la fauna de suarios y anfisbénidos de las provincias de Corrientes, Chaco y Formosa y la de anfibios de la provincia de Corrientes, siguiendo la metodología de Reca, Úbeda y Grigera (1994) que actualmente está en vigencia. La misma Utiliza un índice ordenador-orientador (SUMIN) el cu...