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Javier Alejandro López

Javier Alejandro López
National Scientific and Technical Research Council (CONICET) · Instituto Nacional de Limnología (INALI: CONICET-UNL), CCT Santa Fe

Doctor en Ciencias Naturales

About

57
Publications
12,841
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Citations
Introduction
He estudiado la historia natural y el rol dentro de los humedales de los anfibios; principalmente estudios de ecología trófica de los anfibios, aunque también sobre reproducción, fenología, dinámica poblacional, genética, etología, ecología térmica y sus enfermedades emergentes. Actualmente estoy interesado en estudiar el impacto de la ganadería en los humedales sobre los anfibios y sus refugios urbanos y suburbanos.
Additional affiliations
March 2010 - present
Universidad Nacional del Litoral
Position
  • JTP
March 2010 - November 2016
Universidad Nacional del Litoral
Position
  • docente-investigador
April 2004 - present
Instituto Nacional de Limnología (INALI)
Position
  • Researcher

Publications

Publications (57)
Chapter
Full-text available
Manual de técnicas y protocolos para el relevamiento y estudio de anfibios de Argentina. Capítulo: Estudios tróficos
Article
Full-text available
The Leptodactylus latrans species group currently comprises eight medium-to large-sized frog species with a convoluted taxonomic history, particularly related to the specific limits of the L. latrans complex, and the species pair Leptodactylus chaquensis-Leptodactylus macrosternum. Their homogeneous external morphology and continental geographic di...
Article
Full-text available
The Leptodactylus latrans species group currently comprises eight medium- to large-sized frog species with a convoluted taxonomic history, particularly related to the specific limits of the L. latrans complex, and the species pair Leptodactylus chaquensis– Leptodactylus macrosternum. Their homogeneous external morphology and continental geographic...
Article
Full-text available
Little consensus exists on the role of food partitioning in the organization of tadpole assemblages. We studied trophic ecology of syntopic tadpoles through the analysis of gut contents, selectivity, and stable isotopes to assess the occurrence of food partitioning in tadpole assemblages. Tadpoles (n = 194) were collected in three wetlands and corr...
Article
Water moulds are pathogens of amphibian eggs and embryos. However, little is known about oxidant or antioxidant status of amphibians in response to stress caused by water moulds. We exposed embryo stages of two-coloured oval frogs Elachistocleis bicolor (Guérin-Méneville, 1838) to Saprolegnia -like sp. water mould in order to explore homeostatic ad...
Article
The use of preparations derived from frog skins for curative purposes antedates research history and is perpetuated in current medicine. The skins of anuran's (frogs and toads) are a rich source of compounds with a great importance in the search of antibiotics, analgesics, immunomodulators, enzymatic inhibitors and antitumoral agents applying to hu...
Article
Full-text available
Boana pulchella habita principalmente climas templados y B. punctata principalmente climas tropicales, lo que permitiría suponer la presencia de estrategias reproductivas diferentes, aún en la región en la que sus poblaciones son simpátricas. En el presente estudio se analizaron y compararon los ciclos reproductivos, parámetros reproductivos y desa...
Article
Full-text available
Natural products represent a rich source of bioactive compounds that have been historically used to obtain substances with great medicinal potential. The skin of anuran amphibians is a rich source of compounds with a wide range of biological activity. Alzheimer's disease (AD) is a complex disease associated with all kind of different pathways, maki...
Article
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In September 2005, the IUCN Species Survival Commission (SSC) held a summit for the conservation of amphibians where specialists from around the world agreed that, in addition to the need to document the declines and extinctions, we need to promote action strategies designed to respond to the global biodiversity crisis. The outcome of this summit w...
Poster
Full-text available
Los anfibios anuros, en respuesta al estrés o al ataque de depredadores, secretan diversos compuestos bioactivos a través de sus glándulas granulares, entre ellos, péptidos. El aislamiento de estos péptidos ha llevado al desarrollo de agentes terapéuticos, con diversas aplicaciones en salud humana. Actualmente, la principal estrategia para el trata...
Article
Full-text available
El público general desconoce que la República Argentina es uno de los países con mayor diversidad de anfibiosen América Latina, presentando unas 175 especies, con una gran proporción de endemismos, ciclos de vidaúnicos y adaptaciones fisiológicas y/o comportamentales a ambientes extremos (entre otras). La visión generales que la diversidad de anfib...
Article
Full-text available
Infections by water molds of the genus Saprolegnia (Oomycetes) have been associated with the death of eggs and embryos in many anuran species; however, how water molds induce physiological responses in early and susceptible developmental stages of anurans is poorly known. To assess whether or not embryos of Physalaemus albonotatus (immobile and sus...
Article
We present the first data on age structure, growth pattern, and lines of arrested growth (LAG) for Leptodactylus latrans in temperate wetlands. Based on these data, we estimate LAG periodicity, age, size at sexual maturity and longevity for this species. We also tested for differences of these parameters between sexes. The age was determined throug...
Article
Full-text available
Analizamos los patrones espacio-temporales y comportamiento de forrajeo de la rana mirmecófaga Elachistocleis bicolor. Delimitamos diez cuadrantes de 1 m2 en los que registramos el número de ranas, distancia entre individuos y comportamiento a intervalos de media hora durante nueve días. Utilizando modelos lineales mixtos generalizados evaluamos el...
Article
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Habitat destruction and alteration are among the major causes of worldwide amphibian declines. Resource limitation in altered environments can potentially affect trophic ecology of amphibians and contribute to decline. In this work, we analyzed changes in resource availability and use, and the population abundance of eight amphibian species from si...
Article
Full-text available
Albinism is a rare congenital and inherited condition characterized by an alteration in the amount and distribu-tion of dermal pigment via recessive allele expression that causes an enzyme deficiency involving the metabolism of melanin during prenatal development. Phenotypically, this condition is expressed as: (a) total albinism: absence of melani...
Article
Full-text available
Se reporta la presencia de Batrachochytrium dendrobatidis en Hypsiboas pulchellus del Parque Nacional Islas de Santa Fe
Article
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Hypsiboas punctatus (Schneider 1799) has a wide distribution in South America, throughout a latitudinal and environmental gradient (tropical/temperate), thus, supporting significantly different pressures among populations. Until now, only tropical populations’ reproductive parameters have been recorded. Then, our goal was to study reproductive para...
Article
Full-text available
Infections caused by the chytrid fungus Batrachochytrium dendrobatidis (Bd) have been highlighted as a driver of worldwide amphibian declines. In austral temperate wetlands of South America, anurans are exposed to stressors that can increase the negative effects of emerging infectious diseases. We assessed the presence of Bd infecting anurans from...
Article
Full-text available
Hypsiboas punctatus (Schneider 1799) has a wide distribution in South America, throughout a latitudinal and environmental gradient (tropical/temperate), thus, supporting significantly different pressures among populations. Until now, only tropical populations' reproductive parameters have been recorded. Then, our goal was to study reproductive para...
Article
Full-text available
In environments with thermal and pluvial seasonality such as those of the Middle Paraná River floodplain (Province of Santa Fe, Argentina), most amphibian species reproduce during the warm season and drastically diminish their activity during winter. Even though, a few species remain active during the cold season, such as Hypsiboas pulchellus that...
Article
Full-text available
Existe escasa información sobre la alimentación de las especies de anfibios activas durante la estación fría o las estrategias de utilización de reservas lipídicas como fuente de energía durante el periodo de bajas temperaturas. Por lo tanto, se analizaron las estrategias de obtención y acumulación energética durante la estación de bajas temperatur...
Article
Full-text available
We analyzed and compared the feeding of 2 populations of Physalaemus albonotatus inhabiting different ecosystems: a) an urban vacant lot, and b) a protected area of Middle Paraná River floodplain. The diet of Physalaemus albonotatus is mainly composed by ants, beetles, springtails and woodlouses, but also included several secondary preys. While com...
Article
Full-text available
Chytridiomycosis, a disease caused by the chytrid fungus Batrachochytrium dendrobatidis (B.d.), is recognized as one of the major factors of amphibian decline. Global trade of amphibians has been identified as one of the causes of B.d. spread, involving hundreds of species world wide. In this work we detected the presence of B.d. through histologic...
Article
Full-text available
Chytridiomycosis, a disease caused by the chytrid fungus Batrachochytrium dendrobatidis (B.d.), is recognized as one of the major factors of amphibian decline. Global trade of amphibians has been identified as one of the causes of B.d. spread, involving hundreds of species world wide. In this work we detected the presence of B.d. through histologic...
Article
Full-text available
The ability to develop reversible dermal extensions on the lower jaw in some South American characiform fishes has been proposed as a way to optimize the performance of aquatic surface respiration (ASR) during hypoxic conditions. These structures are formed by edema of the hypodermal tissues and can develop in a large proportion of individuals inha...
Article
Full-text available
Some South American freshwater fishes can improve their capability of aquatic surface respiration (ASR) by developing dermal lip protuberances in the lower jaw. This adaptation was thought to be limited to omnivorous or herbivorous fishes. The present work provides the first evidence that juveniles of a piscivorous characid, Salminus brasiliensis,...
Article
Full-text available
The seasonality of amphibian activity is a long studied and recognized feature but generally includes only the analysis of adult calling males. In this study, seasonal variation in abundance of a whole assemblage (adults and juveniles), coexistence patterns and phenology were analyzed in a community of 16 amphibian species inhabiting lowland river...
Article
Full-text available
Abstract –  The dynamics of fish assemblages from seven floodplain lakes of Salado River (Argentina) was monthly analysed during two contrasting hydrological seasons. Partial canonical correspondence analysis indicated that assemblage structure was predictably linked to environmental characteristics that varied along temporal and spatial scales. Sp...
Article
Full-text available
The study of the feeding ecology of amphibians is an old issue in herpetology. Notwithstanding, the lack of food resources data in many studies of amphibians feeding has lead to partial understanding of frog feeding strategies. In this study we evaluate the trophic selectivity of a red spotted green frog (Hypsiboas punctatus) population from a Midd...
Article
Full-text available
Some South American freshwater fishes can improve their capability of aquatic surface respiration (ASR) by developing dermal lip protuberances in the lower jaw. This adaptation was thought to be limited to omnivorous or herbivorous fishes. The present work provides the first evidence that juveniles of a piscivorous characid, Salminus brasiliensis,...
Article
Full-text available
Many amphibian larvae live in turbid and vegetated habitats with very limited visibility. In these habitats, the use of chemical cues for predator detection may be more reliable than visual ones. Odontophrynus americanus tadpoles inhabit floodplain ponds of the middle Paraná River, Argentina, where they frequently encounter low visibility condition...
Article
Full-text available
Elachistocleis bicolor is a poorly known South American microhylid frog. Although it has been claimed to be an ant specialist, there have been no detailed studies of ontogenetic diet change and prey selectivity in this species. We analysed the diet of 114 individuals of this frog through the post-metamorphic ontogeny. We also studied the anurans' m...
Article
Full-text available
BODY Zool6gica de ReferEncia do Campus de Corumba -CEUCH 36711, TEMPERATURE. Bufo fernanclezae is a typical inhabitant of the snake was measured and released. Bufonids are known for northeastern Argentina, and is also found in Paraguay and Uruguay. their skin toxins, although they do not seem to be an effective (Cei 1980. Amphibians of Argentina. M...
Article
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94 El 2 de febrero de 2006, durante el proceso de recolección de huevos dentro del Programa de reintroducción del Cocodrilo del Orinoco (Crocodylus intermedius) en los Llanos de Venezuela, se encontraron fortuitamente 30 huevos correspondientes a un número indeterminado de puestas de Terecay (Podocnemis unifilis). La puesta se encontró en las orill...

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