Rafael C Lajmanovich

Rafael C Lajmanovich
Universidad Nacional del Litoral | UNL

Dr. Natural Sciences

About

201
Publications
47,046
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3,613
Citations
Additional affiliations
January 2010 - present
National Scientific and Technical Research Council
Position
  • Investigador Independiente

Publications

Publications (201)
Article
Full-text available
Microplastics (MPs) are critical emerging pollutants around the world. There is a growing interest in the effects of MP ingestion, non-digestion, and toxicity on aquatic organisms. Amphibian tadpoles are the vertebrate group that has received the least attention regarding this issue. The aim of the present study was to determine the ingestion of po...
Article
Full-text available
The heart begins to form early during vertebrate development and is the first functional organ of the embryo. This study aimed to describe and compare the heart development in three Neotropical anuran species, Physalaemus albonotatus, Elachistocleis bicolor, and Scinax nasicus. Different Gosner Stages (GS) of embryos (GS 18–20) and premetamorphic (...
Article
Antiretrovirals are pharmaceuticals used in the treatment of the human immunodeficiency virus; they are contaminants of emerging concern that have received considerable attention in recent decades due to their potential negative environmental effects. Data on the bioaccumulation and possible environmental risks posed by these drugs to aquatic organ...
Poster
Full-text available
CONICET HUMEDALES DEL RÍO PARANÁ Severidad in situ: porcentaje de vegetación quemada por estratos, profundidad de quema en el suelo (cm), intensidad (altura de la llama, m), presencia de frutos-semillas en el suelo.  Registros de indicios de regeneración (signos de rebrote basales o plántulas) luego de la inspección primaria (24-168h)  método de...
Poster
Full-text available
OBJETIVOS Evaluar a corto plazo (24-196 h, CP) y mediano plazo (3-4 meses, MP) los efectos de los incendios sobre el suelo, vegetación y fauna de tetrápodos en 17 humedales distribuidos en el río Paraná Medio (Jul.-Set. 2020). Vincular datos de campo y análisis espectrales (severidad normalizada-dNBR e índice de vegetación normalizada-NDVI) con i...
Chapter
Full-text available
Manual de técnicas y protocolos para el relevamiento y estudio de anfibios de Argentina. Capítulo: Estudios tróficos
Article
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Objective The use of chlorine dioxide (ClO2) increased in the last year to prevent SARS-CoV-2 infection due to its use as disinfectant and therapeutic human treatments against viral infections. The absence of toxicological studies and sanitary regulation of this contaminant represents a serious threat to human and environmental health worldwide. Th...
Chapter
Full-text available
Manual de técnicas y protocolos para el relevamiento y estudio de anfibios de Argentina L a u r a P e r e y r a E d u a r d o E t c h e p a r e M a r c o s V a i r a E d i t o r e s 2021
Chapter
Full-text available
Manual de técnicas y protocolos para el relevamiento y estudio de anfibios de Argentina L a u r a P e r e y r a E d u a r d o E t c h e p a r e M a r c o s V a i r a E d i t o r e s 2021
Conference Paper
Full-text available
Ambiente y salud CIENCIA Y DIGNIDAD. Aunque el cúmulo de evidencias científicas es abrumador los legisladores respaldan a un modelo que enferma "No se puede hablar de salud humana sin hablar de la salud de los ecosistemas" "Es casi como un deja-vú. Porque desde hace muchos años para esta altura, los compañeros me invitan a participar de esta gran é...
Article
Full-text available
Tadpoles detect chemical signals released from predators and conspecifics, and those present in the environment, and adjust their behavioral responses. This study evaluated the swimming activity of Rhinella dorbignyi (Duméril and Bibron, 1941) tadpoles exposed to chemical signals, including cues from a predator fish Synbranchus marmoratus Bloch, 19...
Chapter
Full-text available
Impactos de la agroindustria sobre la salud ambiental de los anfibios del centro este de Argentina en el contexto del desarrollo sustentable
Article
The effects of glyphosate (GLY)-based and glufosinate ammonium (GA)-based herbicides (GBH and GABH, respectively) and polyethylene microplastic particles (PEMPs) on Scinax squalirostris tadpoles were assessed. Tadpoles were exposed to nominal concentrations of both herbicides (from 1.56 to 100 mg L⁻¹) and PEMPs (60 mg L⁻¹), either alone or in combi...
Article
Full-text available
Soil enzyme activities are often used as indicators of soil contamination. The responses of the activities of specific soil enzymes, dehydrogenase, acid phosphatase, β-glucosidase, carboxylesterase, and urease to different land uses (soybean and rice crops, and a reference site) were analyzed. Changes in activity at the start and end of each crop c...
Article
Full-text available
The effects of exposure to the herbicide Dicamba (DIC) on tadpoles of two amphibian species, Scinax nasicus and Elachistocleis bicolor, were assessed. Mortality and biochemical sublethal effects were evaluated using acetylcholinesterase (AChE), glutathione S-transferase (GST), glutathione reductase (GR), aspartate aminotransferase (AST), and alanin...
Preprint
Full-text available
The high load of agrochemicals and antibiotics coexisting in aquatic environments within agroecosystems represents a risk for wildlife. As the gut microbiota plays a key role on its host’s functioning and is sensitive to a wide variety of pollutants, its study allows evaluating organisms’ health and therefore, the ecosystem. We studied toxic effect...
Article
Full-text available
Amphibians find a suitable habitat in rice agroecosystems, but their viability is affected by the sublethal effects of agrochemicals. Animal condition, external morphology, and liver and male gonad tissue histology were examined on Lysapsus limellum and Rhinella bergi, common species that occurs in rice fields (RF) and reference sites (RS) from San...
Article
Full-text available
This study increases our understanding of how diet-driven phenotypic plasticity can help non-target aquatic invertebrates deal with chlorpyrifos (CPO) exposure. A bioassay was performed over 6 days with the freshwater shrimp Macrobrachium borellii. Experimental treatments included CPO-treated shrimps (10 μg L⁻¹) were fed with (i) a lipid-rich diet,...
Chapter
Full-text available
Específicamente en Argentina, 5 millones de hectáreas de bosques nativos fueron deforestados rasamente en 16 años (1998-2014) siendo llamativo que el 95.8 % del área desmonta�da (4.754.747 hectáreas) no incluyó la zona núcleo de produc�ción de soja (Pampa Húmeda) y fue en regiones periféricas más secas (Cacace y Morina, 20193 ). Este avance hac...
Technical Report
Full-text available
Informe mortandad masiva de peces Rio Salado (Santa Fe, Argentina), enero 2021
Article
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Analysis of the zooplanktonic community in rice fields during a crop cycle in agroecological versus conventional management This study investigated the zooplankton community in rice fields with different management practices: conventional crop (CC) and agroecological crop (AE). In both wetlands, physicochemical parameters and pesticide residues in...
Article
The presence of pesticides as well as that of several antibiotics provided at a great scale to poultry, cattle, and swine in aquatic environments within agroecosystems is a matter of growing concern. The objective of the present study was to characterize the sublethal effects of four environmental toxic compounds at two experimental pollution scena...
Article
Full-text available
Dexamethasone (DEX) is a glucocorticoid highly effective as an anti-inflammatory, immunosuppressant and decongestant drug. In the present study, a preliminary acute toxicity test was assayed in order to determinate DEX median-lethal, lowest-observed-effect and the no-observed effect concentrations (LC50, LOEC and NOEC, respectively) on the common t...
Article
Full-text available
Introduction: Recognition of the variety of ecosystem services that biodiversity performs in agroecosystems is one of the basic principles of agroecology. Because indices of functional diversity may be directly related with ecosystem services, an assessment of functional diversity can be useful for evaluating ecosystem services provided under agroe...
Conference Paper
Full-text available
Entre Ríos • Lunes 20 de julio de 2020 16 testigos. La presencia de especies, la cantidad de ejemplares y su interacción con alimentos, orientan sobre la calidad de las prácticas. Aves y ranas conversan mejor con el paisaje en la agroecología ciencia. Investigación del Conicet y la UNL sobre arrozales del litoral La fauna indígena, más cómoda y dis...
Technical Report
Entre Ríos • Lunes 20 de julio de 2020 16 testigos. La presencia de especies, la cantidad de ejemplares y su interacción con alimentos, orientan sobre la calidad de las prácticas. Aves y ranas conversan mejor con el paisaje en la agroecología ciencia. Investigación del Conicet y la UNL sobre arrozales del litoral La fauna indígena, más cómoda y dis...
Article
Full-text available
RESUMEN: Los cultivos extensivos de soja transgénica han dejado numerosos pasivos ambientales, como ser desmontes, pérdidas de suelo y biodiversidad, inundaciones, con-taminación ambiental y diversas consecuencias socio-económicas y sanitarias. En este contexto, el debate de las "distancias de aplicación" de los agroquímicos a las poblaciones human...
Conference Paper
Full-text available
profesor de ecotoxicología en la facultad de Bioquímica de la UNL. Investigador independiente de Conicet. Cuando se combinan el extractivismo con la crisis climática parecen "abrir la caja de Pandora" a la emergencia de viejas y nuevas enfermedades globales. Como el ya muy conocido dengue que llegó para quedarse, de la mano del calentamiento global...
Article
The aim of the present study was to investigate the bioaccumulation and toxicological effects of four antiretrovirals (lamivudine, stavudine, zidovudine and nevirapine) on Rhinella arenarum tadpoles, after short-term (48 h) exposure to these drugs at sublethal concentrations. The analytical procedure involved a simple extraction method followed by...
Article
Full-text available
Dimethoate (D) are among the most commonly used organophosphates insecticides in the world. To evaluate the toxicity of two D formulations were selected as test organisms tadpoles of Rhinella arenarum. This toad species has an extensive neotropical distribution and is easy to handle and acclimate to laboratory conditions. The tadpoles were exposed...
Presentation
Full-text available
Cada vez son más los médicos e investigadores que advierten sobre el peligro que los herbicidas y plaguicidas representan para el medioambiente y la salud humana. Quiénes ganan y quiénes pierden con el actual sistema agrario y cómo se podrían producir alimentos más sanos. L a soja transgénica ingresó al país en 1996, mediante una aprobación que req...
Article
Full-text available
The toxicity of glyphosate-based herbicide (GBH) and arsenite (As(III)) as individual toxicants and in mixture (50:50 v/v, GBH-As(III)) was determined in Rhinella arenarum tadpoles during acute (48 h) and chronic assays (22 days). In both types of assays, the levels of enzymatic activity [Acetylcholinesterase (AChE), Carboxylesterase (CbE), and Glu...
Article
Full-text available
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...
Article
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Las ranas nos croaron el alerta, pero el poder se hizo el sordo 23 años de extractivismo contaminante denunciado por investigadores del Conicet. Rafael Lajmanovich marcó los graves impactos de los transgénicos y agrotóxicos, y el ejemplo temprano de malformación en anfibios, que no fue escuchado. l "sapo de los charcos, sapo cancionero, embrujado d...
Article
Full-text available
Increased anthropogenic-made sounds such as traffic noises contribute to acoustic pollution, which produces deleterious effect on song-vertebrates. We compared the advertisement call of Scinax nasicus (Cope, 1862) males in natural (as a reference or control, Site A) and Sites affected by traffic noises (Site B). Call structure was recorded and it w...
Article
Full-text available
Chlorpyrifos (CPF) is a broad spectrum pesticide commonly used for insect control, has great affinity for lipids and is thus a potential for bioaccumulation in aquatic organisms. The aim of this study was to evaluate the toxicity of CPF using the common toad Rhinella arenarum via dermal uptake in plastic bucket to simulate their natural exposition...
Article
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Diversity of Anurans in Rice Fields under Organic and Conventional Management in Santa Fe Province, Argentina
Article
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The aim of this study was to evaluate the acute and chronic effects caused by exposure to the 2,4 dichlorophenoxyacetic acid (2,4-D)-based commercial herbicide Amina Zamba® on Physalaemus albonotatus tadpoles from Gosner stage 25. The lethal concentration (LC50) was determined after exposure to different concentrations of Amina Zamba® (350 to 2400...
Article
Odontoprynus americanus tadpoles were used to determine the safety concentration of pyriproxyfen (PPF) insecticide by acute and sublethal toxicity tests (nominal range tested 0.01 to 10 [± 15%] PPF mg/L). Median lethal concentration (LC50) and no, and lowest-observed-effect concentrations (NOEC and LOEC, respectively) were calculated. We also asses...
Article
Objective The ecotoxic effects of pesticide used for mosquito’s control TRISADA® (TRI) [deltamethrin (D) 1%+tetramethrin (T) 0.33%, and piperonyl butoxide (PB) 0.29%] on amphibian larvae were investigated. Methods In the laboratory, Rhinella arenarum tadpoles were exposed to nominal concentrations of 0.0000 (control; CO), 0.0003125% (C1); 0.000625...
Article
Full-text available
Amphibians´ skin produces a diverse array of antimicrobial peptides that play a crucial role as the first line of defense against microbial invasion. Despite the immense richness of wild amphibians in Argentina, current knowledge about the presence of peptides with antimicrobial properties is limited to a only few species. Here we used LC-MS-MS to...
Article
Pomacea canaliculata is a freshwater snail native to South America that has become a serious pest of rice crops. Insecticides are used to control other pests in paddy fields and P. canaliculata is collaterally exposed. Here a P. canaliculata population from a rice field (RF) where the insecticides bifenthrin and imidacloprid (IMC) were applied was...
Article
The central area of Argentina has been greatly affected mainly due to urbanization and intensive agriculture (corn, soybean and cattle). Age, longevity and growth were determined in populations of the common toad, Rhinella arenarum, from urban and agricultural sites in the central area of Argentina. Five sites in Rio Cuarto (33º05′52.95″ S - 64º26′...
Article
Emerging contaminants derive from pharmaceuticals, pesticides, disinfection by-products, home and care products, and wood preservation and industrial chemicals that contain specific drugs, metals, metal oxides and metalloids as nanoparticles (NPs) in their formulations. Although the use of silicon dioxide (SiO2) NPs in commercial products increases...
Chapter
Full-text available
The toxic or nutritionally deleterious effects resulting from the consumption of genetically modified (GM) foods are still a matter of debate worldwide. In amphibians, the environmental impact of the Bacillus thuringiensis (Bt) toxin (e.g., Cry proteins) engineered into GM Bt crops is barely known. Thus, the aim of the present study was to evaluate...
Article
Poultry litter (PL), which is usually used as organic fertilizer, is a source of nutrients, metals, veterinary pharmaceuticals and bacterial pathogens, which, through runoff, may end up in the nearest aquatic ecosystems. In this study, Leptodactylus chaquensis at different development stages (eggs, larval stages 28 and 31 here referred to as stages...
Article
Se cuantificaron y compararon los melanomacrófagos (MM) y la actividad de la enzima Glutatión S−Transferasa (GST) en hígados de ejemplares adultos de Leptodactylus chaquensis (Anura, Leptodactylidae) colectados en un cultivo de arroz (CA) (siete días posteriores a la aplicación de clorpirifos, CPF) y en un sitio de referencia (SR) en el departament...
Article
Full-text available
Among the measures used to manage mosquito populations and prevent human diseases, the application of pesticides is the global strategy mostly employed. To investigate the lethal and sublethal effects of insecticides used to control mosquitoes on amphibians (Rhinella arenarum, Rhinella fernandezae, and Physalaemus albonotatus), tadpoles were expose...
Article
A method for the simultaneous investigation of twenty one veterinary active ingredients in poultry litter based on MCR-ALS modeling of three-way liquid chromatography with fluorescence and UV detection data is presented. The chromatographic procedure was optimized in terms of both the nature of the organic solvent and the pH of the mobile phase to...
Article
The ecological risks posed by two β-diketone antibiotics (DKAs, enrofloxacin, ENR and ciprofloxacin, CPX), characterized by their long persistence in aqueous environments and known deleterious effect on model organisms such as zebrafish were analysed using Rhinella arenarum larvae. Sublethal tests were conducted using environmentally relevant conce...
Article
The effect of the crude homogenate of snail Pomacea canaliculata’s eggs (CHSE) exposition on Rhinella arenarum tadpoles was investigated. Exposure to 10 g CHSE/L treatment produced 95% tadpole mortality, whereas the median lethal concentration (48-h LC50) was 4.35 g/L. Moreover, CHSE inhibited significantly the activities of acetylcholinesterase (A...
Article
Full-text available
We investigated the effects of exposure to molluscicidal metaldehyde (MET) on golden apple snail (GAS) Pomacea canaliculata and Rhinella arenarum tadpoles by assessing mortality and/or other effects via: acute toxicity assays; B-esterase activities (acetilcholinesterase (AChE) and carboxilesterase (CbE)) and oxidative responses (glutathione-S-trans...
Article
An outdoor microcosm was performed with tadpoles (Rhinella arenarum) exposed to 125 μg L À 1 chlor-pyrifos and fed two types of food, i.e., lettuce (Lactuca sativa) and a formulated commercial pellet. Acetylcholinesterase (AChE) and carboxylesterase (CbE) activities were measured in liver and intestine after 10 days of pesticide exposure. Non-expos...
Article
We report complete albinism in Leptodactylus chaquensis (Cei, 1950; Amphibia, Anura) larvae. Two foam nests were collected from an urban lake and maintained in outdoor tanks during metamorphosis. Different proportions of albino larvae and metamorphs occurred. This is the first observation of several larvae of L. chaquensis with albinisms from an ur...
Article
To navigate in space most vertebrates need precise positional cues provided by a variety of sensors, including structures in the inner ear, which are exquisitely sensitive to gravity and linear acceleration. Although these structures have been described in many vertebrates, no information is available for anuran larvae. The purpose of our study was...
Article
Full-text available
Amphibians have complex life cycles with aquatic and terrestrial life and uncovered skins; therefore, they are exposed to chemical contamination, where dermal exposure is a significant route for pesticide uptake in both habitats. In this study, measurements in blood samples such as levels of butyrylcholinesterase (BChE), carboxylesterase (CbE), glu...