Ana María Gagneten

Universidad Nacional del Litoral | UNL · Department of Natural Science

El objetivo principal de estos protocolos es dar a conocer herramientas de evaluación y medición que permitirán detectar alteraciones en la calidad de los sistemas socioecológicos ocasionadas por elementos estresantes provenientes de efluentes, lixiviados y descargas originadas de la actividad antrópica en la provincia de Santa Fe y sus potenciales...

El objetivo principal de estos protocolos es dar a conocer herramientas de evaluación y medición que permitirán detectar alteraciones en la calidad de los sistemas socioecológicos ocasionadas por elementos estresantes provenientes de efluentes, lixiviados y descargas originadas de la actividad antrópica en la provincia de Santa Fe y sus potenciales...

The Espinal region (Entre Ríos, Argentina) has suffered land use changes caused by expansion of the agricultural frontier. This expansion has led to an increased use of pesticides. This study is aimed at better understanding the spatial distribution of pesticides in surface water of the Estacas stream, a representative basin of the Espinal region,...

Atrazine (ATZ) is the third most widely used herbicide in Argentina (10 thousand t/year), and is approved for sugar cane, flax, corn, sorghum, and tea. An assessment of the ATZ environmental impacts was conducted at the request of the Ministry of Environment and Sustainable Development of Argentina. A review of 541 national and international techni...

The COVID-19 pandemic affected human life at every level. In this study, we analyzed genetic markers (N and ORF1ab, RNA genes) of SARS-CoV-2 in domestic wastewaters (DWW) in San Justo City (Santa Fe, Argentina), using reverse transcription-quantitative real-time PCR. Out of the 30 analyzed samples, 30% were positive for SARS-CoV-2 RNA. Of the total...

Extreme climatic events are considered one of the main consequences of climate change. In the Pampas region, Argentina, an intensification of rainfall is expected during the periods of maximum agrochemical application. This study assesses the main factors determining the zooplankton community attributes in three streams belonging to the agricultura...

Urban aquatic ecosystems are important sources of fresh water for multiple uses, but often receive a point or diffuse anthropic contamination. Benthic and zooplankton invertebrates are sensitive to water quality, being good indicators of ecosystem health. In this study, the composition and structure of benthic and zooplankton communities and envir...

Land use changes have led to the degradation of multiple ecosystem services and affected the quality of aquatic ecosystems. The aims of this study were (i) to assess the expansion of the agricultural border over the native forest of an Argentinean stream basin and (ii) to characterize the surface water quality, considering physicochemical parameter...

Se estudió la comunidad planctónica (fitoplancton y zooplancton) como indicadora de calidad de agua del río Salado en el área de vuelco del lixiviado postratamiento del relleno sanitario de la ciudad de Santa Fe. Se realizaron muestreos bianuales en verano (VE) e invierno (IN) de 2018 y 2019, en 3 sitios: Aguas Arriba (AA), Punto de Vuelco (PV) y A...

Los lixiviados (LIX) generados en la disposición final de RSU presentan una composición muy compleja, por lo que es necesario tratarlos antes de su vuelco al curso de agua receptor. La eficiencia del tratamiento se relaciona con la presencia de ensambles planctónicos, sin embargo, poco se conoce acerca de estos microorganismos. El objetivo fue iden...

El lixiviado es un líquido formado por contacto de los RSU de rellenos sanitarios de las ciudades. Este líquido es tratado en lagunas artificiales que presentan diferentes etapas fisicoquímicas y biológicas, antes de ser vertidas a los cursos de agua naturales. El objetivo fue identificar y cuantificar diferentes taxa de fito y zooplancton, present...

En cuencas bajo producción agrícola los ambientes acuáticos son receptores del aporte difuso de plaguicidas. Para este estudio se seleccionó la cuenca del arroyo Estacas en el norte de la provincia de Entre Ríos. La cuenca se ubica en un área de monte nativo del espinal, cuya topografía ondulada y suelos con baja capacidad de infiltración, incremen...

Aim: The aim of this study was to experimentally assess the effects of glyphosate formulation on plankton composition by using different community parameters through a mesocosm experiment. Methodology: A 600 l mesocosm experiment was performed for 7 days, including a control (without glyphosate) and two concentrations of glyphosate. Results: Glypho...

This study highlights the monitoring and management of urban water bodies, focusing on plankton biodiversity and its relationship with surface water quality. Physicochemical parameters and concentrations of potentially toxic metals were evaluated in an urban reserve in the Central East of Argentina, created for urban flood risk management. During 1...

La contaminación por plaguicidas en los ecosistemas acuáticos continentales ha aumentado durante los últimos años como consecuencia de actividades agrícolas. El propósito de este estudio fue analizar el efecto de dos formulados de plaguicidas –el herbicida glifosato y el insecticida cipermetrina- sobre el fitoplancton, en mesocosmos. Se ensayaron p...

This study evaluates the acute and chronic toxicological effects of six fluoroquinolones on the mortality and growth of Daphnia magna . The NOECs calculated with the multivariate Probit regression model for the chronic study were 56 μg/L ciprofloxacin, 63 μg/L enrofloxacin, 78 μg/L levofloxacin, 85 μg/L marbofloxacin, 69 μg/L norfloxacin, and 141 μ...

Agrochemicals can reach freshwater bodies by drift, leaching, or runoff, where they constitute complex mixtures. Given that glyphosate and cypermethrin are within the most worldwide used pesticides, they are likely to co-occur in freshwater bodies. The aim of this study was to analyze the interaction between glyphosate and cypermethrin formulations...

La obra es una introducción a la Ecotoxicología para estudiantes universitarios de carreras vinculadas con la Ciencias Ambientales. Se organiza en 14 capítulos que abordan desde una introducción histórica de la disciplina, luego una primera sección por los diferentes tipos de contaminantes y cómo se acumulan en los organismos vivos, seguido por una...

La obra es una introducción a la Ecotoxicología para estudiantes universitarios de carreras vinculadas con la Ciencias Ambientales. Se organiza en 14 capítulos que abordan desde una introducción histórica de la disciplina, luego una primera sección por los diferentes tipos de contaminantes y cómo se acumulan en los organismos vivos, seguido por una...

An increase in the spatial variability of rainfall is expected due to climate change. This implies increasing rainfall rates during spring and summer in the Pampas region, Argentina, period of maximum application of agrochemicals, which might cause an increase in pesticides and nutrients carried to surface water systems, as runoff by rainfall is on...

The widespread and increase use of silver nanoparticles (AgNPs) as antimicrobial, antifungal, and antiviral results in an unknown release and accumulation in the aquatic environment and consequently in the trophic chain. In this chapter, different methods for AgNPs synthesis, use and applications, environmental concentration, potential mechanisms o...

The objective of this work was to compare through chronic tests, the sublethal effects of two compounds: the antifungal commercial Pellital Bio-F36 (TCMTB), and a synthetic eco-friendly gemini (Gem-3e) compound in Daphnia magna. Both compounds are used in the industry as antifungals for the preservation of woods and leathers. The attributes of life...

The combination of the indiscriminate use of antibiotics such as ciprofloxacin (CIP) and the recent use of biocides such as silver nanoparticles (AgNPs) that are eventually disposed of in the environment can negatively impact on aquatic biota. This work aims to develop a simple electrochemical method to detect CIP, AgNPs, and their mixtures (CIP–Ag...

BACKGROUND Under scarcity of freshwater, the reuse and low‐cost technological solutions applied to wastewaters seek to reduce contamination to the users and freshwater biota. RESULTS A low‐cost cellulose membrane was doped with silver nanoparticles to filter urban wastewater (UW) from a city of Argentina. The total amount of coliforms and Escheric...

Resumen Este capítulo sintetiza información sobre bioindicadores de ambientes acuáticos en la Región de Humedales del Corredor Fluvial Chaco-Mesopotámico y del Corredor Fluvial Paraguay- Paraná. Se incluyen estudios sobre macroinvertebrados bentónicos, de áreas vegetadas en humedales y zooplanctónicos referidos a las asociaciones de especies indica...

Microbiota structure changes throughout the treatment of wastewater according to the prevailing physicochemical characteristics. Under optimal conditions, prokaryotic and eukaryotic assemblages participate in the coordinated sequential elimination of contaminants. The relevance of the identification and quantification of the prevailing microorganis...

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...

We conducted the first complete toxicological study of six quinolones, including acute, chronic, and recovery assays in Daphnia magna and Ceriodaphnia dubia. The assayed quinolones were ciprofloxacin (CIP), norfloxacin (NOR), enrofloxacin (ENR) and marbofloxacin (MAR) of second-generation; levofloxacin (LEV) of third-generation and moxifloxacin (MO...

Las actividades antrópicas generan desechos que son liberados al ambiente, ocasionando desequilibrios en los ecosistemas cuando la cantidad supera su capacidad de recuperación. El creciente interés en establecer relaciones entre el uso de la tierra y la calidad ambiental de los ecosistemas fluviales, refleja la preocupación social y la necesidad de...

Las actividades antrópicas generan desechos que son liberados al ambiente, ocasionando desequilibrios en los ecosistemas cuando la cantidad supera su capacidad de recuperación. El creciente interés en establecer relaciones entre el uso de la tierra y la calidad ambiental de los ecosistemas fluviales, refleja la preocupación social y la necesidad de...

Effluent treatment plants are designed to transform biodegradable material into nontoxic products, to capture suspended solids and nonsedimentable colloids, and to transform or remove nutrients and contaminants of different origin. The efficiency of the treatment depends, among other factors, on the physicochemical composition of the effluent to be...

The toxic effects of silver nanoparticles (AgNPs) on the physiology and morphology of the green microalga Chlorella vulgaris were studied. AgNPs were characterized by particle size distribution, ζ potential measurement, and atomic force microscopy (AFM). Chlorella vulgaris was exposed to 90 to 1440 μg/L of AgNPs range in Bold's Basal Medium for 96...

We conducted the first complete toxicological study of six quinolones, including acute, chronic, and recovery assays on Daphnia magna and Ceriodaphnia dubia. The assayed quinolones were second-generation ciprofloxacin (CIP), norfloxacin (NOR), enrofloxacin (ENR), and marbofloxacin (MAR); third-generation levofloxacin (LEV), and fourth-generation mo...

Agro-industrial production generates large volumes of effluents with a high content of solids, nutrients, organic matter, and microorganisms. These effluents can negatively modify natural environments that receive them by surface runoff or infiltration through the soil, with possible damage to the population’s health. The objective of the circular...

This study aimed to assess how bioturbation by freshwater benthic macroinvertebrates with different biological traits alone or in combination could modify trace elements (TE) fate between sediment and water, and if water TE concentration and animal TE content impair their body stores. Three macroinvertebrate species were exposed to TE contaminated...

La Reserva Natural Urbana del Oeste (RNUO) (Santa Fe, Argentina) se establece como parte del plan de gestión de riesgo hídrico de la ciudad; sus reservorios recolectan agua de lluvia y de escorrentía de la ciudad, siendo ésta bombeada posteriormente hacia el Río Salado. El objetivo general de este trabajo fue estudiar la diversidad taxonómica y fun...

Las prácticas agrícolas pueden impactar sobre la calidad de los cursos de agua dulce a través del aporte difuso de plaguicidas por deriva, escurrimiento o erosión. En Entre Ríos las características naturales de topografía ondulada y la baja capacidad de infiltración de sus suelos incrementan el riesgo de contaminación de los cursos de agua superfic...

The general objective of this work is to experimentally assess the effects of acute glyphosate pollution on two freshwater cladoceran species (Daphnia magna and Ceriodaphnia dubia) and to use this information to predict the population dynamics and the potential for recovery of exposed organisms. Five to six concentrations of four formulations of gl...

Este trabajo se realizó en el Laboratorio de Ecotoxicología de la Facultad de Humanidades y Ciencias de la Universidad Nacional del Litoral ante la demanda de la ONG Muyuqui de la ciudad de San Justo (Santa Fe). El objetivo fue determinar la presencia de plaguicidas en cuerpos de agua periurbanos de la ciudad de San Justo y evaluar posibles efectos...

La incorporación de tierras a la agricultura produce procesos de degradación de recursos naturales e incremento de riesgos ambientales, siendo los plaguicidas potenciales fuentes de contaminación de agua superficial. Objetivo: caracterizar diferentes áreas de aporte de plaguicidas dentro de una cuenca hidrográfica, para seleccionar áreas de monitor...

This work presents the development of a sensitive and friendly environment electrochemical methodology with high analytical performance for quinolone detection. The method is based on square-wave anodic stripping voltammetry which is simple and reliable for determination of quinolone family on the bismuth film electrode (BiFE). The deposition poten...

Behavioral changes have been considered as appropriate to evaluate sublethal effects of pollutants. The aim of this study was to evaluate the effects of a mixture of pesticides, with glyphosate and 2,4-D (Gly + 2,4-D) as active ingredients, on the zooplankton evasion behavior from the fish Cnesterodon decemmaculatus. An increase in the evasion beha...

The present study focuses on the evaluation of metal (chromium, copper, and lead), arsenic, and pesticide (atrazine and endosulfan) contamination in freshwater streams of one of the most important agricultural and industrial areas of central-eastern Argentina, which has not been reported earlier. The environmental fate of inorganic microcontaminant...

Biopolymers comprise a large variety of molecules with diverse chemical structures involving from polysaccharides to proteins, bioplastics, polyamides, polyesters, among others. Also, biopolymers are very abundant in nature and one major wastes of industrial and agricultural activities contributing to the environmental pollution. On the other side,...

Phycoremediation, which uses the purifying capacity of microalgae and macroalgae to eliminate or biotransform contaminants, has emerged as a technology for wastewater treatment. The objective of the present work is to evaluate the potential of Chlorella vulgaris to remove nutrients present in effluents generated in a dairy farm and to know the conc...

In aquatic systems, physical and chemical alarm signals favor early detection of predators and promote the development of antipredation behaviors in prey. However, further studies are needed to understand how different antipredation behavior could be among different species coexisting in a natural assembly. In this study, we conducted an indoor exp...

El objetivo del presente trabajo fue evaluar, a traves de ensayos cronicos de 21 dias, los efectos de cuatro formulaciones comerciales deglifosato (Eskoba® (Red Surcos), Panzer Gold® (Dow Agrosciences),Sulfosato Touchdown® (Syngenta Agro) y Roundup Ultramax® (Monsanto)) sobre atributos de historia de vida y el parametro poblacionalR o de Daphnia ma...

The environmental pollution caused by pesticides is considered a major problem worldwide. Glyphosate is one of the herbicides most widely used, and its use has increased sharply in the last years. In this work, the toxicity of four commercial glyphosate formulations (Eskoba®, Panzer Gold®, Roundup Ultramax® and Sulfosato Touchdown®) was assessed by...

Ecotoxicity studies using two glyphosatebased formulations (Eskoba® and Sulfosato Touchdown®) were undergone with three microcrustacean species to establish their LC50 values and to evaluate the efficacy of cleaning treatments with UV/H2O2.Samples were collected at the beginning of the process −50 mg acid equivalent per liter of glyphosate without...

A series of N-acetylated cationic gemini surfactants (3a-e) having dimeric structures derived from tertiary amines were synthesized. Their antifungal potency and surface properties were determined. It also studied the acute toxicity of the molecule with the best performance and the best water so-lubility (3e) through Chlorella vulgaris and Daphnia...

This study analyzed the acute effects of a glyphosatebased herbicide (Eskobat) on the microalgae Chlorella vulgaris, the cladoceran Simocephalus vetulus, and the copepod Notodiaptomus conifer, and evaluated the recovery ability of the surviving microcrustaceans. Survival, age of first reproduction, and fecundity were used as endpoints for S. vetulu...

Chronic toxicity tests were conducted to assess the effect of Cu, Cr and Pb on Moinodaphnia macleayi and Ceriodaphnia dubia -two cladoceran species from the Argentinian Fluvial Littoral Zone (AFLZ)- and Daphnia magna -an holarctic species-. The specimens were exposed to three concentrations of each metal. As endpoints, the number of living and dead...

Advances oxidation processes (AOPs) could be convenient to treat waters contaminated by pesticides. The main problems with AOPs are their cost and the usually long processing times. However, the total destruction of pollutants is not always necessary. One way to reduce the operating cost is to determine the toxicity of the treated water at differen...

The present study analyzes the acute and behavioral toxicity of two commercial formulations of endosulfan and atrazine (Gesaprim 90 WDG® and Zebra Ciagro®, respectively) on the cyclopoid copepod Mesocyclops longisetus. The studied behavior was the “escape ability” because of its ecological importance in natural predator–prey interactions. This was...

Chemical communication is one of the most important ecological phenomena promoting the maintenance of ecosystem dynamics. In predator-prey interactions, mediation signals allow prey to detect their predators and can be crucial in the process of avoiding them. Since organisms in many natural waterbodies are often subjected to anthropogenic stressors...

The purpose of this work was to experimentally analyze the impact of copper, chromium and a commercial pesticide with endosulfan on the escape behavior of two copepods (Notodiaptomus conifer, Argyrodiaptomus falcifer) and three cladocerans (Daphnia magna, Pseudosida variabilis and Ceriodaphnia dubia). The experimental assays were carried out using...

Lead (Pb) is known as an important aquatic contaminant with different toxic effects on various organisms. Until now, only few quantitative investigations have been published comparing Pb content in different organs of adult freshwater crabs. Their capacity to bioaccumulate other heavy metals is already known, and they can potentially transfer Pb to...

El incremento de los metales en los cuerpos de agua dulce a causa de las actividades antropogénicas genera importantes alteraciones sobre la biota. Esta revisión analiza los efectos adversos de varios metales de relevancia ecotoxicológica sobre los microcrustáceos zooplanctónicos (cladóceros y copépodos), los avances experimentales en esta línea y...

In natural predator–prey interactions, chemical communication is one of the most advantageous strategies for prey organisms because they can anticipate possible harm by means of phenotypic changes. This study compares the changes in the behaviour of four freshwater zooplankton species in the presence and absence of infochemicals from the same preda...

Among zooplankton behaviors, diel migrations constitute one of the most effective predator avoidance strategy and confer metabolic and demographic advantages. We aim to examine whether sublethal concentrations of two widespread pollutants (a pesticide with endosulfan and chromium as potassium dichromate) alter the depth selection, vertical migratio...

Recent works have emphasized on the serious problems caused by the toxicity of pesticides and heavy metals on aquatic ecosystems due to human activities. The aim of this work was to evaluate the toxicities of an insecticide with endosulfan as active element and the metals copper and chromium on the littoral cladocera ctenopoda, Pseudosida variabili...