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Cristina Silvia Perez Coll - One of the best experts on this subject based on the ideXlab platform.
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Comparative toxicity of endosulfan and diazinon on the embryo-larval development of the South American Toad, Rhinella arenarum
International Journal of Environment and Health, 2017Co-Authors: Carolina Mariel Aronzon, Gabriela Veronica Svartz, Cristina Silvia Perez CollAbstract:The toxicities of endosulfan and diazinon were comparatively analysed on the early development of the South American Toad, Rhinella arenarum. Pesticides varied greatly in their effects on survival, with concentration-, time- and stage-dependent sensitivity. Endosulfan was 227 times more toxic than diazinon. The larval period was the most sensitive for both pesticides (LC-504 h: 0.01 mg L-1 and 1.92 mg L-1 for endosulfan and diazinon, respectively). Endosulfan toxicity increased 587 and 60 times from acute to chronic exposure in treatments with embryos and larvae, respectively, while diazinon toxicity increased about four and five times, respectively. Both pesticides caused important neurotoxic effects expressed as behavioural disturbances. Risk evaluation assessed by hazard quotient (HQ) was over 1, the level of concern (LOC), for both pesticides at chronic exposure periods and even at acute endosulfan exposure. Results obtained in the present study highlight that these pesticides should be considered potential threats for this species.
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Joint toxicity of copper and diazinon during embryonic and larval development of the common South American Toad, Rhinella arenarum
Chemistry and Ecology, 2016Co-Authors: Carolina Mariel Aronzon, Gabriela Veronica Svartz, Cristina Silvia Perez CollAbstract:ABSTRACTCopper (Cu) and diazinon are two widely distributed pollutants; they coexist in agro-ecosystems and cause toxicity to wild biota. This study proposes to analyse the joint toxicity of binary mixtures of Cu and diazinon on the early development of the South American Toad, Rhinella arenarum by means of a standardised test. Cu was always more toxic than diazinon. Cu was more embryotoxic while the pesticide was more toxic during the larval exposure than during the embryonic period. The different Cu/diazinon mixtures proportions assayed were significantly less toxic than expected by additive effects. Thus, an antagonistic interaction pattern was observed. This pattern was independent of the assayed proportion, the exposure times and the exposure developmental periods. In the risk assessment analysis to establish water quality criteria, the joint toxicity should be considered at different ratios, exposure time and life period for a certain species, in order to preserve wild species.
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comparative sensitivity among early life stages of the south American Toad to cypermethrin based pesticide
Environmental Science and Pollution Research, 2016Co-Authors: Gabriela Veronica Svartz, Cristina Silvia Perez Coll, Carolina Mariel AronzonAbstract:Cypermethrin is one of the most widely used pesticides due to its low mammalian and bird toxicity, but it is extremely toxic to aquatic organisms. The aim of the present study was to evaluate the toxicity of a commercial formulation of cypermethrin on the embryo-larval development of Rhinella arenarum. An ecological risk assessment based on the hazard quotient (HQ) approach was performed. The results showed that cypermethrin toxicity was stage-dependent and dramatically increased during the larval period. Thus, larvae were more sensitive than embryos, obtaining at the end of the experiment a 336-h median lethal concentration (LC50) of 0.65 μg cypermethrin/L. Cypermethrin exposure caused morphological abnormalities such as general underdevelopment, edema, gill malformations, and behavioral alterations as hyperkinesia and spasmodic contractions. The 168-h teratogenic index was 5, implying a high risk for embryos to be malformed in the absence of significant embryonic lethality. Based on the results of the toxicity effects and the ecological risk assessed (HQ for chronic exposure > level of concern), this pesticide should be considered as a direct (effects on survival) or indirect (severe sublethal effects) risk for conservation purposes of this amphibian in agroecosystems.
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Differential uptake of endosulfan in the South American Toad under sublethal exposure.
Archives of environmental contamination and toxicology, 2015Co-Authors: Gabriela Veronica Svartz, Damian Jose Gabriel Marino, Alicia Estela Ronco, Cristina Silvia Perez CollAbstract:Agroecosystems are usually polluted with a wide variety of contaminants with pesticides being very frequently detected. Endosulfan, an organochlorine pesticide, has been shown to cause both lethal and sublethal effects on aquatic organisms such as amphibians and especially on its early developmental stages. In this context, the aim of this study was to evaluate the uptake of environmentally relevant concentrations of endosulfan and its correlation with differential sensitivity in the early development stages of the common South American Toad, Rhinella arenarum. Embryos and larvae were exposed to sublethal concentrations of endosulfan for several periods of exposures. According to the developmental stage at which they were exposed, the uptake rate was different. Bioconcentration factors (BCFs) for embryos significantly decreased with exposure time and concentration (p < 0.05) reaching a BCF of ≤1679 for embryos at 96 h of exposure to 0.001 mg endosulfan L−1. BCFs for larvae significantly increased with exposure time (p < 0.05) obtaining a maximum of 40 at 504 h. In our previous study, we reported that embryos were less sensitive to the effects of endosulfan than larvae, which is in line with the main tendency of embryos to bioconcentrate endosulfan as observed in this study.
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toxicity of endosulfan on embryo larval development of the south American Toad rhinella arenarum
Environmental Toxicology and Chemistry, 2014Co-Authors: Gabriela Veronica Svartz, Ianina Ruth Hutler Wolkowicz, Cristina Silvia Perez CollAbstract:Endosulfan is a widely used pesticide despite its extreme toxicity to a variety of taxa and its worldwide ban. The aim of the present study was to evaluate the acute and chronic toxicity of endosulfan on the embryonic-larval development of the common South American Toad Rhinella arenarum. The results showed that lethal and sublethal effects increased with concentration and exposure time. The sensitivity to endosulfan increased during the larval period, the complete operculum stage (S.25) being the most sensitive (504-h median lethal concentration [LC50] = 0.01 mg endosulfan/L; 10% lethal concentration [LC10] = 0.004 mg endosulfan/L). Endosulfan exposure caused morphological abnormalities such as general underdevelopment, edema, gill malformations, and cellular dissociation as well as neurotoxicity. Our results also showed that larvae exposed to concentrations of 0.005 mg endosulfan/L and 0.01 mg endosulfan/L completed metamorphosis earlier than controls, but with underdevelopment. The 240-h teratogenic index was 6.13, implying a high risk for embryos to be malformed in the absence of significant embryonic lethality. Because the hazard quotients for chronic exposure were over 1, the level of concern value and toxicity endpoints obtained in the present study for R. arenarum occurred at concentrations lower than the levels of endosulfan reported in the environment, this pesticide should be considered a potential risk for this species. Environ Toxicol Chem 2014;33:875–881. © 2013 SETAC
Gabriela Veronica Svartz - One of the best experts on this subject based on the ideXlab platform.
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Comparative toxicity of endosulfan and diazinon on the embryo-larval development of the South American Toad, Rhinella arenarum
International Journal of Environment and Health, 2017Co-Authors: Carolina Mariel Aronzon, Gabriela Veronica Svartz, Cristina Silvia Perez CollAbstract:The toxicities of endosulfan and diazinon were comparatively analysed on the early development of the South American Toad, Rhinella arenarum. Pesticides varied greatly in their effects on survival, with concentration-, time- and stage-dependent sensitivity. Endosulfan was 227 times more toxic than diazinon. The larval period was the most sensitive for both pesticides (LC-504 h: 0.01 mg L-1 and 1.92 mg L-1 for endosulfan and diazinon, respectively). Endosulfan toxicity increased 587 and 60 times from acute to chronic exposure in treatments with embryos and larvae, respectively, while diazinon toxicity increased about four and five times, respectively. Both pesticides caused important neurotoxic effects expressed as behavioural disturbances. Risk evaluation assessed by hazard quotient (HQ) was over 1, the level of concern (LOC), for both pesticides at chronic exposure periods and even at acute endosulfan exposure. Results obtained in the present study highlight that these pesticides should be considered potential threats for this species.
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Joint toxicity of copper and diazinon during embryonic and larval development of the common South American Toad, Rhinella arenarum
Chemistry and Ecology, 2016Co-Authors: Carolina Mariel Aronzon, Gabriela Veronica Svartz, Cristina Silvia Perez CollAbstract:ABSTRACTCopper (Cu) and diazinon are two widely distributed pollutants; they coexist in agro-ecosystems and cause toxicity to wild biota. This study proposes to analyse the joint toxicity of binary mixtures of Cu and diazinon on the early development of the South American Toad, Rhinella arenarum by means of a standardised test. Cu was always more toxic than diazinon. Cu was more embryotoxic while the pesticide was more toxic during the larval exposure than during the embryonic period. The different Cu/diazinon mixtures proportions assayed were significantly less toxic than expected by additive effects. Thus, an antagonistic interaction pattern was observed. This pattern was independent of the assayed proportion, the exposure times and the exposure developmental periods. In the risk assessment analysis to establish water quality criteria, the joint toxicity should be considered at different ratios, exposure time and life period for a certain species, in order to preserve wild species.
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comparative sensitivity among early life stages of the south American Toad to cypermethrin based pesticide
Environmental Science and Pollution Research, 2016Co-Authors: Gabriela Veronica Svartz, Cristina Silvia Perez Coll, Carolina Mariel AronzonAbstract:Cypermethrin is one of the most widely used pesticides due to its low mammalian and bird toxicity, but it is extremely toxic to aquatic organisms. The aim of the present study was to evaluate the toxicity of a commercial formulation of cypermethrin on the embryo-larval development of Rhinella arenarum. An ecological risk assessment based on the hazard quotient (HQ) approach was performed. The results showed that cypermethrin toxicity was stage-dependent and dramatically increased during the larval period. Thus, larvae were more sensitive than embryos, obtaining at the end of the experiment a 336-h median lethal concentration (LC50) of 0.65 μg cypermethrin/L. Cypermethrin exposure caused morphological abnormalities such as general underdevelopment, edema, gill malformations, and behavioral alterations as hyperkinesia and spasmodic contractions. The 168-h teratogenic index was 5, implying a high risk for embryos to be malformed in the absence of significant embryonic lethality. Based on the results of the toxicity effects and the ecological risk assessed (HQ for chronic exposure > level of concern), this pesticide should be considered as a direct (effects on survival) or indirect (severe sublethal effects) risk for conservation purposes of this amphibian in agroecosystems.
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Differential uptake of endosulfan in the South American Toad under sublethal exposure.
Archives of environmental contamination and toxicology, 2015Co-Authors: Gabriela Veronica Svartz, Damian Jose Gabriel Marino, Alicia Estela Ronco, Cristina Silvia Perez CollAbstract:Agroecosystems are usually polluted with a wide variety of contaminants with pesticides being very frequently detected. Endosulfan, an organochlorine pesticide, has been shown to cause both lethal and sublethal effects on aquatic organisms such as amphibians and especially on its early developmental stages. In this context, the aim of this study was to evaluate the uptake of environmentally relevant concentrations of endosulfan and its correlation with differential sensitivity in the early development stages of the common South American Toad, Rhinella arenarum. Embryos and larvae were exposed to sublethal concentrations of endosulfan for several periods of exposures. According to the developmental stage at which they were exposed, the uptake rate was different. Bioconcentration factors (BCFs) for embryos significantly decreased with exposure time and concentration (p < 0.05) reaching a BCF of ≤1679 for embryos at 96 h of exposure to 0.001 mg endosulfan L−1. BCFs for larvae significantly increased with exposure time (p < 0.05) obtaining a maximum of 40 at 504 h. In our previous study, we reported that embryos were less sensitive to the effects of endosulfan than larvae, which is in line with the main tendency of embryos to bioconcentrate endosulfan as observed in this study.
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toxicity of endosulfan on embryo larval development of the south American Toad rhinella arenarum
Environmental Toxicology and Chemistry, 2014Co-Authors: Gabriela Veronica Svartz, Ianina Ruth Hutler Wolkowicz, Cristina Silvia Perez CollAbstract:Endosulfan is a widely used pesticide despite its extreme toxicity to a variety of taxa and its worldwide ban. The aim of the present study was to evaluate the acute and chronic toxicity of endosulfan on the embryonic-larval development of the common South American Toad Rhinella arenarum. The results showed that lethal and sublethal effects increased with concentration and exposure time. The sensitivity to endosulfan increased during the larval period, the complete operculum stage (S.25) being the most sensitive (504-h median lethal concentration [LC50] = 0.01 mg endosulfan/L; 10% lethal concentration [LC10] = 0.004 mg endosulfan/L). Endosulfan exposure caused morphological abnormalities such as general underdevelopment, edema, gill malformations, and cellular dissociation as well as neurotoxicity. Our results also showed that larvae exposed to concentrations of 0.005 mg endosulfan/L and 0.01 mg endosulfan/L completed metamorphosis earlier than controls, but with underdevelopment. The 240-h teratogenic index was 6.13, implying a high risk for embryos to be malformed in the absence of significant embryonic lethality. Because the hazard quotients for chronic exposure were over 1, the level of concern value and toxicity endpoints obtained in the present study for R. arenarum occurred at concentrations lower than the levels of endosulfan reported in the environment, this pesticide should be considered a potential risk for this species. Environ Toxicol Chem 2014;33:875–881. © 2013 SETAC
Geoffrey R Smith - One of the best experts on this subject based on the ideXlab platform.
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Effects of an Invasive Fish (Gambusia affinis) and Anthropogenic Nutrient Enrichment on American Toad (Anaxyrus Americanus) Tadpoles
Journal of Herpetology, 2012Co-Authors: Geoffrey R Smith, Christopher J. DibbleAbstract:Abstract Pollution and the introduction of nonnative predators, typically fish, are two frequent human-associated stressors in freshwater ecosystems. Amphibians appear to be particularly susceptible to these stressors. We conducted a mesocosm experiment to examine the independent and interactive effects of an invasive fish, the Western Mosquitofish (Gambusia affinis), and ammonium nitrate, an agricultural fertilizer, on American Toad (Anaxyrus Americanus) tadpoles. Mosquitofish tended to have a negative effect on American Toad survivorship. American Toad metamorphs from mesocosms with mosquitofish were smaller than those from mesocosms without mosquitofish. Mosquitofish also delayed metamorphosis of the American Toads. Ammonium nitrate addition did not affect survivorship. However, American Toad metamorphs from ammonium nitrate addition treatments were smaller than those from treatments without ammonium nitrate addition. Mosquitofish and ammonium nitrate addition each had independent effects on American T...
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Interaction Between Two Species of Tadpoles Mediated By Nutrient Enrichment
Herpetologica, 2012Co-Authors: Geoffrey R Smith, Amber A. BurgettAbstract:Abstract Anthropogenic stressors, such as contaminants or pollutants, can change the outcome of competition in a variety of communities. We examined potential competitive interactions between American Toad (Anaxyrus Americanus) and Gray Treefrog (Hyla versicolor) tadpoles by manipulating the presence and absence of each species and overall tadpole density and how they may be affected by anthropogenic nutrient enrichment by manipulating the presence and absence of nitrate and phosphate. Interactions with Gray Treefrogs did not affect American Toad survivorship, mass at metamorphosis, or time to metamorphosis. Nutrient enrichment reversed the relative effects of interspecific and intraspecific conditions on Gray Treefrog survivorship. Namely, in enriched mesocosms Gray Treefrog tadpoles living with American Toad tadpoles had higher survivorship than those in Gray Treefrog–only communities, whereas the opposite was true in no-enrichment mesocosms. Nutrient enrichment accelerated metamorphosis in American Toa...
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Effects of the Anuran Tadpole Assemblage and Nutrient Enrichment on Freshwater Snail Abundance (Physella sp.)
The American Midland Naturalist, 2012Co-Authors: Geoffrey R Smith, Amber A. Burgett, Jessica E. RettigAbstract:Abstract Alterations of aquatic ecosystems, such as nutrient enrichment and changes in community composition, can potentially have effects that pervade the entire community. We investigated the effects of nutrient enrichment and changes in the presence and density of two species of tadpoles, American Toad (Anaxyrus Americanus) and Gray treefrog (Hyla versicolor), on freshwater snail abundance (Physella sp.). At low tadpole density, there was no difference in the abundance of Physella sp. among treatments. At high tadpole density, treatments with both species of tadpoles present and nutrient enrichment had a higher abundance of Physella than all other treatment combinations. Mesocosms with high tadpole densities had lower periphyton dry mass than those with low overall tadpole density. At the end of the experiment, increased abundance of Physella was related to earlier metamorphosis in A. Americanus and H. versicolor and higher proportions of H. versicolor metamorphosing and surviving. Nutrient enrichment ...
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Growth, abnormalities, and mortality of tadpoles of American Toad exposed to combinations of malathion and nitrate.
Environmental toxicology and chemistry, 2010Co-Authors: Sannanegunda V. Krishnamurthy, Geoffrey R SmithAbstract:American Toad tadpoles (Bufo Americanus) were exposed to malathion and nitrate in a fully factorial experiment that crossed four concentrations of malathion ranging between 0 and 1,000 µg malathion/L, and five concentrations of nitrate ranging from 0 to 16 mg NO(3) -N/L to identify single and interactive effects. In this 21-d experiment, we recorded tadpole length, mass, survivorship, and frequencies of diamond-shaped and stiff-tail abnormalities. Malathion increased frequency of diamond-shaped and stiff-tail abnormalities, and negatively affected survivorship, but did not affect tadpole size. Nitrate did not affect survivorship but did have sublethal effects, including effects on tadpole length and the frequency of both abnormalities. The interaction of malathion and nitrate has no effect on survivorship or tadpole size but did affect the frequency of abnormalities, with nitrate reducing malathion's effect. Results of the present study suggest that at the environmentally realistic concentrations used in our experiment, malathion has both lethal and sublethal effects, but nitrate had only sublethal effects on American Toad tadpoles. The combination of malathion and nitrate had limited effects at the tested concentrations under laboratory conditions. However, the effect of the combined treatments on the frequency of tadpole developmental abnormalities suggests that such interactions may play a role under field conditions, in which pesticide and nitrate fertilizers are typically applied simultaneously.
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Differential effects of malathion and nitrate exposure on American Toad and Wood Frog tadpoles.
Archives of environmental contamination and toxicology, 2010Co-Authors: Geoffrey R Smith, S. V. Krishnamurthy, Anthony C. Burger, Leonard B. MillsAbstract:Organisms living in aquatic ecosystems are increasingly likely to be exposed to multiple pollutants at the same time due to the simultaneous use of several pesticides and fertilizers. We examined the single and interactive effects of environmentally realistic concentrations of nitrate and malathion on two species of tadpoles common in agricultural regions of the United States—the American Toad (Bufo Americanus) and the Wood Frog (Rana sylvatica)—using a fully factorial mesocosm experiment that crossed four concentrations of malathion ranging from 0 to 1000 μg/l and two concentrations of nitrate (0 or 8 mg/l). In both B. Americanus and R. sylvatica, malathion delayed metamorphosis compared to controls, even at the lowest concentration of malathion. Malathion did not affect survivorship in either species. B. Americanus metamorphs were smaller in malathion treatments, whereas R. sylvatica were larger in malathion treatments. Nitrate did not affect survivorship or metamorph size in either species, but did accelerate time to metamorphosis in R. sylvatica. The interaction between nitrate and malathion had no effects in B. Americanus and had no effect on R. sylvatica survivorship or metamorph size. However, in the 250 μg/l and 500 μg/l malathion treatments, nitrate reduced the negative effect of malathion on time to metamorphosis in R. sylvatica such that there was little if any delay in metamorphosis compared to the controls in these treatment combinations. This observation suggests that the presence of nitrate might ameliorate the effects of malathion on R. sylvatica. Our results suggest that malathion could have significant effects on anuran populations and communities and that nitrate might potentially mediate such effects in some species.
Pérez Coll Cristina Silvia - One of the best experts on this subject based on the ideXlab platform.
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Comparative toxicity of endosulfan and diazinon on the embryo-larval development of the South American Toad, Rhinella arenarum
'Inderscience Publishers', 2017Co-Authors: Aronzon Carolina Mariel, Svartz, Gabriela Veronica, Pérez Coll Cristina SilviaAbstract:The toxicity of endosulfan and diazinon were comparatively analyzed on the early development of the South American Toad, Rhinella arenarum. Pesticides varied greatly in their effects on survival, with concentration-, time- and stage-dependent sensitivity. Endosulfan was 227 times more toxic than diazinon. The larval period was the most sensitive for both pesticides (LC-504h: 0.01mgL-1 and 1.92mgL-1 for endosulfan and diazinon, respectively). Endosulfan toxicity increased 587 and 60 times from acute to chronic exposure in treatments with embryos and larvae, respectively while diazinon toxicity increased about 4 and 5 times, respectively. Both pesticides caused important neurotoxic effects expressed as behavioral disturbances. Risk evaluation assessed by Hazard Quotient (HQ) was over 1, the level of concern, for both pesticides at chronic exposure periods and even at acute endosulfan exposure. Results obtained in the present study, highlight that these pesticides should be considered potential threats for this species.Fil: Aronzon, Carolina Mariel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Martín. Instituto de Investigación en Ingeniería Ambiental; ArgentinaFil: Svartz, Gabriela Veronica. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Martín. Instituto de Investigación en Ingeniería Ambiental; ArgentinaFil: Perez Coll, Cristina Silvia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Martín. Instituto de Investigación en Ingeniería Ambiental; Argentin
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Joint toxicity of copper and diazinon during embryonic and larval development of the common South American Toad, Rhinella arenarum
'Informa UK Limited', 2016Co-Authors: Aronzon Carolina Mariel, Svartz, Gabriela Veronica, Pérez Coll Cristina SilviaAbstract:Copper (Cu) and diazinon are two widely distributed pollutants; they coexist in agro-ecosystems and cause toxicity to wild biota. This study proposes to analyse the joint toxicity of binary mixtures of Cu and diazinon on the early development of the South American Toad, Rhinella arenarum by means of a standardised test. Cu was always more toxic than diazinon. Cu was more embryotoxic while the pesticide was more toxic during the larval exposure than during the embryonic period. The different Cu/diazinon mixtures proportions assayed were significantly less toxic than expected by additive effects. Thus, an antagonistic interaction pattern was observed. This pattern was independent of the assayed proportion, the exposure times and the exposure developmental periods. In the risk assessment analysis to establish water quality criteria, the joint toxicity should be considered at different ratios, exposure time and life period for a certain species, in order to preserve wild species.Fil: Aronzon, Carolina Mariel. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental. - Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigación e Ingeniería Ambiental; ArgentinaFil: Svartz, Gabriela Veronica. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental. - Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigación e Ingeniería Ambiental; ArgentinaFil: Perez Coll, Cristina Silvia. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental. - Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigación e Ingeniería Ambiental; Argentin
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Differential Uptake of Endosulfan in the South American Toad Under Sublethal Exposure
'Springer Science and Business Media LLC', 2015Co-Authors: Svartz, Gabriela Veronica, Marino, Damian Jose Gabriel, Ronco, Alicia Estela, Pérez Coll Cristina SilviaAbstract:Agroecosystems are usually polluted with a wide variety of contaminants with pesticides being very frequently detected. Endosulfan, an organochlorine pesticide, has been shown to cause both lethal and sublethal effects on aquatic organisms such as amphibians and especially on its early developmental stages. In this context, the aim of this study was to evaluate the uptake of environmentally relevant concentrations of endosulfan and its correlation with differential sensitivity in the early development stages of the common South American Toad, Rhinella arenarum. Embryos and larvae were exposed to sublethal concentrations of endosulfan for several periods of exposures. According to the developmental stage at which they were exposed, the uptake rate was different. Bioconcentration factors (BCFs) for embryos significantly decreased with exposure time and concentration (p < 0.05) reaching a BCF of ≤1679 for embryos at 96 h of exposure to 0.001 mg endosulfan L−1. BCFs for larvae significantly increased with exposure time (p < 0.05) obtaining a maximum of 40 at 504 h. In our previous study, we reported that embryos were less sensitive to the effects of endosulfan than larvae, which is in line with the main tendency of embryos to bioconcentrate endosulfan as observed in this study.Fil: Svartz, Gabriela Veronica. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Marino, Damian Jose Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaFil: Ronco, Alicia Estela. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaFil: Perez Coll, Cristina Silvia. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental; Argentina. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
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Developmental toxicity and risk assessment of nonylphenol to the South American Toad, Rhinella arenarum.
Environmental toxicology and pharmacology, 2014Co-Authors: Aronzon Carolina Mariel, Babay Paola Alejandra, Pérez Coll Cristina SilviaAbstract:Abstract The toxicity of Nonylphenol, an emerging pollutant, on the common South American Toad Rhinella arenarum was stage and time dependent, thus Median Lethal Concentrations (LC50) for acute (96 h), short-term chronic (168 h) and chronic exposure (336 h) were 1.06; 0.96 and 0.17 mgNP/L from embryonic period (S.4), whereas for exposure from larvae (S.25), LC50 remained constant at 0.37 mgNP/L from 96 h to 168 h, decreasing to 0.11 mgNP/L at 336 h. NOEC-168 h for exposure from embryos was 0.025 mgNP/L. The Teratogenic Potential (NOEC-lethality/NOEC-sublethal effects) was 23 times higher than the threshold value, indicating a high risk for embryos to be malformed in absence of significant lethality and representing a threat for the species conservation. By comparing with other amphibians, the early development of R. arenarum was very sensitive to NP. The results highlight the relevance of extending the exposure time and look for the most sensitive stage in order to perform the bioassays for conservation purposes.
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Developmental toxicity and risk assessment of nonylphenol to the South American Toad, Rhinella arenarum.
Elsevier Science Bv, 2014Co-Authors: Aronzon Carolina Mariel, Babay Paola Alejandra, Pérez Coll Cristina SilviaAbstract:Artículo (Manuscripto aceptado por el editor)The toxicity of Nonylphenol, an emerging pollutant, on the common South American Toad Rhinella arenarum was stage and time dependent, thus Median Lethal Concentrations (LC50) for acute (96 h), short-term chronic (168 h) and chronic exposure (336 h) were 1.06; 0.96 and 0.17 mgNP/L from embryonic period (S.4), whereas for exposure from larvae (S.25), LC50 remained constant at 0.37 mgNP/L from 96 h to 168 h, decreasing to 0.11 mgNP/L at 336 h. NOEC-168 h for exposure from embryos was 0.025 mgNP/L. The Teratogenic Potential (NOEC-lethality/NOEC-sublethal effects) was 23 times higher than the threshold value, indicating a high risk for embryos to be malformed in absence of significant lethality and representing a threat for the species conservation. By comparing with other amphibians, the early development of R. arenarum was very sensitive to NP. The results highlight the relevance of extending the exposure time and look for the most sensitive stage in order to perform the bioassays for conservation purposes.Fil: Aronzon, Carolina Mariel. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Babay, Paola Alejandra. Comisión Nacional de Energía Atómica; ArgentinaFil: Perez Coll, Cristina Silvia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental; Argentin
Alfredo Salibián - One of the best experts on this subject based on the ideXlab platform.
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blood lead content in a peri urban population of the south American Toad bufo arenarum
Science of The Total Environment, 2001Co-Authors: Marcos A Arrieta, Carina Apartin, Carolina Elena Rosenberg, Nilda E Fink, Alfredo SalibiánAbstract:Blood Pb concentration in a South American Toad Bufo arenarum population (n = 152) was determined over 10 samplings carried out between December 1996 and November 1999. The studied population lived in the surroundings of the La Plata City, the largest industrial-urban setting of the Buenos Aires Province, Argentina. The presence of the metal was detected in all the samples tested, the mean concentration range being 1.99-4.66 mg dl(-1). Some preliminary environmental data on soil content of Pb in the sampling area suggest the anthropogenic origin of the metal possibly due to high rate of Pb-containing gasoline utilisation until recently. The reported results may reflect a sequel of a sustained local air-soil-water pollution process.