Acute and chronic effects of Cr(VI) on <i>Hypsiboas pulchellus</i> embryos and tadpoles

In the last few years there has been great concern about declines in the abundance of several species of amphibians around the world. Among amphibians, anurans have a biphasic life cycle, with aquatic tadpoles and generally terrestrial adults, and they have an extremely permeable skin, making them e...

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Autores principales: Natale, Guillermo Sebastián, Ammassari, Luciana Lorena, Basso, Néstor Guillermo, Ronco, Alicia Estela
Formato: Articulo
Lenguaje:Inglés
Publicado: 2006
Materias:
Ciencias Exactas
Ciencias Naturales
Anurans
Cr(VI)
Embryo
Growth
Hyla pulchella
Hypsiboas pulchellus
Larvae
Survival
Toxicity
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83171
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83171
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Ciencias Naturales
Anurans
Cr(VI)
Embryo
Growth
Hyla pulchella
Hypsiboas pulchellus
Larvae
Survival
Toxicity
spellingShingle Ciencias Exactas
Ciencias Naturales
Anurans
Cr(VI)
Embryo
Growth
Hyla pulchella
Hypsiboas pulchellus
Larvae
Survival
Toxicity
Natale, Guillermo Sebastián
Ammassari, Luciana Lorena
Basso, Néstor Guillermo
Ronco, Alicia Estela
Acute and chronic effects of Cr(VI) on <i>Hypsiboas pulchellus</i> embryos and tadpoles
topic_facet Ciencias Exactas
Ciencias Naturales
Anurans
Cr(VI)
Embryo
Growth
Hyla pulchella
Hypsiboas pulchellus
Larvae
Survival
Toxicity
description In the last few years there has been great concern about declines in the abundance of several species of amphibians around the world. Among amphibians, anurans have a biphasic life cycle, with aquatic tadpoles and generally terrestrial adults, and they have an extremely permeable skin, making them excellent indicators of the health of the environment. A number of different causes have been suggested for the global decline of anurans, the pollution of their habitat by chemical stressors being considered one of the major factors. Among chemical stressors, heavy metals are known for their high toxicity at very low concentrations. This study assessed short- (96 h, 'acute') and long-term (1272 h, 'chronic') exposure to Cr(VI) at lethal (3 to 90 mg l-1) and sublethal concentrations (0.001 to 12 mg l-1) on Hypsiboas pulchellus (previously called Hyla pulchella; see Faivovich et al. 2005) tadpoles (Fam. Hylidae) from central eastern Argentina. Fertilized eggs collected from a clean pond near La Plata (Buenos Aires Province) were used for acute and chronic toxicity testing. Assays were done under controlled laboratory conditions. Results of chronic exposure were used to assess the effect of factors such as toxicant concentration and age of organisms at the beginning of exposure on the response variables (growth, development and survival until metamorphosis). Results indicated a higher sensitivity to Cr(VI) of individuals first exposed as tadpoles than those first exposed as embryos during acute and chronic exposure. Exposure to the highest sublethal concentrations (6 to 12 mg l-1) of the toxicant showed early inhibitory effects on growth of all treated organisms compensated at longer exposure periods with an increase in the growth rate compared to the control groups.
format Articulo
Articulo
author Natale, Guillermo Sebastián
Ammassari, Luciana Lorena
Basso, Néstor Guillermo
Ronco, Alicia Estela
author_facet Natale, Guillermo Sebastián
Ammassari, Luciana Lorena
Basso, Néstor Guillermo
Ronco, Alicia Estela
author_sort Natale, Guillermo Sebastián
title Acute and chronic effects of Cr(VI) on <i>Hypsiboas pulchellus</i> embryos and tadpoles
title_short Acute and chronic effects of Cr(VI) on <i>Hypsiboas pulchellus</i> embryos and tadpoles
title_full Acute and chronic effects of Cr(VI) on <i>Hypsiboas pulchellus</i> embryos and tadpoles
title_fullStr Acute and chronic effects of Cr(VI) on <i>Hypsiboas pulchellus</i> embryos and tadpoles
title_full_unstemmed Acute and chronic effects of Cr(VI) on <i>Hypsiboas pulchellus</i> embryos and tadpoles
title_sort acute and chronic effects of cr(vi) on <i>hypsiboas pulchellus</i> embryos and tadpoles
publishDate 2006
url http://sedici.unlp.edu.ar/handle/10915/83171
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