Pesticide effects on crabs: How environmental concentrations of endosulfan and chlorpyrifos affect embryos |
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Authors: | Carlos L. Negro Lidia E. Senkman Fernanda Marino Eduardo Lorenzatti Pablo Collins |
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Affiliation: | 1. National Institute of Limnology (CONICET - UNL) University City - Paraje El Pozo, Santa Fe, Argentina;2. Superior School of Health, School of Biochemistry and Biological Sciences (UNL) University City - Paraje El Pozo, Santa Fe, Argentinaleonegro82@hotmail.com;4. School of Science and Technology (UADER), Paraná, Entre Ríos, Argentina;5. Institute of Technological Development for the Chemical Industry (CONICET - UNL), Santa Fe, Argentina;6. Superior School of Health, School of Biochemistry and Biological Sciences (UNL) University City - Paraje El Pozo, Santa Fe, Argentina;7. Institute of Technological Development for the Chemical Industry (CONICET - UNL), Santa Fe, Argentina;8. Superior School of Health, School of Biochemistry and Biological Sciences (UNL) University City - Paraje El Pozo, Santa Fe, Argentina |
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Abstract: | The objectives of this work were to evaluate the effects of environmentally relevant chlorpyrifos and endosulfan, concentrations in the incubation period, effective hatching and survival of embryos and neonates of the freshwater burrowing crab, Zilchiopsis collastinensis (Decapoda, Trichodactylidae). Both pesticides were prepared from commercial and technical grade products. The exposure to about 100, 200, and 400 ng endosulfan L?1, and 48, 240, and 1,200 ng chlorpyrifos L?1 did not cause differences in the incubation period or in effective hatching but decreased survival of neonates, especially in the concentrations prepared from the technical grade product. Even if these concentrations are below the median lethal concentration (LC50) values for embryos, these caused a significant decrease in the survival of neonates, i.e. when crabs are outside the egg and not protected by chorion. The decrease in the neonate population caused by these concentrations, which could be found in the environment, might impact aquatic communities. |
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Keywords: | Agricultural pollution crustaceans embryos neonates |
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