| Organophosphorus pesticides effect on early stages of the axolotl Ambystoma mexicanum (Amphibia: Caudata). | |
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MedLine Citation:
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PMID: 19012946 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Ambystoma mexicanum is an endemic salamander of Xochimilco, a wetland of the basin of Mexico valley. Nowadays, axolotl populations are decreasing due environmental stressors. Particularly, studies about organophosphorus pesticides (OPPs; i.e. chlorpyrifos and malathion) toxicity are of great importance due to their intensive use in agricultural activities in Xochimilco. Thus, the aim of this study was to evaluate under controlled conditions the toxicity of chlorpyrifos (CPF) and malathion (MLT) on embryos and larvae (stage 44 and 54) of A. mexicanum. Embryos and larvae were exposure 96h from 0.5 to 3mg CPFL(-1) and from 10 to 30mg MLTL(-1) in independent tests. Embryos at the end of this period were maintained 9d without pesticide in order to identify possible recuperation. Differences obtained in mortality, hatching success, development, morphological abnormalities, behaviour and activity, suggest that toxicity of CPF and MLT differs in embryos and larval stages. Embryos were less sensitive to OPPs acute exposure than axolotl larvae; additionally, toxicity of CPF in larval stages was greater than MLT. On the other hand, data obtained in axolotl embryos during the period of recuperation to CPF in particular as delay and inhibition of development, malformations and success of hatching, indicated that these responses turned out more sensitive than mortality. This study allowed to identify the toxicological potential of OPPs on early developmental stages of A. mexicanum and it is a valuable contribution for the future management of the axolotl wild population. |
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Authors:
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C Robles-Mendoza; C García-Basilio; S Cram-Heydrich; M Hernández-Quiroz; C Vanegas-Pérez |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-11-13 |
Journal Detail:
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Title: Chemosphere Volume: 74 ISSN: 1879-1298 ISO Abbreviation: Chemosphere Publication Date: 2009 Feb |
Date Detail:
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Created Date: 2009-01-19 Completed Date: 2009-03-27 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0320657 Medline TA: Chemosphere Country: England |
Other Details:
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Languages: eng Pagination: 703-10 Citation Subset: IM |
Affiliation:
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Laboratorio de Ecofisiología, Universidad Nacional Autónoma de México, México DF 04510, Mexico. crm@fciencias.unam.mx |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Ambystoma mexicanum
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embryology* Animals Chlorpyrifos / toxicity* Embryo, Nonmammalian / metabolism Malathion / toxicity* Organophosphorus Compounds / toxicity Pesticides / toxicity* |
| Chemical | |
Reg. No./Substance:
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0/Organophosphorus Compounds; 0/Pesticides; 121-75-5/Malathion; 2921-88-2/Chlorpyrifos |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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