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Lethal and sublethal effects of atrazine to amphibian larvae
Joint Authors
Source
Jordan Journal of Biological Sciences
Issue
Vol. 2, Issue 1 (31 Mar. 2009), pp.29-36, 8 p.
Publisher
The Hashemite University Deanship of Academic Research and Graduate
Publication Date
2009-03-31
Country of Publication
Jordan
No. of Pages
8
Main Subjects
Topics
Abstract AR
تم تقييم أثار التلوث بالمبيد الحشري أترازين على يرقات الضفادع باستخدام السمية الحادة و السمية المزمنة ف المختبر.
حيث تم تعريض يرقات الضفدع Ptychadena bibroni البالغ عمرها 1 و 2 يرقات الضفدع Ptychadena bibroni البالغ عمرها 1 و 2 و 3 و 4 أسابيع للتراكيز 200 و 400 و 600 ميكرو جرام في اللتر و كذلك 3و 30 و 100 ميكرو جرام في اللتر.
و تم التقييم بمقارنة نسب الوفيات و مستوى الجلايكوجين و الاستجابات السلوكية باليرقات التي لم تتعرض للتسمم.
و تمت المقارنة حسب طريقة الجمعية الأميركية (ASTM) للفحوصات.
و تم حساب LD50 بعد 96 ساعة.
لقد وجد أن نسبة الوفيات تزداد بازدياد التركيز و مدة التعرض و لكنه يتناقص كلما زاد عمر اليرقة.
لقد وجد إن حساب LD50 يتناقص بزيادة التركيز و المدة و يرتفع بزيادة عمر اليرقة و تراوحت LD50 من 23.06إلى 431.32 مايكرو جرام في اللتر.
تناقصت مستويات الجلايكوجين مع التركيز و ازدادت مع عمر اليرقة.
و تدل النتائج السابقة على وجود تأثير سلوكي و فسيولوجي للمبيد الحشري أترازين على يرقات الضفدع Ptychadena.
و تعتبر هذه النتائج أساسا لوضع الحدود اللازمة لتراكيز الاترازين في المناطق البيئية لمياه دلتا النيجر.
Abstract EN
The effects of Atrazine contamination on amphibian larval stages were assessed, using acute and chronic toxicity in the laboratory.
Tadpoles of Ptychadena bibroni at varying post-hatch developmental stages (1, 2, 3, and 4 weeks) were exposed to environmental relevant treatment concentrations of 200, 400, 600μg / L and 3, 30, 100μg / L for acute and chronic toxicity tests respectively.
The effects were assessed by comparing mortality, glycogen levels and behavioral response of a control group and a group exposed to the pesticide.
The American Society for Testing and Material (ASTM) recommended semi-static renewal bioassay method to be employed, and LC50 was measured at 96 hours.
Percentage of mortality increased with increase in concentration and exposure duration; but decreased as the tadpoles matured.
Mean percentage mortality of tadpoles were significantly affected by concentrations and developmental stages.
Derived 96 hours LC50 values decreased with increase in exposure duration but increased with each successive developmental stage.
Estimated 96 hours LC50 ranged from 230.06 – 431.32μg / L.
Glycogen levels varied negatively with concentrations, but it increased with each successive developmental stage.
Mean glycogen level of tadpoles, exposed to Atrazine, were significantly different in the developmental stages but showed no significant difference with concentrations (F= 1.493, P>0.05).
The above results of acute and chronic exposure to Atrazine indicate marked behavioral and physiological effect of Atrazine on Ptychadena tadpoles.
Results obtained from this study would serve as a fundamental platform for development of Atrazine safety limits for monitoring the waters of the Niger Delta ecological zones of Nigeria.
American Psychological Association (APA)
Ezemonye, L. I. N& Tongo, I.. 2009. Lethal and sublethal effects of atrazine to amphibian larvae. Jordan Journal of Biological Sciences،Vol. 2, no. 1, pp.29-36.
https://search.emarefa.net/detail/BIM-267023
Modern Language Association (MLA)
Ezemonye, L. I. N& Tongo, I.. Lethal and sublethal effects of atrazine to amphibian larvae. Jordan Journal of Biological Sciences Vol. 2, no. 1 (Mar. 2009), pp.29-36.
https://search.emarefa.net/detail/BIM-267023
American Medical Association (AMA)
Ezemonye, L. I. N& Tongo, I.. Lethal and sublethal effects of atrazine to amphibian larvae. Jordan Journal of Biological Sciences. 2009. Vol. 2, no. 1, pp.29-36.
https://search.emarefa.net/detail/BIM-267023
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 34-36
Record ID
BIM-267023