Acute toxic effects of malathion on the 21st stage larvae of the marsh frog
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Tarih
2008
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info:eu-repo/semantics/openAccess
Özet
Günümüzde, amfibilerde gözlenen azalmalar evrensel bir problem olarak kabul edilmektedir. Bu azalmalara neden olabilecek sebeplerin en önemlilerinden biri, zirai kimyasallar ve özelliklede pestisitlerdir. Bununla birlikte, pestisitlerin amfibi populasyonları üzerindeki etkileriyle ilgili bilgiler hala yeterli değildir. Bu çalışma; statik sistem esas alınarak yapılan akut toksisite testleriyle organikfosforlu bir insektisit olan malathion’un Ova Kurbağası, Rana ridibunda’nın 21. evre larvaları üzerindeki etkilerini ortaya koymaktadır. Sağlıklı 10 larvadan oluşan herbir deneme grubu, 96 saatlik deney süresince, teknik ve ticari malathion’un farklı konsantrasyonlarına maruz bırakılmıştır. Probit analiz programı kullanılarak, 96 saatte %50 ölüme sebep olan malathion konsantrasyonları (LC50) hesaplanmıştır. Bu çalışma sonuçları, 21. evre larvalar üzerinde ticari malathion’un (LC50 = 29 ppm), teknik malathion’dan (LC50 = 38 ppm) daha zehirli olduğunu göstermiştir. Malathion’a maruz bırakılan larvalarda şekil bozuklukları; hiperaktivite semptomları, denge kaybı, hareketsizlik, ölüm gibi bariz toksisite belirtileri ve bu larvaların gelişimlerinde gecikme gözlenmiştir.
Currently, amphibian decline is accepted as a global problem. One of the most important proposed causes for the decline is the use of agrochemicals, especially pesticides. Nevertheless, information about the impact of pesticides on amphibian populations remains scarce. the present study sought to identify the effects of malathion, an organophosphorus insecticide, on 21st stage larvae of the marsh frog, Rana ridibunda, with an acute toxicity test using a static system. Each experimental group contained 10 healthy larvae and was exposed to different concentrations of technical and formulation grade malathion for 96 h. Concentrations of malathion that caused 50% mortality (LC50) at 96 h were estimated using a probit analysis program. the results showed that formulation grade malathion (LC50 = 29 ppm) was more toxic than technical grade malathion (LC50 = 38 ppm). Malformations, certain signs of toxicity (hyperactive symptoms, loss of balance, motionlessness, and death), and growth retardation were observed in malathion-treated larvae.
Currently, amphibian decline is accepted as a global problem. One of the most important proposed causes for the decline is the use of agrochemicals, especially pesticides. Nevertheless, information about the impact of pesticides on amphibian populations remains scarce. the present study sought to identify the effects of malathion, an organophosphorus insecticide, on 21st stage larvae of the marsh frog, Rana ridibunda, with an acute toxicity test using a static system. Each experimental group contained 10 healthy larvae and was exposed to different concentrations of technical and formulation grade malathion for 96 h. Concentrations of malathion that caused 50% mortality (LC50) at 96 h were estimated using a probit analysis program. the results showed that formulation grade malathion (LC50 = 29 ppm) was more toxic than technical grade malathion (LC50 = 38 ppm). Malformations, certain signs of toxicity (hyperactive symptoms, loss of balance, motionlessness, and death), and growth retardation were observed in malathion-treated larvae.
Açıklama
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Kaynak
Turkish Journal of Zoology
WoS Q Değeri
Scopus Q Değeri
Cilt
32
Sayı
1
