Behavioural response of terrestrial isopods (Crustacea: Isopoda) to pyrethrins in soil or food

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• 作者：Primo啪 Zidar^a ; ^{primoz.zidar@bf.uni-lj.si} ; Monika Hribar^a ; Suzana 沤i啪ek^b ; ^{Suzana.Zizek@vf.uni-lj.si} ; Jasna &Scaron ; trus^a
• 关键词：Woodlouse ; Porcellio scaber ; Toxicity ; Insecticide ; Avoidance behaviour
• 刊名：European Journal of Soil Biology
• 出版年：2012
• 期刊代码：43_11645563
• 类别：abs
• 出版时间：July-August, 2012
• 卷：51
• 期：Complete
• 页码：51-55
• 文件大小：227 K

摘要

Pyrethrins are natural insecticides that have been on the market for decades. In spite of that only limited data are available on the toxicity of pyrethrins to non-target animals. In our study we hypothesized that a pyrethrin-containing insecticide affects terrestrial isopods but they can decrease the toxic effects by avoidance behaviour. Animals were exposed to the insecticide in its manufactured form either via soil or food at doses normally used. The results revealed that 24聽h exposure to 20聽渭l or more of freshly applied insecticide per gram dry soil, which corresponds to 5.2聽渭g of pyrethrins per cm² of soil, causes paralysis or death of the test animals. The level of regeneration in the next 48聽h was negligible. Upon four-week exposure to food containing the insecticide the quantity of consumed food and the faeces produced decreased. When animals were offered a choice between clean and contaminated soil or food they preferred uncontaminated soil or food. We conclude that isopods are sensitive to pyrethrins. By avoiding contaminated food or soil they can mitigate but probably not entirely prevent the toxic effects of pyrethrins. The behavioural response was found to be of comparable sensitivity with other parameters measured in long-term toxicity tests.