ملخص
Many species of zooplankton can detect chemical signals (kairomones) released by their predators and respond with defensive morphological and life-history changes. Daphnia longicephala were exposed to five different concentrations of the carbamate insecticide, carbaryl, in the presence and absence of kairomones released by Anisops gratus (Hemiptera: Notonectidae). In the absence of Anisops kairomone, there was a negative correlation between carbaryl concentration and length and brood size at maturity. Growth and reproduction were significantly impaired at carbaryl concentrations ≥0.32 μg/litre. There was no effect of carbaryl on age at maturity and it did not induce crest growth in the absence of kairomone. In the presence of kairomone, D. longicephala developed a large crest, but took longer to reach maturity than control animals. A concentration of 3.2 μg/litre carbaryl decreased relative crest size of 3-day-old daphnids but did not affect crest size of adults. The Anisops kairomone dramatically altered the effects of carbaryl on the life-history responses of D. longicephala at maturity. There was a positive correlation between the concentration of carbaryl and age, length, and brood size at maturity. The effects of kairomone on life-history parameters are explained using a size threshold for maturation hypothesis. Copyright (C) 1998 Elsevier Science Ltd.
اللغة الأصلية | English |
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الصفحات (من إلى) | 217-224 |
عدد الصفحات | 8 |
دورية | Environmental Pollution |
مستوى الصوت | 104 |
رقم الإصدار | 2 |
المعرِّفات الرقمية للأشياء | |
حالة النشر | Published - فبراير 1 1999 |
منشور خارجيًا | نعم |
ASJC Scopus subject areas
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