Transfer characteristics and effects of cadmium in noctuidae insects-stink bug Arma chinensis
Soil cadmium(Cd)pollution not only harms plants but also affects phytophagous insects and their natural enemies through plant absorption into the food chain.In this paper,the transfer characteristics,and effects of Cd in noctuidae insect-stink bug Arma chinensis were studied by feeding Spodoptera litura and Spodoptera frugiperda to pupae with artificial diets adding different Cd concentrations(0,4.06 mg/kg and 40.6 mg/kg),and then rearing A.chinensis with above pupae.The results showed that the Cd uptake,excretion,and accumulation of S.litura and S.frugiperda,and Cd uptake and accumulation of A.chinensis were dose-response to Cd concentrations in diet,namely increasing with the increase of Cd concentrations in the diet.The bioconcentration factor(BCF)of the diet to noctuidae insects was greater than 1,indicating that noctuidae insects biomagnified Cd,whereas the biomagnification factor(BMF)of noctuidae insects'pupae to A.chinensis was less than 1,indicating that Cd bio-dilution has occurred.4.06 mg/kg Cd stress significantly reduced the relative growth rate(RGR)of S.frugiperda larvae but had no effect on the RGR of S.litura,which was significantly correlated with insect Cd accumulation and BCF.40.6 mg/kg Cd stress significantly changed the food utilization,inhibited larval growth and development of noctuid insects,and reduced the weight of A.chinensis feeding on S.litura pupae,but Cd stress had no effect on the survival of A.chinensis.Therefore,although Cd has no biomagnification in phytophagous insects-predators,there are still biotoxic effects.
Heavy metal transfercadmium stressSpodoptera lituraSpodoptera frugiperdaArma chinensis
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万方数据
