Newly emerged larvae of the fleshfly, Boettcherisca peregrina were exposed to two different CdCl2 concentrations of 100μg/g and 400 mg/g diet fresh weight （DFW）. They were administered in the diets until the end of...Newly emerged larvae of the fleshfly, Boettcherisca peregrina were exposed to two different CdCl2 concentrations of 100μg/g and 400 mg/g diet fresh weight （DFW）. They were administered in the diets until the end of larval stage. Cd-exposed larvae accumulated significant amounts of Cd and this accumulation increased with the exposure dose and time. The body weights were lightened and lengths of larvae were shortened considerably after Cd exposure, especially at the higher Cd concentration. The total larval duration was also extremely affected due to Cd exposure. The average duration was prolonged significantly by 14 h at the lower Cd concentration, while it was increased by 33.7 h over controls at the higher Cd concentration. A significant decrease in contents of either soluble proteins, total lipids or caloric values in the hemolymph occurred due to Cd exposure throughout the entire tested period but after 120 h of Cd exposure. In contrast, when exposed to Cd with its higher concentration, total sugar contents in the hemolymph were increased strikingly over the whole tested time, except after 96 h of Cd exposure, while they were not apparently altered except after 24 h of Cd exposure at the lower concentration. Thus, it is suggested that Cd exposure shows significant adverse impact on the growth and development, as well as metabolism, in larvae of this fleshfly, depending on its exposure time and dose.展开更多
Effects of copper （Cu） accumulation by the flesh fly Boettcherisca peregrina （R.- D.） （Diptera： Sarcophagidae） on the ectoparasitic wasp Nasonia vitripennis （Walker） （Hymenoptera： Pteromalidae） were invest...Effects of copper （Cu） accumulation by the flesh fly Boettcherisca peregrina （R.- D.） （Diptera： Sarcophagidae） on the ectoparasitic wasp Nasonia vitripennis （Walker） （Hymenoptera： Pteromalidae） were investigated experimentally by exposing host larvae to contaminated diets with final Cu concentrations of 400μg/g and 800μg/g diet fresh weight （DFW）, respectively. Results showed that Cu can be transferred along food chains to secondary consumers （parasitoids） in small amounts, resulting in negative effects on parasitoid growth and development （body weight and developmental duration） as well as fecundity （number of offspring per female）. Copper exposure also inhibited vitellogenesis ofparasitoids from Cu-contaminated host pupae. It is suggested that the decreased fecundity and inhibition of vitellogenesis ofN. vitripennis resulted from poor host nutritional state rather than from direct effects of Cu stress.展开更多
文摘Newly emerged larvae of the fleshfly, Boettcherisca peregrina were exposed to two different CdCl2 concentrations of 100μg/g and 400 mg/g diet fresh weight （DFW）. They were administered in the diets until the end of larval stage. Cd-exposed larvae accumulated significant amounts of Cd and this accumulation increased with the exposure dose and time. The body weights were lightened and lengths of larvae were shortened considerably after Cd exposure, especially at the higher Cd concentration. The total larval duration was also extremely affected due to Cd exposure. The average duration was prolonged significantly by 14 h at the lower Cd concentration, while it was increased by 33.7 h over controls at the higher Cd concentration. A significant decrease in contents of either soluble proteins, total lipids or caloric values in the hemolymph occurred due to Cd exposure throughout the entire tested period but after 120 h of Cd exposure. In contrast, when exposed to Cd with its higher concentration, total sugar contents in the hemolymph were increased strikingly over the whole tested time, except after 96 h of Cd exposure, while they were not apparently altered except after 24 h of Cd exposure at the lower concentration. Thus, it is suggested that Cd exposure shows significant adverse impact on the growth and development, as well as metabolism, in larvae of this fleshfly, depending on its exposure time and dose.
基金Acknowledgments This work was supported by the National Basic Research and Development Program of China （2006CB 102005）, the National Natural Science Foundation of China （Grants No. 30230070, 30270899）, the Program for New Century Excellent Talents in University of the Ministry of Education of China （NCET-05-0513）, and the Innovation Research Team Program of the Ministry of Education of China （Grant No. IRT0535）.
文摘Effects of copper （Cu） accumulation by the flesh fly Boettcherisca peregrina （R.- D.） （Diptera： Sarcophagidae） on the ectoparasitic wasp Nasonia vitripennis （Walker） （Hymenoptera： Pteromalidae） were investigated experimentally by exposing host larvae to contaminated diets with final Cu concentrations of 400μg/g and 800μg/g diet fresh weight （DFW）, respectively. Results showed that Cu can be transferred along food chains to secondary consumers （parasitoids） in small amounts, resulting in negative effects on parasitoid growth and development （body weight and developmental duration） as well as fecundity （number of offspring per female）. Copper exposure also inhibited vitellogenesis ofparasitoids from Cu-contaminated host pupae. It is suggested that the decreased fecundity and inhibition of vitellogenesis ofN. vitripennis resulted from poor host nutritional state rather than from direct effects of Cu stress.
