关键词: 棉蚜, 捕食性天敌, 时间生态位, 空间生态位

Abstract: Macrobrachium rosenbergii juveniles and adults were exposed to different concentration tributyltin (TBT) to study the acute and chronic effects of TBT
 on the growth of M. rosenbergii and on the histological structure of the shrimp’s gill and hepatopancrese. For the juvenile and adult of M. rosenbergii, the 96 h median lethal concentration (96 h LC₅₀) was 51 and 376 μg·L^-1, and the safe concentration (SC) was 5.1 and 37.6 μg·L^-1, respectively. Compared with the control group, the body weight and length of juvenile M. rosenbergii after exposed to 1.25, 2.5, and 5 μg·L^-1 of TBT for 30 d decreased significantly (P<0.05), while the growth of adult M. rosenbergii after exposed to 2, 8, and 32 μg·L^-1 of TBT for 30 d was less affected, but the histological structure of gill and hepatopancrese appeared abnormal. When the TBT concentration reached 8 μg·L^-1, the gill epithelial cells of treated M. rosenbergii swelled, nucleus in support cells contracted, and blood cells in blood cavity aggregated. Correspondingly, liver cells swelled and vacuolated. When the TBT concentration reached 32 μg·L^-1, liver cells vacuolated more seriously, nucleus disappeared, and parts of the cells disaggregated and appeared necrosis, showed that definite concentration TBT had strong toxicity to the gill and hepatopancrese of M. rosenbergii.

Key words: Aphis gossypii, Predatory enemy, Temporal niche, Spatial niche