为探究干露胁迫对脊尾白虾存活率和氧化应激反应的影响,设置常温干燥、常温湿润、低温干燥和低温湿润4个胁迫试验组及1个对照组,计算各组胁迫后12.0 h内脊尾白虾累计存活率,并分析各组胁迫后2.5 h内肌肉中过氧化氢酶、谷胱甘肽过氧化物...为探究干露胁迫对脊尾白虾存活率和氧化应激反应的影响,设置常温干燥、常温湿润、低温干燥和低温湿润4个胁迫试验组及1个对照组,计算各组胁迫后12.0 h内脊尾白虾累计存活率,并分析各组胁迫后2.5 h内肌肉中过氧化氢酶、谷胱甘肽过氧化物酶、超氧化物歧化酶活性和丙二醛含量变化。试验结果显示,各组累计存活率差异显著( P <0.05),3.0 h常温干燥组个体全部死亡,常温湿润、低温干燥和低温湿润等3个试验组的累计存活率分别为6.7%、38.9%和40.0%。4个试验组过氧化氢酶活性和谷胱甘肽过氧化物酶活性均显著高于对照组( P <0.05);超氧化物歧化酶活性呈先降后升趋势,在1.0 h和2.5 h时显著升高( P <0.05);丙二醛含量呈先升后降趋势,在1.0 h和 1.5 h时显著升高( P <0.05)。试验结果表明,低温湿润可以提高脊尾白虾存活率,干露环境条件可诱导脊尾白虾产生氧化应激反应,过氧化氢酶、谷胱甘肽过氧化物酶、超氧化物歧化酶活性和丙二醛含量变化明显,可作为干露条件下脊尾白虾机体健康监测指标。展开更多
Trophic interaction among various biomass groups in a swimming crab Portunus trituberculatus polyculture pond was investigated using carbon and nitrogen stable isotope analysis. The polycultured animal species also in...Trophic interaction among various biomass groups in a swimming crab Portunus trituberculatus polyculture pond was investigated using carbon and nitrogen stable isotope analysis. The polycultured animal species also included white shrimp Litopenaeus vannamei, short-necked clam Ruditapes philippinarum, and redlip mullet Liza haematochila. The mean δ^(13)C value for all the biomass groups in polyculture ecosystem ranged from -25.61‰ to -16.60‰, and the mean δ^(15)N value ranged from 6.80‰ to 13.09‰. Significant difference in the δ^(13)C value was found between particulate organic matter(POM) and sediment organic matter(SOM)(P < 0.05), indicating that these two organic matter pools have different material sources. Assuming that a ^(13)C-enrichment factor of 1.00‰ and a ^(15)N-enrichment factor of 2.70‰ existed between consumer and prey, diets of the four cultured animals were estimated using a stable isotope mixing model. The estimated model results indicated that P. trituberculatus mainly feed on Aloidis laevis; L. vannamei mainly feed on shrimp feed; while A. laevis, R. philippinarum and L. haematochelia mainly feed on POM. Shrimp feed was also an important food source of R. philippinarum and L. haematochelia. The diets of P. trituberculatus, L. vannamei, R. philippinarum, and L. haematochila showed complementary effects in this polyculture ecosystem. Our finding indicated that the polyculture of these four organisms with suitable farming density could make an effective use of most of the food sources, which can make a highly efficient polyculture ecosystem.展开更多
文摘为探究干露胁迫对脊尾白虾存活率和氧化应激反应的影响,设置常温干燥、常温湿润、低温干燥和低温湿润4个胁迫试验组及1个对照组,计算各组胁迫后12.0 h内脊尾白虾累计存活率,并分析各组胁迫后2.5 h内肌肉中过氧化氢酶、谷胱甘肽过氧化物酶、超氧化物歧化酶活性和丙二醛含量变化。试验结果显示,各组累计存活率差异显著( P <0.05),3.0 h常温干燥组个体全部死亡,常温湿润、低温干燥和低温湿润等3个试验组的累计存活率分别为6.7%、38.9%和40.0%。4个试验组过氧化氢酶活性和谷胱甘肽过氧化物酶活性均显著高于对照组( P <0.05);超氧化物歧化酶活性呈先降后升趋势,在1.0 h和2.5 h时显著升高( P <0.05);丙二醛含量呈先升后降趋势,在1.0 h和 1.5 h时显著升高( P <0.05)。试验结果表明,低温湿润可以提高脊尾白虾存活率,干露环境条件可诱导脊尾白虾产生氧化应激反应,过氧化氢酶、谷胱甘肽过氧化物酶、超氧化物歧化酶活性和丙二醛含量变化明显,可作为干露条件下脊尾白虾机体健康监测指标。
基金supported by the National Great Project of Scientific and Technical Supporting Programs(No.2011BAD13B03)the Programs for Excellent Youth Foundation of Shandong Province(No.JQ201009)
文摘Trophic interaction among various biomass groups in a swimming crab Portunus trituberculatus polyculture pond was investigated using carbon and nitrogen stable isotope analysis. The polycultured animal species also included white shrimp Litopenaeus vannamei, short-necked clam Ruditapes philippinarum, and redlip mullet Liza haematochila. The mean δ^(13)C value for all the biomass groups in polyculture ecosystem ranged from -25.61‰ to -16.60‰, and the mean δ^(15)N value ranged from 6.80‰ to 13.09‰. Significant difference in the δ^(13)C value was found between particulate organic matter(POM) and sediment organic matter(SOM)(P < 0.05), indicating that these two organic matter pools have different material sources. Assuming that a ^(13)C-enrichment factor of 1.00‰ and a ^(15)N-enrichment factor of 2.70‰ existed between consumer and prey, diets of the four cultured animals were estimated using a stable isotope mixing model. The estimated model results indicated that P. trituberculatus mainly feed on Aloidis laevis; L. vannamei mainly feed on shrimp feed; while A. laevis, R. philippinarum and L. haematochelia mainly feed on POM. Shrimp feed was also an important food source of R. philippinarum and L. haematochelia. The diets of P. trituberculatus, L. vannamei, R. philippinarum, and L. haematochila showed complementary effects in this polyculture ecosystem. Our finding indicated that the polyculture of these four organisms with suitable farming density could make an effective use of most of the food sources, which can make a highly efficient polyculture ecosystem.
