用蝶啶荧光分析法推断大头金蝇成虫日龄

应用蝶啶荧光分析法分析了常见尸食性蝇类大头金蝇Chrysomyamegacephala成虫头部蝶啶含量与日龄间关系 ,以及温度、性别等对这种关系的影响。结果表明 ,日龄、温度和性别对成虫蝶啶含量均有显著影响 ,其中温度为主要影响因子。在 16℃、2 0℃、2 4℃、2 8℃和 32℃各恒温下 ,成虫头部蝶啶含量与日龄间存在显著的线性关系。雌雄成虫头部蝶啶积累速率 (或 )与温度 (t)的关系分别可用指数函数FV =0 0 12 88×e(0 2 2 41t-3 12 7) +0 36 49(r2 =0 9987)和线性函数MV =0 0 5 74t- 0 36 37(r2 =0 95 5 7)很好地加以拟合。依据恒温试验结果 ,提出了自然变温条件下成虫日龄的 3种候选估测方法 ,证实这 3种方法仅适宜雄成虫而不适于雌成虫 ,其中对雄成虫日龄估测的最小误差平均为 2 5 5d。最后实际应用中如何选用这 3种方法作了讨论。     

The interaction between the coastal brown ant,Pheidole megacephala (Fabricius), and other invertebrate fauna of Mt Coot-tha (Brisbane,Australia)

Abstract Sampling of invertebrate fauna was carried out on Mt Coot-tha, between 25 February and 11 March 1992, to determine whether the presence of the coastal brown ant, Pheidole megacephala (Fabricius), affected die abundance and diversity of other invertebrates. Four plots were sampled; in two the coastal brown ant was present and in two it was absent. The overall abundance of invertebrates did not differ significantly between plots. The abundance of Collembola did vary significantly, but intraplot variability was large. Mite numbers did not differ significantly between plots, except for the family Laelapidae. Abundance of other ant species did not differ significantly between plots, but there was a difference in species composition; Dolichoderinae and Ponerinae were absent or poorly represented in plots where the coastal brown ant was present.