Influence of Temperature and Prey Density on Development, Survival Rate and Predation of Nabis (Nabis) stenoferus (Hemiptera: Nabidae)

The influence of temperature and prey density on development, survival rate and predation of Nabis (Nabis) stenoferus was studied. When eggs and larvae were reared at 20°, 24° and 28°C, the developmental periods were shorter at higher temperatures, but developmental delay was seen at 30°C. The developmental zeros of eggs and larvae were 13.3° and 13.5°C, respectively. The effective accumulative temperature from egg to adult was 321.1 degree-days and the survival rate was the greatest at 24°C. No significant difference was seen in the consumed number of prey at the above temperatures. The larval mortality at 0.5, 1, 3 and 8 prey per day was inversely related to prey density, decreasing as density increased. The total number of consumed prey increased at high prey density.