Půza Vladimír, Mrácek Zdenek
Faculty of Biological Sciences, University of South Bohemia, Branisovská 31, 370 05 Ceské Budejovice, Czech Republic.
J Invertebr Pathol. 2007 Sep;96(1):89-92. doi: 10.1016/j.jip.2007.02.013. Epub 2007 Mar 12.
The effect of dry conditions on the population dynamics of the entomopathogenic nematode (EPN) Steinernema affine was studied for one month in the exceptionally dry period in the summer of 2003 in the oak wood in the vicinity of Ceské Budejovice, Czech Republic. Soil moisture, soil temperature, and the abundance of suitable insect hosts were monitored. The abundance of infective juveniles (IJs) was correlated with soil moisture and both these values were gradually decreasing during the study period and finally rapidly increased at the end of the investigation. During this period there was a decline in the number of insects suitable as hosts for S. affine, but not in numbers of unsuitable insects. We hypothesise that the observed decrease in IJ numbers was probably caused by the persistence of IJs in host cadavers due to low ambient moisture.
2003年夏季，在捷克共和国布杰约维采附近的橡树林中，于异常干燥的时期对昆虫病原线虫（EPN）斯氏线虫（Steinernema affine）的种群动态受干燥条件的影响进行了为期一个月的研究。监测了土壤湿度、土壤温度以及合适昆虫宿主的数量。感染性幼虫（IJ）的数量与土壤湿度相关，在研究期间这两个值都逐渐下降，最终在调查结束时迅速增加。在此期间，适合作为斯氏线虫宿主的昆虫数量有所下降，但不适合的昆虫数量没有下降。我们推测，观察到的IJ数量减少可能是由于环境湿度低，IJ在宿主尸体中持续存在所致。
