摘要: 寄生密度（parasite density） 某一人群寄生虫病的集中程度，采用几何均数或者个体寄生物计数的加权平均值来计算。如以建立在几何级数基础上的频数分布来计算。
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随着雌蜂密度增加，寄主蛹的寄生率和平均每头寄生蛹中的子蜂数相应提高，但平均每雌产的子蜂数则逐渐减少。
With an increase in female parasitiod density, there was a corresponding increase in pupal parasitization rate and the average number of progeny per parasitized pupae.
增加奇主密度可增加黄腹潜蝇茧蜂的寄生数和穿刺致死数。
The number of larvae parasitized and attacked increased with increase of larvae density.
对中国野生葡萄资源的17个种或变种，共73个株系根围寄生线虫的种类和密度进行了系统的调查与鉴定。
Species and densities of parasitic nematodes were systematically investigated from the rhizosphere soil of 73 clones which belong to 17 species of wild grapes native to China.
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