我国北方15种蚤的季节数量变动

Seasonl fluctuation of population with regard to 15 species of fleas in Northern part of China

本文报道了我国北方15种蚤的季节数量消长情况。这些蚤的指数，都以夏季为转拆点，即有些蚤指数夏季最高，而另一些则夏季最低。此外，秋季指数均高于春季。

The turning point of seasonal fluctuation of 15 species of fleas reported in the paper,is arised in the summer. In the summer, index of some fleas is the highest, whereas the same of other fleas is the lowest. In addition. the index of these fleas in the autumn is higher than that in the spring.