当春季来临的时候，它们又开始向北迁飞。
蚜虫迁飞多发生在晴朗的白天，并且温度、光照和风是影响迁飞行为的主导因子。
The migration behaviour usually occurred in the daytime, and the temperature, light and wind were the main influence factors.
迁飞阻碍了不同地理种群间的遗传分化。
The migration could hamper more genetic differentiation among different geographic populations.
地磁定向是昆虫远距离迁飞定向的重要机制之一。
The geomagnetic orientation is one of the important mechanisms for orientation of insects in the long distance migration.
草地螟是一种兼具迁飞和滞育特性的重要农业害虫。
The beet webworm, Loxostege sticticalis Linnaeus (Lepidoptera: Pyralidae), is a serious pest to farming and stockbreeding in Northern China.
取食不同品种的水稻对白背飞虱的飞行能力和再迁飞能力有显著影响。
The flight capacity and re_migration potential of WBPH were influenced significantly by the nutritive conditions of the rice varieties.
迁飞种群中通常存在着迁飞到他处生殖的迁飞型以及留在本地生殖的居留型，其比例因所处的环境因子不同而异。
A migrant population usually consists of parts of migrant and resident, depending on the environmental conditions that the population underwent.
本文分析了1999年各地草地螟主要迁入峰期的天气学背景，并对风场的时空分布及草地螟迁飞轨迹进行了模拟。
We analyzed the weather background during the major immigration period in 1999, and stimulated temporal-spatial dynamics of wind field and migration trajectories of the meadow moth.
由于人造蓄水设施的出现而导致长距离鸟类迁飞路线的改变，代表一种重要的但未证实的、可以将虫媒病毒引进新区的潜在危险。
New routings of long-distance bird migrations, brought about by new man-made water impoundments, represent an important yet still untested risk of introduction of arboviruses into new areas.
本文综述了昆虫在迁飞过程中对大气物理环境的各种行为反应，用边界层气象学的理论重新审视迁飞种群的时空分布，提出了“边界层顶现象”的概念。
Based on boundary layer meteorology, the temporal and spatial distribution and the behaviour of migrating insects were reviewed, and a concept of 'PBL-top phenomena' was pre sented.
图：绿色线路为秋季燕鸥南迁路线；红色线路为其冬季飞行路线；黄色线路为春季燕鸥北飞路线。
See map at right: Green represents autumn/southward migration; red denotes winter range; and yellow represents spring/northward journey.
秋季一到，又到了鸟类飞迁的时候了。
Come autumn, it's time for the bird to prepare to migrate again.
秋季一到，又到了鸟类飞迁的时候了。
Come autumn, it's time for the bird to prepare to migrate again.
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