PDF(Pubmed)
Abstract：
Many insect pests are long-distance migrants, moving from lower latitudes where they overwinter to higher latitudes in spring to exploit superabundant, but seasonally ephemeral, host crops. These seasonal long-distance migration events are relatively easy to recognize, and justifiably garner much research attention. Evidence indicates several pest species that overwinter in diapause, and thus inhabit a year-round range, also engage in migratory flight, which is somewhat \"invisible\" because displacement is nondirectional and terminates among conspecifics. Support for aseasonal, undirected migration is related to recognizing true migratory flight behavior, which differs fundamentally from most other kinds of flight in that it is nonappetitive. Migrating adults are not searching for resources and migratory flight is not arrested by encounters with potential resources. The population-level consequence of aseasonal, undirected migration is spatial mixing of individuals within the larger metapopulation, which has important implications for population dynamics, gene flow, pest management, and insect resistance management.
摘要：
许多害虫是长途移民，春季从越冬的低纬度地区转移到高纬度地区，以开发过剩资源，但是季节性短暂，寄主作物。这些季节性长途迁徙事件相对容易识别，并理所当然地获得了很多研究关注。证据表明有几种害虫在滞育中越冬，因此居住在全年的范围内，还从事迁徙飞行，这有点“不可见”，因为位移是无方向性的，在特定物种之间终止。对季节性的支持，无向迁移与识别真实的迁移飞行行为有关，它与大多数其他类型的飞行根本不同，因为它没有食欲。迁移的成年人不会寻找资源，并且不会因遇到潜在资源而阻止迁移。季节性的人口水平后果，无方向迁移是个体在较大群体中的空间混合，这对人口动态有重要影响，基因流，害虫管理，和昆虫抗性管理。
