| autumn migration of mythimna separata (lepidoptera: noctuidae) over the bohai sea in northern china. | the autumn migration of mythimna separata (walker) (lepidoptera: noctuidae) across the bohai sea was observed with a scanning entomological radar and a searchlight trap at beihuang, an island located in the center of the bohai gulf of northern china, in 2003-2006. during the autumn migration, m. separata flew at the altitudes of 50-500 m, with a displacement speed of 4-12 m/s, toward the southwest. variations of area density of the radar targets and of catches in the searchlight trap through the ... | 2008 | 18559184 |