Status quo of invasion by alien species and assessment of their risks to native insects in Satoyama, traditional rural landscapes in Japan

点击翻译按钮获取中文摘要

Investigation on status quo of invasion by alien species and assessment of their risks to native insects in Satoyama, traditional rural landscapes in Japan, were made in coppice woodlands, irrigation ponds, riverine lagoons and so on in Osaka Prefecture, central Japan, and lots of alien species including invasive ones were found. Animal communities in most irrigation ponds and riverine lagoons of the Yodo River were dominated by alien species, and influence of the sika deer on vegetation was observed in coppice woodlands of northern region. It was also clarified that the endangered lycaenid, Zizina emelina, of the Osaka population has spread its distribution by utilizing the white clover, an alien species, as a host plant instead of native Lotus species. Furthermore, ecological risks of alien subspecies recently introduced into Japan to the Japanese endemic subspecies were assessed by rearing experiments in the nymphalid, Hestina assimilis.