富栄養湖沼から発生するアカムシユスリカPropsilocerus akamusi (Tokunaga)の長期的観測 : 成虫大量羽化予測の試み

概要

論文の詳細を見る
The long-term population dynamics of chironomids were investigated in Lake Suwa, a shallow eutrophic lake in Central Japan, in order to clarify the temporal variations in the abundance of Propsilocerus akamusi (Tokunaga). The characteristics of the emergence of P. akamusi from the lake in recent years are (1) shorter emergence periods, (2) smaller number of midges collected, and (3) high ratio of females. These results clearly show that the number of D. akamusi in Lake Suwa has recently tended to decrease. There is significant relationship between the density of larvae in spring and the total number of midges trapped during the emergence period in fall. Thus, it is possible to estimate the focus of massive emergence of the midges from the larval density in the spring.
日本衛生動物学会の論文
2003-03-15