Long-term investigation of Propsilocerus akamusi (Tokunaga) (Diptera, Chironomidae) from a shallow eutrophic lake, Suwa, in Central Japan : An attempt to forecast the massive emergence of adult midges

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  • HIRABAYASHI Kimio
    Department of Applied Biology, Faculty of Textile Science and Technology, Shinshu University
  • HANAZATO Takayuki
    Research and Education Center for Inlandwater Environment, Shinshu University
  • OGAWARA Makoto
    Research and Education Center for Inlandwater Environment, Shinshu University
  • SAKUMA Masataka
    Research and Education Center for Inlandwater Environment, Shinshu University
  • NAKAMOTO Nobutada
    Department of Applied Biology, Faculty of Textile Science and Technology, Shinshu University

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  • 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

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Abstract

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.

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