Life History Traits of Long- and Short-winged Adults in a Water Strider, Aquarius paludum amamiensis (Miyamoto)

概要

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Aquarius paludum amamiensis is an only subspecies of A. paludum and occurs in Ryukyu and Amami-Oshima islands. The wing length of brachypter of A. p. amamiensis is much shorter than that of A. paludum. Determination of the wing morphs was affected by genetic components and photoperiod ; a long day photoperiod of 15.5L and 8.5D induced macropters and a short day of 10L-14D induced brachypters. The photoperiodic response of this subtropical subspecies in the wing morph determination was opposite to that of A. paludum which occurs in the temperate zone. The average nymphal period of A. p. amamiensis was 33.5 days at 25℃ and much longer than 24.3 days that was documented on A. paludum. The fecundity of brachypter for the first 20 oviposition days is about twice as many as that of macropter, and the difference between the two morphs in A. p. amamiensis is greater than that of A. paludum that has been reported. Some macropterous females of A. p. amamiensis retained their flight muscles without histolysing even after 35 imaginal days, during which they had laid 150 eggs/female or even more. Differentiation into summer migrants and winter non-migrants in A. p. amamiensis seems to be beneficial as the subspecies has been isolated in the small subtropical islands. The differentiation may fit preferentially to the seasonal change of habitat stability ; not stable in dry and hot summer and stable in wet and moderate winter.
日本昆虫学会の論文
1998-06-25