福岡市におけるゴマダラチョウの生活環におよぼす温度と日長の影響
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概要
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A study was made of the effects of temperature and photoperiod on developmental patterns of Hestina japonica in Fukuoka city. This species was sensitive to day length in the 3rd and 4th instars and diapaused in the 4th or 5th instar under short photoperiodic conditions. The critical photoperiods for inducing larval diapause in the 4th and 5th instars were estimated as 12 hr 40min and 14 hr 10 min, respectively. The heat units required for completion of the overwintering generation (from termination of diapause to emergence) and the non-diapausing generation were 355 degree-days and 898 degree-days above 8℃, respectively. These data were superimposed on the photothermograph of Fukuoka in order to predict the seasonal life cycle. The predicted life cycle corresponded well with the field observations and records of adults collected. In this locality, this species was basically bivoltine but some larvae of the 2nd generation did not diapause. Using these data and observations in several places of its distribution, the geographical variation in voltinism is discussed.
- 1977-03-31