マダラスズの化性変異と光周反応

概要

論文の詳細を見る
In Honshu, P. fascipes is univoltine in the north but bivoltine in the south, and there is a transitional area where the two life cycles coexist. A univoltine strain produced diapause eggs even in long days (>14 hr) and its nymphal growth showed a short-day type response. Strains from the transitional area averted diapause in long days, and the critical photoperiod was longer in the north than in the south. They were dimorphic in nymphal development : the fast-growing fraction took the longest time to mature in intermediate days (14 hr), but the slow-growing fraction was delayed by long days. The two fractions thus corresponded to the univoltine and bivoltine cycles, respectively. Hybrids between the univoltine and dimorphic strains developed at an intermediate rate between the parents. Despite this, they would be able to cope with the seasonal changes by the feedback effect of the photoperiodic response on the nymphal development. Therefore, any disruptive selection would not occur.
日本生態学会の論文
1978-12-31