オナジマイマイおよびウスカワマイマイの週期的生殖行動に對する日長効果

概要

論文の詳細を見る
At the natural habitat, Bradybaena similaris stimpsoni (PFEFFER) begins to copulate in the middle part of March and to lay eggs in the first part of May, and Bradybaena (Acusta) sieboldiana (PFEFFER) begins to copulate in the last part of March and to lay eggs in the middle part of May. These behaviors continue till the last part of October. The purpose of the present experiments was to ascertain whether the spring openings of these sexual behaviors were affected by the change in relative day length during winter or not. The snails of each species were placed in the cylindrical glass vessels (diameter 14cm, height 17cm) in groups of thirty. The bottoms of the vessels were covered by the soil ca. 3cm thick. Three these vessels were placed as control in the natural day-night condition in the laboratory, and the other three experimental vessels were subjected to the artificial light, from 60 watt electric lamp, transmitted through 3cm water layer, during adequate periods after sunset as shown in Table 1. Temperature was not regulated. The experiments were commenced at Nov. 17th, 1947, as for similaris and Nov. 27th, 1948, as for sieboldiana, and ended at the next April. The results obtained are shown in Table 1. It may safely be concluded that no special effects on the sexual behaviors, due to changes of relative day length during November to April, were observed.
社団法人日本動物学会の論文
1952-09-15