グッピーの生態学的研究 : III.戸倉・上山田温泉の湯尻に環境順化したグッピー個体群について

概要

論文の詳細を見る
Regular surveys were made in 1965-1966 of the guppy population, which had been acclimatized in a short stream of polluted hot spring water in Togura-Kamiyamada spa (N 36°29', E 138°05') about ten years ago. Water temperature of the habitat was maintained at about 20℃ even in winter. These guppies were not cold-resistant. They showed so rapid growth and so great fecundity that they could attain an extreme high level in number (more than 2000/m^2). In summer they began to disperse to irrigation streams and rice fields, and the population number of the guppies in the short stream remarkably decreased. The guppies were euryphageous and they ate even attached bacteria and deposits of the stream. Four characters of tail figure were observed in the male fish. No tendency of shortening in tail length of the male in the natural conditions was observed.
日本生態学会の論文
1967-10-25