魚類の摂食量と食物選択性の関係について : II グッピー(Poecilia reticulata)稚魚をもちいた食物選択実験

概要

論文の詳細を見る
A series of experiments using the juvenile guppy (Poecilia reticulata) was made under laboratory condition to examine how the feeding rate of a fish can be affected by the intensity of food selection. Throughout the experiments, the guppy was placed in a 2-liter nylon screen basket suspended into a glass aquarium. Alive speciments of Daphnia pulex cultured in the laboratory and Cyclops vicinus collected from a reservoir were filtrated with a nylon screen net (1.2mm in mesh). The filtrated plankters were mixed in various ratios and supplied to the fish. Juvenile guppy seemed to prefer D. pulex more than C. vicinus. It was clearly observed that the feeding rate (number of food specimen in the fish intestine/fish body weight/hour) for D. pulex increased significantly with an increase in number of the plankters supplied. In the case of C. vicinus such an increased of feeding rate as in the former species was not observed, and the feeding rate increased in accordance with the decrease of number of D. pulex given together. The total feeding rate (sum of D. pulex and C. vicinus) of guppy increased accompanied by the increase of the total number of plankters supplied. And the greater the proportion of D. pulex to C. vicinus in plankters supplied, the higher the total feeding rate occurred.
日本生態学会の論文
1971-05-31