飼育条件下における水棲貧毛類Tubifex hattaiの卵二形について

概要

論文の詳細を見る
In recent years, two types of eggs, large and small, laid by laboratory reared Tubifex hattai NOMURA have been observed. Two-hundred individuals of newly hatched worms from each type of the egg were reared separately in mud mixed with dried yeast for food over a period of about 10 months. Mortality, live weight, fecundity and rate of hatch individuals from the eggs in deposited cocoons were recorded weekly. There were differences between the large and small types. Further, mixed cultures of the two type, such as 150:50, 100:100, 50:150 individuals, were reared under the same condition with a pure culture. Their fecundities and hatchabilities were recorded weekly after separating each type of egg inside the cocoons deposited by mixed individuals. The values so obtained were similar when the data for the pure culture was compared to that of the same type of mixed cultures, whereas the values showed significant differences between large and small types of pure and mixed cultures. Accordingly, the results suggested that there was no copulation between large and small individuals. When length of body, number of segments and number of setae was measured, all comparisons also showed differences between large and small individuals.
社団法人日本動物学会の論文
1983-09-25