ヘンゲボヤPolycitor proliferus OKAの群体の成長と分裂

概要

論文の詳細を見る
Ascidian colony is developed from a single zooid which derived from a tadpole larva. The growth of the colony is brought about by the proliferation of the zooids. When a colony of Polycitor proliferus retains a certain size, it divides into two or three small colonies. How does the colony know its size? To answer this question we measured size of the colonies selecting three parameters, length of the colony, number of the zooids, and the area of the colony. The size of the colonies is variable with localities, seasons and microtopography of the coast. Simulation experiments by computer revealed that experiments agreed very closely with the observations if the probability of colony division rised along the sigmoid curve. Environmental factors such as temperature, pH and disolved oxygen may affect the probability of colony division. In summer, aged zooids are sexually mature. Mature zooids were abundant in the large colonies. While, they were scarecely observed in the small colonies. Therefore, the possible role rejuvenation, from the large old colonies is indicated in the division of the colonies.
横浜国立大学の論文
1992-03-27