Population persistence mechanism of marine benthic invertebrates and analysis of the influence of biotic interactions

在岩石海岸，对无根藤壶进行了种群研究。高潮间带小型物种挑战者Chthamalus challengeri在不同潮位亚种群的生殖特征和种群序列上存在显著差异。估计了各亚种群的总繁殖产量和定居新兵，并讨论了种群的持续机制。对长寿的黑藤壶和鹅颈藤壶也进行了研究。另一方面，以日本石鳖为研究对象，采用排斥笼法研究其放牧和推土作用。本文还研究了岩石岸边流动食草软体动物群落的空间和食物利用情况。附生片脚类甲壳类动物中，马尾藻上的甲壳类动物种群动态表现为藻类生物量的剧烈季节性波动。通过人工漂流实验研究了藻类漂流季节附生动物的命运，记录了卡佩利德的物种特异性反应。本文从生殖策略的角度探讨了母性护理习惯对子代生存的影响。对分布范围北缘造礁珊瑚的生态，通过密集的水下工作，调查了造礁珊瑚的区系和生态分布格局。通过野外和水族馆观察，对温带环境下有性繁殖的可能性进行了考察，证实了13种2种珊瑚有性繁殖，并对产卵的月相周期进行了考察。

In rocky shore, population studies on sessile barnacles were carried out. In Chthamalus challengeri, a small high intertidal species, distinct differences were observed among different tide level sub populations in both reproductive characteristics and demographic population sequences. Total reproductive out put and settled recruits were estimated for each subpopulation, and the population persistence mechanisms were discussed. Long-lived black barnacle and a goose-neck barnacle were also studied. On the other hand, one of the most powerful grazer, common Japanese chiton was investigated for its grazing and bulldozing impact using the inclusion/exclusion cage experiment. Mobile grazing mollusk guild on the boulder shore is also examined for their space and food utilization.For epiphytic amphipod crustacea, population dynamics of caprellids on the Sargassum which shows drastic seasonal fluctuation of algal biomass. The fate of epiphytic animal at the algal drifting season was investigated by artificial drifting experiment, species specific response were recorded among Caprellids. Maternal care habits were discovered in a few caprellids, and its significance for offspring survival was discussed in the context of reproductive strategy.For ecology of reef building corals in the northern periphery of distribution range, fauna and ecological distribution patterns were investigated by intensive underwater works. Possibility of sexual reproduction in the temperate environment was examined both in the field and aquarium observation, sexual reproduction was confirmed in 13 species and 2 morphs of corals, and lunar periodicity of spawning was examined.