Biological processes in early benthic stages and population dynamics of marine benthic invertebrates

在潮间带沙洲底栖群落的研究中，记录了一些多毛类物种的定居幼体在冬季潮汐作用下的移位，并讨论了这些物种对波浪作用的抵抗率的差异与生活位置的关系。对栖息在沙滩上的寄居蟹进行了交配系统、性别二态、雄性大量迁徙等方面的研究。通过现场实验，证明了获得足够大小的空壳对幼虫成功定居和变态，以及早期底栖生物阶段的存活具有重要意义。潮下沙底Chone sp.的种群结构(多毛类)，在富冈湾的10个固定站点监测其补充强度和存活过程，并对密集种群斑块的持续机制进行了讨论。通过野外实验和水族馆实验研究了种内和种间相互作用对底栖动物群落的影响。以污染指示性多毛虫Capitella Capitata为研究对象，对其营养需要量进行了调查，发现其繁殖力高与食物沉积物中有机氮含量高有密切关系。从寄主藻类的生活史出发，对附着在马尾藻床上的带壳类两足类进行了研究。通过网箱实验，考察了夏季避难种群向新生长的马尾藻的迁徙和捕食对马尾藻产苗量的影响。在富冈湾调查了幼虫的扩散情况，测量了各种底栖生物幼虫的当前状况和时间变化。

In the studies of infaunal community of a intertidal sand flat, shift of settled juveniles of some polychaete species by winter surges was recorded, and the difference of resistivity in those species against wave action was discussed in relation to the life position. On a hermit crab dwelling on the sand flat, researehes on mating system, sexual dimorphism, mass migration of males were published. Through the fieldexperiment, primary importance of the availability of adequate-sized vacant shells on success of settling and metamorphosis of larvae, and survival of earlier benthic stages were demonstrated. On the subtidal sandy bottom, population structure of the Chone sp. (Poly- chaeta) was studied monthly, intensity of recruitment and surviving process were monitored in ten fixed stations in Tomioka Bay, and the persistence mechanisms of dense population patches were discussed. Intra- and interspecific interaction on the infaunal communitywas examined using both field and aquarium experiment. On a pollution indicator polychaete, Capitella capitata, nutrition requirement of the worm was inverstigated, close relation was observed between high reproductive potential of the species and high organic-N content in the food sediment. The caprellid amphipods attached to the Sargassum bed was investigated considering the life cycle of host algae. Immigration from the refuge population in summer to newly grown Sargassum bed and the effect of fish predation in spping decrease was examined by cage experiment. Larval dispersal was investigated in Tomioka Bay, measuring both current regime and temporal variation of various benthos larvae.