Social Structure, Life History and Sex Determination in the Paraemonid Shrimps Associated with Sea Anemones.

本研究的最初目的是比较的生活史和社会组织之间的三个paraemonid虾，Periclimenes ornatusB，P. Magnificus和Thor amboinensis，与海葵在日本爱媛县宇和海浅水。至于后两个物种，我们未能得到详细的数据，因为他们的人口密度低。本文简要介绍了我国对丽纹拟步行虫的研究概况。在一个20 × 60米的样方约110个主机海葵，这个物种的虾每月审查16个月，并在结算季节（8月至11月）每10天审查。由于该种仅在宿主海葵的盘和触手上生活，从不在宿主之间迁移，因此即使是在浮游期之后的最早的幼虾也可以定量计数，并且通常可以在没有标记或标记的情况下识别个体。（2）存活率，宿主大小对迁入数量的影响，宿主大小对迁入数量的影响，以及迁入数量的季节变化（居民对存活率的影响，存活曲线），（3）生长和成熟（4）繁殖系统（5）繁殖过程（产卵间隔、窝卵数与雌体大小的关系、孵化期与水温的关系）;（6）净繁殖率。我们正准备公布这些结果。

The original aim of this study was to compare the life history and social organization among three paraemonid shrimps, Periclimenes ornatusB, P. Magnificus and Thor amboinensis, associated with sea anemones in the shallow water of the Uwa Sea, Ehime, Japan. For the latter two species, we failed to get detailed data bata because of their low population density. In this report, we outline the study on P. Ornatus. Shrimps of this species on about 110 host anemones in a 20 x 60 m quadrat were censored monthly for 16 months and censused every 10 days during the season of settlement (August-November). Since this species dwelled only on a disc and tentacles of a host anemone and never migrated between hosts, even the earliest young after the planktonic stage could be counted quantitatively and the recognition of individual shrimps was generally possible without tagging or marking.The results we obtained were concerned with (1) process of settlement (the survival of recruits, the affection by residents on the number of recruits, the effect of host size on settlement, and the seasonal change of settlement), (2) survival rate (the affection by residents on the survival rate, an the survival curve), (3) growth and maturation (the differences in growth rate between the sexes, and the speed of maturation in relation to water temperatures, (4) breeding system (the stability of monogamous pair), (5) process of reproduction (the spawning interval, clutch size in relation to body size of females, and the incubation period in relation to water temperature, and (6) net reproductive rate. We are preparing to publish these results.