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

本研究的初衷是比较日本爱媛UWA海浅水中与海葵相关的3种副线虫的生活史和社会组织。对于后两个物种，由于其种群密度较低，我们无法获得详细的数据。在这份报告中，我们概述了对Ornatus的研究。在一个20×60米的样方中，该物种在大约110个寄主海葵上进行了16个月的每月审查，并在定居季节(8-11月)每10天进行一次普查。由于该物种只栖息在寄主海葵的盘状和触须上，从不在寄主之间迁徙，因此即使是浮游期后最早的幼虾也可以被定量计算，并且一般可以在没有标记或标记的情况下识别单个虾。我们得到的结果涉及(1)定居过程(新兵的存活，居民对新兵数量的影响，宿主大小对定居的影响，以及定居的季节变化)，(2)存活率(居民对存活率的影响，生存曲线)，(3)生长和成熟(性别之间的生长速度差异，成熟速度与水温的关系，(4)繁殖系统(单配对的稳定性)，(5)繁殖过程(产卵间隔，雌鱼产卵大小与身体大小的关系，孵化期与水温的关系，以及(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.