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日本爱媛Uwa海浅水中与海葵相关的三种对虾Periclimenes ornatusB、P. Magnificus和Thor amboinensis的生活史和社会组织。对于后两个物种，由于其种群密度低，我们未能获得详细的数据数据。本文主要介绍了对蛇麻属植物的研究概况。在20 × 60 m样方中，以110只海葵为寄主，每月捕虾16个月，在定居季节（8 - 11月）每10天捕虾一次。由于这一物种只居住在宿主海葵的盘状和触手上，从未在宿主之间迁移，因此即使是浮游生物阶段之后最早的幼虾也可以被定量地计算出来，而且通常不需要标记或标记就可以识别单个虾。研究结果涉及：(1)沉降过程（幼虫存活率、居民对幼虫数量的影响、寄主大小对幼虫沉降的影响、幼虫沉降的季节变化）、(2)存活率（居民对幼虫存活率的影响、存活曲线）、(3)生长和成熟（两性生长速率差异、成熟速度与水温的关系）。(4)繁殖系统（一夫一妻制的稳定性）；(5)繁殖过程（产卵间隔、产卵数与雌鱼体型的关系、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.