Nutritional Condition of a shallow-water vestimentiferan tube-worm

为了解鹿儿岛湾80~100m浅水浮游管虫的微分布和营养状况，作者利用深海潜水器新开2000号对鹿儿岛湾南半部管虫进行了野外观测。在一个大约100x200米的限制区域内，有几个大的和无数的小灌木丛一样的集合。为了了解田间生长情况，尝试了用蓝色染料对试管进行染色实验。然而，由于这片内湾田地沉积很厚，所以没有成功。(营养状况)通过常规水质分析，在公共水族馆饲养的管虫标本中检测到硫化氢的吸收。为了阐明该物种的自然营养状况，我们分析了该物种的硫同位素组成。在野外，与其他深海热液喷口系统(0-5)相比，喷出的火山气含有相当重的硫化物(34S三角洲为千分之17)。鹿儿岛湾的管虫的身体是由非常轻的硫化物(-30)组成的。管虫使用的硫化氢的生产过程很可能在鹿儿岛湾是独一无二的，与其他深海喷口系统不同。

Lamellibrachia satsuma, a shallow water vestimentiferan tube-worm, living in Kagoshima Bay at depths of 80-100 m was studied to elucidate its micro-distribution and nutritional condition.(Field observation) The southern half of tube-worm site was observed using the deep-sea submersible Shinkai 2000 by the first author. There were a few large and numerous small bush-like assemblages in a restricted area of about 100 x 200 meters. To know the growth in the field, a staining experiment of tubes using a blue dye was tried. It was, however not successful because of thick sedimentation of this inner bay field.(Nutritional condition) The uptake of hydrogen sulfide was detected in rearing tube-worm specimens in a public aquarium by a routine water-quality analysis. To elucidate the natural nutritional condition of the species, we analyze the sulfur isotopic components. In the field, the emitted volcanic gas contains rather heavy sulfide (+17 per thousand in delta 34S) compared with other deep-sea hydro-thermal vent systems (0 to +5). The body of tube-worms from Kagoshima Bay, however was composed by very light sulfide (-30). It is highly possible that the production process of hydrogen sulfide used by tube-worms may be unique in Kagoshima Bay and not same as in other deep-sea vent systems.