Feeding of zoopalnkton and micronekton in the deepsea ecosystem

1)利用新研制的多浮游生物采样器(DTMPS)对日本相模湾深海底栖生物进行了采集。在地形允许的情况下，拖缆尽量靠近海底，保持与海底以上0.5-3.0米的距离。这种采样器有效地采集了海底生物，足以估计它们的生物量。底栖生物量，包括巨型浮游生物(~gt；2 cm)，在4.0~43.3g/1000m~3之间，不包括巨型浮游生物在4.0~22.6g/1000m~3之间。生物量随深度呈指数下降，但与中上层生物量的斜率明显不同。假设底层生物量不因区域或季节而发生实质性变化，则底层生物量占表层生物量的百分比约为5%至30%，佐贺米湾平均为15%。2)从相阿米湾采集的微克隆值在9.4至14.2@91之间。微克吨的^&lt；15&>N值。Gagostoma gracile，随着生长(9.4-12.6@91)而增加，似乎在性别反转之前，雄性和雌性具有不同的食物组织。3)没有垂直迁徙的中、半性桡足类的C/N比在任何季节和地区几乎是恒定的。但这一比例显示出显著的个体发育迁移，并随着深度的增加而降低。扫描电子显微镜观察发现，有许多浮游植物碎片是由粪便颗粒引起的。

1) Collections were made of deep sea benthopelagic organisms in the Sagami Bay, Japan using a newly-develope multiple plankton sampler (DTMPS) attacged to the deep tow system. Tows were made as close to the sea floor as the terrain would allow, maintaining a distance of 0.5-3.0m above the bottom. Benthopelagic organisms were effectively collected by this sampler enough to estimate their biomass. Benthopelagic biomass, including megaplankton (> 2cm), ranged from 4.0-43.3g/1000m^3 and excluding megaplankton 4.0-22.6g/1000m^3. Biomass decreased exponentially with depth but showed a clearly different slope than that of pelagic biomass. Assuming that the benthopelagic biomass does not change substantially by area or season, the percentage of benthopelagic biomass to surface biomass ranged from about 5 to 30 %, with an average of 15 % in Sagami Bay.2) The delta^<15>N valus of micronekton collected from Sagami Bay ranges from 9.4 to 14.2 @91. The ^<15>N values of the micronekton. Gonostoma gracile, increased with growth (9.4 to 12.6 @91) and it seems that males, before sex reversal, and females cinsume different food organisms.3) The C/N ratio of meso- and bathypelgic copepods which did not the vertical migration, is almost constant at any season and area. But this ratio of Neocalnus cristatus which was shown remarkable ontogenetic migration, decreased with depth. Many fragments of phytoplankton which were caused by fecal pellet, were recognized under SEM observation.