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Feeding of zoopalnkton and micronekton in the deepsea ecosystem

深海生态系统中浮游动物和微游动物的摄食

基本信息

批准号：
06839008
负责人：
TERAZAKI Makoto
金额：
$ 1.34万
依托单位：
OCEAN RESEACH INSTITUTE,UNIVERSITY OF TOYOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06839008/
关键词：
deep-sea ecology benthopelagic zooplankton micronekton feeding SI Sagami Bay 海洋プランクトン

项目摘要

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.

1)利用新研制的深海拖曳系统的多浮游生物采样器（DTMPS），在日本相模湾进行了深海底栖生物的采集。拖船在地形允许的情况下尽可能靠近海底，保持离海底0.5- 3.0米的距离。该采样器有效收集了足以估计其生物量的底栖海洋生物。包括大型浮游生物（> 2厘米）在内的深海生物量为4.0- 43.3克/1000立方米，不包括大型浮游生物的生物量为4.0- 22.6克/1000立方米。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。假设底栖生物量不随区域或季节发生实质性变化，则底栖生物量占表面生物量的百分比约为5%至30%，相模湾的平均值为15%。2）<15>从相模湾收集的微浮游生物的Δ ^ N值范围为9.4至14.2@91。微<15>纳米粒子的^ N值。在91 ℃时，雌雄桡足类的C/N值随生长而增加（9.4 ~ 12.6），雌雄桡足类在性反转前的食物种类似乎不同。3）中、深潜桡足类的C/N值在任何季节和地区都几乎是恒定的，没有垂直迁移。但随着深度的增加，具有明显个体迁移特征的新赤杨的这一比例逐渐降低。在扫描电镜下观察到许多由粪粒引起的浮游植物碎片。