Physiological and ecological study on deep-sea zooplankton

深海浮游动物生理生态研究

基本信息

批准号：
14209001
负责人：
IKEDA Tsutomu
金额：
$ 30.53万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14209001/
关键词：
Zooplankton meso bathypelagic zones Life history metabolic activity RNA DNA ratio

项目摘要

This study was undertaken to fill the gap of our knowledge about physiological and ecological characteristics of meso/macro zooplankton in mesopelagic and bathypelagic zones of the Oyashio region, western subartic Pacific. Seasonal samplings with vertical closing nets were made down to 3000m to elucidate vertical distribution and life cycle patterns of dominant zooplankton taxa. Live specimens were retrieved for measuring oxygen consumption rates and enzyme assay of electron-transfer-system (ETS). Nucleic acids (RNA, DNA) were determined as an index of nutritional and growth conditions of various zooplankton. The outcome of the study can be summarized as follows ;1.Life cycle modes of representative species of numerically dominant mesozooplankto taxon (ostracods, poecilostomatoid copepods) in the meso/bathypelagic zones were characterized by year-round reproduction and long generation times (1-2 years). Some of them exhibited an ontogenetic vertical migration pattern (upward migration at younger stages). Life-cycles of interzonal large grazing copepods which have diapause phase in meso/bathypelagic zones were fully evaluated. Most of the results were published.2.Oxygen consumption rates of meso/bathypelagic zooplankton (largely copepods) were typically one-half the rates of epipelagic counterparts (note : the effects of temperature and body mass were all removed in this comparison). Of interzonal copepods, oxygen consumption rates of the specimens in diapause were shown to be as low as 30% of the rates at active feeding. The conclusion was further supported by the results of ETS assay. Part of the results was published.3.As judged by RNA/DNA ratios, nutritional/growth conditions of meso/bathypelagic copepods appeared to be less optimal as compared with epipelagic counterparts (note : the effect of body mass was removed, but the effect of temperature could not be removed at present because of the lack of information). Most of the results are to be published.

这项研究是为了填补我们对中西部太平洋Oyashio地区介质和浴类区域中介质/宏观浮游生物的生理和生态特征的知识的空白。带有垂直闭合网的季节性采样降低到3000m，以阐明主要浮游动物分类群的垂直分布和生命周期模式。检索了实时标本，用于测量电子转移系统（ETS）的氧消耗率和酶测定。核酸（RNA，DNA）被确定为各种浮游动物的营养和生长条件指数。该研究的结果可以总结如下：1。中含量/沐浴型区域中数值主导的中佐比分类单元（Ostracods，Poecilostomostoid copepods）的代表性物种的生命周期模式以全年生殖和长期生成时间（1-2年的时间）表征。其中一些表现出个体发生的垂直迁移模式（在年轻阶段向上迁移）。在中期间隔中有分区间较大放牧的co脚的生命周期，这些copepods在中索/巴特类区域中具有滞育相位。大多数结果都发表了。2.中/巴达拉式浮游生物的氧消耗率通常是表皮同伴的速率的一半（注意：在此比较中，温度和体重的影响都消除了）。在分区间的copods中，滞育标本的氧气消耗速率显示为活跃喂养时速率的30％。 ETS分析的结果进一步支持了结论。结果的一部分发表了。3。根据RNA/DNA比的判断，中含中/巴达拉舞的营养/生长条件似乎比表皮同伴相比似乎不太最佳（注意：消除体重的效果，但由于缺乏信息，因此无法消除温度的效果）。大多数结果将被发布。